Sample records for high-mass resonances decaying

  1. Search for high mass resonances decaying to muon pairs in ?s=1.96 TeV pp collisions.

    PubMed

    Aaltonen, T; Alvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, J A; Apresyan, A; Arisawa, T; Artikov, A; Asaadi, J; Ashmanskas, W; Auerbach, B; Aurisano, A; Azfar, F; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Barria, P; Bartos, P; Bauce, M; Bauer, G; Bedeschi, F; Beecher, D; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Bland, K R; Blumenfeld, B; Bocci, A; Bodek, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Brigliadori, L; Brisuda, A; Bromberg, C; Brucken, E; Bucciantonio, M; Budagov, J; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Calancha, C; Camarda, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Chung, W H; Chung, Y S; Ciobanu, C I; Ciocci, M A; Clark, A; Compostella, G; Convery, M E; Conway, J; Corbo, M; Cordelli, M; Cox, C A; Cox, D J; Cranmer, K; Crescioli, F; Cuenca Almenar, C; Cuevas, J; Culbertson, R; Dagenhart, D; d'Ascenzo, N; Datta, M; de Barbaro, P; De Cecco, S; De Lorenzo, G; Dell'Orso, M; Deluca, C; Demortier, L; Deng, J; Deninno, M; Devoto, F; d'Errico, M; Di Canto, A; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Dorigo, M; Dorigo, T; Ebina, K; Elagin, A; Eppig, A; Erbacher, R; Errede, D; Errede, S; Ershaidat, N; Eusebi, R; Fang, H C; Farrington, S; Feindt, M; Fernandez, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Frank, M J; Franklin, M; Freeman, J C; Funakoshi, Y; Furic, I; Gallinaro, M; Galyardt, J; Garcia, J E; Garfinkel, A F; Garosi, P; Gerberich, H; Gerchtein, E; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Ginsburg, C M; Giokaris, N; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldin, D; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Group, R C; Guimaraes da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, S R; Halkiadakis, E; Hamaguchi, A; Han, J Y; Happacher, F; Hara, K; Hare, D; Hare, M; Harr, R F; Hatakeyama, K; Hays, C; Heck, M; Heinrich, J; Herndon, M; Hewamanage, S; Hidas, D; Hocker, A; Hopkins, W; Horn, D; Hou, S; Hughes, R E; Hurwitz, M; Husemann, U; Hussain, N; Hussein, M; Huston, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jang, D; Jayatilaka, B; Jeon, E J; Jha, M K; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Junk, T R; Kamon, T; Karchin, P E; Kato, Y; Ketchum, W; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, H W; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirby, M; Klimenko, S; Kondo, K; Kong, D J; Konigsberg, J; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Krumnack, N; Kruse, M; Krutelyov, V; Kuhr, T; Kurata, M; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, E; Lee, H S; Lee, J S; Lee, S W; Leo, S; Leone, S; Lewis, J D; Lin, C-J; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, C; Liu, Q; Liu, T; Lockwitz, S; Lockyer, N S; Loginov, A; Lucchesi, D; Lueck, J; Lujan, P; Lukens, P; Lungu, G; Lys, J; Lysak, R; Madrak, R; Maeshima, K; Makhoul, K; Maksimovic, P; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Martínez, M; Martínez-Ballarín, R; Mastrandrea, P; Mathis, M; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzione, A; Mesropian, C; Miao, T; Mietlicki, D; Mitra, A; Miyake, H; Moed, S; Moggi, N; Mondragon, M N; Moon, C S; Moore, R; Morello, M J; Morlock, J; Movilla Fernandez, P; Mukherjee, A; Muller, Th; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Naganoma, J; Nakano, I; Napier, A; Nett, J; Neu, C; Neubauer, M S; Nielsen, J; Nodulman, L; Norniella, O; Nurse, E; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Ortolan, L; Pagan Griso, S; Pagliarone, C; Palencia, E; Papadimitriou, V; Paramonov, A A; Patrick, J; Pauletta, G; Paulini, M; Paus, C; Pellett, D E; Penzo, A; Phillips, T J; Piacentino, G; Pianori, E; Pilot, J; Pitts, K; Plager, C; Pondrom, L; Potamianos, K; Poukhov, O; Prokoshin, F; Pronko, A; Ptohos, F; Pueschel, E; Punzi, G; Pursley, J; Quinlan, E; Rahaman, A; Ramakrishnan, V; Ranjan, N; Redondo, I; Renton, P; Rescigno, M; Rimondi, F; Ristori, L; Robson, A; Rodrigo, T; Rodriguez, T; Rogers, E; Rolli, S; Roser, R; Rossi, M; Rubbo, F; Ruffini, F; Ruiz, A; Russ, J; Rusu, V; Safonov, A; Sakumoto, W K; Sakurai, Y; Santi, L; Sartori, L; Sato, K; Saveliev, V; Savoy-Navarro, A; Schlabach, P; Schmidt, A; Schmidt, E E

    2011-03-25

    We present a search for a new narrow, spin-1, high mass resonance decaying to ?(+)??+X, using a matrix-element-based likelihood and a simultaneous measurement of the resonance mass and production rate. In data with 4.6 fb?¹ of integrated luminosity collected by the CDF detector in pp collisions at ?s=1960 GeV, the most likely signal cross section is consistent with zero at 16% confidence level. We therefore do not observe evidence for a high mass resonance and place limits on models predicting spin-1 resonances, including M>1071 GeV/c² at 95% confidence level for a Z' boson with the same couplings to fermions as the Z boson. PMID:21517299

  2. A search for high-mass resonances decaying to ?[superscript +]?[superscript ?] in pp collisions at ?s = 7 TeV with the ATLAS detector

    E-print Network

    Taylor, Frank E.

    This Letter presents a search for high-mass resonances decaying into ?[superscript +]?[superscript ?] final states using proton–proton collisions at ?s = 7 TeV produced by the Large Hadron Collider. The data were recorded ...

  3. Search for narrow high-mass resonances in radiative decays of the Z0

    Microsoft Academic Search

    B. Adeva; O. Adriani; M. Aguilar-Benitez; H. Akbari; J. Alcaraz; A. Aloisio; G. Alverson; M. G. Alviggi; Q. An; H. Anderhub; A. L. Anderson; V. P. Andreev; T. Angelov; L. Antonov; D. Antreasyan; P. Arce; A. Arefiev; T. Azemoon; T. Aziz; P. V. K. S. Baba; P. Bagnaia; J. A. Bakken; L. Baksay; R. C. Ball; S. Banerjee; J. Bao; L. Barone; A. Bay; U. Becker; J. Behrens; S. Beingessner; Gy. L. Bencze; J. Berdugo; P. Berges; B. Bertucci; B. L. Betev; A. Biland; R. Bizzarri; J. J. Blaising; P. Blömeke; B. Blumenfeld; Gerjan J Bobbink; M. Bocciolini; R K Böck; A. Böhm; B. Borgia; D. Bourilkov; Maurice Bourquin; D. Boutigny; B T Bouwens; J. G. Branson; I. C. Brock; F. Bruyant; C. Buisson; A T Bujak; J. D. Burger; J. P. Burq; J K Busenitz; X. D. Cai; M. Capell; F. Carbonara; P. Cardenal; F. Carminati; A. M. Cartacci; M Cerrada-Canales; F. Cesaroni; Y. H. Chang; U. K. Chaturvedi; M. Chemarin; A. Chen; C. Chen; G. M. Chen; H. F. Chen; H. S. Chen; M. Chen; W. Y. Chen; G. Chiefari; C. Y. Chien; F. Chollet; C. Civinini; I. Clare; R. Clare; H. O. Cohn; G. Coignet; N. Colino; V. Commichau; G. Conforto; A. Contin; F. Crijns; X. Y. Cui; T. S. Dai; R. D'Alessandro; R. de Asmundis; A. Degré; K. Deiters; E. Dénes; P. Denes; F. Denotaristefani; M. Dhina; Daryl DiBitonto; M. Diemoz; F. Diez-Hedo; H. R. Dimitrov; C. Dionisi; R. Diviá; M. T. Dova; E. Drago; T. Driever; D Duschesneau; P. Duinker; I. Duran; H. El Mamouni; A. Engler; F. J. Eppling; F. C. Erné; Pierre Extermann; R. Fabbretti; G. Faber; M. Fabre; S. Falciano; Q. Fan; S. J. Fan; O. Fackler; J. Fay; J. Fehlmann; T. Ferguson; G. Fernandez; F. Ferroni; H S Fesefeldt; J. Field; Frank Filthaut; G. Finocchiaro; P. H. Fisher; G. Forconi; T. Foreman; Klaus Freudenreich; W. Friebel; M. Fukushima; M. Gailloud; Yu. Galaktionov; E. Gallo; S. N. Ganguli; P. Garcia-Abia; S. S. Gau; D. Gele; S. Gentile; M. Glaubman; S. Goldfarb; Z. F. Gong; E. Gonzalez; A. Gordeev; P. Göttlicher; D. Goujon; Giorgio Gratta; C. Grinnell; M. Gruenewald; M. Guanziroli; J. K. Guo; A. Gurtu; H. R. Gustafson; L. J. Gutay; H. Haan; A. Hasan; D. Hauschildt; C. F. He; T. Hebbeker; M. Hebert; G. Herten; U. Herten; A. Hervé; K. Hilgers; H. Hofer; H. Hoorani; L. S. Hsu; G. Hu; B. Ille; M. M. Ilyas; Vincenzo Innocente; E. Isiksal; H. Janssen; B. N. Jin; L. W. Jones; A. Kasser; R. A. Khan; Yu A Kamyshkov; Yu Karyotakis; M. Kaur; S. Khokhar; V. Khoze; M. N. Kienzle-Focacci; W W Kinnison; D. Kirkby; W. Kittel; A. Klimentov; A. C. König; O. Kornadt; V F Koutsenko; R. W. Kraemer; T. Kramer; V. R. Krastev; W. Krenz; J F Krizmanic; K. S. Kumar; V. Kumar; A. Kunin; V. Lalieu; G. Landi; K. Lanius; D. Lanske; S. Lanzano; P Lecomte; P. Lecomte; P. Lecoq; P. Le Coultre; D. Lee; I. Leedom; J. M. Le Goff; L. Leistam; R. Leiste; M. Lenti; E. Leonardi; J. Lettry; P. M. Levchenko; X. Leytens; C. Li; H. T. Li; J. F. Li; L. Li; P. J. Li; Q. Li; X. G. Li; J. Y. Liao; Z. Y. Lin; F. L. Linde; B. Lindemann; D. Linnhofer; R. Liu; Y. Liu; W. Lohmann; E. Longo; Y. S. Lu; J. M. Lubbers; K. Lübelsmeyer; C. Luci; D. Luckey; L. Ludovici; X. Lue; L. Luminari; W. G. Ma; M. MacDermott; R. Magahiz; M. Maire; P. K. Malhotra; R. Malik; A. Malinin; C. Maña; D. N. Mao; Y. F. Mao; M. Maolinbay; P. Marchesini; A. Marchionni; B. Martin; J. P. Martin; L. Martinez-Laso; F. Marzano; G. G. G. Massaro; T. Matsuda; K. Mazumdar; P. McBride; T. McMahon; D. McNally; Th. Meinholz; M. Merk; L. Merola; M. Meschini; W. J. Metzger; Y. Mi; G. B. Mills; Y. Mir; G. Mirabelli; J. Mnich; M. Möller; B. Monteleoni; G. Morand; R. Morand; S. Morganti; N. E. Moulai; R. Mount; S. Müller; E. Nagy; M. Napolitano; H. Newman; C. Neyer; M. A. Niaz; L. Niessen; H. Nowak; D. Pandoulas; F. Plasil; G Paternoster; S. Patricelli; Y. J. Pei; D. Perret-Gallix; J. Perrier; A. Pevsner; M. Pieri; P. A. Piroué; V. Plyaskin; M. Pohl; V. Pojidaev; N. Produit; J. M. Oian; K. N. Qureshi; R. Raghavan; G. Rahal-Callot; P. Razis; K. Read; D. Ren; Z. Ren; S. Reucroft; A. Ricker; O. Rind; C. Rippich; H. A. Rizvi; B. P. Roe; M. Röhner; S. Röhner; L. Romero; J. Rose; S. Rosier-Lees; R. Rosmalen; Ph. Rosselet; A. Rubbia; J. A. Rubio; M. Rubio; W. Ruckstuhl; H. Rykaczewski; M. Sachwitz; J. Salicio; G. Sanders; M. S. Sarakinos; G. Sartorelli; A. Savin; V. Schegelsky; K. Schmiemann; D. Schmitz; P. Schmitz; M. Schneegans; Herwig Franz Schopper; D. J. Schotanus; S. Shotkin; H. J. Schreiber; R. Schulte; S. Schulte; K. Schultze; J. Schütte; J. Schwenke; G. Schwering; C. Sciacca; I. Scott; R. Sehgal; P. G. Seiler; Johannes C Sens; I. Sheer; D. Z. Shen; V. Shevchenko; S. Shevchenko; X. R. Shi; K D Shmakov; V. Shoutko; E. Shumilov; N. Smirnov; E. Soderstrom; André Sopczak; C. Spartiotis; T. Spickermann; B. Spiess; P. Spillantini; R. Starosta; M. Steuer; D. P. Stickland; F. Stocozzi; W. Stoeffl; H. Stone; K. Strauch; B. C. Stringfellow; K. Sudhakar; G G Sultanov; R. L. Summer

    1991-01-01

    We search for new resonances, Y, with mass MY, in the range from 30 to 89 GeV, produced via the reaction e+e- --> Z0 -->gammaY, where Y subsequently decays into e+e-, mu+mu- or hadrons. We use 5.5.pb-1 of data collected in the energy range 88.2 <= sqrt(s) <= 94.2 GeV, near the Z0 peak. We obtain the following upper limits,

  4. Search for High-Mass Resonances Decaying to Dimuons at CDF

    SciTech Connect

    Aaltonen, T.; Maki, T.; Mehtala, P.; Orava, R.; Remortel, N. van [Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland); Adelman, J.; Brubaker, E.; Fedorko, W. T.; Grosso-Pilcher, C.; Kim, Y. K.; Krop, D.; Kwang, S.; Lee, H. S.; Paramonov, A. A.; Schmidt, M. A.; Shiraishi, S.; Shochet, M.; Wilbur, S.; Wolfe, C.; Yang, U. K. [Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)] (and others)

    2009-03-06

    We present a search for high-mass neutral resonances using dimuon data corresponding to an integrated luminosity of 2.3 fb{sup -1} collected in pp collisions at {radical}(s)=1.96 TeV by the CDF II detector at the Fermilab Tevatron. No significant excess above the standard model expectation is observed in the dimuon invariant-mass spectrum. We set 95% confidence level upper limits on {sigma}BR(pp{yields}X{yields}{mu}{mu}), where X is a boson with spin-0, 1, or 2. Using these cross section limits, we determine lower mass limits on sneutrinos in R-parity-violating supersymmetric models, Z{sup '} bosons, and Kaluza-Klein gravitons in the Randall-Sundrum model.

  5. Search for high-mass resonances decaying to dimuons at CDF.

    PubMed

    Aaltonen, T; Adelman, J; Akimoto, T; Alvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Apresyan, A; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Azzurri, P; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Bartsch, V; Bauer, G; Beauchemin, P-H; Bedeschi, F; Beecher, D; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Beringer, J; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bolla, G; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Bridgeman, A; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, J; Budd, H S; Budd, S; Burke, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Byrum, K L; Cabrera, S; Calancha, C; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Chwalek, T; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Compostella, G; Convery, M E; Conway, J; Cordelli, M; Cortiana, G; Cox, C A; Cox, D J; Crescioli, F; Cuenca Almenar, C; Cuevas, J; Culbertson, R; Cully, J C; Dagenhart, D; Datta, M; Davies, T; de Barbaro, P; De Cecco, S; Deisher, A; De Lorenzo, G; Dell'Orso, M; Deluca, C; Demortier, L; Deng, J; Deninno, M; Derwent, P F; di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Elagin, A; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, W T; Feild, R G; Feindt, M; Fernandez, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Frank, M J; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; Garberson, F; Garcia, J E; Garfinkel, A F; Genser, K; Gerberich, H; Gerdes, D; Gessler, A; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C M; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Grundler, U; Guimaraes da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, K; Hahn, S R; Halkiadakis, E; Han, B-Y; Han, J Y; Happacher, F; Hara, K; Hare, D; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hays, C; Heck, M; Heijboer, A; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hewamanage, S; Hidas, D; Hill, C S; Hirschbuehl, D; Hocker, A; Hou, S; Houlden, M; Hsu, S-C; Huffman, B T; Hughes, R E; Husemann, U; Hussein, M; Husemann, U; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jayatilaka, B; Jeon, E J; Jha, M K; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Kar, D; Karchin, P E; Kato, Y; Kephart, R; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, H W; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Knuteson, B; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhr, T; Kulkarni, N P; Kurata, M; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, E; Lee, H S; Lee, S W; Leone, S; Lewis, J D; Lin, C-S; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, C; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Lovas, L; Lucchesi, D; Luci, C; Lueck, J; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; MacQueen, D; Madrak, R; Maeshima, K; Makhoul, K; Maki, T; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Marino, C P; Martin, A; Martin, V; Martínez, M; Martínez-Ballarín, R; Maruyama, T; Mastrandrea, P; Masubuchi, T; Mathis, M; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzione, A; Merkel, P; Mesropian, C; Miao, T; Miladinovic, N; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyake, H; Moggi, N; Moon, C S; Moore, R; Morello, M J; Morlok, J; Movilla Fernandez, P; Mülmenstädt, J; Mukherjee, A; Muller, Th; Mumford, R; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Nagano, A; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Necula, V; Nett, J; Neu, C; Neubauer, M S; Neubauer, S; Nielsen, J; Nodulman, L; Norman, M; Norniella, O; Nurse, E; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Pagan Griso, S; Palencia, E; Papadimitriou, V; Papaikonomou, A; Paramonov, A A; Parks, B; Pashapour, S; Patrick, J

    2009-03-01

    We present a search for high-mass neutral resonances using dimuon data corresponding to an integrated luminosity of 2.3 fb(-1) collected in pp[over ] collisions at sqrt[s]=1.96 TeV by the CDF II detector at the Fermilab Tevatron. No significant excess above the standard model expectation is observed in the dimuon invariant-mass spectrum. We set 95% confidence level upper limits on sigmaBR(pp-->X-->micromicro), where X is a boson with spin-0, 1, or 2. Using these cross section limits, we determine lower mass limits on sneutrinos in R-parity-violating supersymmetric models, Z' bosons, and Kaluza-Klein gravitons in the Randall-Sundrum model. PMID:19392510

  6. Search for high-mass resonances decaying to dilepton final states in pp collisions at ?s =7 TeV with the ATLAS detector

    E-print Network

    Taylor, Frank E.

    The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying to an electron-positron pair or a muon-antimuon pair. The search is sensitive to heavy neutral Z? gauge bosons, Randall-Sundrum ...

  7. Search for high-mass resonances decaying into ZZ in p$\\bar{p}$ collisions at $\\sqrt{s}=1.96$\\,TeV

    E-print Network

    CDF Collaboration; T. Aaltonen; B. Alvarez Gonzalez; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; D. Bisello; I. Bizjak; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; A. Buzatu; A. Calamba; C. Calancha; S. Camarda; M. Campanelli; M. Campbell; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; S. Carron; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; M. Cavalli-Sforza; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; F. Chlebana; K. Cho; D. Chokheli; W. H. Chung; Y. S. Chung; M. A. Ciocci; A. Clark; C. Clarke; G. Compostella; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; F. Crescioli; J. Cuevas; R. Culbertson; D. Dagenhart; N. d'Ascenzo; M. Datta; P. de Barbaro; M. Dell'Orso; L. Demortier; M. Deninno; F. Devoto; M. d'Errico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; P. Dong; M. Dorigo; T. Dorigo; K. Ebina; A. Elagin; A. Eppig; R. Erbacher; S. Errede; N. Ershaidat; R. Eusebi; S. Farrington; M. Feindt; J. P. Fernandez; R. Field; G. Flanagan; R. Forrest; M. J. Frank; M. Franklin; J. C. Freeman; Y. Funakoshi; I. Furic; M. Gallinaro; J. E. Garcia; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; P. Giannetti; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; N. Goldschmidt; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. González; I. Gorelov; A. T. Goshaw; K. Goulianos; S. Grinstein; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; E. Halkiadakis; A. Hamaguchi; J. Y. Han; F. Happacher; K. Hara; D. Hare; M. Hare; R. F. Harr; K. Hatakeyama; C. Hays; M. Heck; J. Heinrich; M. Herndon; S. Hewamanage; A. Hocker; W. Hopkins; D. Horn; S. Hou; R. E. Hughes; M. Hurwitz; U. Husemann; N. Hussain; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; V. Khotilovich; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; Y. J. Kim; N. Kimura; M. Kirby; S. Klimenko; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; D. Krop; M. Kruse; V. Krutelyov; T. Kuhr; M. Kurata; S. Kwang; A. T. Laasanen; S. Lami; S. Lammel; M. Lancaster; R. L. Lander; K. Lannon; A. Lath; G. Latino; T. LeCompte; E. Lee; H. S. Lee; J. S. Lee; S. W. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; C. -J. Lin; M. Lindgren; E. Lipeles; A. Lister; D. O. Litvintsev; C. Liu; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; K. Maeshima; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; C. Marino; M. Martinez; P. Mastrandrea; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; K. S. McFarland; P. McIntyre; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; M. N. Mondragon; C. S. Moon; R. Moore; M. J. Morello; J. Morlock; P. Movilla Fernandez; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; M. S. Neubauer; J. Nielsen; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; S. Pagan Griso; C. Pagliarone; E. Palencia; V. Papadimitriou; A. A. Paramonov; J. Patrick; G. Pauletta; M. Paulini; C. Paus; D. E. Pellett; A. Penzo; T. J. Phillips; G. Piacentino; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; F. Prokoshin; A. Pranko; F. Ptohos; G. Punzi; A. Rahaman; V. Ramakrishnan; N. Ranjan; I. Redondo; P. Renton; M. Rescigno; T. Riddick; F. Rimondi; L. Ristori; A. Robson; T. Rodrigo; T. Rodriguez; E. Rogers; S. Rolli; R. Roser; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; A. Safonov; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; A. Schmidt; E. E. Schmidt; T. Schwarz; L. Scodellaro; A. Scribano; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; P. Sinervo; K. Sliwa; J. R. Smith; F. D. Snider; A. Soha; V. Sorin; H. Song; P. Squillacioti; M. Stancari; R. St. Denis

    2011-11-15

    We search for high-mass resonances decaying into Z boson pairs using data corresponding to 6 fb^-1 collected by the CDF experiment in p\\bar{p} collisions at sqrt{s}=1.96 TeV. The search is performed in three distinct final states: ZZ --> l^+l^-l^+l^-, ZZ --> l^+l^-\

  8. Search for High Mass Resonances Decaying to Muon Pairs in root s=1.96 TeV p(p)over-bar Collisions

    Microsoft Academic Search

    T. Aaltonen; B. A. Gonzalez; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; A. Apresyan; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; G. Bauer; F. Bedeschi; D. Beecher; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; M. Binkley; D. Bisello; I. Bizjak; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; B. Brau; L. Brigliadori; A. Brisuda; C. Bromberg; E. Brucken; M. Bucciantonio; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; A. Buzatu; C. Calancha; S. Camarda; M. Campanelli; M. Campbell; F. Canelli; A. Canepa; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; S. Carron; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; M. Cavalli-Sforza; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; F. Chlebana; K. Cho; D. Chokheli; J. P. Chou; W. H. Chung; Y. S. Chung; C. I. Ciobanu; M. A. Ciocci; A. Clark; G. Compostella; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; K. Cranmer; F. Crescioli; C. C. Almenar; J. Cuevas; R. Culbertson; D. Dagenhart; N. dAscenzo; M. Datta; P. de Barbaro; S. De Cecco; G. De Lorenzo; M. DellOrso; C. Deluca; L. Demortier; J. Deng; M. Deninno; F. Devoto; M. dErrico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. DOnofrio; S. Donati; P. Dong; M. Dorigo; T. Dorigo; K. Ebina; A. Elagin; A. Eppig; R. Erbacher; D. Errede; S. Errede; N. Ershaidat; R. Eusebi; H. C. Fang; S. Farrington; M. Feindt; J. P. Fernandez; C. Ferrazza; R. Field; G. Flanagan; R. Forrest; M. J. Frank; M. Franklin; J. C. Freeman; Y. Funakoshi; I. Furic; M. Gallinaro; J. Galyardt; J. E. Garcia; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; P. Giannetti; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; M. Giunta; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; N. Goldschmidt; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzalez; I. Gorelov; A. T. Goshaw; K. Goulianos; A. Gresele; S. Grinstein; C. Grosso-Pilcher; J. G. da Costa; Z. Gunay-Unalan; C. Haber; S. R. Hahn; E. Halkiadakis; A. Hamaguchi; J. Y. Han; F. Happacher; K. Hara; D. Hare; M. Hare; R. F. Harr; K. Hatakeyama; C. Hays; M. Heck; J. Heinrich; M. Herndon; S. Hewamanage; D. Hidas; A. Hocker; W. Hopkins; D. Horn; S. Hou; R. E. Hughes; M. Hurwitz; U. Husemann; N. Hussain; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; M. K. Jha; S. Jindariani; W. Johnson; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; T. Kamon; P. E. Karchin; Y. Kato; W. Ketchum; J. Keung; V. Khotilovich; B. Kilminster; D. H. Kim; H. S. Kim; H. W. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; N. Kimura; M. Kirby; S. Klimenko; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; D. Krop; N. Krumnack; M. Kruse; V. Krutelyov; T. Kuhr; M. Kurata; S. Kwang; A. T. Laasanen; S. Lami; S. Lammel; M. Lancaster; R. L. Lander; K. Lannon; A. Lath; G. Latino; I. Lazzizzera; T. LeCompte; E. Lee; H. S. Lee; J. S. Lee; S. W. Lee; S. Leo; S. Leone; J. D. Lewis; C. J. Lin; J. Linacre; M. Lindgren; E. Lipeles; A. Lister; D. O. Litvintsev; C. Liu; Q. Liu; T. Liu; S. Lockwitz; N. S. Lockyer; A. Loginov; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; K. Maeshima; K. Makhoul; P. Maksimovic; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; C. Marino; M. Martinez; R. Martinez-Ballarin; P. Mastrandrea; M. Mathis; M. E. Mattson; P. Mazzanti; K. S. McFarland; P. McIntyre; R. McNulty; A. Mehta; P. Mehtala; A. Menzione; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; M. N. Mondragon; C. S. Moon; R. Moore; M. J. Morello; J. Morlock; P. M. Fernandez; A. Mukherjee; T. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; M. S. Neubauer; J. Nielsen; L. Nodulman; O. Norniella; E. Nurse; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; S. P. Griso; C. Pagliarone; E. Palencia; V. Papadimitriou; A. A. Paramonov; J. Patrick; G. Pauletta; M. Paulini; C. Paus; D. E. Pellett; A. Penzo; T. J. Phillips; G. Piacentino; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; K. Potamianos; O. Poukhov; F. Prokoshin; A. Pronko; F. Ptohos; E. Pueschel; G. Punzi; J. Pursley; E. Quinlan; A. Rahaman; V. Ramakrishnan; N. Ranjan; I. Redondo; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodrigo; T. Rodriguez; E. Rogers; S. Rolli; R. Roser; M. Rossi; F. Rubbo; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; A. Safonov; W. K. Sakumoto; Y. Sakurai; L. Santi; L. Sartori; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; A. Schmidt

    2011-01-01

    We present a search for a new narrow, spin-1, high mass resonance decaying to mu(+)mu(-) + X, using a matrix-element-based likelihood and a simultaneous measurement of the resonance mass and production rate. In data with 4.6 fb(-1) of integrated luminosity collected by the CDF detector in p (p) over bar collisions at root s = 1960 GeV, the most likely

  9. Search for High Mass Resonances Decaying to Muon Pairs in {radical}(s)=1.96 TeV pp Collisions

    SciTech Connect

    Aaltonen, T.; Brucken, E.; Devoto, F.; Mehtala, P.; Orava, R. [Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland); Alvarez Gonzalez, B.; Casal, B.; Cuevas, J.; Gomez, G.; Palencia, E.; Rodrigo, T.; Ruiz, A.; Scodellaro, L.; Vila, I.; Vilar, R.; Vizan, J. [Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander (Spain); Amerio, S.; Dorigo, T.; Gresele, A.; Lazzizzera, I. [Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova (Italy)

    2011-03-25

    We present a search for a new narrow, spin-1, high mass resonance decaying to {mu}{sup +}{mu}{sup -}+X, using a matrix-element-based likelihood and a simultaneous measurement of the resonance mass and production rate. In data with 4.6 fb{sup -1} of integrated luminosity collected by the CDF detector in pp collisions at {radical}(s)=1960 GeV, the most likely signal cross section is consistent with zero at 16% confidence level. We therefore do not observe evidence for a high mass resonance and place limits on models predicting spin-1 resonances, including M>1071 GeV/c{sup 2} at 95% confidence level for a Z{sup '} boson with the same couplings to fermions as the Z boson.

  10. Search for high-mass resonances decaying into $ZZ$ in p$\\bar{p}$ collisions at $\\sqrt{s}=1.96$\\,TeV

    SciTech Connect

    Aaltonen, T.; /Helsinki Inst. of Phys.; Alvarez Gonzalez, B.; /Oviedo U. /Cantabria Inst. of Phys.; Amerio, S.; /INFN, Padua; Amidei, D.; /Michigan U.; Anastassov, A.; /Northwestern U. /Fermilab; Annovi, A.; /Frascati; Antos, J.; /Comenius U.; Apollinari, G.; /Fermilab; Appel, J.A.; /Fermilab; Arisawa, T.; /Waseda U.; Artikov, A.; /Dubna, JINR /Texas A-M

    2011-11-01

    The authors search for high-mass resonances decaying into Z boson pairs using data corresponding to 6 fb{sup -1} collected by the CDF experiment in p{bar p} collisions at {radical}s = 1.96 TeV. The search is performed in three distinct final states: ZZ {yields} {ell}{sup +}{ell}{sup -}{ell}{sup +}{ell}{sup -}, ZZ {yields} {ell}{sup +}{ell}{sup -}{nu}{nu}, and ZZ {yields} {ell}{sup +}{ell}{sup -}jj. For a Randall-Sundrum graviton G*, the 95% CL upper limits on the production cross section times branching ratio to ZZ, {sigma}(p{bar p} {yields} G* {yields} ZZ), vary between 0.26 pb and 0.045 pb in the mass range 300 < M{sub G*} < 1000 GeV/c{sup 2}.

  11. Search for High-Mass Resonances Decaying into Leptons of Different Flavor (e mu, e tau, mu tau) in p anti-p Collisions at sqrt(s) = 1.96 TeV

    SciTech Connect

    Tu, Yanjun; /Pennsylvania U.

    2008-10-01

    We present a search for high-mass resonances decaying into two leptons of different flavor: e{mu}, e{tau}, and {mu}{tau}. These resonances are predicted by several models beyond the standard model, such as the R-parity-violating MSSM. The search is based on 1 fb{sup -1} of data collected at the Collider Detector at Fermilab (CDF II) in proton anti-proton collisions. Our observations are consistent with the standard model expectations. The results are interpreted to set 95% C.L. upper limits on {sigma} x BR of {tilde {nu}}{sub {tau}} {yields} e{mu}, e{tau}, {mu}{tau}.

  12. On the weak decays of high-mass hadrons

    Microsoft Academic Search

    Jonathan Richard Ellis; Mary Katherin Gaillard; Dimitri V Nanopoulos

    1975-01-01

    Several arguments for the dominance of certain types of non-leptonic weak decays of strange particles are examined for their applicability to high-mass hadrons. Arguments based on asymptotic freedom, duality, current algebra and PCAC, and coloured fermion quarks are all found to be weaker than for strange decays. Specific calculations in the Glashow-Iliopoulos-Maiani charm scheme yield total semi-leptonic decay rates of

  13. Highly Mass-Sensitive Thin Film Plate Acoustic Resonators (FPAR)

    PubMed Central

    Arapan, Lilia; Alexieva, Gergana; Avramov, Ivan D.; Radeva, Ekaterina; Strashilov, Vesseline; Katardjiev, Ilia; Yantchev, Ventsislav

    2011-01-01

    The mass sensitivity of thin aluminum nitride (AlN) film S0 Lamb wave resonators is theoretically and experimentally studied. Theoretical predictions based on modal and finite elements method analysis are experimentally verified. Here, two-port 888 MHz synchronous FPARs are micromachined and subsequently coated with hexamethyl-disiloxane(HMDSO)-plasma-polymerized thin films of various thicknesses. Systematic data on frequency shift and insertion loss versus film thickness are presented. FPARs demonstrate high mass-loading sensitivity as well as good tolerance towards the HMDSO viscous losses. Initial measurements in gas phase environment are further presented. PMID:22163994

  14. Highly mass-sensitive thin film plate acoustic resonators (FPAR).

    PubMed

    Arapan, Lilia; Alexieva, Gergana; Avramov, Ivan D; Radeva, Ekaterina; Strashilov, Vesseline; Katardjiev, Ilia; Yantchev, Ventsislav

    2011-01-01

    The mass sensitivity of thin aluminum nitride (AlN) film S0 Lamb wave resonators is theoretically and experimentally studied. Theoretical predictions based on modal and finite elements method analysis are experimentally verified. Here, two-port 888 MHz synchronous FPARs are micromachined and subsequently coated with hexamethyl-disiloxane(HMDSO)-plasma-polymerized thin films of various thicknesses. Systematic data on frequency shift and insertion loss versus film thickness are presented. FPARs demonstrate high mass-loading sensitivity as well as good tolerance towards the HMDSO viscous losses. Initial measurements in gas phase environment are further presented. PMID:22163994

  15. Search for high mass dilepton resonances in pp collisions at ?s = 7 TeV with the ATLAS experiment

    E-print Network

    Taylor, Frank E.

    This Letter presents a search for high mass e[superscript +]e[superscript ?] or ?[superscript +]?[superscript ?] resonances in pp collisions at ?s = 7 TeV at the LHC. The data were recorded by the ATLAS experiment during ...

  16. Resonance structure of ?--->K-?+?-?? decays

    NASA Astrophysics Data System (ADS)

    Asner, D. M.; Eppich, A.; Gronberg, J.; Hill, T. S.; Lange, D. J.; Morrison, R. J.; Briere, R. A.; Behrens, B. H.; Ford, W. T.; Gritsan, A.; Roy, J.; Smith, J. G.; Alexander, J. P.; Baker, R.; Bebek, C.; Berger, B. E.; Berkelman, K.; Blanc, F.; Boisvert, V.; Cassel, D. G.; Dickson, M.; Drell, P. S.; Ecklund, K. M.; Ehrlich, R.; Foland, A. D.; Gaidarev, P.; Galik, R. S.; Gibbons, L.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hopman, P. I.; Jones, C. D.; Kreinick, D. L.; Lohner, M.; Magerkurth, A.; Meyer, T. O.; Mistry, N. B.; Ng, C. R.; Nordberg, E.; Patterson, J. R.; Peterson, D.; Riley, D.; Thayer, J. G.; Thies, P. G.; Valant-Spaight, B.; Warburton, A.; Avery, P.; Prescott, C.; Rubiera, A. I.; Yelton, J.; Zheng, J.; Brandenburg, G.; Ershov, A.; Gao, Y. S.; Kim, D. Y.-J.; Wilson, R.; Browder, T. E.; Li, Y.; Rodriguez, J. L.; Yamamoto, H.; Bergfeld, T.; Eisenstein, B. I.; Ernst, J.; Gladding, G. E.; Gollin, G. D.; Hans, R. M.; Johnson, E.; Karliner, I.; Marsh, M. A.; Palmer, M.; Plager, C.; Sedlack, C.; Selen, M.; Thaler, J. J.; Williams, J.; Edwards, K. W.; Janicek, R.; Patel, P. M.; Sadoff, A. J.; Ammar, R.; Bean, A.; Besson, D.; Davis, R.; Kravchenko, I.; Kwak, N.; Zhao, X.; Anderson, S.; Frolov, V. V.; Kubota, Y.; Lee, S. J.; Mahapatra, R.; O'neill, J. J.; Poling, R.; Riehle, T.; Smith, A.; Urheim, J.; Ahmed, S.; Alam, M. S.; Athar, S. B.; Jian, L.; Ling, L.; Mahmood, A. H.; Saleem, M.; Timm, S.; Wappler, F.; Anastassov, A.; Duboscq, J. E.; Gan, K. K.; Gwon, C.; Hart, T.; Honscheid, K.; Hufnagel, D.; Kagan, H.; Kass, R.; Pedlar, T. K.; Schwarthoff, H.; Thayer, J. B.; von Toerne, E.; Zoeller, M. M.; Richichi, S. J.; Severini, H.; Skubic, P.; Undrus, A.; Chen, S.; Fast, J.; Hinson, J. W.; Lee, J.; Menon, N.; Miller, D. H.; Shibata, E. I.; Shipsey, I. P.; Pavlunin, V.; Cronin-Hennessy, D.; Kwon, Y.; Lyon, A. L.; Thorndike, E. H.; Jessop, C. P.; Marsiske, H.; Perl, M. L.; Savinov, V.; Ugolini, D.; Zhou, X.; Coan, T. E.; Fadeyev, V.; Maravin, Y.; Narsky, I.; Stroynowski, R.; Ye, J.; Wlodek, T.; Artuso, M.; Ayad, R.; Boulahouache, C.; Bukin, K.; Dambasuren, E.; Karamov, S.; Kopp, S.; Majumder, G.; Moneti, G. C.; Mountain, R.; Schuh, S.; Skwarnicki, T.; Stone, S.; Viehhauser, G.; Wang, J. C.; Wolf, A.; Wu, J.; Csorna, S. E.; Danko, I.; McLean, K. W.; Márka, Sz.; Xu, Z.; Godang, R.; Kinoshita, K.; Lai, I. C.; Schrenk, S.; Bonvicini, G.; Cinabro, D.; Perera, L. P.; Zhou, G. J.; Eigen, G.; Lipeles, E.; Schmidtler, M.; Shapiro, A.; Sun, W. M.; Weinstein, A. J.; Würthwein, F.; Jaffe, D. E.; Masek, G.; Paar, H. P.; Potter, E. M.; Prell, S.; Sharma, V.

    2000-10-01

    Using a sample of 4.7 fb-1 integrated luminosity accumulated with the CLEO II detector at the Cornell Electron Storage Ring (CESR), we investigate the mass spectrum and resonant structure in ?--->K-?+?-?? decays. We measure the relative fractions of K1(1270) and K1(1400) resonances in these decays, as well as the K1 masses and widths. Our fitted K1 resonances are somewhat broader than previous hadroproduction measurements, and in agreement with recent CERN LEP results from tau decay. The larger central value of our measured width supports models which attribute the small ?--->K-?+?-?? branching fraction to larger K1 widths than are presently tabulated. We also determine the Ka-Kb mixing angle ?K.

  17. Ephemeris, orbital decay, and masses of ten eclipsing high-mass X-ray binaries

    NASA Astrophysics Data System (ADS)

    Falanga, M.; Bozzo, E.; Lutovinov, A.; Bonnet-Bidaud, J. M.; Fetisova, Y.; Puls, J.

    2015-05-01

    We update the ephemeris of the eclipsing high-mass X-ray binary (HMXB) systems LMC X-4, Cen X-3, 4U 1700-377, 4U 1538-522, SMC X-1, IGR J18027-2016, Vela X-1,IGR J17252-3616, XTE J1855-026, and OAO 1657-415 with the help of more than ten years of monitoring these sources with the All Sky Monitor onboard RXTE and with the Integral Soft Gamma-Ray Imager onboard INTEGRAL. These results are used to refine previous measurements of the orbital period decay of all sources (where available) and provide the first accurate values of the apsidal advance in Vela X-1 and 4U 1538-522. Updated values for the masses of the neutron stars hosted in the ten HMXBs are also provided, as well as the long-term light curves folded on the best determined orbital parameters of the sources. These light curves reveal complex eclipse ingresses and egresses that are understood mostly as being caused by accretion wakes. Our results constitute a database to be used for population and evolutionary studies of HMXBs and for theoretical modeling of long-term accretion in wind-fed X-ray binaries. Appendix A is available in electronic form at http://www.aanda.org

  18. Search for high-mass diphoton resonances in $pp$ collisions at $\\sqrt{s}=8$ TeV with the ATLAS detector

    E-print Network

    Aad, Georges; Abdallah, Jalal; Abdel Khalek, Samah; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Abreu, Ricardo; Abulaiti, Yiming; Acharya, Bobby Samir; Adamczyk, Leszek; Adams, David; Adelman, Jahred; Adomeit, Stefanie; Adye, Tim; Agatonovic-Jovin, Tatjana; Aguilar-Saavedra, Juan Antonio; Agustoni, Marco; Ahlen, Steven; Ahmadov, Faig; Aielli, Giulio; Akerstedt, Henrik; Åkesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Alberghi, Gian Luigi; Albert, Justin; Albrand, Solveig; Alconada Verzini, Maria Josefina; Aleksa, Martin; Aleksandrov, Igor; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Alimonti, Gianluca; Alio, Lion; Alison, John; Allbrooke, Benedict; Allison, Lee John; Allport, Phillip; Aloisio, Alberto; Alonso, Alejandro; Alonso, Francisco; Alpigiani, Cristiano; Altheimer, Andrew David; Alvarez Gonzalez, Barbara; Alviggi, Mariagrazia; Amako, Katsuya; Amaral Coutinho, Yara; Amelung, Christoph; Amidei, Dante; Amor Dos Santos, Susana Patricia; Amorim, Antonio; Amoroso, Simone; Amram, Nir; Amundsen, Glenn; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Anduaga, Xabier; Angelidakis, Stylianos; Angelozzi, Ivan; Anger, Philipp; Angerami, Aaron; Anghinolfi, Francis; Anisenkov, Alexey; Anjos, Nuno; Annovi, Alberto; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoki, Masato; Aperio Bella, Ludovica; Arabidze, Giorgi; Arai, Yasuo; Araque, Juan Pedro; Arce, Ayana; Arduh, Francisco Anuar; Arguin, Jean-Francois; Argyropoulos, Spyridon; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnal, Vanessa; Arnold, Hannah; Arratia, Miguel; Arslan, Ozan; Artamonov, Andrei; Artoni, Giacomo; Asai, Shoji; Asbah, Nedaa; Ashkenazi, Adi; Åsman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astalos, Robert; Atkinson, Markus; Atlay, Naim Bora; Auerbach, Benjamin; Augsten, Kamil; Aurousseau, Mathieu; Avolio, Giuseppe; Axen, Bradley; Ayoub, Mohamad Kassem; Azuelos, Georges; Baak, Max; Baas, Alessandra; Bacci, Cesare; Bachacou, Henri; Bachas, Konstantinos; Backes, Moritz; Backhaus, Malte; Bagiacchi, Paolo; Bagnaia, Paolo; Bai, Yu; Bain, Travis; Baines, John; Baker, Oliver Keith; Balek, Petr; Balestri, Thomas; Balli, Fabrice; Banas, Elzbieta; Banerjee, Swagato; Bannoura, Arwa A E; Bansil, Hardeep Singh; Barak, Liron; Baranov, Sergei; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnes, Sarah Louise; Barnett, Bruce; Barnett, Michael; Barnovska, Zuzana; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimarães da Costa, João; Bartoldus, Rainer; Barton, Adam Edward; Bartos, Pavol; Bassalat, Ahmed; Basye, Austin; Bates, Richard; Batista, Santiago Juan; Batley, Richard; Battaglia, Marco; Bauce, Matteo; Bauer, Florian; Bawa, Harinder Singh; Beacham, James Baker; Beattie, Michael David; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Becker, Anne Kathrin; Becker, Sebastian; Beckingham, Matthew; Becot, Cyril; Beddall, Andrew; Beddall, Ayda; Bednyakov, Vadim; Bee, Christopher; Beemster, Lars; Beermann, Thomas; Begel, Michael; Behr, Janna Katharina; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellerive, Alain; Bellomo, Massimiliano; Belotskiy, Konstantin; Beltramello, Olga; Benary, Odette; Benchekroun, Driss; Bender, Michael; Bendtz, Katarina; Benekos, Nektarios; Benhammou, Yan; Benhar Noccioli, Eleonora; Benitez Garcia, Jorge-Armando; Benjamin, Douglas; Bensinger, James; Bentvelsen, Stan; Beresford, Lydia; Beretta, Matteo; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Beringer, Jürg; Bernard, Clare; Bernard, Nathan Rogers; Bernius, Catrin; Bernlochner, Florian Urs; Berry, Tracey; Berta, Peter; Bertella, Claudia; Bertoli, Gabriele; Bertolucci, Federico; Bertsche, Carolyn; Bertsche, David; Besana, Maria Ilaria; Besjes, Geert-Jan; Bessidskaia Bylund, Olga; Bessner, Martin Florian; Besson, Nathalie; Betancourt, Christopher; Bethke, Siegfried; Bevan, Adrian John; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianchini, Louis; Bianco, Michele; Biebel, Otmar; Bieniek, Stephen Paul; Biglietti, Michela; Bilbao De Mendizabal, Javier; Bilokon, Halina; Bindi, Marcello; Binet, Sebastien; Bingul, Ahmet; Bini, Cesare; Black, Curtis

    2015-01-01

    This article describes a search for high-mass resonances decaying to a pair of photons using a sample of $20.3$ fb$^{-1}$ of $pp$ collisions at $\\sqrt{s}=8$ TeV recorded with the ATLAS detector at the Large Hadron Collider. The data are found to be in agreement with the Standard Model prediction, and limits are reported in the framework of the Randall-Sundrum model. This theory leads to the prediction of graviton states, the lightest of which could be observed at the Large Hadron Collider. A lower limit of $2.66$ ($1.41$) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of $k/\\overline{M}_{\\mathrm{Pl}} = 0.1$ ($0.01$).

  19. Broad resonances and beta-decay

    E-print Network

    Riisager, K; Hyldegaard, S; Jensen, A S

    2015-01-01

    Beta-decay into broad resonances gives a distorted lineshape in the observed energy spectrum. Part of the distortion arises from the phase space factor, but we show that the beta-decay matrix element may also contribute. Based on a schematic model for p-wave continuum neutron states it is argued that beta-decay directly to the continuum should be considered as a possible contributing mechanism in many decays close to the driplines. The signatures in R-matrix fits for such decays directly to continuum states are discussed and illustrated through an analysis of the beta-decay of $^8$B into $2^+$ states in $^8$Be.

  20. Broad resonances and beta-decay

    E-print Network

    K. Riisager; H. O. U. Fynbo; S. Hyldegaard; A. S. Jensen

    2015-03-19

    Beta-decay into broad resonances gives a distorted lineshape in the observed energy spectrum. Part of the distortion arises from the phase space factor, but we show that the beta-decay matrix element may also contribute. Based on a schematic model for p-wave continuum neutron states it is argued that beta-decay directly to the continuum should be considered as a possible contributing mechanism in many decays close to the driplines. The signatures in R-matrix fits for such decays directly to continuum states are discussed and illustrated through an analysis of the beta-decay of $^8$B into $2^+$ states in $^8$Be.

  1. Hadronic decays of the highly excited resonances

    NASA Astrophysics Data System (ADS)

    Ge, Jing; Ye, Dan-Dan; Zhang, Ailin

    2015-05-01

    Hadronic decays of the highly excited resonances have been studied in the model. The widths of all possible hadronic decay channels of the have been computed. , , , , and can be produced from hadronic decays of the , and the relevant hadronic decay widths have been particularly paid attention to. The hadronic decay widths of to or may be large, and the numerical results are different in different assignments of and . The hadronic decay widths of to , or are very small, and different in different assignments of.

  2. Non-Gaussianity from resonant curvaton decay

    E-print Network

    Alex Chambers; Sami Nurmi; Arttu Rajantie

    2010-06-13

    We calculate curvature perturbations in the scenario in which the curvaton field decays into another scalar field via parametric resonance. As a result of a nonlinear stage at the end of the resonance, standard perturbative calculation techniques fail in this case. Instead, we use lattice field theory simulations and the separate universe approximation to calculate the curvature perturbation as a nonlinear function of the curvaton field. For the parameters tested, the generated perturbations are highly non-Gaussian and not well approximated by the usual fNL parameterisation. Resonant decay plays an important role in the curvaton scenario and can have a substantial effect on the resulting perturbations.

  3. Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector

    E-print Network

    ATLAS Collaboration

    2014-07-29

    The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying to dielectron or dimuon final states. Results are presented from an analysis of proton-proton (pp) collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb-1 in the dielectron channel and 20.5 fb-1 in the dimuon channel. A narrow resonance with Standard Model Z couplings to fermions is excluded at 95% confidence level for masses less than 2.79 TeV in the dielectron channel, 2.53 TeV in the dimuon channel, and 2.90 TeV in the two channels combined. Limits on other model interpretations are also presented, including a grand-unification model based on the E6 gauge group, Z* bosons, Minimal Z' Models, a spin-2 graviton excitation from Randall-Sundrum models, quantum black holes and a Minimal Walking Technicolor model with a composite Higgs boson.

  4. Trampoline Resonator Fabrication for Tests of Quantum Mechanics at High Mass

    NASA Astrophysics Data System (ADS)

    Weaver, Matthew; Pepper, Brian; Sonin, Petro; Eerkens, Hedwig; Buters, Frank; de Man, Sven; Bouwmeester, Dirk

    2014-03-01

    There has been much interest recently in optomechanical devices that can reach the ground state. Two requirements for achieving ground state cooling are high optical finesse in the cavity and high mechanical quality factor. We present a set of trampoline resonator devices using high stress silicon nitride and superpolishing of mirrors with sufficient finesse (as high as 60,000) and quality factor (as high as 480,000) for ground state cooling in a dilution refrigerator. These devices have a higher mass, between 80 and 100 ng, and lower frequency, between 200 and 500 kHz, than other devices that have been cooled to the ground state, enabling tests of quantum mechanics at a larger mass scale.

  5. Search for high mass gammagamma resonances ine^ + e^ - to ell ^ + ell ^ - gamma gamma ,nu bar nu gamma gamma andqbar qgamma gamma at LEP Iat LEP I

    Microsoft Academic Search

    P. Abreu; W. Adam; T. Adye; E. Agasi; I. Ajinenko; R. Aleksan; G. D. Alekseev; R. Alemany; P. P. Allport; S. Almehed; U. Amaldi; S. Amato; A. Andreazza; M. L. Andrieux; P. Antilogus; W.-D. Apel; Y. Arnoud; B. Åsman; J.-E. Augustin; A. Augustinus; P. Baillon; P. Bambade; F. Barao; R. Barate; M. Barbi; D. Y. Bardin; A. Baroncelli; O. Barring; J. A. Barrio; W. Bartl; M. J. Bates; M. Battaglia; M. Baubillier; J. Baudot; K.-H. Becks; M. Begalli; P. Beilliere; Yu. Belokopytov; A. C. Benvenuti; M. Berggren; D. Bertini; D. Bertrand; F. Bianchi; M. Bigi; M. S. Bilenky; P. Billoir; D. Bloch; M. Blume; T. Bolognese; M. Bonesini; W. Bonivento; P. S. L. Booth; G. Borisov; C. Bosio; O. Botner; E. Boudinov; B. Bouquet; C. Bourdarios; T. J. V. Bowcock; M. Bozzo; P. Branchini; K. D. Brand; T. Brenke; R. A. Brenner; C. Bricman; R. C. A. Brown; P. Bruckman; J.-M. Brunet; L. Bugge; T. Buran; T. Burgsmueller; P. Buschmann; A. Buys; S. Cabrera; M. Caccia; M. Calvi; A. J. Camacho Rozas; T. Camporesi; V. Canale; M. Canepa; K. Cankocak; F. Cao; F. Carena; L. Carroll; C. Caso; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; V. Chabaud; Ph. Charpentier; L. Chaussard; P. Checchia; G. A. Chelkov; M. Chen; R. Chierici; P. Chliapnikov; P. Chochula; V. Chorowicz; J. Chudoba; V. Cindro; P. Collins; J. L. Contreras; R. Contri; E. Cortina; G. Cosme; F. Cossutti; H. B. Crawley; D. Crennell; G. Crosetti; J. Cuevas Maestro; S. Czellar; E. Dahl-Jensen; J. Dahm; B. Dalmagne; M. Dam; G. Damgaard; P. D. Dauncey; M. Davenport; W. Da Silva; C. Defoix; A. Deghorain; G. Della Ricca; P. Delpierre; N. Demaria; A. de Angelis; W. de Boer; S. de Brabandere; C. de Clercq; C. de La Vaissiere; B. de Lotto; A. de Min; L. de Paula; C. de Saint-Jean; H. Dijkstra; L. di Ciaccio; F. Djama; J. Dolbeau; M. Donszelmann; K. Doroba; M. Dracos; J. Drees; K.-A. Drees; M. Dris; J.-D. Durand; D. Edsall; R. Ehret; G. Eigen; T. Ekelof; G. Ekspong; M. Elsing; J.-P. Engel; B. Erzen; M. Espirito Santo; E. Falk; D. Fassouliotis; M. Feindt; A. Fenyuk; A. Ferrer; S. Fichet; T. A. Filippas; A. Firestone; P.-A. Fischer; H. Foeth; E. Fokitis; F. Fontanelli; F. Formenti; B. Franek; P. Frenkiel; D. C. Fries; A. G. Frodesen; R. Fruhwirth; F. Fulda-Quenzer; J. Fuster; A. Galloni; D. Gamba; M. Gandelman; C. Garcia; J. Garcia; C. Gaspar; U. Gasparini; Ph. Gavillet; E. N. Gazis; D. Gele; J.-P. Gerber; M. Gibbs; R. Gokieli; B. Golob; G. Gopal; L. Gorn; M. Gorski; Yu. Gouz; V. Gracco; E. Graziani; G. Grosdidier; K. Grzelak; S. Gumenyuk; P. Gunnarsson; M. Gunther; J. Guy; F. Hahn; S. Hahn; A. Hallgren; K. Hamacher; W. Hao; F. J. Harris; V. Hedberg; R. Henriques; J. J. Hernandez; P. Herquet; H. Herr; T. L. Hessing; E. Higon; H. J. Hilke; T. S. Hill; S.-O. Holmgren; P. J. Holt; D. Holthuizen; S. Hoorelbeke; M. Houlden; J. Hrubec; K. Huet; K. Hultqvist; J. N. Jackson; R. Jacobsson; P. Jalocha; R. Janik; Ch. Jarlskog; G. Jarlskog; P. Jarry; B. Jean-Marie; E. K. Johansson; L. Jonsson; P. Jonsson; C. Joram; P. Juillot; M. Kaiser; F. Kapusta; K. Karafasoulis; M. Karlsson; E. Karvelas; S. Katsanevas; E. C. Katsoufis; R. Keranen; Yu. Khokhlov; B. A. Khomenko; N. N. Khovanski; B. King; N. J. Kjaer; H. Klein; A. Klovning; P. Kluit; B. Koene; P. Kokkinias; M. Koratzinos; K. Korcyl; C. Kourkoumelis; O. Kouznetsov; P.-H. Kramer; M. Krammer; C. Kreuter; I. Kronkvist; Z. Krumstein; W. Krupinski; P. Kubinec; W. Kucewicz; K. Kurvinen; C. Lacasta; I. Laktineh; J. W. Lamsa; L. Lanceri; P. Langefeld; I. Last; J.-P. Laugier; R. Lauhakangas; G. Leder; F. Ledroit; V. Lefebure; C. K. Legan; R. Leitner; Y. Lemoigne; J. Lemonne; G. Lenzen; V. Lepeltier; T. Lesiak; J. Libby; D. Liko; R. Lindner; A. Lipniacka; I. Lippi; B. Loerstad; J. G. Loken; J. M. Lopez; D. Loukas; P. Lutz; L. Lyons; J. MacNaughton; G. Maehlum; A. Maio; T. G. M. Malmgren; V. Malychev; F. Mandl; J. Marco; R. Marco; B. Marechal; M. Margoni; J.-C. Marin; C. Mariotti; A. Markou; T. Maron; C. Martinez-Rivero; F. Martinez-Vidal; S. Marti I Garcia; J. Masik; F. Matorras; C. Matteuzzi; G. Matthiae; M. Mazzucato; M. Mc Cubbin; R. Mc Kay; R. Mc Nulty; J. Medbo; M. Merk; C. Meroni; S. Meyer; W. T. Meyer; A. Miagkov; M. Michelotto; E. Migliore; L. Mirabito; W. A. Mitaroff; U. Mjoernmark; T. Moa; R. Moeller; K. Moenig; M. R. Monge; P. Morettini; H. Mueller; L. M. Mundim; W. J. Murray; B. Muryn; G. Myatt; F. Naraghi; F. L. Navarria; S. Navas; K. Nawrocki; P. Negri; W. Neumann; N. Neumeister; R. Nicolaidou; B. S. Nielsen; M. Nieuwenhuizen; V. Nikolaenko; P. Niss; A. Nomerotski; A. Normand; M. Novak; W. Oberschulte-Beckmann; V. Obraztsov; A. G. Olshevski; A. Onofre; R. Orava; K. Osterberg; A. Ouraou; P. Paganini; M. Paganoni; P. Pages; R. Pain; H. Palka; Th. D. Papadopoulou; K. Papageorgiou; L. Pape; C. Parkes; F. Parodi; A. Passeri; M. Pegoraro; L. Peralta; M. Pernicka; A. Perrotta; C. Petridou; A. Petrolini; M. Petrovyck

    1996-01-01

    A search for high mass photon pairs from the processese^ + e^ - to ell ^ + ell ^ - gamma gamma ,e^ + e^ - to qbar qgamma gamma ande^ + e^ - to nu bar nu gamma gamma with the DELPHI detector at LEP I is reported. From a data sample containing 3.5 million hadronic Z0 decays, collected

  6. Three-body decay of many-body resonances

    SciTech Connect

    Jensen, A.S.; Fedorov, D.V.; Fynbo, H.O.U. [Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark); Garrido, E. [Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid (Spain)

    2005-10-14

    We use the hyperspherical coordinates to describe decay of many-body resonances. Direct and sequential decay are described by different paths in the distances between the particles. We generalize the WKB expression for the {alpha}-decay width to decay of three charged particles. Decay mechanisms and resonance structures are computed in coordinate space. The energy distributions of the particles after decay are discussed. Moderate s-wave scattering lengths prefer decay via corresponding virtual state possibly leaving unique fingerprints of this reminiscence of the Efimov effect in the decay of excited states. Numerical illustrations are resonances in 6He, 12C, 17Ne.

  7. Internal Pair Decay of Giant Resonances

    NASA Astrophysics Data System (ADS)

    Montoya, Carlos Peter

    The internal pair decay of giant resonances is studied experimentally and theoretically. From the equations governing the pair decay of E0 and E1 transitions in reaction aligned nuclei the two multipoles are shown to have observables which differ significantly. The strength functions for the pair decay of giant resonances, and specifically the isoscalar and isovector giant monopole (GMR) and quadrupole (GQR) resonances, are derived. These strength functions are used with the CASCADE statistical model code to predict internal pair decay in hot nuclei. The design of a highly segmented array of plastic phoswich scintillators, tailored for the measurement of high energy pairs, is described. Electron (positron) energies of 2-30 MeV can be measured by each individual element, with a total transition energy resolution of delta E/E = 13% for a 20 MeV transition. The array covers 29% of 4pi and its efficiency is 1.6% for a 6-MeV E0 internal pair decay, and 1.1% for an 18-MeV E1 transition. The detector is shown to be capable of differentiating between E0 and E1 transitions. An event simulator is developed that successfully describes all observables. The cross section for pairs from the decay of the GDR in ^{12}C is measured to be 410 nb to the ground state and 140 nb to the first excited state. Comparison with the available gamma-cross sections yields conversion coefficients which are consistent with theoretical predictions. The pair decay of the giant dipole resonance built on high excited states is measured in ^ {110}Sn and ^{110 }Cd. The two nuclei are produced in heavy ion fusion reactions with similar temperatures and spin distributions. A CASCADE calculation for hot ^{110}Sn indicates that the GDR dominates the pair decay spectrum. The measured pair energy spectrum is fit very well by the response folded CASCADE calculation at energies above 10 MeV. The measured angular correlations are consistent with the predicted E1 dominance of the spectrum, and no evidence of the isovector GMR or GQR are found.

  8. Searches for resonances decaying to top

    SciTech Connect

    Meyer, Jorg; /Gottingen U.

    2008-04-01

    Searches for resonances decaying to top pairs in p{anti p} collisions at {radical}s = 1.96 TeV are presented. An upper limit on the production of a narrow width resonance is given using 2.1 fb{sup -1} data collected by the D0 experiment. Limits on the couplings of a massive gluon are given and a measurement of the differential cross section d{sigma}/dM{sub t{anti t}} is presented using 1.9 fb{sup -1} data collected by the CDF experiment.

  9. Effect of resonance decays on hadron elliptic flows 

    E-print Network

    Greco, V.; Ko, Che Ming.

    2004-01-01

    Within the quark coalescence model, we study effects of resonance decays, and of the quark momentum distribution in hadrons, on the elliptic flows of stable hadrons. We find that, with the exception of rho-meson decays, the resonance decays could...

  10. Search for a high mass SM-like Higgs boson in the H to ZZ to llqq decay channel in CMS

    E-print Network

    Eduardo Navarro De Martino; for the CMS Collaboration

    2015-05-13

    A search for a high mass standard-model-like Higgs boson decaying into two Z bosons with subsequent decay into two leptons and two quarks performed at CMS is presented. The analysis is based on 19.7 1/fb of proton-proton collisions produced in LHC at center-of-mass energy of 8 TeV. Different categories are exploited in order to isolate hypothetical Higgs boson-like signals in the mass range up to 1 TeV. The data are interpreted in terms of a standard-model-like Higgs boson as well as an electroweak singlet, visible through the interference with the 125 GeV Higgs boson. No evidence of a signal is found and upper limits are set on the production cross section and other model parameters.

  11. Search for Heavy Resonances Decaying to Taus in 7 TeV Proton-Proton Collisions at the Large Hadron Collider 

    E-print Network

    Gurrola, Alfredo

    2011-10-21

    : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 11 3. MOTIVATION FOR Z 0 BOSONS : : : : : : : : : : : : : : : : : : : : : : : 14 4. HIGH MASS RESONANCES DECAYING TO TAU PAIRS : : : : : : : : 17 5. THE LARGE HADRON COLLIDER : : : : : : : : : : : : : : : : : : : : : 23 6. THE CMS DETECTOR....3.1 The Pixel Detector : : : : : : : : : : : : : : : : : : : : : : : : 34 6.3.2 The Silicon Strip Detector : : : : : : : : : : : : : : : : : : : : 35 6.4 The Muon System : : : : : : : : : : : : : : : : : : : : : : : : : : : : 35 6.5 Calorimeters...

  12. Search for High-Mass e{sup +}e{sup -} Resonances in pp Collisions at {radical}(s)=1.96 TeV

    SciTech Connect

    Aaltonen, T.; Maki, T.; Mehtala, P.; Orava, R.; Remortel, N. van [Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland); Adelman, J.; Brubaker, E.; Fedorko, W. T.; Grosso-Pilcher, C.; Kim, Y. K.; Krop, D.; Kwang, S.; Lee, H. S.; Paramonov, A. A.; Schmidt, M. A.; Shiraishi, S.; Shochet, M.; Wilbur, S.; Wolfe, C.; Yang, U. K. [Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)] (and others)

    2009-01-23

    A search for high-mass resonances in the e{sup +}e{sup -} final state is presented based on 2.5 fb{sup -1} of {radical}(s)=1.96 TeV pp collision data from the CDF II detector at the Fermilab Tevatron. The largest excess over the standard model prediction is at an e{sup +}e{sup -} invariant mass of 240 GeV/c{sup 2}. The probability of observing such an excess arising from fluctuations in the standard model anywhere in the mass range of 150-1000 GeV/c{sup 2} is 0.6% (equivalent to 2.5{sigma}). We exclude the standard model coupling Z{sup '} and the Randall-Sundrum graviton for k/M{sub Pl}=0.1 with masses below 963 and 848 GeV/c{sup 2} at the 95% credibility level, respectively.

  13. Resonant edge magnetoplasmons and their decay in graphene.

    PubMed

    Kumada, N; Roulleau, P; Roche, B; Hashisaka, M; Hibino, H; Petkovi?, I; Glattli, D C

    2014-12-31

    We investigate resonant edge magnetoplasmons (EMPs) and their decay in graphene by high-frequency electronic measurements. From EMP resonances in disk shaped graphene, we show that the dispersion relation of EMPs is nonlinear due to interactions, giving rise to the intrinsic decay of EMP wave packets. We also identify extrinsic dissipation mechanisms due to interaction with localized states in bulk graphene from the decay time of EMP wave packets. We indicate that, owing to the linear band structure and the sharp edge potential, EMP dissipation in graphene can be lower than that in GaAs systems. PMID:25615366

  14. Heavy meson decays into light resonances

    SciTech Connect

    Delbourgo, R.; Liu, D. (Department of Physics, University of Tasmania, Hobart, (Australia))

    1995-01-01

    We analyze the Lorentz structures of weak decay matrix elements between meson states of arbitrary spin. Simplifications arise in the transition amplitudes for a heavy meson decaying into the light one via a Bethe-Salpeter approach which incorporates heavy quark symmetry. The phenomenological consequences of our results on several semileptonic, nonleptonic, and flavor-changing neutral-current-induced decays of heavy flavored mesons are derived and discussed.

  15. Vector Boson Scattering at High Mass with ATLAS

    SciTech Connect

    Davison, Adam [Department of Physics and Astronomy, University College London (United Kingdom)

    2008-11-23

    In the absence of a light Higgs boson, the mechanism of electroweak symmetry breaking will be best studied in processes of vector boson scattering at high mass. Various models predict resonances in this channel. Scalar and vector resonances have been investigated in the WW, WZ and ZZ channels. The ability of ATLAS to measure the di-boson cross-section over a range of centre-of-mass energies has been studied with particular attention paid to the reconstruction of jet pairs with low opening angle resulting from the decays of highly boosted vector bosons.

  16. Vector boson scattering at high mass with ATLAS

    E-print Network

    Adam Davison

    2008-10-14

    In the absence of a light Higgs boson, the mechanism of electroweak symmetry breaking will be best studied in processes of vector boson scattering at high mass. Various models predict resonances in this channel. Scalar and vector resonances have been investigated in the WW, WZ and ZZ channels. The ability of ATLAS to measure the di-boson cross-section over a range of centre-of-mass energies has been studied with particular attention paid to the reconstruction of jet pairs with low opening angle resulting from the decays of highly boosted vector bosons.

  17. Resonant structure of ?-->3??0?? and ?-->???? decays

    NASA Astrophysics Data System (ADS)

    Edwards, K. W.; Janicek, R.; Patel, P. M.; Sadoff, A. J.; Ammar, R.; Baringer, P.; Bean, A.; Besson, D.; Davis, R.; Kotov, S.; Kravchenko, I.; Kwak, N.; Zhao, X.; Anderson, S.; Frolov, V. V.; Kubota, Y.; Lee, S. J.; Mahapatra, R.; O'neill, J. J.; Poling, R.; Riehle, T.; Smith, A.; Ahmed, S.; Alam, M. S.; Athar, S. B.; Jian, L.; Ling, L.; Mahmood, A. H.; Saleem, M.; Timm, S.; Wappler, F.; Anastassov, A.; Duboscq, J. E.; Gan, K. K.; Gwon, C.; Hart, T.; Honscheid, K.; Kagan, H.; Kass, R.; Lorenc, J.; Schwarthoff, H.; von Toerne, E.; Zoeller, M. M.; Richichi, S. J.; Severini, H.; Skubic, P.; Undrus, A.; Bishai, M.; Chen, S.; Fast, J.; Hinson, J. W.; Lee, J.; Menon, N.; Miller, D. H.; Shibata, E. I.; Shipsey, I. P.; Kwon, Y.; Lyon, A. L.; Thorndike, E. H.; Jessop, C. P.; Lingel, K.; Marsiske, H.; Perl, M. L.; Savinov, V.; Ugolini, D.; Zhou, X.; Coan, T. E.; Fadeyev, V.; Korolkov, I.; Maravin, Y.; Narsky, I.; Shelkov, V.; Stroynowski, R.; Ye, J.; Wlodek, T.; Artuso, M.; Ayad, R.; Dambasuren, E.; Kopp, S.; Majumder, G.; Moneti, G. C.; Mountain, R.; Schuh, S.; Skwarnicki, T.; Stone, S.; Titov, A.; Viehhauser, G.; Wang, J. C.; Wolf, A.; Wu, J.; Csorna, S. E.; McLean, K. W.; Marka, S.; Xu, Z.; Godang, R.; Kinoshita, K.; Lai, I. C.; Pomianowski, P.; Schrenk, S.; Bonvicini, G.; Cinabro, D.; Greene, R.; Perera, L. P.; Zhou, G. J.; Chan, S.; Eigen, G.; Lipeles, E.; Schmidtler, M.; Shapiro, A.; Sun, W. M.; Urheim, J.; Weinstein, A. J.; Würthwein, F.; Jaffe, D. E.; Masek, G.; Paar, H. P.; Potter, E. M.; Prell, S.; Sharma, V.; Asner, D. M.; Eppich, A.; Gronberg, J.; Hill, T. S.; Lange, D. J.; Morrison, R. J.; Nelson, T. K.; Richman, J. D.; Briere, R. A.; Behrens, B. H.; Ford, W. T.; Gritsan, A.; Krieg, H.; Roy, J.; Smith, J. G.; Alexander, J. P.; Baker, R.; Bebek, C.; Berger, B. E.; Berkelman, K.; Blanc, F.; Boisvert, V.; Cassel, D. G.; Dickson, M.; Drell, P. S.; Ecklund, K. M.; Ehrlich, R.; Foland, A. D.; Gaidarev, P.; Galik, R. S.; Gibbons, L.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hopman, P. I.; Jones, C. D.; Kreinick, D. L.; Lee, T.; Liu, Y.; Meyer, T. O.; Mistry, N. B.; Ng, C. R.; Nordberg, E.; Patterson, J. R.; Peterson, D.; Riley, D.; Thayer, J. G.; Thies, P. G.; Valant-Spaight, B.; Warburton, A.; Avery, P.; Lohner, M.; Prescott, C.; Rubiera, A. I.; Yelton, J.; Zheng, J.; Brandenburg, G.; Ershov, A.; Gao, Y. S.; Kim, D. Y.-J.; Wilson, R.; Browder, T. E.; Li, Y.; Rodriguez, J. L.; Yamamoto, H.; Bergfeld, T.; Eisenstein, B. I.; Ernst, J.; Gladding, G. E.; Gollin, G. D.; Hans, R. M.; Johnson, E.; Karliner, I.; Marsh, M. A.; Palmer, M.; Plager, C.; Sedlack, C.; Selen, M.; Thaler, J. J.; Williams, J.

    2000-04-01

    The resonant structure of the four pion final state in the decay ?-->3??0?? has been analyzed using 4.27 million ?+?- pairs collected by the CLEO II experiment at the Cornell Electron Storage Ring. A partial wave analysis of the resonant structure of the ?-->3??0?? decay has been performed; the spectral decomposition of the four pion system is dominated by the ?? and a1? final states. The mass and width of the ?' resonance have been extracted from a fit to the ?-->???? spectral function. We have searched for second class currents in the decay ?-->???? using spin-parity analysis and established an upper limit on the non-vector current contribution.

  18. Curvaton decay by resonant production of the Standard Model higgs

    SciTech Connect

    Enqvist, Kari; Figueroa, Daniel G.; Lerner, Rose N., E-mail: kari.enqvist@helsinki.fi, E-mail: daniel.figueroa@unige.ch, E-mail: rose.lerner@helsinki.fi [University of Helsinki and Helsinki Institute of Physics, P.O. Box 64, FI-00014, Helsinki (Finland)

    2013-01-01

    We investigate in detail a model where the curvaton is coupled to the Standard Model higgs. Parametric resonance might be expected to cause a fast decay of the curvaton, so that it would not have time to build up the curvature perturbation. However, we show that this is not the case, and that the resonant decay of the curvaton may be delayed even down to electroweak symmetry breaking. This delay is due to the coupling of the higgs to the thermal background, which is formed by the Standard Model degrees of freedom created from the inflaton decay. We establish the occurrence of the delay by considering the curvaton evolution and the structure of the higgs resonances. We then provide analytical expressions for the delay time, and for the subsequent resonant production of the higgs, which ultimately leads to the curvaton effective decay width. Contrary to expectations, it is possible to obtain the observed curvature perturbation for values of the curvaton-higgs coupling as large as 10{sup ?1}. Our calculations also apply in the general case of curvaton decay into any non Standard Model species coupled to the thermal background.

  19. Recoilless Resonant Capture of Antineutrinos from Tritium Decay

    E-print Network

    R. S. Raghavan

    2006-09-13

    Monoenergetic antineutrinos emitted in the bound state beta-decay of H can be resonantly captured in 3He. Favorable conditions are offered by tritide technology for ultra sharp recoilless resonant capture of the 18.6 keV nubare with sigma~5x10-32 cm2, 11 orders of magnitude larger than sigma(nubare +p). The gravitational red shift of neutrinos and the mixing angle theta13 may be measurable in bench scale baselines.

  20. AnalyzeNNLS: Magnetic resonance multiexponential decay image analysis

    NASA Astrophysics Data System (ADS)

    Bjarnason, Thorarin A.; Mitchell, J. Ross

    2010-10-01

    Exponential decays are fundamental to magnetic resonance imaging, yet adequately sampling and analyzing multiexponential decays is rarely attempted. The advantage of multiexponential analysis is the quantification of sub-voxel structure caused by water compartmentalization, with application as a non-invasive imaging biomarker for myelin. We have developed AnalyzeNNLS, software designed specifically for multiexponential decay image analysis that has a user-friendly graphical user interface and can analyze data from many MR manufacturers. AnalyzeNNLS is a simple, platform independent analysis tool that was created using the extensive mathematical and visualization libraries in Matlab, and released as open source code allowing scientists to evaluate, scrutinize, improve, and expand.

  1. Pion and kaon decay constants: Lattice versus resonance chiral theory

    SciTech Connect

    Sanz-Cillero, J.J. [Departament de Fisica Teorica, IFIC, Universitat de Valencia - CSIC Apt. Correus 22085, E-46071 Valencia (Spain)

    2004-11-01

    The Lattice results for the pion and kaon decay constants are analyzed within the Resonance Chiral Theory framework in the large N{sub C} limit. The approximately linear behavior of the observable at large light-quark mass is explained through the interaction with the lightest multiplet of scalar resonances. The analysis of the Lattice results allows to obtain the resonance mass M{sub S}=1049{+-}25 MeV and some of the Chiral Perturbation Theory parameters at leading order in 1/N{sub C}.

  2. Curvaton Decay by Resonant Production of the Standard Model Higgs

    E-print Network

    Enqvist, Kari; Lerner, Rose N

    2012-01-01

    We investigate in detail a model where the curvaton is coupled to the Standard Model higgs. Parametric resonance might be expected to cause a fast decay of the curvaton, so that it would not have time to build up the curvature perturbation. However, we show that this is not the case, and that the resonant decay of the curvaton may be delayed even down to electroweak symmetry breaking. This delay is due to the coupling of the higgs to the thermal background, which is formed by the Standard Model degrees of freedom created from the inflaton decay. We establish the occurrence of the delay by considering the curvaton evolution and the structure of the higgs resonances. We then provide analytical expressions for the delay time, and for the subsequent resonant production of the higgs, which ultimately leads to the curvaton effective decay width. Contrary to expectations, it is possible to obtain the observed curvature perturbation for values of the curvaton-higgs coupling as large as 0.1. Our calculations also appl...

  3. Resonance-assisted decay of nondispersive wave packets.

    PubMed

    Wimberger, Sandro; Schlagheck, Peter; Eltschka, Christopher; Buchleitner, Andreas

    2006-07-28

    We present a quantitative semiclassical theory for the decay of nondispersive electronic wave packets in driven, ionizing Rydberg systems. Statistically robust quantities are extracted combining resonance-assisted tunneling with subsequent transport across chaotic phase space and a final ionization step. PMID:16907569

  4. Recoilless Resonant Capture of Antineutrinos from Tritium Decay

    E-print Network

    Raghavan, R S

    2006-01-01

    Monoenergetic antineutrinos emitted in the bound state beta-decay of H can be resonantly captured in 3He. Favorable conditions are offered by technologies for 3H and 3He storage in metals for ultra sharp recoilless resonant capture of the 18.6 keV nubare with sigma~10-31 cm2, 11 orders of magnitude larger than sigma(nubare +p). The gravitational red shift of neutrinos and the mixing angle theta13 may be measurable in bench scale baselines.

  5. Resonance chiral Lagrangian currents and tau decay Monte Carlo

    E-print Network

    O. Shekhovtsova; T. Przedzinski; P. Roig; Z. Was

    2013-01-16

    Measurements of tau lepton, because of its long lifetime, large mass and parity sensitive couplings lead to broad physics interest. From the perspective of high-energy experiments such as at LHC, knowledge of tau lepton properties offers an important ingredient of new physics signatures. From the perspective of lower energies, tau lepton decays constitute an excellent laboratory for hadronic interactions. At present,hundreds of millions of tau decays have been amassed by both Belle and BaBar experiments. It is of utmost importance to represent such data in a form as useful for general applications as possible. In the present paper we describe the set of form factors for hadronic tau decays based on Resonance Chiral Theory. The technical implementation of the form factors in FORTRAN code is also explained. It is shown how it can be installed into TAUOLA Monte Carlo program. Then it is rather easy to implement into software environments of not only Belle and BaBar collaborations but also for FORTRAN and C++ applications of LHC. Description of the current for each tau decay mode is complemented with technical numerical tests. The set is ready for fits, parameters to be used in fits are explained. Arrangements to work with the experimental data not requiring unfolding are prepared. Hadronic currents, ready for confrontation with the tau decay data, but not yet ready for the general use, cover more than 88% of hadronic tau decay width.

  6. Discriminating top-antitop resonances using azimuthal decay correlations

    NASA Astrophysics Data System (ADS)

    Baumgart, Matthew; Tweedie, Brock

    2011-09-01

    Top-antitop pairs produced in the decay of a new heavy resonance will exhibit spin correlations that contain valuable coupling information. When the tops decay, these correlations imprint themselves on the angular patterns of the final quarks and leptons. While many approaches to the measurement of top spin correlations are known, the most common ones require detailed kinematic reconstructions and are insensitive to some important spin interference effects. In particular, spin-1 resonances with mostly-vector or mostly-axial couplings to top cannot be easily discriminated from one another without appealing to mass-suppressed effects or to more model-dependent interference with continuum Standard Model production. Here, we propose to probe the structure of a resonance's couplings to tops by measuring the azimuthal angles of the tops' decay products about the production axis. These angles exhibit modulations which are typically O(0.1-1), and which by themselves allow for discrimination of spin-0 from higher spins, measurement of the CP-phase for spin-0, and measurement of the vector/axial composition for spins1and 2. For relativistic tops, the azimuthal decay angles can be well-approximated without detailed knowledge of the tops' velocities, and appear to be robust against imperfect energy measurements and neutrino reconstructions. We illustrate this point in the highly challenging dileptonic decay mode, which also exhibits the largest modulations. We comment on the relevance of these observables for testing axigluon-like models that explain the top quark A FB anomaly at the Tevatron, through direct production at the LHC.

  7. Structure and direct decay of Giant Monopole Resonances

    NASA Astrophysics Data System (ADS)

    Avez, B.; Simenel, C.

    2013-06-01

    We study structure and direct decay of the Giant Monopole Resonance (GMR) at the Random Phase Approximation (RPA) level using the time-dependent energy density functional method in the linear response regime in a few doubly magic nuclei. A proper treatment of the continuum, through the use of large coordinate space, allows for a separation between the nucleus and its emitted nucleons. The microscopic structure of the GMR is investigated with the decomposition of the strength function into individual single-particle quantum numbers. A similar microscopic decomposition of the spectra of emitted nucleons by direct decay of the GMR is performed. In this harmonic picture of giant resonance, shifting every contribution by the initial single-particle energy allows to reconstruct the GMR strength function. The RPA residual interaction couples bound 1-particle 1-hole states to unbound ones, allowing for the total decay of the GMR. In this article, we then intend to get an understanding of the direct decay mechanism from coherent one-particle-one-hole superpositions, while neglecting more complex configurations. Time-dependent beyond mean-field approaches should be used, in the future, to extend this method.

  8. Phase-Space Exploration in Nuclear Giant Resonance Decay

    E-print Network

    S. Drozdz; S. Nishizaki; J. Speth; J. Wambach

    1994-07-08

    The rate of phase-space exploration in the decay of isovector and isoscalar giant quadrupole resonances in $^{40}$Ca is analyzed. The study is based on the time dependence of the survival probability and of the spectrum of generalized entropies evaluated in the space of 1p-1h and 2p-2h states. If the 2p-2h background shows the characteristics typical for chaotic systems, the isovector excitation evolves almost statistically while the isoscalar excitation remains largely localized, even though it penetrates the whole available phase space.

  9. Search for New High-Mass Particles Decaying to Lepton Pairs in pp¯ Collisions at &surd;(s)=1.96 TeV

    Microsoft Academic Search

    A. Abulencia; D. Acosta; J. Adelman; T. Affolder; T. Akimoto; M. G. Albrow; D. Ambrose; S. Amerio; D. Amidei; A. Anastassov; K. Anikeev; A. Annovi; J. Antos; M. Aoki; G. Apollinari; J.-F. Arguin; T. Arisawa; A. Artikov; W. Ashmanskas; A. Attal; F. Azfar; P. Azzi-Bacchetta; P. Azzurri; N. Bacchetta; H. Bachacou; W. Badgett; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; S. Baroiant; V. Bartsch; G. Bauer; F. Bedeschi; S. Behari; S. Belforte; G. Bellettini; J. Bellinger; A. Belloni; E. Ben-Haim; D. Benjamin; A. Beretvas; J. Beringer; T. Berry; A. Bhatti; M. Binkley; D. Bisello; M. Bishai; R. E. Blair; C. Blocker; K. Bloom; B. Blumenfeld; A. Bocci; A. Bodek; V. Boisvert; G. Bolla; A. Bolshov; D. Bortoletto; J. Boudreau; S. Bourov; A. Boveia; B. Brau; C. Bromberg; E. Brubaker; J. Budagov; H. S. Budd; S. Budd; K. Burkett; G. Busetto; P. Bussey; K. L. Byrum; S. Cabrera; M. Campanelli; M. Campbell; F. Canelli; A. Canepa; D. Carlsmith; R. Carosi; S. Carron; M. Casarsa; A. Castro; P. Catastini; D. Cauz; M. Cavalli-Sforza; A. Cerri; L. Cerrito; S. H. Chang; J. Chapman; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; F. Chlebana; I. Cho; K. Cho; D. Chokheli; J. P. Chou; P. H. Chu; S. H. Chuang; K. Chung; W. H. Chung; Y. S. Chung; M. Ciljak; C. I. Ciobanu; M. A. Ciocci; A. Clark; D. Clark; M. Coca; A. Connolly; M. E. Convery; J. Conway; B. Cooper; K. Copic; M. Cordelli; G. Cortiana; A. Cruz; J. Cuevas; R. Culbertson; D. Cyr; S. Daronco; S. D'Auria; M. D'Onofrio; D. Dagenhart; P. de Barbaro; S. de Cecco; A. Deisher; G. de Lentdecker; M. Dell'Orso; S. Demers; L. Demortier; J. Deng; M. Deninno; D. de Pedis; P. F. Derwent; C. Dionisi; J. R. Dittmann; P. Dituro; C. Dörr; A. Dominguez; S. Donati; M. Donega; P. Dong; J. Donini; T. Dorigo; S. Dube; K. Ebina; J. Efron; J. Ehlers; R. Erbacher; D. Errede; S. Errede; R. Eusebi; H. C. Fang; S. Farrington; I. Fedorko; W. T. Fedorko; R. G. Feild; M. Feindt; J. P. Fernandez; R. Field; G. Flanagan; L. R. Flores-Castillo; A. Foland; S. Forrester; G. W. Foster; M. Franklin; J. C. Freeman; Y. Fujii; I. Furic; A. Gajjar; M. Gallinaro; J. Galyardt; J. E. Garcia; M. Garcia Sciveres; A. F. Garfinkel; C. Gay; H. Gerberich; E. Gerchtein; D. Gerdes; S. Giagu; P. Giannetti; A. Gibson; K. Gibson; C. Ginsburg; K. Giolo; M. Giordani; M. Giunta; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; N. Goldschmidt; J. Goldstein; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. González; I. Gorelov; A. T. Goshaw; Y. Gotra; K. Goulianos; A. Gresele; M. Griffiths; S. Grinstein; C. Grosso-Pilcher; U. Grundler; J. Guimaraes da Costa; C. Haber; S. R. Hahn; K. Hahn; E. Halkiadakis; B.-Y. Han; R. Handler; F. Happacher; K. Hara; M. Hare; S. Harper; R. F. Harr; R. M. Harris; K. Hatakeyama; J. Hauser; C. Hays; H. Hayward; A. Heijboer; B. Heinemann; J. Heinrich; M. Hennecke; M. Herndon; J. Heuser; D. Hidas; C. S. Hill; D. Hirschbuehl; A. Hocker; A. Holloway; S. Hou; M. Houlden; S.-C. Hsu; B. T. Huffman; R. E. Hughes; J. Huston; K. Ikado; J. Incandela; G. Introzzi; M. Iori; Y. Ishizawa; A. Ivanov; B. Iyutin; E. James; D. Jang; B. Jayatilaka; D. Jeans; H. Jensen; E. J. Jeon; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; T. Kamon; J. Kang; M. Karagoz-Unel; P. E. Karchin; Y. Kato; Y. Kemp; R. Kephart; U. Kerzel; V. Khotilovich; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; M. Kirby; L. Kirsch; S. Klimenko; M. Klute; B. Knuteson; B. R. Ko; H. Kobayashi; K. Kondo; D. J. Kong; J. Konigsberg; K. Kordas; A. Korytov; A. V. Kotwal; A. Kovalev; J. Kraus; I. Kravchenko; M. Kreps; A. Kreymer; J. Kroll; N. Krumnack; M. Kruse; V. Krutelyov; S. E. Kuhlmann; Y. Kusakabe; S. Kwang; A. T. Laasanen; S. Lai; S. Lami; S. Lammel; M. Lancaster; R. L. Lander; K. Lannon; A. Lath; G. Latino; I. Lazzizzera; C. Lecci; T. Lecompte; J. Lee; S. W. Lee; R. Lefèvre; N. Leonardo; S. Leone; S. Levy; J. D. Lewis; K. Li; C. Lin; M. Lindgren; E. Lipeles; T. M. Liss; A. Lister; D. O. Litvintsev; T. Liu; Y. Liu; N. S. Lockyer; A. Loginov; M. Loreti; P. Loverre; R.-S. Lu; D. Lucchesi; P. Lujan; P. Lukens; G. Lungu; L. Lyons; J. Lys; R. Lysak; E. Lytken; P. Mack; D. MacQueen; R. Madrak; K. Maeshima; P. Maksimovic; G. Manca; F. Margaroli; R. Marginean; C. Marino; A. Martin; M. Martin; V. Martin; M. Martínez; T. Maruyama; H. Matsunaga; M. E. Mattson; R. Mazini; P. Mazzanti; K. S. McFarland; D. McGivern; P. McIntyre; P. McNamara; R. McNulty; A. Mehta; S. Menzemer; A. Menzione; P. Merkel; C. Mesropian; A. Messina; M. von der Mey; T. Miao; N. Miladinovic; J. Miles; R. Miller; J. S. Miller; C. Mills; M. Milnik; R. Miquel; S. Miscetti; G. Mitselmakher; A. Miyamoto; N. Moggi; B. Mohr; R. Moore; M. Morello; P. Movilla Fernandez; J. Mülmenstädt; A. Mukherjee; M. Mulhearn; Th. Muller; R. Mumford; P. Murat; J. Nachtman; S. Nahn; I. Nakano; A. Napier; D. Naumov; V. Necula; C. Neu; M. S. Neubauer; J. Nielsen

    2005-01-01

    A search for new particles (X) that decay to electron or muon pairs has been performed using approximately 200pb-1 of p pmacr collision data at s=1.96TeV collected by the CDF II experiment at the Fermilab Tevatron. Limits on sigma(p pmacr -->X)BR(X-->ll) are presented as a function of dilepton invariant mass mll>150GeV\\/c2, for different spin hypotheses (0, 1, or 2). The

  10. Search for new high-mass particles decaying to Lepton pairs in p(p)over-bar collisions at root s=1.96 TeV

    Microsoft Academic Search

    A. Abulencia; D. Acosta; J. Adelman; T. Affolder; T. Akimoto; M. G. Albrow; D. Ambrose; S. Amerio; D. Amidei; A. Anastassov; K. Anikeev; A. Annovi; J. Antos; M. Aoki; G. Apollinari; J. F. Arguin; T. Arisawa; A. Artikov; W. Ashmanskas; A. Attal; F. Azfar; P. Azzi-Bacchetta; P. Azzurri; N. Bacchetta; H. Bachacou; W. Badgett; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; S. Baroiant; V. Bartsch; G. Bauer; F. Bedeschi; S. Behari; S. Belforte; G. Bellettini; J. Bellinger; A. Belloni; E. Ben-Haim; D. Benjamin; A. Beretvas; J. Beringer; T. Berry; A. Bhatti; M. Binkley; D. Bisello; M. Bishai; R. E. Blair; C. Blocker; K. Bloom; B. Blumenfeld; A. Bocci; A. Bodek; V. Boisvert; G. Bolla; A. Bolshov; D. Bortoletto; J. Boudreau; S. Bourov; A. Boveia; B. Brau; C. Bromberg; E. Brubaker; J. Budagov; H. S. Budd; S. Budd; K. Burkett; G. Busetto; P. Bussey; K. L. Byrum; S. Cabrera; M. Campanelli; M. Campbell; F. Canelli; A. Canepa; D. Carlsmith; R. Carosi; S. Carron; M. Casarsa; A. Castro; P. Catastini; D. Cauz; M. Cavalli-Sforza; A. Cerri; L. Cerrito; S. H. Chang; J. Chapman; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; F. Chlebana; I. Cho; K. Cho; D. Chokheli; J. P. Chou; P. H. Chu; S. H. Chuang; K. Chung; W. H. Chung; Y. S. Chung; M. Ciljak; C. I. Ciobanu; M. A. Ciocci; A. Clark; D. Clark; M. Coca; A. Connolly; M. E. Convery; J. Conway; B. Cooper; K. Copic; M. Cordelli; G. Cortiana; A. Cruz; J. Cuevas; R. Culbertson; D. Cyr; S. DaRonco; S. DAuria; M. Donofrio; D. Dagenhart; P. de Barbaro; S. De Cecco; A. Deisher; G. De Lentdecker; M. DellOrso; S. Demers; L. Demortier; J. Deng; M. Deninno; D. De Pedis; P. F. Derwent; C. Dionisi; J. R. Dittmann; P. DiTuro; C. Dorr; A. Dominguez; S. Donati; M. Donega; P. Dong; J. Donini; T. Dorigo; S. Dube; K. Ebina; J. Efron; J. Ehlers; R. Erbacher; D. Errede; S. Errede; R. Eusebi; H. C. Fang; S. Farrington; I. Fedorko; W. T. Fedorko; R. G. Feild; M. Feindt; J. P. Fernandez; R. Field; G. Flanagan; L. R. Flores-Castillo; A. Foland; S. Forrester; G. W. Foster; M. Franklin; J. C. Freeman; Y. Fujii; I. Furic; A. Gajjar; M. Gallinaro; J. Galyardt; J. E. Garcia; M. Garcia Sciveres; A. F. Garfinkel; C. Gay; H. Gerberich; E. Gerchtein; D. Gerdes; S. Giagu; P. Giannetti; A. Gibson; K. Gibson; C. Ginsburg; K. Giolo; M. Giordani; M. Giunta; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; N. Goldschmidt; J. Goldstein; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzalez; I. Gorelov; A. T. Goshaw; Y. Gotra; K. Goulianos; A. Gresele; M. Griffiths; S. Grinstein; C. Grosso-Pilcher; U. Grundler; J. Guimaraes da Costa; C. Haber; S. R. Hahn; K. Hahn; E. Halkiadakis; B. Y. Han; R. Handler; F. Happacher; K. Hara; M. Hare; S. Harper; R. F. Harr; R. M. Harris; K. Hatakeyama; J. Hauser; C. Hays; H. Hayward; A. Heijboer; B. Heinemann; J. Heinrich; M. Hennecke; M. Herndon; J. Heuser; D. Hidas; C. S. Hill; D. Hirschbuehl; A. Hocker; A. Holloway; S. Hou; M. Houlden; S. C. Hsu; B. T. Huffman; R. E. Hughes; J. Huston; K. Ikado; J. Incandela; G. Introzzi; M. Iori; Y. Ishizawa; A. Ivanov; B. Iyutin; E. James; D. Jang; B. Jayatilaka; D. Jeans; H. Jensen; E. J. Jeon; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; T. Kamon; J. Kang; M. Karagoz-Unel; P. E. Karchin; Y. Kato; Y. Kemp; R. Kephart; U. Kerzel; V. Khotilovich; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; M. Kirby; L. Kirsch; S. Klimenko; M. Klute; B. Knuteson; B. R. Ko; H. Kobayashi; K. Kondo; D. J. Kong; J. Konigsberg; K. Kordas; A. Korytov; A. V. Kotwal; A. Kovalev; J. Kraus; I. Kravchenko; M. Kreps; A. Kreymer; J. Kroll; N. Krumnack; M. Kruse; V. Krutelyov; S. E. Kuhlmann; Y. Kusakabe; S. Kwang; A. T. Laasanen; S. Lai; S. Lami; S. Lammel; M. Lancaster; R. L. Lander; K. Lannon; A. Lath; G. Latino; I. Lazzizzera; C. Lecci; T. LeCompte; J. Lee; S. W. Lee; R. Lefevre; N. Leonardo; S. Leone; S. Levy; J. D. Lewis; K. Li; C. Lin; M. Lindgren; E. Lipeles; T. M. Liss; A. Lister; D. O. Litvintsev; T. Liu; Y. Liu; N. S. Lockyer; A. Loginov; M. Loreti; P. Loverre; R. S. Lu; D. Lucchesi; P. Lujan; P. Lukens; G. Lungu; L. Lyons; J. Lys; R. Lysak; E. Lytken; P. Mack; D. MacQueen; R. Madrak; K. Maeshima; P. Maksimovic; G. Manca; F. Margaroli; R. Marginean; C. Marino; A. Martin; M. Martin; V. Martin; M. Martinez; T. Maruyama; H. Matsunaga; M. E. Mattson; R. Mazini; P. Mazzanti; K. S. McFarland; D. McGivern; P. McIntyre; P. McNamara; R. McNulty; A. Mehta; S. Menzemer; A. Menzione; P. Merkel; C. Mesropian; A. Messina; M. von der Mey; T. Miao; N. Miladinovic; J. Miles; R. Miller; J. S. Miller; C. Mills; M. Milnik; R. Miquel; S. Miscetti; G. Mitselmakher; A. Miyamoto; N. Moggi; B. Mohr; R. Moore; M. Morello; P. Movilla Fernandez; J. Mulmenstadt; A. Mukherjee; M. Mulhearn; T. Muller; R. Mumford; P. Murat; J. Nachtman; S. Nahn; I. Nakano; A. Napier; D. Naumov; V. Necula; C. Neu; M. S. Neubauer; J. Nielsen; T. Nigmanov

    2005-01-01

    A search for new particles (X) that decay to electron or muon pairs has been performed using approximately 200 pb(-1) of p (p) over bar collision data at root s =1.96 TeV collected by the CDF II experiment at the Fermilab Tevatron. Limits on sigma(p (p) over bar -> X)BR(X ->center dot center dot) are presented as a function of

  11. Observation of two charged bottomoniumlike resonances in ?(5S) decays.

    PubMed

    Bondar, A; Garmash, A; Mizuk, R; Santel, D; Kinoshita, K; Adachi, I; Aihara, H; Arinstein, K; Asner, D M; Aushev, T; Aziz, T; Bakich, A M; Barberio, E; Belous, K; Bhardwaj, V; Bischofberger, M; Bozek, A; Bra?ko, M; Browder, T E; Chang, M-C; Chang, P; Chen, A; Cheon, B G; Chilikin, K; Chistov, R; Cho, I-S; Cho, K; Choi, S-K; Choi, Y; Dalseno, J; Danilov, M; Doležal, Z; Drutskoy, A; Eidelman, S; Epifanov, D; Fast, J E; Gaur, V; Gabyshev, N; Goh, Y M; Golob, B; Haba, J; Hara, T; Hayasaka, K; Hoshi, Y; Hyun, H J; Iijima, T; Inami, K; Ishikawa, A; Iwabuchi, M; Iwasaki, Y; Iwashita, T; Julius, T; Kang, J H; Kawasaki, T; Kichimi, H; Kiesling, C; Kim, J B; Kim, J H; Kim, K T; Kim, M J; Kim, Y J; Ko, B R; Kobayashi, N; Koblitz, S; Kodyš, P; Korpar, S; Križan, P; Kuhr, T; Kumar, R; Kumita, T; Kuzmin, A; Lange, J S; Lee, S-H; Li, J; Li, Y; Libby, J; Liu, C; Liu, Z Q; Liventsev, D; Louvot, R; Matvienko, D; McOnie, S; Miyata, H; Miyazaki, Y; Mohanty, G B; Moll, A; Muramatsu, N; Mussa, R; Nakao, M; Natkaniec, Z; Neubauer, S; Niiyama, M; Nishida, S; Nishimura, K; Nitoh, O; Nozaki, T; Olsen, S L; Onuki, Y; Pakhlov, P; Pakhlova, G; Park, H; Park, H K; Pedlar, T K; Petri?, M; Piilonen, L E; Poluektov, A; Prim, M; Ritter, M; Röhrken, M; Ryu, S; Sahoo, H; Sakai, Y; Santel, D; Sanuki, T; Schneider, O; Schwanda, C; Senyo, K; Sevior, M E; Shapkin, M; Shebalin, V; Shibata, T-A; Shiu, J-G; Shwartz, B; Simon, F; Smerkol, P; Sohn, Y-S; Sokolov, A; Solovieva, E; Stari?, M; Sumihama, M; Sumiyoshi, T; Tanaka, S; Tatishvili, G; Teramoto, Y; Tikhomirov, I; Uchida, M; Uehara, S; Uglov, T; Ushiroda, Y; Vahsen, S E; Varner, G; Vinokurova, A; Wang, C H; Wang, M-Z; Wang, P; Wang, X L; Watanabe, Y; Williams, K M; Won, E; Yabsley, B D; Yamashita, Y; Yamauchi, M; Yuan, C Z; Yusa, Y; Zhang, Z P; Zhilich, V; Zhulanov, V; Zupanc, A; Zyukova, O

    2012-03-23

    We report the observation of two narrow structures in the mass spectra of the ?(±)?(nS) (n=1, 2, 3) and ?(±)h(b)(mP) (m=1, 2) pairs that are produced in association with a single charged pion in ?(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M(1)=(10,607.2±2.0)??MeV/c2, ?(1)=(18.4±2.4)??MeV, and M(2)=(10,652.2±1.5)??MeV/c2, ?(2)=(11.5±2.2)??MeV. The results are obtained with a 121.4??fb(-1) data sample collected with the Belle detector in the vicinity of the ?(5S) resonance at the KEKB asymmetric-energy e+ e- collider. PMID:22540572

  12. Exploiting Spin Echo Decay in the Detection of Nuclear Quadrupole Resonance Signals

    Microsoft Academic Search

    Samuel D. Somasundaram; Andreas Jakobsson; John A. S. Smith; Kaspar Althoefer

    2007-01-01

    Nuclear quadrupole resonance (NQR) is a radio-frequency technique that can be used to detect the presence of quadrupolar nuclei, such as the 14N nucleus prevalent in many explosives and narcotics. In a typical application, one observes trains of decaying NQR echoes, in which the decay is governed by the spin echo decay time(s) of the resonant line(s). In most detection

  13. Theoretical investigation of the decay of the N (2120 ) resonance to nucleon resonances near 1.7 GeV

    NASA Astrophysics Data System (ADS)

    Huang, Yin; He, Jun; Chen, Xu-Rong; Wang, Rong; Xie, Ju-Jun; Zhang, Hong-Fei

    2015-06-01

    Background: Until now the knowledge about nucleon resonances with a mass higher than 2 GeV has been scarce. Huge amounts of experimental data of the multipion photoproduction have been accumulated, and more can be expected in the future in facilities such as JLab 12 GeV. It makes it possible to investigate the decay of a nucleon resonance into another nucleon resonance. Purpose: The possibility to research the decay of the N (2120 ) to nucleon resonances near 1.7 GeV in the three-pion photoproduction will be explored to provide useful information for future experimental study. Method: The pion and radiative decay amplitudes of nucleon resonances are studied within the constituent quark model, which is used to calculate the couplings constants, especially for the decay of a nucleon resonance near 2.1 GeV to another nucleon resonance near 1.7 GeV. The three-pion photoproduction off the neutron target, i.e.,? n ??-?-?++??-?-?+p , is investigated based on the effective Lagrangian method with the coupling constant obtained form the decay amplitudes. Results: The resonance contribution with a state N (2PM) 3/2- near 2.1 GeV decaying to a state N (4PM) 5/2- near 1.7 GeV, i.e., N (2120 )?N (1675 )? , is dominant in the process considered. The total cross section from the resonance contribution is at the order of 1 ? b and can be easily distinguished from the background. Conclusions: Our results suggest it is practicable to research the decay of the N (2120 ) to the N (1675 ) in experiment.

  14. Excitation and photon decay of giant resonances excited by intermediate energy heavy ions

    SciTech Connect

    Bertrand, F.E.; Beene, J.R.

    1987-01-01

    Inelastic scattering of medium energy heavy ions provides very large cross sections and peak-to-continuum ratios for excitation of giant resonances. For energies above about 50 MeV/nucleon, giant resonances are excited primarily through Coulomb excitation, which is indifferent to isospin, thus providing a good probe for the study of isovector giant resonances. The extremely large cross sections available from heavy ion excitation permit the study of rare decay modes of the giant resonances. In particular, recent measurements have been made of the photon decay of giant resonances following excitation by 22 and 84 MeV/nucleon /sup 17/O projectiles. The singles results at 84 MeV/nucleon yield peak cross sections for the isoscalar giant quadrupole resonance and the isovector giant dipole resonance of approximately 0.8 and 3 barns/sr, respectively. Data on the ground state decay of the isoscalar giant quadrupole and isovector giant dipole resonances are presented and compared with calculations. Decays to low-lying excited states are also discussed. Preliminary results from an experiment to isolate the /sup 208/Pb isovector quadrupole resonance using its gamma decay are presented. 22 refs., 19 figs., 1 tab.

  15. Triple charged-particle decays of resonances illustrated by 12C-states

    E-print Network

    R. Alvarez-Rodriguez; E. Garrido; A. S. Jensen; D. V. Fedorov; H. O. U. Fynbo

    2007-09-28

    The hyperspherical adiabatic expansion is combined with complex scaling and used to calculate the energy distributions of the particles arising from three-body decaying low-lying $^{12}$C resonances. The large distance continuum properties of the wavefunctions are crucial and must be accurately calculated. The substantial changes from small to large distances determine the decay mechanisms. We illustrate by computing the energy distributions from decays of the $1^{-}$, $2^-$ and $4^{-}$-resonances in $^{12}$C. These states are dominated by sequential ($1^-$), through the $^{8}$Be ground state, and direct ($2^-$, $4^-$) decays.

  16. Observation of a resonance in B+ ? K+ ?+ ?- decays at low recoil.

    PubMed

    Aaij, R; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves, A A; Amato, S; Amerio, S; Amhis, Y; Anderlini, L; Anderson, J; Andreassen, R; Andrews, J E; Appleby, R B; Aquines Gutierrez, O; Archilli, F; Artamonov, A; Artuso, M; Aslanides, E; Auriemma, G; Baalouch, M; Bachmann, S; Back, J J; Baesso, C; Balagura, V; Baldini, W; Barlow, R J; Barschel, C; Barsuk, S; Barter, W; Bauer, Th; Bay, A; Beddow, J; Bedeschi, F; Bediaga, I; Belogurov, S; Belous, K; Belyaev, I; Ben-Haim, E; Bencivenni, G; Benson, S; Benton, J; Berezhnoy, A; Bernet, R; Bettler, M-O; van Beuzekom, M; Bien, A; Bifani, S; Bird, T; Bizzeti, A; Bjørnstad, P M; Blake, T; Blanc, F; Blouw, J; Blusk, S; Bocci, V; Bondar, A; Bondar, N; Bonivento, W; Borghi, S; Borgia, A; Bowcock, T J V; Bowen, E; Bozzi, C; Brambach, T; van den Brand, J; Bressieux, J; Brett, D; Britsch, M; Britton, T; Brook, N H; Brown, H; Burducea, I; Bursche, A; Busetto, G; Buytaert, J; Cadeddu, S; Callot, O; Calvi, M; Calvo Gomez, M; Camboni, A; Campana, P; Campora Perez, D; Carbone, A; Carboni, G; Cardinale, R; Cardini, A; Carranza-Mejia, H; Carson, L; Carvalho Akiba, K; Casse, G; Castillo Garcia, L; Cattaneo, M; Cauet, Ch; Cenci, R; Charles, M; Charpentier, Ph; Chen, P; Chiapolini, N; Chrzaszcz, M; Ciba, K; Cid Vidal, X; Ciezarek, G; Clarke, P E L; Clemencic, M; Cliff, H V; Closier, J; Coca, C; Coco, V; Cogan, J; Cogneras, E; Collins, P; Comerma-Montells, A; Contu, A; Cook, A; Coombes, M; Coquereau, S; Corti, G; Couturier, B; Cowan, G A; Cowie, E; Craik, D C; Cunliffe, S; Currie, R; D'Ambrosio, C; David, P; David, P N Y; Davis, A; De Bonis, I; De Bruyn, K; De Capua, S; De Cian, M; De Miranda, J M; De Paula, L; De Silva, W; De Simone, P; Decamp, D; Deckenhoff, M; Del Buono, L; Déléage, N; Derkach, D; Deschamps, O; Dettori, F; Di Canto, A; Dijkstra, H; Dogaru, M; Donleavy, S; Dordei, F; Dosil Suárez, A; Dossett, D; Dovbnya, A; Dupertuis, F; Durante, P; Dzhelyadin, R; Dziurda, A; Dzyuba, A; Easo, S; Egede, U; Egorychev, V; Eidelman, S; van Eijk, D; Eisenhardt, S; Eitschberger, U; Ekelhof, R; Eklund, L; El Rifai, I; Elsasser, Ch; Falabella, A; Färber, C; Fardell, G; Farinelli, C; Farry, S; Ferguson, D; Fernandez Albor, V; Ferreira Rodrigues, F; Ferro-Luzzi, M; Filippov, S; Fiore, M; Fitzpatrick, C; Fontana, M; Fontanelli, F; Forty, R; Francisco, O; Frank, M; Frei, C; Frosini, M; Furcas, S; Furfaro, E; Gallas Torreira, A; Galli, D; Gandelman, M; Gandini, P; Gao, Y; Garofoli, J; Garosi, P; Garra Tico, J; Garrido, L; Gaspar, C; Gauld, R; Gersabeck, E; Gersabeck, M; Gershon, T; Ghez, Ph; Gibson, V; Giubega, L; Gligorov, V V; Göbel, C; Golubkov, D; Golutvin, A; Gomes, A; Gorbounov, P; Gordon, H; Gotti, C; Grabalosa Gándara, M; Graciani Diaz, R; Granado Cardoso, L A; Graugés, E; Graziani, G; Grecu, A; Greening, E; Gregson, S; Griffith, P; Grünberg, O; Gui, B; Gushchin, E; Guz, Yu; Gys, T; Hadjivasiliou, C; Haefeli, G; Haen, C; Haines, S C; Hall, S; Hamilton, B; Hampson, T; Hansmann-Menzemer, S; Harnew, N; Harnew, S T; Harrison, J; Hartmann, T; He, J; Head, T; Heijne, V; Hennessy, K; Henrard, P; Hernando Morata, J A; van Herwijnen, E; Hess, M; Hicheur, A; Hicks, E; Hill, D; Hoballah, M; Hombach, C; Hopchev, P; Hulsbergen, W; Hunt, P; Huse, T; Hussain, N; Hutchcroft, D; Hynds, D; Iakovenko, V; Idzik, M; Ilten, P; Jacobsson, R; Jaeger, A; Jans, E; Jaton, P; Jawahery, A; Jing, F; John, M; Johnson, D; Jones, C R; Joram, C; Jost, B; Kaballo, M; Kandybei, S; Kanso, W; Karacson, M; Karbach, T M; Kenyon, I R; Ketel, T; Keune, A; Khanji, B; Kochebina, O; Komarov, I; Koopman, R F; Koppenburg, P; Korolev, M; Kozlinskiy, A; Kravchuk, L; Kreplin, K; Kreps, M; Krocker, G; Krokovny, P; Kruse, F; Kucharczyk, M; Kudryavtsev, V; Kurek, K; Kvaratskheliya, T; La Thi, V N; Lacarrere, D; Lafferty, G; Lai, A; Lambert, D; Lambert, R W; Lanciotti, E; Lanfranchi, G; Langenbruch, C; Latham, T; Lazzeroni, C; Le Gac, R; van Leerdam, J; Lees, J-P; Lefèvre, R; Leflat, A; Lefrançois, J; Leo, S; Leroy, O; Lesiak, T; Leverington, B; Li, Y; Li Gioi, L; Liles, M; Lindner, R; Linn, C; Liu, B; Liu, G; Lohn, S; Longstaff, I; Lopes, J H; Lopez-March, N; Lu, H; Lucchesi, D; Luisier, J; Luo, H; Machefert, F; Machikhiliyan, I V; Maciuc, F; Maev, O; Malde, S; Manca, G; Mancinelli, G; Maratas, J; Marconi, U; Marino, P; Märki, R; Marks, J; Martellotti, G; Martens, A; Martín Sánchez, A; Martinelli, M; Martinez Santos, D; Martins Tostes, D; Martynov, A; Massafferri, A; Matev, R; Mathe, Z; Matteuzzi, C; Maurice, E; Mazurov, A; McCarthy, J; McNab, A; McNulty, R; McSkelly, B; Meadows, B; Meier, F; Meissner, M; Merk, M; Milanes, D A; Minard, M-N; Molina Rodriguez, J; Monteil, S; Moran, D; Morawski, P; Mordà, A; Morello, M J; Mountain, R; Mous, I; Muheim, F; Müller, K; Muresan, R; Muryn, B; Muster, B

    2013-09-13

    A broad peaking structure is observed in the dimuon spectrum of B+ ? K+ ?+ ?- decays in the kinematic region where the kaon has a low recoil against the dimuon system. The structure is consistent with interference between the B+ ? K+ ?+ ?- decay and a resonance and has a statistical significance exceeding six standard deviations. The mean and width of the resonance are measured to be 4191(-8)(+9)??MeV/c2 and 65(-16)(+22)??MeV/c2, respectively, where the uncertainties include statistical and systematic contributions. These measurements are compatible with the properties of the ?(4160) meson. First observations of both the decay B+ ? ?(4160)K+ and the subsequent decay ?(4160) ? ?+ ?- are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770??MeV/c2. This contribution is larger than theoretical estimates. PMID:24074076

  17. Search for a narrow resonance in Z 0 decays into hadrons and isolated photons

    Microsoft Academic Search

    G. Alexander; J. Allison; N. Altekamp; K. Ametewee; K. J. Anderson; S. Anderson; S. Arcelli; S. Asai; D. Axen; G. Azuelos; A. H. Ball; E. Barberio; R. J. Barlow; R. Bartoldus; J. R. Batley; G. Beaudoin; J. Bechtluft; C. Beeston; T. Behnke; A. N. Bell; K. W. Bell; G. Bella; S. Bentvelsen; P. Berlich; S. Bethke; O. Biebel; V. Blobel; I. J. Bloodworth; J. E. Bloomer; P. Bock; H. M. Bosch; M. Boutemeur; B. T. Bouwens; S. Braibant; P. Bright-Thomas; R. M. Brown; H. J. Burckhart; C. Burgard; R. Bürgin; P. Capiluppi; R. K. Carnegie; A. A. Carter; J. R. Carter; C. Y. Chang; C. Charlesworth; D. G. Charlton; D. Chrisman; S. L. Chu; P. E. L. Clarke; S. G. Clowes; I. Cohen; J. E. Conboy; O. C. Cooke; M. Cuffiani; S. Dado; C. Dallapiccola; G. M. Dallavalle; C. Darling; S. De Jong; L. A. del Pozo; M. S. Dixit; E. do Couto e Silva; E. Duchovni; G. Duckeck; I. P. Duerdoth; J. E. G. Edwards; P. G. Estabrooks; H. G. Evans; M. Evans; F. Fabbri; P. Fath; F. Fiedler; M. Fierro; H. M. Fischer; R. Folman; D. G. Fong; M. Foucher; H. Fukui; A. Fürtjes; P. Gagnon; A. Gaidot; J. W. Gary; J. Gascon; S. M. Gascon-Shotkin; N. I. Geddes; C. Geich-Gimbel; S. W. Gensler; F. X. Gentit; T. Geralis; G. Giacomelli; P. Giacomelli; R. Giacomelli; V. Gibson; W. R. Gibson; D. M. Gingrich; J. Goldberg; M. J. Goodrick; W. Gorn; C. Grandi; E. Gross; M. Gruwé; C. Hajdu; G. G. Hanson; M. Hansroul; M. Hapke; C. K. Hargrove; P. A. Hart; C. Hartmann; M. Hauschild; C. M. Hawkes; R. Hawkings; R. J. Hemingway; G. Herten; R. D. Heuer; M. D. Hildreth; J. C. Hill; S. J. Hillier; T. Hilse; P. R. Hobson; R. J. Homer; A. K. Honma; D. Horváth; R. Howard; R. E. Hughes-Jones; D. E. Hutchcroft; P. Igo-Kemenes; D. C. Imrie; A. Jawahery; P. W. Jeffreys; H. Jeremie; M. Jimack; A. Joly; M. Jones; R. W. L. Jones; U. Jost; P. Jovanovic; J. Kanzaki; D. Karlen; T. Kawamoto; R. K. Keeler; R. G. Kellogg; B. W. Kennedy; J. King; J. Kirk; S. Kluth; T. Kobayashi; M. Kobel; D. S. Koetke; T. P. Kokott; S. Komamiya; R. Kowalewski; T. Kress; P. Krieger; J. von Krogh; P. Kyberd; G. D. Lafferty; H. Lafoux; R. Lahmann; W. P. Lai; D. Lanske; J. Lauber; J. G. Layter; A. M. Lee; E. Lefebvre; D. Lellouch; J. Letts; L. Levinson; C. Lewis; S. L. Lloyd; F. K. Loebinger; G. D. Long; B. Lorazo; M. J. Losty; J. Ludwig; A. Luig; A. Malik; M. Mannelli; S. Marcellini; C. Markus; A. J. Martin; J. P. Martin; G. Martinez; T. Mashimo; W. Matthews; P. Mättig; W. J. McDonald; J. McKenna; E. A. Mckigney; T. J. McMahon; A. I. McNab; F. Meijers; S. Menke; F. S. Merritt; H. Mes; J. Meyer; A. Michelini; G. Mikenberg; D. J. Miller; R. Mir; W. Mohr; A. Montanari; T. Mori; M. Morii; U. Müller; B. Nellen; B. Nijjhar; R. Nisius; S. W. O’Neale; F. G. Oakham; F. Odorici; H. O. Ogren; N. J. Oldershaw; T. Omori; M. J. Oreglia; S. Orito; M. Palazzo; J. Pálinkás; F. M. Palmonari; J. P. Pansart; G. Pásztor; J. R. Pater; G. N. Patrick; M. J. Pearce; S. Petzold; P. D. Phillips; J. E. Pilcher; J. Pinfold; D. E. Plane; P. Poffenberger; B. Poli; A. Posthaus; H. Przysiezniak; D. L. Rees; D. Rigby; M. G. Rison; S. A. Robins; N. Rodning; J. M. Roney; E. Ros; A. M. Rossi; M. Rosvick; P. Routenburg; Y. Rozen; K. Runge; O. Runolfsson; D. R. Rust; R. Rylko; E. K. G. Sarkisyan; M. Sasaki; C. Sbarra; A. D. Schaile; O. Schaile; F. Scharf; P. Scharff-Hansen; P. Schenk; B. Schmitt; M. Schröder; H. C. Schultz-Coulon; M. Schulz; P. Schütz; J. Schwiening; W. G. Scott; T. G. Shears; B. C. Shen; C. H. Shepherd-Themistocleous; P. Sherwood; G. P. Siroli; A. Sittler; A. Skillman; A. Skuja; A. M. Smith; T. J. Smith; G. A. Snow; R. Sobie; S. Söldner-Rembold; R. W. Springer; M. Sproston; A. Stahl; M. Starks; K. Stephens; J. Steuerer; B. Stockhausen; D. Strom; F. Strumia; P. Szymanski; R. Tafirout; H. Takeda; P. Taras; S. Tarem; M. Tecchio; N. Tesch; M. Thiergen; M. A. Thomson; E. von Törne; S. Towers; M. Tscheulin; E. Tsur; A. S. Turcot; M. F. Turner-Watson; P. Utzat; R. Van Kooten; G. Vasseur; M. Verzocchi; P. Vikas; M. Vincter; E. H. Vokurka; F. Wäckerle; A. Wagner; C. P. Ward; D. R. Ward; J. J. Ward; P. M. Watkins; A. T. Watson; N. K. Watson; P. Weber; P. S. Wells; N. Wermes; J. S. White; B. Wilkens; G. W. Wilson; J. A. Wilson; T. Wlodek; G. Wolf; S. Wotton; T. R. Wyatt; S. Xella; S. Yamashita; G. Yekutieli; K. Yoshimura; V. Zacek

    1996-01-01

    A search for the hadronic decay of a hypothetical resonance S0 in the process e+e??? + hadrons at Z0 energies is reported. Particular care is taken to optimise the sensitivity to a scalar resonance decaying into bottom quarks,\\u000a as expected for Higgs production, e+e??Z0?H0\\u000a ? with$$H^0 \\\\to b\\\\bar b$$, in the Standard Model or some of its extensions. No evidence

  18. Beta decay of 103In: Evidence for the Gamow-Teller resonance near 100Sn

    Microsoft Academic Search

    M. Karny; L K Batist; B. A. Brown; D. Cano-Ott; R. Collatz; A. Gadea; R. Grzywacz; A. Guglielmetti; M. Hellström; Z. Hu; Z. Janas; R. Kirchner; F. Moroz; A. Piechaczek; A. Pl Ochocki; E. Roeckl; B. Rubio; K. Rykaczewski; M. Shibata; J. Szerypo; J. L. Tain; V. Wittmann; A. Wöhr

    1998-01-01

    The ? decay of the neutron-deficient isotope 103In was investigated by using total absorption ?-ray spectrometry on mass-separated sources. The measurement reveals a high-lying resonance of the ?-decay strength in striking disagreement with high-resolution ?-ray data. The result is discussed in comparison with shell-model predictions.

  19. Non-resonant contribution in non-leptonic charm meson decays

    SciTech Connect

    Bediaga, I.; Goebel, C.; Mendez-Galain, R. [Centro Brasileiro de Pesquisas Fisicas, R. Dr. Xavier Sigaud 150 22290-180-Rio de Janeiro, RJ (Brazil); Instituto de Fisica, Facultad de Ingenieria, CC 30, CP 11000 Montevideo (Uruguay)

    1997-03-15

    We claim that the non-resonant contribution to non-leptonic charm meson decays cannot be considered constant in the phase space of the reaction as it usually is. We discuss as an example the decay D{sup +}{yields}K{sup -}{pi}{sup +}{pi}{sup +}.

  20. Search for Exclusive Multibody Non-DD¯ Decays at the psi(3770) Resonance

    Microsoft Academic Search

    G. S. Huang; D. H. Miller; V. Pavlunin; B. Sanghi; I. P. J. Shipsey; G. S. Adams; M. Cravey; J. P. Cummings; I. Danko; J. Napolitano; Q. He; H. Muramatsu; C. S. Park; E. H. Thorndike; T. E. Coan; Y. S. Gao; F. Liu; M. Artuso; C. Boulahouache; S. Blusk; J. Butt; O. Dorjkhaidav; J. Li; N. Menaa; R. Nandakumar; K. Randrianarivony; R. Redjimi; R. Sia; T. Skwarnicki; S. Stone; J. C. Wang; K. Zhang; S. E. Csorna; G. Bonvicini; D. Cinabro; M. Dubrovin; R. A. Briere; G. P. Chen; J. Chen; T. Ferguson; G. Tatishvili; H. Vogel; M. E. Watkins; J. L. Rosner; N. E. Adam; J. P. Alexander; K. Berkelman; D. G. Cassel; V. Crede; J. E. Duboscq; K. M. Ecklund; R. Ehrlich; L. Fields; R. S. Galik; L. Gibbons; B. Gittelman; R. Gray; S. W. Gray; D. L. Hartill; B. K. Heltsley; D. Hertz; C. D. Jones; J. Kandaswamy; D. L. Kreinick; V. E. Kuznetsov; H. Mahlke-Krüger; T. O. Meyer; P. U. E. Onyisi; J. R. Patterson; D. Peterson; E. A. Phillips; J. Pivarski; D. Riley; A. Ryd; A. J. Sadoff; H. Schwarthoff; X. Shi; M. R. Shepherd; S. Stroiney; W. M. Sun; D. Urner; T. Wilksen; K. M. Weaver; M. Weinberger; S. B. Athar; P. Avery; L. Breva-Newell; R. Patel; V. Potlia; H. Stoeck; J. Yelton; P. Rubin; C. Cawlfield; B. I. Eisenstein; G. D. Gollin; I. Karliner; D. Kim; N. Lowrey; P. Naik; C. Sedlack; M. Selen; E. J. White; J. Williams; J. Wiss; K. W. Edwards; D. Besson; T. K. Pedlar; D. Cronin-Hennessy; K. Y. Gao; D. T. Gong; J. Hietala; Y. Kubota; T. Klein; B. W. Lang; S. Z. Li; R. Poling; A. W. Scott; A. Smith; S. Dobbs; Z. Metreveli; K. K. Seth; A. Tomaradze; P. Zweber; J. Ernst; H. Severini; D. M. Asner; S. A. Dytman; W. Love; S. Mehrabyan; J. A. Mueller; V. Savinov; Z. Li; A. Lopez; H. Mendez; J. Ramirez

    2006-01-01

    Using data collected at the psi(3770) resonance with the CLEO-c detector at the Cornell e+e- storage ring, we present searches for 25 charmless decay modes of the psi(3770), mostly multibody final states. No evidence for charmless decays is found.

  1. Search for high-mass diboson resonances with boson-tagged jets in proton-proton collisions at $\\sqrt{s}$ = 8 TeV with the ATLAS detector

    E-print Network

    ATLAS Collaboration

    2015-06-15

    A search is performed for narrow resonances decaying into $WW$, $WZ$, or $ZZ$ boson pairs using 20.3 fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy of $\\sqrt{s}$ = 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. Diboson resonances with masses in the range from 1.3 to 3.0 TeV are sought after using the invariant mass distribution of dijets where both jets are tagged as a boson jet, compatible with a highly boosted $W$ or $Z$ boson decaying to quarks, using jet mass and substructure properties. The largest deviation from a smoothly falling background in the observed dijet invariant mass distribution occurs around 2 TeV in the $WZ$ channel, with a global significance of 2.5 standard deviations. Exclusion limits at the 95% confidence level are set on the production cross section times branching ratio for the $WZ$ final state of a new heavy gauge boson, $W'$, and for the $WW$ and $ZZ$ final states of Kaluza--Klein excitations of the graviton in a bulk Randall--Sundrum model, as a function of the resonance mass. $W'$ bosons with couplings predicted by the extended gauge model in the mass range from 1.3 to 1.5 TeV are excluded at 95% confidence level.

  2. S -wave resonance contributions to the B(s) 0?J /? ?+?- and Bs??+?-?+?- decays

    NASA Astrophysics Data System (ADS)

    Wang, Wen-Fei; Li, Hsiang-nan; Wang, Wei; Lü, Cai-Dian

    2015-05-01

    We study S -wave resonance contributions to the B(s) 0?J /? ?+?- and Bs??+?-?+?- decays in the perturbative QCD framework by introducing two-hadron distribution amplitudes for final states. The Breit-Wigner formula for the f0(500 ), f0(1500 ), and f0(1790 ) resonances and the Flatté model for the f0(980 ) resonance are adopted to parametrize the timelike scalar form factors in the two-pion distribution amplitudes, which include both resonant and nonresonant contributions. The resultant branching fraction and differential branching fraction in the pion-pair invariant mass for each resonance channel are consistent with experimental data. The determined S -wave two-pion distribution amplitudes, containing the information of both resonant and nonresonant rescattering phases, can be employed to predict direct C P asymmetries of other three-body hadronic B meson decays in various localized regions of two-pion phase space.

  3. Decay of a Jpi=36+ Resonance in the 24Mg + 24Mg Reaction

    Microsoft Academic Search

    M.-D. Salsac; F. Haas; S. Courtin; C. Beck; M. Rousseau; A. Sanchez I. Zafra; A. Algora; S. Beghini; B. R. Behera; R. Chapman; L. Corradi; Z. Dombradi; E. Farnea; E. Fioretto; A. Gadea; D. G. Jenkins; A. Latina; S. Lenzi; X. Liang; N. Marginean; G. Montagnoli; D. Napoli; P. Papka; I. Pokrovski; G. Pollarolo; F. Scarlassara; A. M. Stefanini; S. Szilner; M. Trotta; Z. M. Wang

    2005-01-01

    The narrow (Gamma=170 keV) and high spin (Jpi=36+) resonance in the 24Mg + 24Mg reaction at ECM= 45.7 MeV has been associated with a hyperdeformed molecular state in 48Cr. Such a description has important consequences for the resonance decay into the favored inelastic channels. Through fragment-gamma coincidence measurements performed ON and OFF resonance using the PRISMA-CLARA array, we have identified

  4. Nature and decay of a Jpi=36+ resonance in the 24Mg + 24Mg reaction

    Microsoft Academic Search

    M.-D. Salsac; F. Haas; S. Courtin; C. Beck; M. Rousseau; A. Sanchez I. Zafra; A. Algora; S. Beghini; B. R. Behera; R. Chapman; L. Corradi; Z. Dombradi; E. Farnea; E. Fioretto; A. Gadea; D. G. Jenkins; A. Latina; S. Lenzi; X. Liang; N. Marginean; G. Montagnoli; D. Napoli; P. Papka; I. Pokrovski; G. Pollarolo; F. Scarlassara; A. M. Stefanini; S. Szilner; M. Trotta; Z. M. Wang

    2006-01-01

    It has been proposed to associate the narrow (Gamma=170 keV) and high spin (Jpi=36+) resonance in the 24Mg + 24Mg reaction at Ec.m= 45.7 MeV with a hyperdeformed molecular state in 48Cr. Such a description has important consequences for the resonance decay into the favoured inelastic channels. Through fragment-gamma coincidence measurements performed ON and OFF resonance using the PRISMA-CLARA array,

  5. Role of five-quark components in radiative and strong decays of the ?(1405) resonance

    NASA Astrophysics Data System (ADS)

    An, C. S.; Saghai, B.; Yuan, S. G.; He, Jun

    2010-04-01

    Within an extended chiral constituent quark model, the three- and five-quark structure of the S01 resonance ?(1405) is investigated. Helicity amplitudes for electromagnetic decays [?(1405)??(1116)?, ?(1194)?] and transition amplitudes for strong decays [?(1405)??(1194)?, K-p] are derived, as well as the relevant decay widths. The experimental value for the strong decay width, ??(1405)?(??)°=50±2 MeV, is well reproduced with about 50% of a five-quark admixture in the ?(1405). Important effects owing to the configuration mixing among ?12PA, ?82PM, and ?84PM are found. In addition, transitions between the three- and the five-quark components in the baryons turn out to be significant in both radiative and strong decays of the ?(1405) resonance.

  6. Determination of compositeness of the ? (1405) resonance from its radiative decay

    NASA Astrophysics Data System (ADS)

    Sekihara, T.; Kumano, S.

    2014-02-01

    The radiative decay of ? (1405) is investigated from the viewpoint of compositeness, which corresponds to the amount of two-body states composing resonances as well as bound states. For a K¯N(I=0) bound state without couplings to other channels, we establish a relation between the radiative decay width and the compositeness. Especially the radiative decay width of the bound state is proportional to the compositeness. Applying the formulation to ? (1405), we observe that the decay to ?? is dominated by the K-p component inside ? (1405), because in this decay ?+?- and ?-?+ strongly cancel each other and the ?? component can contribute to the ?? decay only through the slight isospin breaking. This means that the decay ? (1405)??? is suitable for the study of the K¯N component in ? (1405). Fixing the ? (1405)-?? coupling constant from the usual decay of ? (1405)???, we show a relation between the absolute value of the K¯N compositeness for ? (1405) and the radiative decay width of ? (1405)??? and ?0?, and we find that large decay width to ?? implies large K ¯N compositeness for ? (1405). By using the "experimental" data on the radiative decay widths, which is based on an isobar model fitting of the K-p atom data, we estimate the K¯N compositeness for ? (1405). We also discuss the pole position dependence of our relation on the ? (1405) radiative decay width and the effects of the two-pole structure for ? (1405).

  7. Search for high-mass diboson resonances with boson-tagged jets in proton--proton collisions at $\\sqrt{s}$ = 8 TeV with the ATLAS detector

    E-print Network

    Aad, Georges; ATLAS Collaboration; Abdallah, Jalal; Abdinov, Ovsat; Aben, Rosemarie; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Abreu, Ricardo; Abulaiti, Yiming; Acharya, Bobby Samir; Adamczyk, Leszek; Adams, David; Adelman, Jahred; Adomeit, Stefanie; Adye, Tim; Affolder, Tony; Agatonovic-Jovin, Tatjana; Aguilar-Saavedra, Juan Antonio; Ahlen, Steven; Ahmadov, Faig; Aielli, Giulio; Akerstedt, Henrik; Åkesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Alberghi, Gian Luigi; Albert, Justin; Albrand, Solveig; Alconada Verzini, Maria Josefina; Aleksa, Martin; Aleksandrov, Igor; Alexa, Calin; Alexander, Gideon; Alexopoulos, Theodoros; Alhroob, Muhammad; Alimonti, Gianluca; Alio, Lion; Alison, John; Alkire, Steven Patrick; Allbrooke, Benedict; Allport, Phillip; Aloisio, Alberto; Alonso, Alejandro; Alonso, Francisco; Alpigiani, Cristiano; Altheimer, Andrew David; Alvarez Gonzalez, Barbara; ?lvarez Piqueras, Damián; Alviggi, Mariagrazia; Amadio, Brian Thomas; Amako, Katsuya; Amaral Coutinho, Yara; Amelung, Christoph; Amidei, Dante; Amor Dos Santos, Susana Patricia; Amorim, Antonio; Amoroso, Simone; Amram, Nir; Amundsen, Glenn; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anders, John Kenneth; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Angelidakis, Stylianos; Angelozzi, Ivan; Anger, Philipp; Angerami, Aaron; Anghinolfi, Francis; Anisenkov, Alexey; Anjos, Nuno; Annovi, Alberto; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoki, Masato; Aperio Bella, Ludovica; Arabidze, Giorgi; Arai, Yasuo; Araque, Juan Pedro; Arce, Ayana; Arduh, Francisco Anuar; Arguin, Jean-Francois; Argyropoulos, Spyridon; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnal, Vanessa; Arnold, Hannah; Arratia, Miguel; Arslan, Ozan; Artamonov, Andrei; Artoni, Giacomo; Asai, Shoji; Asbah, Nedaa; Ashkenazi, Adi; Åsman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astalos, Robert; Atkinson, Markus; Atlay, Naim Bora; Auerbach, Benjamin; Augsten, Kamil; Aurousseau, Mathieu; Avolio, Giuseppe; Axen, Bradley; Ayoub, Mohamad Kassem; Azuelos, Georges; Baak, Max; Baas, Alessandra; Bacci, Cesare; Bachacou, Henri; Bachas, Konstantinos; Backes, Moritz; Backhaus, Malte; Bagiacchi, Paolo; Bagnaia, Paolo; Bai, Yu; Bain, Travis; Baines, John; Baker, Oliver Keith; Balek, Petr; Balestri, Thomas; Balli, Fabrice; Banas, Elzbieta; Banerjee, Swagato; Bannoura, Arwa A E; Bansil, Hardeep Singh; Barak, Liron; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnes, Sarah Louise; Barnett, Bruce; Barnett, Michael; Barnovska, Zuzana; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimarães da Costa, João; Bartoldus, Rainer; Barton, Adam Edward; Bartos, Pavol; Basalaev, Artem; Bassalat, Ahmed; Basye, Austin; Bates, Richard; Batista, Santiago Juan; Batley, Richard; Battaglia, Marco; Bauce, Matteo; Bauer, Florian; Bawa, Harinder Singh; Beacham, James Baker; Beattie, Michael David; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Becker, Anne Kathrin; Becker, Maurice; Becker, Sebastian; Beckingham, Matthew; Becot, Cyril; Beddall, Andrew; Beddall, Ayda; Bednyakov, Vadim; Bee, Christopher; Beemster, Lars; Beermann, Thomas; Begel, Michael; Behr, Janna Katharina; Belanger-Champagne, Camille; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellerive, Alain; Bellomo, Massimiliano; Belotskiy, Konstantin; Beltramello, Olga; Benary, Odette; Benchekroun, Driss; Bender, Michael; Bendtz, Katarina; Benekos, Nektarios; Benhammou, Yan; Benhar Noccioli, Eleonora; Benitez Garcia, Jorge-Armando; Benjamin, Douglas; Bensinger, James; Bentvelsen, Stan; Beresford, Lydia; Beretta, Matteo; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Beringer, Jürg; Bernard, Clare; Bernard, Nathan Rogers; Bernius, Catrin; Bernlochner, Florian Urs; Berry, Tracey; Berta, Peter; Bertella, Claudia; Bertoli, Gabriele; Bertolucci, Federico; Bertsche, Carolyn; Bertsche, David; Besana, Maria Ilaria; Besjes, Geert-Jan; Bessidskaia Bylund, Olga; Bessner, Martin Florian; Besson, Nathalie; Betancourt, Christopher; Bethke, Siegfried; Bevan, Adrian John; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianchini, Louis; Bianco, Michele; Biebel, Otmar; Biedermann, Dustin; Bieniek, Stephen Paul; Biglietti, Michela; Bilbao De Mendizabal, Javier; Bilokon, Halina; Bindi, Marcello

    2015-01-01

    A search is performed for narrow resonances decaying into $WW$, $WZ$, or $ZZ$ boson pairs using 20.3 fb$^{-1}$ of proton--proton collision data at a centre-of-mass energy of $\\sqrt{s}$ = 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. Diboson resonances with masses in the range from 1.3 to 3.0 TeV are sought after using the invariant mass distribution of dijets where both jets are tagged as a boson jet, compatible with a highly boosted $W$ or $Z$ boson decaying to quarks, using jet mass and substructure properties. The largest deviation from a smoothly falling background in the observed dijet invariant mass distribution occurs around 2 TeV in the $WZ$ channel, with a global significance of 2.5 standard deviations. Exclusion limits at the 95% confidence level are set on the production cross section times branching ratio for the $WZ$ final state of a new heavy gauge boson, $W'$, and for the $WW$ and $ZZ$ final states of Kaluza--Klein excitations of the graviton in a bulk Randall--Sundrum...

  8. Decay of a Resonance in 18Ne by the Simultaneous Emission of Two Protons.

    PubMed

    Gómez Del Campo J; Galindo-Uribarri; Beene; Gross; Liang; Halbert; Stracener; Shapira; Varner; Chavez-Lomeli; Ortiz

    2001-01-01

    Radioactive ion beams of 17F were used to study several resonance states in 18Ne. Clear evidence for simultaneous two-proton emission from the 6.15 MeV state (Jpi = 1(-)) in 18Ne has been observed with the reaction 17F+1H. Because of limited angular coverage, the data did not differentiate between the two possible mechanisms of simultaneous decay, diproton (2He) emission or direct three-body decay. The two-proton partial width was found to be 21+/-3 eV assuming 2He emission and 57+/-6 eV assuming three-body decay. The total width of the 1(-) state was measured to be 50+/-5 keV. Several additional resonances that decay by single proton emission were also studied. PMID:11136089

  9. beta-decay studies of 135-137Sn using selective resonance laser ionization techniques

    Microsoft Academic Search

    J. Shergur; B. A. Brown; V. Fedoseyev; U. Köster; K.-L. Kratz; D. Seweryniak; W. B. Walters; A. Wöhr; D. Fedorov; M. Hannawald; M. Hjorth-Jensen; V. Mishin; B. Pfeiffer; J. J. Ressler; H. O. Fynbo; P. Hoff; H. Mach; T. Nilsson; K. Wilhelmsen-Rolander; H. Simon; A. Bickley

    2002-01-01

    The decays of the very neutron rich Sn isotopes 135-137Sn were studied at CERN\\/ISOLDE using isotopic and isobaric selectivity achieved by the use of a resonance ionization laser ion source and mass spectroscopy, respectively. Neutron decay rates, gamma-ray singles, and gamma-gamma coincidence data were collected as a function of time. The half-life (T1\\/2) and delayed neutron emission probability (Pn) values

  10. Direct proton decay from the Gamow-Teller resonance in 208Bi

    Microsoft Academic Search

    H. Akimune; I. Daito; Y. Fujita; M. Fujiwara; M. B. Greenfield; M. N. Harakeh; T. Inomata; J. Jaenecke; K. Katori; S. Nakayama; H. Sakai; Y. Sakemi; M. Tanaka; M. Yosoi

    1995-01-01

    Spin-isospin excitations in 208Bi have been investigated using the 208Pb (3He,t)208Bi reaction at near theta~=0° at E(3He)=450 MeV. The microscopic structure of the Gamow-Teller resonance (GTR), the isobaric analog state (IAS), and the spin-flip dipole (DeltaL=1) resonance (SDR) in 208Bi has been studied by observing their direct proton decays to the low-lying neutron-hole states in 207Pb. Decay protons were measured

  11. Resonant-state expansions and the long-time behavior of quantum decay

    SciTech Connect

    Garcia-Calderon, Gaston [Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Apartado Postal 20 364, 01000 Mexico, Distrito Federal (Mexico); Maldonado, Irene [Centro de Investigacion Cientifica y de Educacion Superior de Ensenada, Apartado Postal 2372, 22860 Ensenada, Baja California (Mexico); Villavicencio, Jorge [Instituto de Ciencia de Materiales de Madrid (CSIC), Cantoblanco, 28049 Madrid (Spain)

    2007-07-15

    It is shown that a representation of the decaying wave function as a resonant sum plus a nonexponential integral term may be written as a purely discrete resonant sum by evaluating at long times the integral term by the steepest descents method, and then expanding the resulting expression in terms of resonant states. This leads to a representation that is valid along the exponential and the inverse power in time regimes. A model calculation using the {delta} potential allows us to make a comparison of the expansion with numerical integrations in terms of continuum wave functions and, in the long time regime, with an exact analytic expression of the integral term obtained using the steepest descents method. The results demonstrate that resonant states give a correct description of the long-time behavior of decay.

  12. Temperature and density evolution during decay in a 2.45 GHz hydrogen electron cyclotron resonance plasma: off-resonant and resonant cases.

    PubMed

    Cortázar, O D; Megía-Macías, A; Vizcaíno-de-Julián, A

    2013-09-01

    Time resolved electron temperature and density measurements during the decay stage in a hydrogen electron cyclotron resonance (ECR) plasma are presented for a resonance and off-resonance magnetic field configurations. The measurements are conducted on a ECR plasma generator excited at 2.45 GHz denominated test-bench for ion-sources plasma studies at ESS Bilbao. The plasma parameters evolution is studied by Langmuir probe diagnostic with synchronized sample technique developed for repetitive pulsed plasmas with a temporal resolution of 200 ns in typical decay processes of about 40 ?s. An afterglow transient is clearly observed in the reflected microwave power signal from the plasma. Simultaneously, the electron temperature evolution shows rebounding peaks that may be related to the interplay between density drop and microwave coupling with deep impact on the Electron Energy Distribution Function. The correlation of such structures with the plasma absorbed power and the coupling quality is also reported. PMID:24089817

  13. Temperature and density evolution during decay in a 2.45 GHz hydrogen electron cyclotron resonance plasma: Off-resonant and resonant cases

    SciTech Connect

    Cortázar, O. D. [ESS Bilbao, Edificio Cosimet, Landabarri 2, 48940-Leioa, Vizcaya (Spain) [ESS Bilbao, Edificio Cosimet, Landabarri 2, 48940-Leioa, Vizcaya (Spain); Universidad de Castilla-La Mancha, ETSII, C.J. Cela s/n, 13170 Ciudad Real (Spain); Megía-Macías, A.; Vizcaíno-de-Julián, A. [ESS Bilbao, Edificio Cosimet, Landabarri 2, 48940-Leioa, Vizcaya (Spain)] [ESS Bilbao, Edificio Cosimet, Landabarri 2, 48940-Leioa, Vizcaya (Spain)

    2013-09-15

    Time resolved electron temperature and density measurements during the decay stage in a hydrogen electron cyclotron resonance (ECR) plasma are presented for a resonance and off-resonance magnetic field configurations. The measurements are conducted on a ECR plasma generator excited at 2.45 GHz denominated test-bench for ion-sources plasma studies at ESS Bilbao. The plasma parameters evolution is studied by Langmuir probe diagnostic with synchronized sample technique developed for repetitive pulsed plasmas with a temporal resolution of 200 ns in typical decay processes of about 40 ?s. An afterglow transient is clearly observed in the reflected microwave power signal from the plasma. Simultaneously, the electron temperature evolution shows rebounding peaks that may be related to the interplay between density drop and microwave coupling with deep impact on the Electron Energy Distribution Function. The correlation of such structures with the plasma absorbed power and the coupling quality is also reported.

  14. Decay pattern of the pygmy dipole resonance in 60Ni

    NASA Astrophysics Data System (ADS)

    Scheck, M.; Ponomarev, V. Yu.; Aumann, T.; Beller, J.; Fritzsche, M.; Isaak, J.; Kelley, J. H.; Kwan, E.; Pietralla, N.; Raut, R.; Romig, C.; Rusev, G.; Savran, D.; Sonnabend, K.; Tonchev, A. P.; Tornow, W.; Weller, H. R.; Zweidinger, M.

    2013-05-01

    Spin-1 states in 60Ni were excited with the (??,?') reaction, exploiting the High Intensity ??-ray Source at Triangle University Nuclear Laboratory. This facility is capable of providing fully linearly polarized, quasimonochromatic, Compton-backscattered photons in the entrance channel of the reaction. The depopulation of low-lying levels in an energy region far below the incident quasimonochromatic photons allows us to obtain average branching ratios of the excited spin-1 states. Levels within the energy region associated with the PDR showed regular behavior and ?75% of their decays are direct ground-state decays. The levels in the energy region above the PDR exhibit a statistical decay behavior to a large number of low-lying excited states and have only ?50-60% branches to the ground state. Within the framework of the quasiparticle phonon model this feature can be explained with the number of quasiparticles contributing to the wave functions of the excited spin-1 states. Quasimonochromatic photon beams provide a new method to test the microscopic nature of 1- levels.

  15. Evidence of a new narrow resonance decaying to ?(c1)? in B??(c1)?K.

    PubMed

    Bhardwaj, V; Miyabayashi, K; Adachi, I; Aihara, H; Asner, D M; Aulchenko, V; Aushev, T; Aziz, T; Bakich, A M; Bala, A; Bhuyan, B; Bischofberger, M; Bondar, A; Bonvicini, G; Bozek, A; Bra?ko, M; Brodzicka, J; Browder, T E; Chekelian, V; Chen, A; Cheon, B G; Chilikin, K; Chistov, R; Cho, K; Chobanova, V; Choi, S-K; Choi, Y; Cinabro, D; Dalseno, J; Danilov, M; Doležal, Z; Drásal, Z; Drutskoy, A; Dutta, D; Dutta, K; Eidelman, S; Epifanov, D; Farhat, H; Fast, J E; Ferber, T; Frey, A; Gaur, V; Gabyshev, N; Ganguly, S; Gillard, R; Goh, Y M; Golob, B; Haba, J; Hara, T; Hayashii, H; Horii, Y; Hoshi, Y; Hou, W-S; Hsiung, Y B; Hyun, H J; Iijima, T; Inami, K; Ishikawa, A; Itoh, R; Iwashita, T; Julius, T; Kah, D H; Kang, J H; Kato, E; Kawasaki, T; Kichimi, H; Kiesling, C; Kim, D Y; Kim, J B; Kim, J H; Kim, K T; Kim, M J; Kim, Y J; Kinoshita, K; Klucar, J; Ko, B R; Kodyš, P; Korpar, S; Križan, P; Krokovny, P; Kumar, R; Kumita, T; Kuzmin, A; Kwon, Y-J; Lange, J S; Lee, S-H; Li, J; Li, Y; Liu, C; Liu, Z Q; Liventsev, D; Lukin, P; Matvienko, D; Miyata, H; Mizuk, R; Mohanty, G B; Moll, A; Mussa, R; Nakano, E; Nakao, M; Natkaniec, Z; Nayak, M; Nedelkovska, E; Nisar, N K; Nishida, S; Nitoh, O; Ogawa, S; Okuno, S; Olsen, S L; Pakhlov, P; Pakhlova, G; Panzenböck, E; Park, H; Park, H K; Pedlar, T K; Pestotnik, R; Petri?, M; Piilonen, L E; Ritter, M; Röhrken, M; Rostomyan, A; Sahoo, H; Saito, T; Sakai, K; Sakai, Y; Sandilya, S; Santel, D; Santelj, L; Sanuki, T; Sato, Y; Savinov, V; Schneider, O; Schnell, G; Schwanda, C; Seidl, R; Semmler, D; Senyo, K; Seon, O; Sevior, M E; Shapkin, M; Shen, C P; Shibata, T-A; Shiu, J-G; Shwartz, B; Simon, F; Singh, J B; Smerkol, P; Sohn, Y-S; Sokolov, A; Solovieva, E; Stari?, M; Steder, M; Sumihama, M; Sumiyoshi, T; Tamponi, U; Tanida, K; Tatishvili, G; Teramoto, Y; Trabelsi, K; Tsuboyama, T; Uchida, M; Uehara, S; Uglov, T; Unno, Y; Urquijo, P; Usov, Y; Vahsen, S E; Van Hulse, C; Vanhoefer, P; Varner, G; Varvell, K E; Vinokurova, A; Wagner, M N; Wang, C H; Wang, M-Z; Wang, P; Watanabe, M; Watanabe, Y; Won, E; Yabsley, B D; Yamaoka, J; Yamashita, Y; Yashchenko, S; Yook, Y; Yuan, C Z; Zhang, C C; Zhang, Z P; Zhilich, V; Zhulanov, V; Zupanc, A

    2013-07-19

    We report measurements of B??(c1)?K and ?(c2)?K decays using 772×10(6) BB[over ¯] events collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Evidence of a new resonance in the ?(c1)? final state is found with a statistical significance of 3.8?. This state has a mass of 3823.1±1.8(stat)±0.7(syst) MeV/c(2), a value that is consistent with theoretical expectations for the previously unseen 1(3)D(2) cc[over ¯] meson. We find no other narrow resonance and set upper limits on the branching fractions of the X(3872)??(c1)? and ?(c2)? decays. PMID:23909309

  16. Decay pattern of the Pygmy Dipole Resonance in 140Ce

    NASA Astrophysics Data System (ADS)

    Isaak, J.; Löher, B.; Savran, D.; Aumann, T.; Beller, J.; Cooper, N.; Derya, V.; Duchêne, M.; Endres, J.; Fiori, E.; Kelley, J. H.; Knörzer, M.; Pietralla, N.; Ponomarev, V. Yu.; Romig, C.; Scheck, M.; Scheit, H.; Silva, J.; Tonchev, A. P.; Tornow, W.; Weller, H. R.; Werner, V.; Zilges, A.; Zweidinger, M.

    2015-05-01

    The decay behavior of low-lying dipole states in 140Ce was investigated exploiting the ?3-setup at the HI?S facility using quasi-monochromatic photon beams. Branching ratios of individual excited states as well as average branching ratios to low-lying states have been extracted using ? - ? coincidence measurements. The comparison of the average branching ratios to QPM calculations shows a remarkable agreement between experiment and theory in the energy range from 5.0 to 8.5 MeV.

  17. Decay-assisted collinear resonance ionization spectroscopy: Application to neutron-deficient francium

    E-print Network

    K. M. Lynch; J. Billowes; M. L. Bissell; I. Budin?evi?; T. E. Cocolios; R. P. De Groote; S. De Schepper; V. N. Fedosseev; K. T. Flanagan; S. Franchoo; R. F. Garcia Ruiz; H. Heylen; B. A. Marsh; G. Neyens; T. J. Procter; R. E. Rossel; S. Rothe; I. Strashnov; H. H. Stroke; K. D. A. Wendt

    2014-02-18

    This paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes $^{202-206}$Fr performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly-sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes $^{202-206}$Fr, in addition to the identification of the low-lying states of $^{202,204}$Fr performed at the CRIS experiment.

  18. Radiative decays of the Y(3940), Z(3930) and the X(4160) as dynamically generated resonances

    E-print Network

    Tanja Branz; Raquel Molina; Eulogio Oset

    2010-10-04

    We study the radiative decay properties of the charmonium-like X, Y and Z mesons generated dynamically from vector meson-vector meson interaction in the framework of a unitarized hidden-gauge formalism. In the present work we calculate the one- and two-photon decay widths of the hidden-charm Y(3940), Z(3930) (or X(3915)) and X(4160) mesons in the framework of the vector meson dominance formalism. We obtain good agreement with experiment in case of the two photon width of the X(3915) which we associate with the $2^+$ resonance that we find at 3922 MeV.

  19. Production characteristics of K0 and light meson resonances in hadronic decays of the Z 0

    Microsoft Academic Search

    P. P. Abreu; W. Adam; T. Adye; E. Agasi; I. Ajinenko; Roy Aleksan; G. D. Alekseev; P. P. Allport; S. Almehed; F. M. L. Almeida; S. J. Alvsvaag; Ugo Amaldi; A. Andreazza; P. Antilogus; V B Anykeyev; W.-D. Apel; R. J. Apsimon; Y. Arnoud; B. Asman; J.-E. Augustin; A. Augustinus; Paul Baillon; P. Bambade; F. Barao; R. Barate; Guido Barbiellini; Dimitri Yuri Bardin; G. J. Barker; A. Baroncelli; O. Barring; J. A. Barrio; Walter Bartl; M. J. Bates; Marco Battaglia; M. Baubillier; J. Baudot; K.-H. Becks; M. Begalli; P. Beilliere; P. Beltran; Alberto C Benvenuti; M. Berggren; D. Bertrand; F. Bianchi; M. Bigi; M. S. Bilenky; P. Billoir; J. Bjarne; D. Bloch; J. Blocki; S. Blyth; V. Bocci; P. N. Bogolubov; T. Bolognese; M. Bonesini; W. Bonivento; P. S. L. Booth; G. Borisov; C. Bosio; B. Bostjancic; S. Bosworth; O. Botner; E. Boudinov; B. Bouquet; C. Bourdarios; T. J. V. Bowcock; M. Bozzo; S. Braibant; P. Branchini; K. D. Brand; R. A. Brenner; H. Briand; C. Bricman; L. Brillault; R. C. A. Brown; P. Bruckman; J.-M. Brunet; L. Bugge; T. Buran; A. Buys; J. A. M. A. Buytaert; M. Caccia; M. Calvi; A. J. Camacho Rozas; R. Campion; T. Camporesi; V. Canale; K. Cankocak; F. Cao; F. Carena; P. Carrilho; L. Carroll; R. Cases; Carlo Caso; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; L. Cerrito; V. Chabaud; A. Chan; M M Chapkin; Ph. Charpentier; L. Chaussard; J. Chauveau; P. Checchia; G. A. Chelkov; P V Chliapnikov; V. Chorowicz; J. T. M. Chrin; V. Cindro; P. Collins; J. L. Contreras; R. Contri; E. Cortina; G. Cosme; F. Couchot; H. B. Crawley; D J Crennell; G. Crosetti; J. Cuevas Maestro; S. Czellar; Erik Dahl-Jensen; J. Dahm; B. Dalmagne; M. Dam; G. Damgaard; Evelyne Daubie; A. Daum; P. D. Dauncey; Martyn Davenport; J. Davies; W. da Silva; C. Defoix; P A Delpierre; N. Demaria; A. de Angelis; H. de Boeck; Wim de Boer; S. de Brabandere; C. de Clercq; M. D. M. de Fez Laso; C. de La Vaissiere; B. de Lotto; A. de Min; L S De Paula; C. de Saint-Jean; H. Dijkstra; Lucia Di Ciaccio; F. Djama; J. Dolbeau; M. Donszelmann; K. Doroba; M. Dracos; J. Drees; M. Dris; Y. Dufour; F. Dupont; D M Edsall; R. Ehret; T J C Ekelöf; Gösta Ekspong; M. Elsing; J.-P. Engel; N. Ershaidat; M. Espirito Santo; D. Fassouliotis; Michael Feindt; A. Ferrer; T. A. Filippas; A. Firestone; H. Foeth; E. Fokitis; F. Fontanelli; F. Formenti; J.-L. Fousset; B J Franek; P. Frenkiel; D E C Fries; A. G. Frodesen; R. Fruhwirth; F. Fulda-Quenzer; H. Furstenau; J A Fuster; D. Gamba; M. Gandelman; C. Garcia; J. Garcia; C. Gaspar; U. Gasparini; Ph. Gavillet; E. N. Gazis; D. Gele; J.-P. Gerber; P. Giacomelli; D. Gillespie; R. Gokieli; B. Golob; V. M. Golovatyuk; J. J. Gomez Y Cadenas; Gian P Gopal; L. Gorn; M. Gorski; Valerio Gracco; F. Grard; E. Graziani; G. Grosdidier; P. Gunnarsson; J. Guy; U. Haedinger; F. Hahn; M. Hahn; S. Hahn; S. Haider; Z. Hajduk; A. Hakansson; A. Hallgren; K. Hamacher; W. Hao; F. J. Harris; V. Hedberg; R P Henriques; J. J. Hernandez; J. A. Hernando; P. Herquet; H. Herr; T. L. Hessing; E. Higon; Hans Jürgen Hilke; T. S. Hill; S.-O. Holmgren; P. J. Holt; D J Holthuizen; P. F. Honore; M A Houlden; Josef Hrubec; K. Huet; K. Hultqvist; P. Ioannou; P.-S. Iversen; J. N. Jackson; R. Jacobsson; P. Jalocha; G. Jarlskog; P. Jarry; B. Jean-Marie; E. K. Johansson; M. Jonker; L B Jönsson; P. Juillot; M. Kaiser; George Ernest Kalmus; F. Kapusta; M. Karlsson; E. Karvelas; S. Katsanevas; E. C. Katsoufis; R. Keranen; B. A. Khomenko; N N Khovanskii; B J King; N. J. Kjaer; H. Klein; A Klovning; P M Kluit; A. Koch-Mehrin; J. H. Koehne; B. Koene; P. Kokkinias; M. Koratzinos; A. V. Korytov; V. Kostioukhine; C. Kourkoumelis; O. Kouznetsov; P. H. Kramer; Manfred Krammer; C. Kreuter; J. Krolikowski; I J Kronkvist; W. Krupinski; W. Kucewicz; K. Kulka; K L Kurvinen; C. Lacasta; I. Laktineh; C. Lambropoulos; J. W. Lamsa; L. Lanceri; P. Langefeld; V. Lapin; I. Last; J.-P. Laugier; R. Lauhakangas; Gerhard Leder; F. Ledroit; R. Leitner; Y. Lemoigne; J. Lemonne; Georg Lenzen; V. Lepeltier; J. M. Levy; R. Lieb; R. Lindner; A. Lipniacka; I. Lippi; B. Loerstad; M. Lokajicek; J. G. Loken; A. Lopez-Fernandez; M. A. Lopez Aguera; M E Los; D. Loukas; J Lozano-Bahilo; P. Lutz; L. Lyons; G. Maehlum; J. Maillard; A. Maio; A. Maltezos; F. Mandl; J. Marco; B. Marechal; M. Margoni; J.-C. Marin; C. Mariotti; A. Markou; T. Maron; S. Marti; C. Martinez-Rivero; F. Martinez-Vidal; F. Matorras; C. Matteuzzi; Giorgio Matthiae; M. Mazzucato; M. Mc Cubbin; R. Mc Kay; R. Mc Nulty; J. Medbo; C. Meroni; W. T. Meyer; M. Michelotto; E. Migliore; I. Mikulec; L. Mirabito; Winfried A Mitaroff; G. V. Mitselmakher; U. Mjoernmark; T. Moa; R. Moeller; K. Moenig; M. R. Monge; P. Morettini; H. Mueller; W. J. Murray; B. Muryn; Gerald Myatt; F. Naraghi; Francesco Luigi Navarria; P. Negri; S. Nemecek; W. Neumann; N. Neumeister

    1995-01-01

    An analysis of inclusive production of K0 and the meson resonances K*±(892), rho0(770), f 0(975) and f 2(1270) in hadronic decays of the Z0 is presented, based on about 973,000 multihadronic events collected by the DELPHI detector at LEP during 1991 and 1992. Overall multiplicities have been determined as 1.962±0.060 K0 mesons, 0.712±0.067 K*±(892) and 1.21±0.15rho0(770) per hadronic Z0 decay.

  20. Test for exotic isoscalar resonance dominating $D^0 \\to \\pi^+ \\pi^- \\pi^0$ decays

    E-print Network

    Gronau, Michael

    2015-01-01

    The decay $D^0 \\to \\pi^+ \\pi^- \\pi^0$ appears to be dominated by $\\rho \\pi$ states in a configuration of zero total isotopic spin. The spin $J$, parity $P$, and charge-conjugation eigenvalue $C$ of this final state are therefore $J^{PC} = 0^{--}$, which cannot be formed of a quark $q$ and antiquark $\\bar q$. If a resonance near $M(D^0)$ dominates the final state, it must be a {\\it hybrid} composed of a quark-antiquark pair and a constituent gluon, or a {\\it tetraquark} $q q \\bar q \\bar q$. A test for this resonance in electroproduction is proposed.

  1. Zero energy resonance and the logarithmically slow decay of unstable multilevel systems

    E-print Network

    Manabu Miyamoto

    2006-09-23

    The long time behavior of the reduced time evolution operator for unstable multilevel systems is studied based on the N-level Friedrichs model in the presence of a zero energy resonance.The latter means the divergence of the resolvent at zero energy. Resorting to the technique developed by Jensen and Kato [Duke Math. J. 46, 583 (1979)], the zero energy resonance of this model is characterized by the zero energy eigenstate that does not belong to the Hilbert space. It is then shown that for some kinds of the rational form factors the logarithmically slow decay of the reduced time evolution operator can be realized.

  2. Hadronic decays of the highly excited $2D$ $D_s$ resonances

    E-print Network

    Jing Ge; Dan-Dan Ye; Ailin Zhang

    2015-04-29

    Hadronic decays of the highly excited $2D$ $D_s$ resonances have been studied in the $^3P_0$ model. Widths of all possible hadronic decay channels of the $2D$ $D_s$ have been computed. $D^*_{s1}(2700)$, $D^*_{s1}(2860)$, $D^*_{s3}(2860)$, $D(2600)$ and $D(2750)$ can be produced from hadronic decays of the $2D$ $D_s$, and relevant hadronic decay widths have been particularly paid attention to. The hadronic decay widths of $2D$ $D_s$ to $D(2600)$ or $D(2750)$ may be large, and the numerical results are different in different assignments of $D(2600)$ and $D(2750)$. The hadronic decay widths of $2D$ $D_s$ to $D^*_{s1}(2860)$, $D^*_{s3}(2860)$ or $D^*_{s1}(2700)$ are very small, and different in different assignments of $D^*_{s1}(2700)$.

  3. Initial cooperative decay rate and cooperative Lamb shift of resonant atoms in an infinite cylindrical geometry

    SciTech Connect

    Friedberg, Richard; Manassah, Jamal T. [Department of Physics, Columbia University, New York, New York 10027 (United States); Department of Electrical Engineering, City College of New York, New York 10031 (United States)

    2011-08-15

    We obtain in both the scalar and vector photon models the analytical expressions for the initial cooperative decay rate and the cooperative Lamb shift for an ensemble of resonant atoms distributed uniformly in an infinite cylindrical geometry for the case that the initial state of the system is prepared in a phased state modulated in the direction of the cylindrical axis. We find that qualitatively the scalar and vector theories give different results.

  4. Observation of the parametric decay instability during electron cyclotron resonance heating on the Versator II tokamak

    SciTech Connect

    McDermott, F.S.; Bekefi, G.; Hackett, K.E.; Levine, J.S.; Porkolab, M.

    1982-09-01

    Observations are reported on a nonlinear, three-wave interaction process occurring during high-power electron cyclotron heating in the Versator II tokamak. The measured spectra and the threshold power are consistent with a model in which the incident power in the extraordinary mode of polarization decays at the upper-hybrid resonance layer into a lower-hybrid wave and an electron Bernstein wave.

  5. Measurement of inclusive production of light meson resonances in hadronic decays of the Z0

    Microsoft Academic Search

    P. Abreu; W. Adam; T. Adye; E. Agasi; G. D. Alekseev; A. Algeri; P. Allen; S. Almehed; S. J. Alvsvaag; U. Amaldi; E. G. Anassontzis; A. Andreazza; P. Antilogus; W.-D. Apel; R. J. Apsimon; B. Åsman; J.-E. Augustin; A. Augustinus; P. Baillon; P. Bambade; F. Barao; R. Barate; G. Barbiellini; D. Y. Bardin; G. Barker; A. Baroncelli; O. Barring; J. A. Barrio; W. Bartl; M. J. Bates; M. Battaglia; M. Baubillier; K.-H. Becks; C. J. Beeston; M. Begalli; P. Beilliere; Yu. Belokopytov; P. Beltran; D. Benedic; A. C. Benvenuti; M. Berggren; D. Bertrand; F. Bianchi; M. S. Bilenky; P. Billior; J. Bjarne; D. Bloch; S. Blyth; V. Bocci; P. N. Bogolubov; T. Bolognese; M. Bonesini; W. Bonivento; P. S. L. Booth; P. Borgeaud; G. Borisov; H. Borner; C. Bosio; B. Bostjancic; S. Bosworth; O. Botner; B. Bouquet; C. Bourdarion; T. J. V. Bowcock; M. Bozzo; S. Braibant; P. Branchini; K. D. Brand; R. A. Brenner; H. Briand; C. Bricman; R. C. A. Brown; N. Brummer; J.-M. Brunet; L. Bugge; T. Buran; H. Burmeister; J. A. M. A. Buytaert; M. Caccia; M. Calvi; A. J. Camacho Rozas; R. Campion; T. Camporesi; V. Canale; F. Cao; F. Carena; L. Carroll; C. Caso; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; L. Cerrito; V. Chabaud; A. Chan; M. Chapkin; L. Chaussard; J. Chauveau; P. Checchia; G. A. Chelkov; L. Chevalier; P. Chliapnikov; V. Chorowicz; J. T. M. Chrin; M. P. Clara; P. Coolins; J. L. Contreras; R. Contri; E. Cortina; G. Cosme; F. Couchot; H. B. Crawley; D. Crennell; D. Crosetti; M. Crozon; J. Cuevas Maestro; S. Czellar; E. Dahl-Jensen; B. Dalmagne; M. Dam; G. Damgaard; G. Darbo; E. Daubie; A. Daum; P. D. Dauncey; M. Davenport; P. David; J. Davies; W. Da Silva; C. Defoix; D. Delikaris; S. Delorme; P. Delpierre; N. Demaria; A. De Angelis; H. De Boeck; W. De Boer; C. De Clercq; M. D. M. De Fez Laso; N. De Groot; C. De La Vaissiere; B. De Lotto; A. De Min; H. Dijkstra; L. Di Ciaccio; F. Djama; J. Dolbeau; M. Donszelmann; K. Doroba; M. Dracos; M. Drees; M. Dris; Y. Dufour; F. Dupont; L.-O. Eek; P. A.-M. Eerola; R. Ehret; T. Ekelof; G. Ekspong; A. Elliot Peisert; J.-P. Engel; N. Ershaidat; D. Fassouliotis; M. Feindt; M. Fernandez Alonso; A. Ferrer; T. A. Filippas; A. Firestone; H. Foeth; E. Fokitis; F. Fontanelli; K. A. J. Forbes; J.-L. Fousset; S. Francon; B. Franek; P. Frenkiel; D. C. Fries; A. G. Frodesen; R. Fruhwirth; F. Fulda-Quenzer; K. Furnival; H. Furstenau; J. Fuster; D. Gamba; C. Garcia; J. Garcia; C. Gaspar; U. Gasparini; Ph. Gavillet; E. N. Gazis; J.-P. Gerber; P. Giacomelli; R. Gokieli; B. Golob; V. M. Golovatyuk; J. J. Gomez Y Cadenas; A. Goobar; G. Gopal; M. Gorski; V. Gracco; A. Grant; F. Grard; E. Graziani; G. Grosdidier; E. Gross; P. Grosse-Wiesmann; B. Grossetete; J. Guy; U. Haedinger; F. Hahn; M. Hahn; S. Haider; Z. Hajduk; A. Hakansson; A. Hallgren; K. Hamacher; G. Hamel De Monchenault; W. Hao; F. J. Harris; T. Henkes; J. J. Hernandez; P. Herquet; H. Herr; T. L. Hessing; I. Hietanen; C. O. Higgins; E. Higon; H. J. Hilke; S. D. Hodgson; T. Hofmokl; R. Holmes; S.-O. Holmgren; D. Holthuizen; P. F. Honore; J. E. Hooper; M. Houlden; J. Hrubec; K. Huet; P. O. Hulth; K. Hultqvist; P. Ioannou; D. Isenhower; P.-S. Iversen; J. N. Jackson; P. Jalocha; G. Jarlskog; P. Jarry; B. Jean-Marie; E. K. Johansson; D. Johnson; M. Jonker; L. Jonsson; P. Juillot; G. Kalkanis; G. Kalmus; F. Kapusta; M. Karlsson; E. Karvelas; S. Katsanevas; E. C. Katsoufis; R. Keranen; J. Kesteman; B. A. Khomenko; N. N. Khovanski; B. King; N. J. Kjaer; H. Klein; W. Klempt; A. Klovning; P. Kluit; A. Koch-Mehrin; J. H. Koehne; B. Koene; P. Kokkinias; M. Kopf; K. Korcyl; A. V. Korytov; V. Kostioukhine; C. Kourkoumelis; O. Kouznetsov; P. H. Kramer; J. Krolikowski; I. Kronkvist; U. Kruener-Marquis; W. Kucewicz; K. Kulka; K. Kurvinen; C. Lacasta; C. Lambropoulos; J. W. Lamsa; L. Lanceri; V. Lapin; J.-P. Laugier; R. Lauhakangas; G. Leder; F. Ledroit; R. Leitner; Y. Lemoigne; J. Lemonne; G. Lenzen; V. Lepeltier; T. Lesiak; J. M. Levy; E. Lieb; D. Liko; J. Lindgren; R. Lindner; A. Lipniacka; I. Lippi; B. Loerstad; M. Lokajicek; J. G. Loken; A. Lopez-Fernandez; M. A. Lopez Aguera; M. Los; D. Loukas; J. J. Lozano; P. Lutz; L. Lyons; G. Maehlum; J. Maillard; A. Maltezos; F. Mandl; J. Marco; M. Margoni; J.-C. Marin; A. Markou; T. Maron; S. Marti; L. Mathis; F. Matorras; C. Matteuzzi; G. Matthiae; M. Mazzucato; M. Mc Cubbin; R. Mc Kay; R. Mc Nulty; G. Meola; C. Meroni; W. T. Meyer; M. Michelotto; I. Mikulec; L. Mirabito; W. A. Mitaroff; G. V. Mitselmakher; U. Mjoernmark; T. Moa; R. Moeller; K. Moenig; M. R. Monge; P. Morettini; H. Mueller; W. J. Murray; G. Myatt; F. L. Navarria; P. Negri; B. S. Nielsen; B. Nijjhar; V. Nikolaenko; P. E. S. Nilsen; P. Niss; V. Obraztsov; A. G. Olshevski; R. Orava; A. Ostankov; K. Osterberg; A. Ouraou; M. Paganoni; R. Pain; H. Palka; Th. D. Papadopoulou; L. Pape; A. Passeri; M. Pegoraro

    1993-01-01

    A study of inclusive production of the meson resonances rho0, K*0 (892), f;0 (975) and f;2 (1270) in hadronic decays of the Z0 is presented. The measured mean meson multiplicity per hadronic event is 0.83 +\\/- 0.14 for the rho0 0.64 +\\/- 0.24 for the K*0 (892), 0.10 +\\/- 0.04 for the f;0 (975) in the momentum range p >

  6. Excitation and photon decay of giant multipole resonances - the role and future of medium-energy heavy ions

    SciTech Connect

    Bertrand, F.E.; Beene, J.R.; Horen, D.J.

    1988-01-01

    Inelastic scattering of medium energy heavy ions provides very large cross sections and peak-to-continuum ratios for excitation of giant resonances. For energies above about 50 MeV/nucleon, giant resonances are excited primarily through Coulomb excitation, which is indifferent to isospin, thus providing a good probe for the study of isovector giant resonances. The extremely large cross sections available from heavy ion excitation permit the study of rare decay modes of the photon decay of giant resonances following excitation by 22 and 84 MeV/nucleon /sup 17/O projectiles. The singles results at 84 MeV/nucleon yield peak cross sections for the isoscalar giant quadrupole resonance and the isovector giant dipole resonance of approximately 0.8 and 3 barns/sr, respectively. Data on the ground state decay of the isoscalar giant quadrupole and isovector giant dipole resonances are presented and compared with calculations. Decays to low-lying excited states are also discussed. Preliminary results from an experiment to isolate the /sup 208/Pb isovector quadrupole resonance using its gamma decay are presented.

  7. Search for baryonic resonances decaying to ?? in deep-inelastic scattering at HERA

    NASA Astrophysics Data System (ADS)

    Aktas, A.; Alexa, C.; Andreev, V.; Anthonis, T.; Antunovic, B.; Aplin, S.; Asmone, A.; Astvatsatourov, A.; Backovic, S.; Baghdasaryan, A.; Baranov, P.; Barrelet, E.; Bartel, W.; Baudrand, S.; Beckingham, M.; Begzsuren, K.; Behnke, O.; Behrendt, O.; Belousov, A.; Berger, N.; Bizot, J. C.; Boenig, M.-O.; Boudry, V.; Bozovic-Jelisavcic, I.; Bracinik, J.; Brandt, G.; Brinkmann, M.; Brisson, V.; Bruncko, D.; Büsser, F. W.; Bunyatyan, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A. J.; Cantun Avila, K. B.; Cassol-Brunner, F.; Cerny, K.; Cerny, V.; Chekelian, V.; Cholewa, A.; Contreras, J. G.; Coughlan, J. A.; Cozzika, G.; Cvach, J.; Dainton, J. B.; Daum, K.; Deak, M.; de Boer, Y.; Delcourt, B.; Del Degan, M.; de Roeck, A.; de Wolf, E. A.; Diaconu, C.; Dodonov, V.; Dubak, A.; Eckerlin, G.; Efremenko, V.; Egli, S.; Eichler, R.; Eisele, F.; Eliseev, A.; Elsen, E.; Essenov, S.; Falkewicz, A.; Faulkner, P. J. W.; Favart, L.; Fedotov, A.; Felst, R.; Feltesse, J.; Ferencei, J.; Finke, L.; Fleischer, M.; Fomenko, A.; Franke, G.; Frisson, T.; Gabathuler, E.; Garutti, E.; Gayler, J.; Ghazaryan, S.; Ginzburgskaya, S.; Glazov, A.; Glushkov, I.; Goerlich, L.; Goettlich, M.; Gogitidze, N.; Gorbounov, S.; Gouzevitch, M.; Grab, C.; Greenshaw, T.; Grell, B. R.; Grindhammer, G.; Habib, S.; Haidt, D.; Hansson, M.; Heinzelmann, G.; Helebrant, C.; Henderson, R. C. W.; Henschel, H.; Herrera, G.; Hildebrandt, M.; Hiller, K. H.; Hoffmann, D.; Horisberger, R.; Hovhannisyan, A.; Hreus, T.; Jacquet, M.; Janssen, M. E.; Janssen, X.; Jemanov, V.; Jönsson, L.; Johnson, D. P.; Jung, A. W.; Jung, H.; Kapichine, M.; Katzy, J.; Kenyon, I. R.; Kiesling, C.; Klein, M.; Kleinwort, C.; Klimkovich, T.; Kluge, T.; Knutsson, A.; Korbel, V.; Kostka, P.; Kraemer, M.; Krastev, K.; Kretzschmar, J.; Kropivnitskaya, A.; Krüger, K.; Landon, M. P. J.; Lange, W.; Laštovi?ka-Medin, G.; Laycock, P.; Lebedev, A.; Leibenguth, G.; Lendermann, V.; Levonian, S.; Lindfeld, L.; Lipka, K.; Liptaj, A.; List, B.; List, J.; Loktionova, N.; Lopez-Fernandez, R.; Lubimov, V.; Lucaci-Timoce, A.-I.; Lytkin, L.; Makankine, A.; Malinovski, E.; Marage, P.; Marti, L.; Martisikova, M.; Martyn, H.-U.; Maxfield, S. J.; Mehta, A.; Meier, K.; Meyer, A. B.; Meyer, H.; Meyer, H.; Meyer, J.; Michels, V.; Mikocki, S.; Milcewicz-Mika, I.; Mladenov, D.; Mohamed, A.; Moreau, F.; Morozov, A.; Morris, J. V.; Mozer, M. U.; Müller, K.; Murín, P.; Nankov, K.; Naroska, B.; Naumann, T.; Newman, P. R.; Niebuhr, C.; Nikiforov, A.; Nowak, G.; Nowak, K.; Nozicka, M.; Oganezov, R.; Olivier, B.; Olsson, J. E.; Osman, S.; Ozerov, D.; Palichik, V.; Panagoulias, I.; Pandurovic, M.; Papadopoulou, T.; Pascaud, C.; Patel, G. D.; Peng, H.; Perez, E.; Perez-Astudillo, D.; Perieanu, A.; Petrukhin, A.; Picuric, I.; Piec, S.; Pitzl, D.; Pla?akyt?, R.; Povh, B.; Preda, T.; Prideaux, P.; Rahmat, A. J.; Raicevic, N.; Ravdandorj, T.; Reimer, P.; Rimmer, A.; Risler, C.; Rizvi, E.; Robmann, P.; Roland, B.; Roosen, R.; Rostovtsev, A.; Rurikova, Z.; Rusakov, S.; Salvaire, F.; Sankey, D. P. C.; Sauter, M.; Sauvan, E.; Schmidt, S.; Schmitt, S.; Schmitz, C.; Schoeffel, L.; Schöning, A.; Schultz-Coulon, H.-C.; Sefkow, F.; Shaw-West, R. N.; Sheviakov, I.; Shtarkov, L. N.; Sloan, T.; Smiljanic, I.; Smirnov, P.; Soloviev, Y.; South, D.; Spaskov, V.; Specka, A.; Staykova, Z.; Steder, M.; Stella, B.; Stiewe, J.; Straumann, U.; Sunar, D.; Sykora, T.; Tchoulakov, V.; Thompson, G.; Thompson, P. D.; Toll, T.; Tomasz, F.; Traynor, D.; Trinh, T. N.; Truöl, P.; Tsakov, I.; Tseepeldorj, B.; Tsipolitis, G.; Tsurin, I.; Turnau, J.; Tzamariudaki, E.; Urban, K.; Utkin, D.; Valkárová, A.; Vallée, C.; van Mechelen, P.; Vargas Trevino, A.; Vazdik, Y.; Vinokurova, S.; Volchinski, V.; Weber, G.; Weber, R.; Wegener, D.; Werner, C.; Wessels, M.; Wissing, C.; Wolf, R.; Wünsch, E.; Xella, S.; Yeganov, V.; Žá?ek, J.; Zálešák, J.; Zhang, Z.; Zhelezov, A.; Zhokin, A.; Zhu, Y. C.; Zimmermann, T.; Zohrabyan, H.; Zomer, F.

    2007-11-01

    A search for narrow baryonic resonances decaying into ?-?- or ?-?+ and their antiparticles is carried out with the H1 detector using deep inelastic scattering events at HERA in the range of negative photon four-momentum transfer squared 2 < Q2 < 100 GeV2. No signal is observed for a new baryonic state in the mass range 1600-2300 MeV in either the doubly charged or the neutral decay channels. The known ?(1530)0 is observed through its decay mode into ?-?+. Upper limits are given on the ratio of the production rates of new baryonic states, such as the hypothetical pentaquark states ?- 5q or ?0 5q, relative to the ?(1530)0 baryon state.

  8. ?(1475) and f 1(1420) resonances in the decay processes J/? ? ?(??, ??0, ??) and in ??* collisions

    NASA Astrophysics Data System (ADS)

    Achasov, N. N.; Shestakov, G. N.

    2011-09-01

    A scenario that removes the contradiction between the suppression of the ?(1475) ? ?? decay width and the strong coupling of ?(1475) to the ??, ??, and ??0 channels and which leads to a nontrivial prediction for the manifestation of ?(1475) in ??*( Q 2) collisions is considered. Data on the dependence of the cross section for the reaction ??*( Q 2) ? Kbar K? on the photon virtuality in the energy range 1.35-1.55 GeV are explained here by the production of an ?(1475) resonance in contrast to their standard interpretation in terms of the f 1(1420) resonance. Experimental verification of the present explanation requires determining the spin-parity of resonance contributions, R, in the reactions ??*( Q 2) R ? R ? Kbar K? and J/? ? ? R ? ?(??0, ??).

  9. Peak Locations and Relative Phase of Different Decay Modes of the a1 Axial Vector Resonance in Diffractive Production

    NASA Astrophysics Data System (ADS)

    Basdevant, Jean-Louis; Berger, Edmond L.

    2015-05-01

    We show that a single I =1 spin-parity JP C=1++ a1 resonance can manifest itself as two separated mass peaks, one decaying into an S -wave ? ? system and the second decaying into a P -wave f0(980 )? system, with a rapid increase of the phase difference between their amplitudes arising mainly from the structure of the diffractive production process. This study clarifies questions related to the mass, width, and decay rates of the a1 resonance raised by the recent high statistics data of the COMPASS Collaboration on a1 production in ? N ?? ? ? N at high energies.

  10. Peak Locations and Relative Phase of Different Decay Modes of the a_{1} Axial Vector Resonance in Diffractive Production.

    PubMed

    Basdevant, Jean-Louis; Berger, Edmond L

    2015-05-15

    We show that a single I=1 spin-parity J^{PC}=1^{++} a_{1} resonance can manifest itself as two separated mass peaks, one decaying into an S-wave ?? system and the second decaying into a P-wave f_{0}(980)? system, with a rapid increase of the phase difference between their amplitudes arising mainly from the structure of the diffractive production process. This study clarifies questions related to the mass, width, and decay rates of the a_{1} resonance raised by the recent high statistics data of the COMPASS Collaboration on a_{1} production in ?N????N at high energies. PMID:26024163

  11. Decay of Isoscalar Electric Giant Resonances in MAGNESIUM-24 and CALCIUM-40.

    NASA Astrophysics Data System (ADS)

    Zwarts, Frederik

    1983-01-01

    This dissertation describes an experimental investigation of the decay properties of the ('24)Mg and ('40)Ca nuclei in the excitation energy region from about 10 MeV to 25 MeV (the giant resonance region). The states in this region were populated by means of inelastic scattering of 120 MeV alpha particles. The scattered alpha particles were detected with a magnetic spectrograph at an angle for which the cross section for excitation of 2('+) (quadrupole) and 0('+) (monopole) states has a maximum. Due to the high resolution of the spectrograph the excitation energy of the states in the mother nuclei could be determined accurately. The decay of these states was studied by means of a coincidence experiment where the decay products, protons and alpha particles at low energy (less than 25 MeV), were detected in coincidence with the inelastically scattered alpha particles. Since this measurement is kinematically complete, the excitation energy of the daughter nuclei could be determined, as well. The angular correlation of the decay products, in particular of the alpha decay to the ground state, is typical for the spin and parity of the excited state in the mother nucleus. Most of the strength found in the region 10-16 MeV could in this way by proven to be quadrupole strength, in agreement with other experiments. However, also some monopole strength has been found (8%-20% of the energy weighted sumrule strength (EWSR) in ('24)Mg and 4%-15% EWSR in ('40)Ca). For an excitation energy beyond the Q-value of the decay plus the Coulomb barrier the forward backward asymmetry of the angular correlations increases very rapidly for most of the decay channels. This is explained by taking into account the contribution of the quasi-elastic knock -out reactions. In the case of ('24)Mg it is concluded from the shape of the measured spectra that a (coherent) interference of the two processes is present. The probability of the different decay channels as a function of the excitation energy is compared with calculations for statistical decay. For the case of ('24)Mg the differences are clearly indicating a non-statistical decay as well. (Abstract shortened with permission of author.).

  12. Decay of vector-vector resonances into {gamma} and a pseudoscalar meson

    SciTech Connect

    Molina, R.; Oset, E. [Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Apartado 22085, 46071 Valencia (Spain); Nagahiro, H. [Department of Physics, Nara Women's University, Nara 630-8506 (Japan); Hosaka, A. [Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047 (Japan)

    2011-05-01

    We study the decay of dynamically generated resonances from the interaction of two vectors into a {gamma} and a pseudoscalar meson. The dynamics requires anomalous terms involving vertices with two vectors and a pseudoscalar, which renders it special. We compare our result with data on K{sub 2}{sup *+}(1430){yields}K{sup +}{gamma} and K{sub 2}{sup *0}(1430){yields}K{sup 0}{gamma} and find a good agreement with the data for the K{sub 2}{sup *+}(1430) case and a width considerably smaller than the upper bound measured for the K{sub 2}{sup *0}(1430) meson. We also investigate the decay into {pi}{sup +{gamma}} of one a{sub 2} state, tentatively associated to the a{sub 2}(1320), obtaining qualitative agreement with data.

  13. Decay of vector-vector resonances into $?$ and a pseudoscalar meson

    E-print Network

    R. Molina$^1$; H. Nagahiro$^2$; A. Hosaka$^3$; E. Oset$^1$

    2010-09-24

    We study the decay of dynamically generated resonances from the interaction of two vectors into a $\\gamma$ and a pseudoscalar meson. The dynamics requires anomalous terms involving vertices with two vectors and a pseudoscalar, which renders it special. We compare our result with data on $K^{*+}(1430)\\to K^+\\gamma$ and $K^{*0}(1430)\\to K^0\\gamma$ and find a good agreement with the data for the $K^{*+}(1430)$ case and a width considerably smaller than the upper bound measured for the $K^{*0}(1430)$ meson.

  14. Search for Resonant Top-Antitop Production in the Lepton Plus Jets Decay Mode Using the Full CDF Data Set

    NASA Astrophysics Data System (ADS)

    Aaltonen, T.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J. A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashmanskas, W.; Auerbach, B.; Aurisano, A.; Azfar, F.; Badgett, W.; Bae, T.; Barbaro-Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Barria, P.; Bartos, P.; Bauce, M.; Bedeschi, F.; Behari, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Beretvas, A.; Bhatti, A.; Bland, K. R.; Blumenfeld, B.; Bocci, A.; Bodek, A.; Bortoletto, D.; Boudreau, J.; Boveia, A.; Brigliadori, L.; Bromberg, C.; Brucken, E.; Budagov, J.; Budd, H. S.; Burkett, K.; Busetto, G.; Bussey, P.; Butti, P.; Buzatu, A.; Calamba, A.; Camarda, S.; Campanelli, M.; Canelli, F.; Carls, B.; Carlsmith, D.; Carosi, R.; Carrillo, S.; Casal, B.; Casarsa, M.; Castro, A.; Catastini, P.; Cauz, D.; Cavaliere, V.; Cavalli-Sforza, M.; Cerri, A.; Cerrito, L.; Chen, Y. C.; Chertok, M.; Chiarelli, G.; Chlachidze, G.; Cho, K.; Chokheli, D.; Ciocci, M. A.; Clark, A.; Clarke, C.; Convery, M. E.; Conway, J.; Corbo, M.; Cordelli, M.; Cox, C. A.; Cox, D. J.; Cremonesi, M.; Cruz, D.; Cuevas, J.; Culbertson, R.; d'Ascenzo, N.; Datta, M.; De Barbaro, P.; Demortier, L.; Deninno, M.; Devoto, F.; d'Errico, M.; Di Canto, A.; Di Ruzza, B.; Dittmann, J. R.; D'Onofrio, M.; Donati, S.; Dorigo, M.; Driutti, A.; Ebina, K.; Edgar, R.; Elagin, A.; Erbacher, R.; Errede, S.; Esham, B.; Eusebi, R.; Farrington, S.; Fernández Ramos, J. P.; Field, R.; Flanagan, G.; Forrest, R.; Franklin, M.; Freeman, J. C.; Frisch, H.; Funakoshi, Y.; Garfinkel, A. F.; Garosi, P.; Gerberich, H.; Gerchtein, E.; Giagu, S.; Giakoumopoulou, V.; Gibson, K.; Ginsburg, C. M.; Giokaris, N.; Giromini, P.; Giurgiu, G.; Glagolev, V.; Glenzinski, D.; Gold, M.; Goldin, D.; Golossanov, A.; Gomez, G.; Gomez-Ceballos, G.; Goncharov, M.; González López, O.; Gorelov, I.; Goshaw, A. T.; Goulianos, K.; Gramellini, E.; Grinstein, S.; Grosso-Pilcher, C.; Group, R. C.; Guimaraes da Costa, J.; Hahn, S. R.; Han, J. Y.; Happacher, F.; Hara, K.; Hare, M.; Harr, R. F.; Harrington-Taber, T.; Hatakeyama, K.; Hays, C.; Heinrich, J.; Herndon, M.; Hocker, A.; Hong, Z.; Hopkins, W.; Hou, S.; Hughes, R. E.; Husemann, U.; Hussein, M.; Huston, J.; Introzzi, G.; Iori, M.; Ivanov, A.; James, E.; Jang, D.; Jayatilaka, B.; Jeon, E. J.; Jindariani, S.; Jones, M.; Joo, K. K.; Jun, S. Y.; Junk, T. R.; Kambeitz, M.; Kamon, T.; Karchin, P. E.; Kasmi, A.; Kato, Y.; Ketchum, W.; Keung, J.; Kilminster, B.; Kim, D. H.; Kim, H. S.; Kim, J. E.; Kim, M. J.; Kim, S. B.; Kim, S. H.; Kim, Y. K.; Kim, Y. J.; Kimura, N.; Kirby, M.; Knoepfel, K.; Kondo, K.; Kong, D. J.; Konigsberg, J.; Kotwal, A. V.; Kreps, M.; Kroll, J.; Kruse, M.; Kuhr, T.; Kurata, M.; Laasanen, A. T.; Lammel, S.; Lancaster, M.; Lannon, K.; Latino, G.; Lee, H. S.; Lee, J. S.; Leo, S.; Leone, S.; Lewis, J. D.; Limosani, A.; Lipeles, E.; Liu, H.; Liu, Q.; Liu, T.; Lockwitz, S.; Loginov, A.; Lucchesi, D.; Lueck, J.; Lujan, P.; Lukens, P.; Lungu, G.; Lys, J.; Lysak, R.; Madrak, R.; Maestro, P.; Malik, S.; Manca, G.; Manousakis-Katsikakis, A.; Margaroli, F.; Marino, P.; Martínez, M.; Matera, K.; Mattson, M. E.; Mazzacane, A.; Mazzanti, P.; McNulty, R.; Mehta, A.; Mehtala, P.; Mesropian, C.; Miao, T.; Mietlicki, D.; Mitra, A.; Miyake, H.; Moed, S.; Moggi, N.; Moon, C. S.; Moore, R.; Morello, M. J.; Mukherjee, A.; Muller, Th.; Murat, P.; Mussini, M.; Nachtman, J.; Nagai, Y.; Naganoma, J.; Nakano, I.; Napier, A.; Nett, J.; Neu, C.; Nigmanov, T.; Nodulman, L.; Noh, S. Y.; Norniella, O.; Oakes, L.; Oh, S. H.; Oh, Y. D.; Oksuzian, I.; Okusawa, T.; Orava, R.; Ortolan, L.; Pagliarone, C.; Palencia, E.; Palni, P.; Papadimitriou, V.; Parker, W.; Pauletta, G.; Paulini, M.; Paus, C.; Phillips, T. J.; Piacentino, G.; Pianori, E.; Pilot, J.; Pitts, K.; Plager, C.; Pondrom, L.; Poprocki, S.; Potamianos, K.; Prokoshin, F.; Pranko, A.; Ptohos, F.; Punzi, G.; Ranjan, N.; Redondo Fernández, I.; Renton, P.; Rescigno, M.; Riddick, T.; Rimondi, F.; Ristori, L.; Robson, A.; Rodriguez, T.; Rolli, S.; Ronzani, M.; Roser, R.; Rosner, J. L.; Ruffini, F.; Ruiz, A.; Russ, J.; Rusu, V.; Safonov, A.; Sakumoto, W. K.; Sakurai, Y.; Santi, L.; Sato, K.; Saveliev, V.; Savoy-Navarro, A.; Schlabach, P.; Schmidt, E. E.; Schwarz, T.; Scodellaro, L.; Scuri, F.; Seidel, S.; Seiya, Y.; Semenov, A.; Sforza, F.; Shalhout, S. Z.; Shears, T.; Shepard, P. F.; Shimojima, M.; Shochet, M.; Shreyber-Tecker, I.; Simonenko, A.; Sinervo, P.; Sliwa, K.; Smith, J. R.; Snider, F. D.; Sorin, V.; Song, H.; Stancari, M.; St. Denis, R.; Stelzer, B.; Stelzer-Chilton, O.; Stentz, D.; Strologas, J.; Sudo, Y.; Sukhanov, A.; Suslov, I.; Takemasa, K.; Takeuchi, Y.; Tang, J.; Tecchio, M.; Teng, P. K.; Thom, J.; Thomson, E.; Thukral, V.; Toback, D.; Tokar, S.; Tollefson, K.; Tomura, T.; Tonelli, D.; Torre, S.; Torretta, D.; Totaro, P.; Trovato, M.

    2013-03-01

    This Letter reports a search for a narrow resonant state decaying into two W bosons and two b quarks where one W boson decays leptonically and the other decays into a quark-antiquark pair. The search is particularly sensitive to top-antitop resonant production. We use the full data sample of proton-antiproton collisions at a center-of-mass energy of 1.96 TeV collected by the CDF II detector at the Fermilab Tevatron, corresponding to an integrated luminosity of 9.45fb-1. No evidence for resonant production is found, and upper limits on the production cross section times branching ratio for a narrow resonant state are extracted. Within a specific benchmark model, we exclude a Z' boson with mass, MZ', below 915GeV/c2 decaying into a top-antitop pair at the 95% credibility level assuming a Z' boson decay width of ?Z'=0.012MZ'. This is the most sensitive search for a narrow qq¯-initiated tt¯ resonance in the mass region below 750GeV/c2.

  15. Search for Resonances Decaying to Top and Bottom Quarks with the CDF Experiment

    E-print Network

    CDF Collaboration; T. Aaltonen; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; F. Anza'; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; L. Bianchi; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; P. Butti; A. Buzatu; A. Calamba; S. Camarda; M. Campanelli; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; K. Cho; D. Chokheli; A. Clark; C. Clarke; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; M. Cremonesi; D. Cruz; J. Cuevas; R. Culbertson; N. d'Ascenzo; M. Datta; P. de Barbaro; L. Demortier; L. Marchese; M. Deninno; F. Devoto; M. D'Errico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; M. Dorigo; A. Driutti; K. Ebina; R. Edgar; A. Elagin; R. Erbacher; S. Errede; B. Esham; S. Farrington; J. P. Fernández Ramos; R. Field; G. Flanagan; R. Forrest; M. Franklin; J. C. Freeman; H. Frisch; Y. Funakoshi; C. Galloni; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. González López; I. Gorelov; A. T. Goshaw; K. Goulianos; E. Gramellini; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; J. Y. Han; F. Happacher; K. Hara; M. Hare; R. F. Harr; T. Harrington-Taber; K. Hatakeyama; C. Hays; J. Heinrich; M. Herndon; A. Hocker; Z. Hong; W. Hopkins; S. Hou; R. E. Hughes; U. Husemann; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; M. Kambeitz; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; Y. J. Kim; N. Kimura; M. Kirby; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; M. Kruse; T. Kuhr; M. Kurata; A. T. Laasanen; S. Lammel; M. Lancaster; K. Lannon; G. Latino; H. S. Lee; J. S. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; E. Lipeles; A. Lister; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; A. Lucà; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; P. Marino; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; C. S. Moon; R. Moore; M. J. Morello; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; T. Nigmanov; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; C. Pagliarone; E. Palencia; P. Palni; V. Papadimitriou; W. Parker; G. Pauletta; M. Paulini; C. Paus; T. J. Phillips; G. Piacentino; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; F. Prokoshin; A. Pranko; F. Ptohos; G. Punzi; I. Redondo Fernández; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodriguez; S. Rolli; M. Ronzani; R. Roser; J. L. Rosner; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; E. E. Schmidt; T. Schwarz; L. Scodellaro; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; K. Sliwa; J. R. Smith; F. D. Snider; V. Sorin; H. Song; M. Stancari; R. St. Denis; D. Stentz; J. Strologas; Y. Sudo; A. Sukhanov; I. Suslov; K. Takemasa; Y. Takeuchi; J. Tang; M. Tecchio; P. K. Teng; J. Thom; E. Thomson; V. Thukral; D. Toback; S. Tokar; K. Tollefson; T. Tomura; D. Tonelli; S. Torre; D. Torretta; P. Totaro; M. Trovato; F. Ukegawa; S. Uozumi; F. Vázquez; G. Velev; C. Vellidis; C. Vernieri; M. Vidal; R. Vilar; J. Vizán; M. Vogel; G. Volpi; P. Wagner; R. Wallny; S. M. Wang; D. Waters; W. C. Wester III; D. Whiteson; A. B. Wicklund; S. Wilbur; H. H. Williams; J. S. Wilson; P. Wilson; B. L. Winer; P. Wittich; S. Wolbers; H. Wolfe; T. Wright; X. Wu; Z. Wu; K. Yamamoto; D. Yamato; T. Yang; U. K. Yang; Y. C. Yang; W. -M. Yao; G. P. Yeh; K. Yi; J. Yoh; K. Yorita; T. Yoshida; G. B. Yu; I. Yu; A. M. Zanetti; Y. Zeng; C. Zhou; S. Zucchelli

    2015-04-07

    We report on a search for charged massive resonances decaying to top ($t$) and bottom ($b$) quarks in the full data set of proton-antiproton collisions at center-of-mass energy of $\\sqrt{s} = 1.96$ TeV collected by the CDF~II detector at the Tevatron, corresponding to an integrated luminosity of 9.5 $fb^{-1}$. No significant excess above the standard model (SM) background prediction is observed. We set 95% Bayesian credibility mass-dependent upper limits on the heavy charged particle production cross section times branching ratio to $t b$. Using a SM extension with a $W^{\\prime}$ and left-right-symmetric couplings as a benchmark model, we constrain the $W^{\\prime}$ mass and couplings in the 300 to 900 GeV/$c^2$ range. The limits presented here are the most stringent for a charged resonance with mass in the range 300 -- 600 GeV/$c^2$ decaying to top and bottom quarks.

  16. Quark and Lepton Hybrids? A search for resonance decays to lepton+jet and limits on leptoquarks at

    E-print Network

    Quark and Lepton Hybrids? A search for resonance decays to lepton+jet and limits on leptoquarks energies than achieved ever before. Since the proton contains quarks, this means that at HERA we see the most energetic quark-electron collisions ever observed. Electrons belong to a class of particles known

  17. Search for resonant production of tt? decaying to jets in pp? collisions at ?{s}=1.96 TeV

    DOE PAGESBeta

    Aaltonen, T; Alvarez Gonzalez, B; Cantabria Inst. of Phys.; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, J A; et al

    2011-10-11

    This Letter reports a search for non-standard model topquark resonances, Z', decaying to ttMs; ?W+bW-b? , where both W decay to quarks. We examine the top-antitop quark invariant mass spectrum for the presence of narrow resonant states. The search uses a data sample of p{bar p} collisions at a center of mass energy of 1.96 TeV collected by the CDF II detector at the Fermilab Tevatron, with an integrated luminosity of 2.8 fb-1. No evidence for top-antitop quark resonant production is found. We place upper limits on the production cross section times branching ratio for a specific topcolor assisted technicolormore »model with width of ?Z' = 0.012 MZ'. Within this model, we exclude Z' boson with masses below 805 GeV/c2 at the 95% confidence level.« less

  18. Possibility of Narrow High-Mass Exotic States

    E-print Network

    Marek Karliner; Harry J. Lipkin

    2007-10-22

    Narrow high-mass states can arise despite large phase space when two nearly degenerate states are coupled to the same dominant decay mode. Mixing via a final-state interaction loop diagram can produce one very broad state and one narrow state. Such a situation is generic in exotic hadrons where a color singlet with given flavor and spin quantum numbers can be constructed with two distinct internal color couplings of quarks. The simplest realization of this idea are the (Q Qbar q qbar) tetraquarks containing two heavy and two light quarks. We discuss possible experimental implications, including recent data from Belle.

  19. Search for production of resonances decaying to a lepton, neutrino and jets in collisions at TeV with the ATLAS detector

    NASA Astrophysics Data System (ADS)

    Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Adelman, J.; Adomeit, S.; Adye, T.; Agatonovic-Jovin, T.; Aguilar-Saavedra, J. A.; Agustoni, M.; Ahlen, S. P.; Ahmadov, F.; Aielli, G.; Akerstedt, H.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alberghi, G. L.; Albert, J.; Albrand, S.; Alconada Verzini, M. J.; Aleksa, M.; Aleksandrov, I. N.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Alimonti, G.; Alio, L.; Alison, J.; Allbrooke, B. M. M.; Allison, L. J.; Allport, P. P.; Aloisio, A.; Alonso, A.; Alonso, F.; Alpigiani, C.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amaral Coutinho, Y.; Amelung, C.; Amidei, D.; Amor Dos Santos, S. P.; Amorim, A.; Amoroso, S.; Amram, N.; Amundsen, G.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Anduaga, X. S.; Angelidakis, S.; Angelozzi, I.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A. V.; Anjos, N.; Annovi, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aperio Bella, L.; Arabidze, G.; Arai, Y.; Araque, J. P.; Arce, A. T. H.; Arduh, F. A.; Arguin, J.-F.; Argyropoulos, S.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnold, H.; Arratia, M.; Arslan, O.; Artamonov, A.; Artoni, G.; Asai, S.; Asbah, N.; Ashkenazi, A.; Åsman, B.; Asquith, L.; Assamagan, K.; Astalos, R.; Atkinson, M.; Atlay, N. B.; Auerbach, B.; Augsten, K.; Aurousseau, M.; Avolio, G.; Axen, B.; Ayoub, M. K.; Azuelos, G.; Baak, M. A.; Baas, A. E.; Bacci, C.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Bagiacchi, P.; Bagnaia, P.; Bai, Y.; Bain, T.; Baines, J. T.; Baker, O. K.; Balek, P.; Balestri, T.; Balli, F.; Banas, E.; Banerjee, Sw.; Bannoura, A. A. E.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barberio, E. L.; Barberis, D.; Barbero, M.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnes, S. L.; Barnett, B. M.; Barnett, R. M.; Barnovska, Z.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Bartoldus, R.; Barton, A. E.; Bartos, P.; Bassalat, A.; Basye, A.; Bates, R. L.; Batista, S. J.; Batley, J. R.; Battaglia, M.; Bauce, M.; Bauer, F.; Bawa, H. S.; Beacham, J. B.; Beattie, M. D.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, S.; Beckingham, M.; Becot, C.; Beddall, A. J.; Beddall, A.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Beermann, T. A.; Begel, M.; Behr, J. K.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellomo, M.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bender, M.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Bensinger, J. R.; Bentvelsen, S.; Beresford, L.; Beretta, M.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Beringer, J.; Bernard, C.; Bernard, N. R.; Bernius, C.; Bernlochner, F. U.; Berry, T.; Berta, P.; Bertella, C.; Bertoli, G.; Bertolucci, F.; Bertsche, C.; Bertsche, D.; Besana, M. I.; Besjes, G. J.; Bessidskaia Bylund, O.; Bessner, M.; Besson, N.; Betancourt, C.; Bethke, S.; Bevan, A. J.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Biglietti, M.; Bilbao De Mendizabal, J.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Black, C. W.; Black, J. E.; Black, K. M.; Blackburn, D.; Blair, R. E.; Blanchard, J.-B.; Blanco, J. E.; Blazek, T.; Bloch, I.; Blocker, C.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Bock, C.; Boddy, C. R.; Boehler, M.; Bogaerts, J. A.; Bogdanchikov, A. G.; Bohm, C.; Boisvert, V.; Bold, T.; Boldea, V.; Boldyrev, A. S.; Bomben, M.; Bona, M.; Boonekamp, M.; Borisov, A.; Borissov, G.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boudreau, J.; Bouffard, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boutouil, S.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozic, I.; Bracinik, J.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brendlinger, K.; Brennan, A. J.; Brenner, L.; Brenner, R.; Bressler, S.; Bristow, K.; Bristow, T. M.; Britton, D.; Britzger, D.; Brochu, F. M.; Brock, I.; Brock, R.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brosamer, J.; Brost, E.; Brown, J.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Bruni, A.; Bruni, G.; Bruschi, M.; Bryngemark, L.; Buanes, T.; Buat, Q.; Bucci, F.; Buchholz, P.; Buckley, A. G.; Buda, S. I.; Budagov, I. A.

    2015-05-01

    A search is presented for narrow diboson resonances decaying to or in the final state where one boson decays leptonically (to an electron or a muon plus a neutrino) and the other boson decays hadronically. The analysis is performed using an integrated luminosity of 20.3 fb of collisions at TeV collected by the ATLAS detector at the large hadron collider. No evidence for resonant diboson production is observed, and resonance masses below 700 and 1490 GeV are excluded at 95 % confidence level for the spin-2 Randall-Sundrum bulk graviton with coupling constant of 1.0 and the extended gauge model boson respectively.

  20. Time modulation of K-electron capture decay of hydrogen-like ions with multiphoton resonance transitions

    SciTech Connect

    Pavlichenkov, I. M. [Russian Research Center 'Kurchatov Institute', Moscow 123182 (Russian Federation)

    2010-05-15

    Multiphoton resonance transitions between ground hyperfine states are used for time modulation of the electron capture decay of hydrogen-like ions with the Gamow-Teller transition 1{sup +}->0{sup +}. The proposed mechanism offers a time oscillating decay with a frequency of up to 0.1 Hz. An experiment to observe the modulation is proposed for ions stored in a Penning trap. An attempt to understand the Gesellschaft fuer Schwerionenforschung mbH (GSI) anomaly with multiple photon transitions is made.

  1. Photoabsorption and subsequent decay of Na and Mg atoms in the 2s-np autoionizing resonance region

    Microsoft Academic Search

    T. Osawa; Y. Tohyama; S. Obara; T. Nagata; Y. Azuma; F. Koike

    2008-01-01

    Photoabsorption and subsequent decay of Na and Mg atoms have been studied experimentally in the vicinity of the 2s excitation region. The charge-separated photoion-yield method using monochromatized synchrotron radiation was employed to detect the resonance excitation features separately in the single and double ionization channels. The photoion-yield spectrum of each atomic species consists of asymmetric features from the 2s-1np autoionizing

  2. High Mass Accuracy and High Mass Resolving Power FT-ICR Secondary Ion Mass Spectrometry for Biological Tissue Imaging

    SciTech Connect

    Smith, Donald F.; Kiss, Andras; Leach, Franklin E.; Robinson, Errol W.; Pasa-Tolic, Ljiljana; Heeren, Ronald M.

    2013-07-01

    Biological tissue imaging by secondary ion mass spectrometry has seen rapid development with the commercial availability of polyatomic primary ion sources. Endogenous lipids and other small bio-molecules can now be routinely mapped on the micrometer scale. Such experiments are typically performed on time-of-flight mass spectrometers for high sensitivity and high repetition rate imaging. However, such mass analyzers lack the mass resolving power to ensure separation of isobaric ions and the mass accuracy for exact mass elemental formula assignment. We have recently reported a secondary ion mass spectrometer with the combination of a C60 primary ion gun with a Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) for high mass resolving power, high mass measurement accuracy and tandem mass spectrometry capabilities. In this work, high specificity and high sensitivity secondary ion FT-ICR MS was applied to chemical imaging of biological tissue. An entire rat brain tissue was measured with 150 ?m spatial resolution (75 ?m primary ion spot size) with mass resolving power (m/?m50%) of 67,500 (at m/z 750) and root-mean-square measurement accuracy less than two parts-per-million for intact phospholipids, small molecules and fragments. For the first time, ultra-high mass resolving power SIMS has been demonstrated, with m/?m50% > 3,000,000. Higher spatial resolution capabilities of the platform were tested at a spatial resolution of 20 ?m. The results represent order of magnitude improvements in mass resolving power and mass measurement accuracy for SIMS imaging and the promise of the platform for ultra-high mass resolving power and high spatial resolution imaging.

  3. High mass accuracy and high mass resolving power FT-ICR secondary ion mass spectrometry for biological tissue imaging.

    PubMed

    Smith, Donald F; Kiss, Andras; Leach, Franklin E; Robinson, Errol W; Paša-Toli?, Ljiljana; Heeren, Ron M A

    2013-07-01

    Biological tissue imaging by secondary ion mass spectrometry has seen rapid development with the commercial availability of polyatomic primary ion sources. Endogenous lipids and other small bio-molecules can now be routinely mapped on the sub-micrometer scale. Such experiments are typically performed on time-of-flight mass spectrometers for high sensitivity and high repetition rate imaging. However, such mass analyzers lack the mass resolving power to ensure separation of isobaric ions and the mass accuracy for elemental formula assignment based on exact mass measurement. We have recently reported a secondary ion mass spectrometer with the combination of a C60 primary ion gun with a Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) for high mass resolving power, high mass measurement accuracy, and tandem mass spectrometry capabilities. In this work, high specificity and high sensitivity secondary ion FT-ICR MS was applied to chemical imaging of biological tissue. An entire rat brain tissue was measured with 150 ?m spatial resolution (75 ?m primary ion spot size) with mass resolving power (m/?m(50%)) of 67,500 (at m/z 750) and root-mean-square measurement accuracy less than two parts-per-million for intact phospholipids, small molecules and fragments. For the first time, ultra-high mass resolving power SIMS has been demonstrated, with m/?m(50%)?>?3,000,000. Higher spatial resolution capabilities of the platform were tested at a spatial resolution of 20 ?m. The results represent order of magnitude improvements in mass resolving power and mass measurement accuracy for SIMS imaging and the promise of the platform for ultra-high mass resolving power and high spatial resolution imaging. PMID:23685962

  4. A 2-D Sensitivity Study in Searching for a High Mass Z' Boson at ?{ s} = 8 TeV with the Dielectron Channel Using the ATLAS Detector

    NASA Astrophysics Data System (ADS)

    Vermeersch, Aaron

    2014-03-01

    A possible signature of physics beyond the Standard Model could be the observation of an additional neutral, heavy boson such as the Z'. The signal would present itself in the invariant mass spectrum through its decay to dilepton pairs as a resonance on an otherwise irreducible falling background from the Drell-Yan process. Currently at ATLAS, the search for this resonance relies on the invariant mass as the discriminating variable. However, this neglects the potential increase in sensitivity due to the expected angular distributions which stem from the new physics. A sensitivity study was conducted that shows the expected mass limits for two different search scenarios in the high mass region, one using the invariant mass of the dielectron pair and another that is dependent on angular variables, for multiple benchmark Z' models.

  5. Interference effects between 2p photoionization and resonant Auger decay channels at 2s-1np (n=4,5) inner-shell resonances in Ar

    Microsoft Academic Search

    R. Sankari; A. Kivimäki; M. Huttula; T. Matila; H. Aksela; S. Aksela; M. Coreno; G. Turri; R. Camilloni; M. de Simone; K. C. Prince

    2002-01-01

    The electron spectrum of Ar has been studied in the binding energy region of the 2p-13p-1np states. These states are populated in direct 2p photoionization accompanied by the 3p-->np shake-up transitions. In addition, at photon energies corresponding to the 2s-->4p,5p excitations they gain intensity through the 2s-1np-->2p-13p-1np resonant Auger decay channels. The two channels can interfere, leading to changes in

  6. Search for Dilepton Resonances in pp Collisions at ?s=7??TeV with the ATLAS Detector

    E-print Network

    Taylor, Frank E.

    This Letter reports on a search for narrow high-mass resonances decaying into dilepton final states. The data were recorded by the ATLAS experiment in pp collisions at ?s=7??TeV at the Large Hadron Collider and correspond ...

  7. High mass star formation in the galaxy

    NASA Technical Reports Server (NTRS)

    Scoville, N. Z.; Good, J. C.

    1987-01-01

    The Galactic distributions of HI, H2, and HII regions are reviewed in order to elucidate the high mass star formation occurring in galactic spiral arms and in active galactic nuclei. Comparison of the large scale distributions of H2 gas and radio HII regions reveals that the rate of formation of OB stars depends on (n sub H2) sup 1.9 where (n sub H2) is the local mean density of H2 averaged over 300 pc scale lengths. In addition the efficiency of high mass star formation is a decreasing function of cloud mass in the range 200,000 to 3,000,000 solar mass. These results suggest that high mass star formation in the galactic disk is initiated by cloud-cloud collisions which are more frequent in the spiral arms due to orbit crowding. Cloud-cloud collisions may also be responsible for high rates of OB star formation in interacting galaxies and galactic nuclei. Based on analysis of the Infrared Astronomy Satellite (IRAS) and CO data for selected GMCs in the Galaxy, the ratio L sub IR/M sub H2 can be as high as 30 solar luminosity/solar mass for GMCs associated with HII regions. The L sub IR/M sub H2 ratios and dust temperature obtained in many of the high luminosity IRAS galaxies are similar to those encountered in galactic GMCs with OB star formation. High mass star formation is therefore a viable explanation for the high infrared luminosity of these galaxies.

  8. Formation of a three-dimensional plasma boundary after decay of the plasma response to resonant magnetic perturbation fields

    NASA Astrophysics Data System (ADS)

    Schmitz, O.; Evans, T. E.; Fenstermacher, M. E.; Lanctot, M. J.; Lasnier, C. L.; Mordijck, S.; Moyer, R. A.; Reimerdes, H.; the DIII-D Team

    2014-01-01

    First time experimental evidence is presented for a direct link between the decay of a n = 3 plasma response and the formation of a three-dimensional (3D) plasma boundary. We inspect a lower single-null L-mode plasma which first reacts at sufficiently high rotation with an ideal resonant screening response to an external toroidal mode number n = 3 resonant magnetic perturbation field. Decay of this response due to reduced bulk plasma rotation changes the plasma state considerably. Signatures such as density pump out and a spin up of the edge rotation—which are usually connected to formation of a stochastic boundary—are detected. Coincident, striation of the divertor single ionized carbon emission and a 3D emission structure in double ionized carbon at the separatrix is seen. The striated C II pattern follows in this stage the perturbed magnetic footprint modelled without a plasma response (vacuum approach). This provides for the first time substantial experimental evidence, that a 3D plasma boundary with direct impact on the divertor particle flux pattern is formed as soon as the internal plasma response decays. The resulting divertor structure follows the vacuum modelled magnetic field topology. However, the inward extension of the perturbed boundary layer can still not directly be determined from these measurements.

  9. Studies of Simultaneous Three-electron Decay and of Triply Excited Resonances in K-shell Photodetachment of He^-

    NASA Astrophysics Data System (ADS)

    Bilodeau, R. C.; Turri, G.; Berrah, N.; Ackerman, G. D.; Aguilar, A.; Bozek, J. D.

    2003-05-01

    Previous core-photodetachment studies of He^- showed a strong discrepancy with accepted theory [1], attracting considerable additional theoretical interest. These new theoretical studies include ab initio calculations of triply-excited quartet states and the 2s2p^2 ^4P state of He^-, located just below the 1s threshold [2,3]. Measured positions, widths, and strengths of these resonances provide a sensitive test for these new calculations. We will present recent high-resolution measurements of the suspected triply-excited He^- resonances, as well as measurements of the absolute double-detachment cross sections in He^- obtained at the ALS. In addition, the He^- 2s2p^2 ^4P resonant state was observed to decay to the He^+ 1s ground state. This represents the first evidence of a simultaneous 3-electron decay process in a core-excited negative ion. [1] Berrah et al., Phys. Rev. Lett. 88, 093001 (2002). [2] Sanz-Vicario et al., Phys. Rev. A 66, 052713 (2002). [3] Zatsarinny et al., J. Phys. B 35, 4161 (2002).

  10. LETTER TO THE EDITOR: Core polarization effects in the decay of 1s -->np (n = 2-6) resonantly excited beryllium

    Microsoft Academic Search

    J. Jiménez-Mier; S. B. Whitfield; R. Wehlitz; H. Díaz-Jiménez

    2001-01-01

    The photoelectron angular distribution parameter of the relevant decay channels following the resonant 1s -->np (n = 2-6) excitations in beryllium was measured. The 2s and 3s photoelectrons present at the 2p and 3p resonances, respectively, have beta = 2 as predicted by theory. For the mp' spectator channels, small but distinct deviations from the expected complete isotropy were found.

  11. Dark photons and resonant monophoton signatures in Higgs boson decays at the LHC

    E-print Network

    Emidio Gabrielli; Matti Heikinheimo; Barbara Mele; Martti Raidal

    2014-09-23

    Motivated by dark-photon $\\bar{\\gamma}$ scenarios extensively considered in the literature, we explore experimentally allowed models where the Higgs boson coupling to photon and dark photon $H\\gamma\\bar{\\gamma}$ can be enhanced. Correspondingly, large rates for the $H\\to \\gamma\\bar \\gamma$ decay become plausible, giving rise to one monochromatic photon with $E^{\\gamma}\\simeq m_H/2$ (i.e., more than twice the photon energy in the rare standard-model decay $H\\to \\gamma Z\\to\\gamma\\bar\

  12. A Statistical method for the study of beta decay giant resonances

    Microsoft Academic Search

    Kamales Kar

    1981-01-01

    Instead of the semi-empirical theory for estimating the beta-decay strength function, due to Takahashi and Yamada, we consider a formal theory, that of spectral distributions. This theory gives the strength as a bilinear expansion in polynomials, defined by the spectra in the initial and final model spaces, as recently outlined by Draayer, French and Wong. This formally exact theory is

  13. A study of the hadronic resonance structure in the decay ??3 ?? ?

    Microsoft Academic Search

    P. Abreu; W. Adam; T. Adye; P. Adzic; G. D. Alekseev; R. Alemany; P. P. Allport; S. Almehed; U. Amaldi; S. Amato; P. Andersson; A. Andreazza; P. Antilogus; W. D. Apel; Y. Arnoud; B. Åsman; J. E. Augustin; A. Augustinus; P. Baillon; P. Bambade; F. Barao; G. Barbiellini; R. Barbier; D. Y. Bardin; G. Barker; A. Baroncelli; O. Barring; M. J. Bates; M. Battaglia; M. Baubillier; K. H. Becks; M. Begalli; P. Beilliere; Yu. Belokopytov; K. Belous; A. C. Benvenuti; C. Berat; M. Berggren; D. Bertini; D. Bertrand; M. Besancon; F. Bianchi; M. Bigi; M. S. Bilenky; M. A. Bizouard; D. Bloch; M. Bonesini; W. Bonivento; M. Boonekamp; P. S. L. Booth; A. W. Borgland; G. Borisov; C. Bosio; O. Botner; E. Boudinov; B. Bouquet; C. Bourdarios; T. J. V. Bowcock; I. Boyko; I. Bozovic; M. Bozzo; P. Branchini; K. D. Brand; T. Brenke; R. A. Brenner; R. Brown; P. Bruckman; J. M. Brunet; L. Bugge; T. Buran; T. Burgsmueller; P. Buschmann; S. Cabrera; M. Caccia; M. Calvi; A. J. Camacho Rozas; T. Camporesi; V. Canale; M. Canepa; F. Carena; L. Carroll; C. Caso; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; Ch. Cerruti; V. Chabaud; M. Chapkin; Ph. Charpentier; L. Chaussard; P. Checchia; G. A. Chelkov; M. Chen; R. Chierici; P. Chliapnikov; P. Chochula; V. Chorowicz; J. Chudoba; K. Cieslik; P. Collins; M. Colomer; R. Contri; E. Cortina; G. Cosme; F. Cossutti; J. H. Cowell; H. B. Crawley; D. Crennell; G. Crosetti; J. Cuevas Maestro; S. Czellar; B. Dalmagne; G. Damgaard; P. D. Dauncey; M. Davenport; W. Da Silva; A. Deghorain; G. Della Ricca; P. Delpierre; N. Demaria; A. De Angelis; W. De Boer; S. De Brabandere; C. De Clercq; B. De Lotto; A. De Min; L. De Paula; H. Dijkstra; L. Di Ciaccio; A. Di Diodato; A. Djannati; J. Dolbeau; K. Doroba; M. Dracos; J. Drees; K.-A. Drees; M. Dris; A. Duperrin; J. D. Durand; D. Edsall; R. Ehret; G. Eigen; T. Ekelof; G. Ekspong; M. Ellert; M. Elsing; J. P. Engel; B. Erzen; E. Falk; G. Fanourakis; D. Fassouliotis; J. Fayot; M. Feindt; P. Ferrari; A. Ferrer; S. Fichet; A. Firestone; P.-A. Fischer; U. Flagmeyer; H. Foeth; E. Fokitis; F. Fontanelli; B. Franek; A. G. Frodesen; R. Fruhwirth; F. Fulda-Quenzer; J. Fuster; A. Galloni; D. Gamba; M. Gandelman; C. Garcia; J. Garcia; C. Gaspar; M. Gaspar; U. Gasparini; Ph. Gavillet; E. N. Gazis; D. Gele; J. P. Gerber; L. Gerdyukov; N. Ghodbane; F. Glege; R. Gokieli; B. Golob; P. Goncalves; I. Gonzalez Caballero; G. Gopal; L. Gorn; M. Gorski; V. Gracco; J. Grahl; E. Graziani; C. Green; A. Grefrath; P. Gris; G. Grosdidier; K. Grzelak; M. Gunther; J. Guy; F. Hahn; S. Hahn; S. Haider; A. Hallgren; K. Hamacher; F. J. Harris; V. Hedberg; S. Heising; R. Henriques; J. J. Hernandez; P. Herquet; H. Herr; T. L. Hessing; J.-M. Heuser; E. Higon; S. O. Holmgren; P. J. Holt; D. Holthuizen; S. Hoorelbeke; M. Houlden; J. Hrubec; K. Huet; K. Hultqvist; J. N. Jackson; R. Jacobsson; P. Jalocha; R. Janik; Ch. Jarlskog; G. Jarlskog; P. Jarry; B. Jean-Marie; E. K. Johansson; L. Jonsson; P. Jonsson; C. Joram; P. Juillot; F. Kapusta; K. Karafasoulis; S. Katsanevas; E. C. Katsoufis; R. Keranen; Yu. Khokhlov; B. A. Khomenko; N. N. Khovanski; B. King; N. J. Kjaer; O. Klapp; H. Klein; P. Kluit; D. Knoblauch; P. Kokkinias; M. Koratzinos; V. Kostioukhine; C. Kourkoumelis; O. Kouznetsov; M. Krammer; C. Kreuter; I. Kronkvist; Z. Krumstein; P. Kubinec; W. Kucewicz; K. Kurvinen; C. Lacasta; J. W. Lamsa; L. Lanceri; P. Langefeld; J. P. Laugier; R. Lauhakangas; G. Leder; F. Ledroit; V. Lefebure; C. K. Legan; A. Leisos; R. Leitner; J. Lemonne; G. Lenzen; V. Lepeltier; T. Lesiak; M. Lethuillier; J. Libby; D. Liko; A. Lipniacka; I. Lippi; B. Loerstad; J. G. Loken; J. H. Lopes; J. M. Lopez; D. Loukas; P. Lutz; L. Lyons; J. MacNaughton; G. Maehlum; J. R. Mahon; A. Maio; A. Malek; T. G. M. Malmgren; V. Malychev; F. Mandl; J. Marco; R. Marco; B. Marechal; M. Margoni; J. C. Marin; C. Mariotti; A. Markou; C. Martinez-Rivero; F. Martinez-Vidal; S. Marti i Garcia; J. Masik; F. Matorras; C. Matteuzzi; G. Matthiae; F. Mazzucato; M. Mazzucato; M. Mc Cubbin; R. Mc Kay; R. Mc Nulty; G. Mc Pherson; J. Medbo; C. Meroni; W. T. Meyer; A. Miagkov; M. Michelotto; E. Migliore; L. Mirabito; W. A. Mitaroff; U. Mjoernmark; T. Moa; R. Moeller; K. Moenig; M. R. Monge; X. Moreau; P. Morettini; H. Mueller; K. Muenich; M. Mulders; L. M. Mundim; W. J. Murray; B. Muryn; G. Myatt; T. Myklebust; F. Naraghi; F. L. Navarria; S. Navas; K. Nawrocki; P. Negri; S. Nemecek; N. Neufeld; W. Neumann; N. Neumeister; R. Nicolaidou; B. S. Nielsen; M. Nieuwenhuizen; V. Nikolaenko; M. Nikolenko; P. Niss; A. Nomerotski; A. Normand; A. Nygren; W. Oberschulte-Beckmann; V. Obraztsov; A. G. Olshevski; A. Onofre; R. Orava; G. Orazi; K. Osterberg; A. Ouraou; P. Paganini; M. Paganoni; S. Paiano; R. Pain; R. Paiva; H. Palka; Th. D. Papadopoulou; K. Papageorgiou; L. Pape; C. Parkes; F. Parodi; U. Parzefall; A. Passeri

    1998-01-01

    The hadronic structure of the decay of the ? lepton to three charged particles, ??3???, is studied using data collected by the DELPHI detector at LEP between 1992 and 1995. The invariant mass of the 3? system, m3?, is fitted using the models of Kühn and Santamaria, Isgur, Morningstar and Reader, and Feindt. The 3? and ?+?? mass spectra are

  14. A study of the decays of tau leptons produced on the Z resonance at LEP

    Microsoft Academic Search

    P. Abreu; W. Adam; T. Adye; E. Agasi; G. D. Alekseev; P. Allen; S. Almehed; S. J. Alvsvaag; U. Amaldi; E. G. Anassontzis; A. Andreazza; P. Antilogus; W.-D. Apel; R. J. Apsimon; B. Åsman; J.-E. Augustin; A. Augustinus; P. Baillon; P. Bambade; F. Barao; R. Barate; G. Barbiellini; D. Y. Bardin; A. Baroncelli; O. Barring; J. A. Barrio; W. Bartl; M. Berggren; M. Battaglia; M. Baubillier; K.-H. Becks; C. J. Beeston; M. Begalli; P. Beilliere; Yu. Belokopytov; P. Beltran; D. Benedic; D. Bertrand; F. Bianchi; M. S. Bilenky; P. Billoir; J. Bjarne; D. Bloch; S. Blyth; V. Bocci; P. N. Bogolubov; T. Bolognese; M. Bonesini; W. Bonivento; P. S. L. Booth; P. Borgeaud; G. Borisov; H. Borner; C. Bosio; B. Bostjancic; S. Bosworth; O. Botner; B. Bouquet; C. Bourdarios; T. J. V. Bowcock; M. Bozzo; S. Braibant; P. Branchini; K. D. Brand; R. A. Brenner; H. Briand; C. Bricman; R. C. A. Brown; N. Brummer; J.-M. Brunet; L. Bugge; T. Buran; H. Burmeister; J. A. M. A. Buytaert; M. Caccia; M. Calvi; A. J. Camacho Rozas; T. Camporesi; V. Canale; F. Couchot; F. Carena; L. Carroll; Carlo Caso; Edoardo Castelli; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; L. Cerrito; V. Chabaud; A. Chan; Ph. Charpentier; L. Chaussard; J. Chauveau; P. Checchia; G. A. Chelkov; L. Chevalier; P V Chliapnikov; V. Chorowicz; J. T. M. Chrin; R. Cirio; M. P. Clara; P. Collins; J. L. Contreras; R. Contri; E. Cortina; G. Cosme; H. B. Crawley; D J Crennell; G. Crosetti; M. Crozon; J. Cuevas Maestro; S. Czellar; S. Dagoret; Erik Dahl-Jensen; B. Dalmagne; M. Dam; G. Damgaard; G. Darbo; Evelyne Daubie; A. Daum; P. D. Dauncey; Martyn Davenport; P. David; W. Da Silva; C. Defoix; D. Delikaris; B. A. Della Riccia; S. Delorme; P A Delpierre; N. Demaria; A. De Angelis; M. De Beer; H. De Boeck; Wim de Boer; C. De Clercq; M. D. M. De Fez Laso; N. De Groot; C. De La Vaissiere; B. De Lotto; A. De Min; H. Dijkstra; Lucia Di Ciaccio; F. Djama; J. Dolbeau; M. Donszelmann; K. Doroba; M. Dracos; J. Drees; M. Dris; Y. Dufour; L.-O. Eek; P. A.-M. Eerola; R. Ehret; T. Ekelof; G. Ekspong; A. Elliot Peisert; J.-P. Engel; D. Fassouliotis; T. A. Fearnley; Michael Feindt; A. Fenyuk; M. Fernandez Alonso; A. Ferrer; T. A. Filippas; A. Firestone; H. Foeth; E. Fokitis; F. Fontanelli; K. A. J. Forbes; B. Franek; P. Frenkiel; D. C. Fries; A. G. Frodesen; R. Fruhwirth; F. Fulda-Quenzer; K. Furnival; H. Furstenau; J. Fuster; G. Galeazzi; D. Gamba; C. Garcia; J. Garcia; C. Gaspar; U. Gasparini; Ph. Gavillet; E. N. Gazis; J.-P. Gerber; P. Giacomelli; R. Gokieli; B. Bolob; V. M. Golovatyuk; J. J. Gomez Y Cadenas; A. Goobar; G. Gopal; M. Gorski; V. Gracco; A. Grant; F. Grard; E. Graziani; G. Grosadidier; E. Gross; P. Grosse-Wiesmann; B. Grossetete; S. Gumenyuk; J. Guy; U. Haedinger; F. Hahn; M. Hahn; S. Haider; Z. Hajduk; A. Hakansson; K. Hamacher; G. Hamel De Monchenault; W. Hao; F. J. Harris; T. Henkes; J. J. Hernandez; P. Herquet; H. Herr; T. L. Hessing; I. Hietanen; C. O. Higgins; E. Higon; H. J. Hilke; S. D. Hodgson; T. Hofmokl; R. Holmes; S.-O. Holmgren; D. Holthuizen; P. F. Honore; J. E. Hooper; M. Houlden; P. O. Hulth; K. Hultqvist; P. Ioannou; D. Isenhower; P.-S. Iversen; J. N. Jackson; P. Jalocha; G. Jarlskog; B. Jean-Marie; E. K. Johansson; D. Johnson; M. Jonker; L. Jonsson; P. Juillot; G. Kalkanis; G. Kalmus; F. Kapusta; M. Karlsson; E. Karvelas; S. Katsanevas; E. C. Katsoufis; R. Keranen; J. Kesteman; B. A. Khomenko; N. N. Khovanski; J. J. Kjaer; H. Klein; W. Klempt; A. Klovning; P. Kluit; A. Koch-Mehrin; J. H. Koehne; B. Koene; P. Kokkinias; M. Kopf; K. Korcyl; A. V. Korytov; V. Kostioukhine; C. Kourkoumelis; O. Kouznetsov; P. H. Kramer; J. Krolikowski; I. Kronkvist; J. Krstic; U. Kruener-Marquis; W. Krupinski; K. Kulka; K. Kurvinen; C. Lacasta; C. Lambropoulos; J. W. Lamsa; L. Lanceri; V. Lapin; J.-P. Laugier; R. Lauhakangas; G. Leder; F. Ledroit; R. Leitner; Y. Lemoigne; J. Lemonne; G. Lenzen; V. Lepeltier; J. M. Levy; E. Lieb; D. Liko; E. Lillethun; J. Lindgren; R. Lindner; A. Lipniacka; I. Lippi; B. Loerstad; M. Lokajicek; J. G. Loken; A. Lopez-Fernandez; M. A. Lopez Aguera; M A López-Aguera; D. Loukas; J. J. Lozano; P. Lutz; L. Lyons; G. Maehlum; J. Maillard; A. Maltezos; F. Mandl; J. Marco; M. Margoni; J.-C. Marin; A. Markou; T. Maron; S. Marti; L. Mathis; F. Matorras; C. Matteuzzi; G. Matthiae; M. Mazzucato; M. McCubbin; R. Mc Kay; R. Mc Nulty; G. Meola; C. Meroni; W. T. Meyer; M. Michelotto; I. Mikulec; W. A. Mitaroff; G. V. Mitselmakher; U. Mjoernmark; T. Moa; R. Moeller; K. Moenig; M. R. Monge; P. Morettini; H. Mueller; W. J. Murray; B. Muryn; G. Myatt; F. Naraghi; F. L. Navarria; P. Negri; B. S. Nielsen; B. Nijjhar; V. Nikolaenko; P. E. S. Nilsen; P. Niss; V. Obraztsov; A. G. Olshevski; R. Orava; A. Ostankov; K. Osterberg; A. Ouraou; M. Paganoni; R. Pain; H. Palka; Th. D. Papadopoulou; L. Pape

    1992-01-01

    From the analysis of a data sample corresponding to an integrated luminosity of 4.63 pb-1 taken during the 1990 run of LEP at centre of mass energies between 88.2 GeV an 94.2 GeV, the tau decays\\u000a

  15. Dynamics of a phase conjugate resonator - Transient build-up and decay rates

    NASA Technical Reports Server (NTRS)

    Liu, S. R.; Indebetouw, G.

    1992-01-01

    The standard four wave mixing model in a sluggish photorefractive medium is employed to calculate the transient response of a phase conjugate resonator. General trends are revealed and discussed in view of the possible utilization of the system in image processing. Experimental results are given to confirm qualitatively the predicted behavior.

  16. Charged-Particle Decay from Giant Monopole Resonance in Si-28 

    E-print Network

    Toba, Y.; Lui, YW; Youngblood, David H.; Garg, U.; Grabmayr, P.; Knopfle, K. T.; Riedesel, H.; Wagner, G. J.

    1990-01-01

    , , 0.6? Q.4? 0.2? I 0.8? 0.6? iII I IP, ~P is O.2 ?.? a J aALQa I I 30 25 20 kl ~, I. i a. u I5 50 25 E?(MeV) 20 l5 FIG. 3. Spectrum of alpha particles measured at 0' in coincidence with decay to the ground (ao) and first excited (a....20? 0 0.50 I I I I I I I I 17.2- 18.4 MeV "Iy& pj& 0 II0.30? fiz&imfjg~ i a I I I I I I I I I 21.2-22.5 MeV 0.05? O. I 5? '0- 90 I80 0 i&4'+& i" I X I lo I I 90 I 80' .m. t,2 1,2 FIG. 9. Angular correlations for p I & decay from...

  17. Real time analysis of the RNAI-RNAII-Rop complex by surface plasmon resonance: from a decaying surface to a standard kinetic analysis.

    E-print Network

    Paris-Sud XI, Université de

    1 Real time analysis of the RNAI-RNAII-Rop complex by surface plasmon resonance: from a decaying surface to a standard kinetic analysis. Short title: Kinetic analysis of RNAI-RNAII-Rop by surface plasmon prokaryotic and eukaryotic organisms. In E. coli, RNAI, an antisense RNA encoded by the ColE1 plasmid

  18. Search for W' Boson Resonances Decaying to a Top Quark and a Bottom Quark

    Microsoft Academic Search

    Monica Pangilinan; B. Abbott; M. Abolins; B. S. Acharya; M. Adams; T. Adams; E. Aguilo; S. H. Ahn; M. Ahsan; G. D. Alexeev; Georgiy Alkhazov; A. Alton; G. Alverson; G. A. Alves; M. Anastasoaie; L. S. Ancu; T. Andeen; S. Anderson; B. Andrieu; M. S. Anzelc; M. Aoki; Y. Arnoud; M. Arov; M. Arthaud; A. Askew; B. Åsman; A. C. S. Assis Jesus; O. Atramentov; C. Avila; C. Ay; F. Badaud; A. Baden; L. Bagby; B. Baldin; D. V. Bandurin; P. Banerjee; S. Banerjee; E. Barberis; A.-F. Barfuss; P. Bargassa; P. Baringer; J. F. Bartlett; U. Bassler; D. Bauer; S. Beale; A. Bean; M. Begalli; M. Begel; C. Belanger-Champagne; L. Bellantoni; A. Bellavance; J. A. Benitez; S. B. Beri; G. Bernardi; R. Bernhard; I. Bertram; M. Besançon; R. Beuselinck; V. A. Bezzubov; P. C. Bhat; V. Bhatnagar; C. Biscarat; G. Blazey; F. Blekman; S. Blessing; D. Bloch; K. Bloom; A. Boehnlein; D. Boline; T. A. Bolton; E. E. Boos; G. Borissov; T. Bose; A. Brandt; R. Brock; G. Brooijmans; A. Bross; D. Brown; N. J. Buchanan; D. Buchholz; M. Buehler; V. Buescher; V. Bunichev; S. Burdin; S. Burke; T. H. Burnett; C. P. Buszello; J. M. Butler; P. Calfayan; S. Calvet; J. Cammin; W. Carvalho; B. C. K. Casey; H. Castilla-Valdez; S. Chakrabarti; D. Chakraborty; K. Chan; A. Chandra; F. Chevallier; E. Cheu; D. K. Cho; S. Choi; B. Choudhary; L. Christofek; T. Christoudias; S. Cihangir; D. Claes; Y. Coadou; M. Corcoran; W. E. Cooper; M.-C. Cousinou; F. Couderc; S. Crépé-Renaudin; D. Cutts; M. Cwiok; H. da Motta; A. Das; G. Davies; K. de; S. J. de Jong; E. de La Cruz-Burelo; C. de Oliveira Martins; J. D. Degenhardt; F. Déliot; M. Demarteau; R. Demina; D. Denisov; S. P. Denisov; S. Desai; H. T. Diehl; M. Diesburg; A. Dominguez; H. Dong; L. V. Dudko; L. Duflot; S. R. Dugad; D. Duggan; A. Duperrin; J. Dyer; A. Dyshkant; M. Eads; D. Edmunds; J. Ellison; V. D. Elvira; Y. Enari; S. Eno; P. Ermolov; H. Evans; A. Evdokimov; V. N. Evdokimov; A. V. Ferapontov; T. Ferbel; F. Fiedler; F. Filthaut; W. Fisher; H. E. Fisk; M. Fortner; H. Fox; S. Fu; S. Fuess; T. Gadfort; C. F. Galea; E. Gallas; C. Garcia; A. Garcia-Bellido; V. Gavrilov; P. D. Grannis; W. Geist; D. Gelé; C. E. Gerber; Y. Gershtein; D. Gillberg; G. Ginther; N. Gollub; B. Gómez; A. Goussiou; H. Greenlee; Z. D. Greenwood; E. M. Gregores; G. Grenier; Ph. Gris; J.-F. Grivaz; A. Grohsjean; S. Grünendahl; M. W. Grünewald; F. Guo; J. Guo; G. Gutierrez; P. Gutierrez; A. Haas; N. J. Hadley; P. Haefner; S. Hagopian; J. Haley; I. Hall; R. E. Hall; L. Han; K. Harder; A. Harel; R. Harrington; J. M. Hauptman; R. Hauser; J. Hays; T. Hebbeker; D. Hedin; J. G. Hegeman; J. M. Heinmiller; A. P. Heinson; U. Heintz; C. Hensel; K. Herner; G. Hesketh; M. D. Hildreth; R. Hirosky; J. D. Hobbs; B. Hoeneisen; H. Hoeth; M. Hohlfeld; S. J. Hong; S. Hossain; P. Houben; Y. Hu; Z. Hubacek; V. Hynek; I. Iashvili; R. Illingworth; A. S. Ito; S. Jabeen; M. Jaffré; S. Jain; K. Jakobs; C. Jarvis; R. Jesik; K. Johns; C. Johnson; M. Johnson; A. Jonckheere; P. Jonsson; A. Juste; E. Kajfasz; A. M. Kalinin; J. M. Kalk; S. Kappler; D. Karmanov; P. A. Kasper; I. Katsanos; D. Kau; V. Kaushik; R. Kehoe; S. Kermiche; N. Khalatyan; A. Khanov; A. Kharchilava; Y. M. Kharzheev; D. Khatidze; T. J. Kim; M. H. Kirby; M. Kirsch; B. Klima; J. M. Kohli; J.-P. Konrath; V. M. Korablev; A. V. Kozelov; J. Kraus; D. Krop; T. Kuhl; A. Kumar; A. Kupco; T. Kurca; J. Kvita; F. Lacroix; D. Lam; S. Lammers; G. Landsberg; P. Lebrun; W. M. Lee; A. Leflat; J. Lellouch; J. Leveque; J. Li; L. Li; Q. Z. Li; S. M. Lietti; J. G. R. Lima; D. Lincoln; J. Linnemann; V. V. Lipaev; R. Lipton; Y. Liu; Z. Liu; A. Lobodenko; M. Lokajicek; P. Love; H. J. Lubatti; R. Luna; A. L. Lyon; A. K. A. Maciel; D. Mackin; R. J. Madaras; P. Mättig; C. Magass; A. Magerkurth; P. K. Mal; H. B. Malbouisson; S. Malik; V. L. Malyshev; H. S. Mao; Y. Maravin; B. Martin; R. McCarthy; A. Melnitchouk; L. Mendoza; P. G. Mercadante; M. Merkin; K. W. Merritt; A. Meyer; J. Meyer; T. Millet; J. Mitrevski; J. Molina; R. K. Mommsen; N. K. Mondal; R. W. Moore; T. Moulik; G. S. Muanza; M. Mulders; M. Mulhearn; O. Mundal; L. Mundim; E. Nagy; M. Naimuddin; M. Narain; N. A. Naumann; H. A. Neal; J. P. Negret; P. Neustroev; H. Nilsen; H. Nogima; S. F. Novaes; T. Nunnemann; V. O'Dell; D. C. O'Neil; G. Obrant; C. Ochando; D. Onoprienko; N. Oshima; N. Osman; J. Osta; R. Otec; G. J. Otero Y Garzón; M. Owen; P. Padley; N. Parashar; S.-J. Park; S. K. Park; J. Parsons; R. Partridge; N. Parua; A. Patwa; G. Pawloski; B. Penning; M. Perfilov; K. Peters; Y. Peters; P. Pétroff; M. Petteni; R. Piegaia; J. Piper; M.-A. Pleier; P. L. M. Podesta-Lerma; V. M. Podstavkov; Y. Pogorelov; M.-E. Pol; P. Polozov; B. G. Pope; A. V. Popov; C. Potter; W. L. Prado da Silva; H. B. Prosper; S. Protopopescu; J. Qian; A. Quadt; B. Quinn; A. Rakitine; M. S. Rangel; K. Ranjan; P. N. Ratoff; P. Renkel; S. Reucroft; P. Rich; J. Rieger

    2008-01-01

    We search for the production of a heavy W' gauge boson that decays to third generation quarks in 0.9fb-1 of p pmacr collisions at s=1.96TeV, collected with the D0 detector at the Fermilab Tevatron collider. We find no significant excess in the final-state invariant mass distribution and set upper limits on the production cross section times branching fraction. For a

  19. Decay properties of tau leptons measured at the Z0 resonance

    Microsoft Academic Search

    B. Adeva; O. Adriani; M. Aguilar-Benitez; H. Akbari; J. Alcaraz; A. Aloisio; G. Alverson; M. G. Alviggi; G. Ambrosi; Q. An; H. Anderhub; A. L. Anderson; V. P. Andreev; T. Angelov; L. Antonov; D. Antreasyan; P. Arce; A. Arefiev; T. Azemoon; P. V. K. S. Baba; P. Bagnaia; J. A. Bakken; L. Baksay; R. C. Ball; S. Banerjee; J. Bao; R. Barillère; L. Barone; R. Battiston; A. Bay; U. Becker; F. Behner; J. Behrens; S. Beingessner; Gy. L. Bencze; J. Berdugo; P. Berges; B. Bertucci; A. Biland; G. M. Bilei; R. Bizzarri; J. J. Blaising; P. Blömeke; B. Blumenfeld; G. J. Bobbink; M. Bocciolini; R. Bock; A. Böhm; B. Borgia; D. Bourilkov; M. Bourquin; D. Boutigny; B. Bouwens; J. G. Branson; I. C. Brock; F. Bruyant; C. Buisson; A. Bujak; J. D. Burger; J. Busenitz; X. D. Cai; M. Capell; F. Carbonara; M. Caria; F. Carminati; A. M. Cartacci; M. Cerrada; Y. H. Chang; U. K. Chaturvedi; M. Chemarin; A. Chen; C. Chen; G. M. Chen; H. F. Chen; H. S. Chen; M. Chen; W. Y. Chen; G. Chiefari; C. Y. Chien; M. Chmeissani; C. Civinini; I. Clare; R. Clare; H. O. Cohn; G. Coignet; N. Colino; V. Commichau; G. Conforto; A. Contin; F. Crijns; X. Y. Cui; T. S. Dai; R. D'Alessandro; R. de Asmundis; A. Degré; K. Dénes; P. Denes; F. Denotaristefani; M. Dhina; D. Dibitonto; M. Diemoz; H. R. Dimitrov; C. Dionisi; E. Drago; T. Driever; D. Duchesneau; P. Duinker; I. Duran; H. El Mamouni; A. Engler; F. J. Eppling; F. C. Erné; P. Extermann; R. Fabbretti; M. Fabre; S. Falciano; Q. Fan; S. J. Fan; O. Fackler; J. Fay; T. Ferguson; G. Fernandez; F. Ferroni; H. Fesefeldt; E. Fiandrini; J. Field; F. Filthaut; G. Finocchiaro; P. H. Fisher; G. Forconi; T. Foreman; K. Freudenreich; W. Friebel; M. Fukushima; M. Gailloud; Yu. Galaktionov; E. Gallo; S. N. Ganguli; P. Garcia-Abia; S. S. Gau; D. Gele; S. Gentile; M. Glaubman; S. Goldfarb; Z. F. Gong; E. Gonzalez; A. Gordeev; P. Göttlicher; D. Goujon; G. Gratta; C. Grinnell; M. Gruenewald; M. Guanziroli; J. K. Guo; A. Gurtu; H. R. Gustafson; L. J. Gutay; H. Haan; A. Hasan; D. Hauschildt; C. F. He; T. Hebbeker; M. Hebert; G. Herten; U. Herten; A. Hervé; K. Hilgers; H. Hofer; H. Hoorani; L. S. Hsu; G. Hu; B. Ille; M. M. Ilyas; V. Innocente; H. Janssen; S. Jezequel; B. N. Jin; L. W. Jones; A. Kasser; R. A. Khan; Yu. Kamyshkov; Y. Karyotakis; M. Kaur; S. Khokhar; V. Khoze; M. N. Kienzle-Focacci; W. Kinnison; D. Kirkby; W. Kittel; A. Klimentov; A. C. König; O. Kornadt; V. Koutsenko; R. W. Kraemer; T. Kramer; V. R. Krastev; W. Krenz; J. Krizmanic; K. S. Kumar; A. Kunin; V. Lalieu; G. Landi; K. Lanius; D. Lanske; S. Lanzano; P. Lebrun; P. Lecomte; P. Lecoq; P. Le Coultre; D. Lee; I. Leedom; J. M. Le Goff; L. Leistam; R. Leiste; M. Lenti; E. Leonardi; J. Lettry; P. M. Levchenko; X. Leytens; C. Li; H. T. Li; J. F. Li; L. Li; P. J. Li; Q. Li; X. G. Li; J. Y. Liao; Z. Y. Lin; F. L. Linde; B. Lindemann; D. Linnhofer; R. Liu; Y. Liu; W. Lohmann; E. Longo; Y. S. Lu; J. M. Lubbers; K. Lübelsmeyer; C. Luci; D. Luckey; L. Ludovici; L. Luminari; W. G. Ma; M. MacDermott; R. Magahiz; P. K. Malhotra; R. Malik; A. Malinin; C. Maña; D. N. Mao; Y. F. Mao; M. Maolinbay; P. Marchesini; A. Marchionni; J. P. Martin; L. Martinez-Laso; F. Marzano; G. G. G. Massaro; T. Matsuda; K. Mazumdar; P. McBride; T. McMahon; D. McNally; Th. Meinholz; M. Merk; L. Merola; M. Meschini; W. J. Metzger; Y. Mi; G. B. Mills; Y. Mir; G. Mirabelli; J. Mnich; M. Möller; B. Monteleoni; G. Morand; R. Morand; S. Morganti; N. E. Moulai; R. Mount; S. Müller; E. Nagy; M. Napolitano; H. Newman; C. Neyer; M. A. Niaz; L. Niessen; H. Nowak; D. Pandoulas; M. Pauluzzi; F. Pauss; F. Plasil; G. Passaleva; G. Paternoster; S. Patricelli; Y. J. Pei; D. Perret-Gallix; J. Perrier; A. Pevsner; M. Pieri; P. A. Piroué; V. Plyaskin; M. Pohl; V. Pojidaev; N. Produit; J. M. Qian; K. N. Qureshi; R. Raghavan; G. Rahal-Callot; G. Raven; P. Razis; K. Read; D. Ren; Z. Ren; S. Reucroft; A. Ricker; S. Riemann; O. Rind; C. Rippich; H. A. Rizvi; B. P. Roe; M. Röhner; S. Röhner; L. Romero; J. Rose; S. Rosier-Lees; R. Rosmalen; Ph. Rosselet; A. Rubbia; J. A. Rubio; W. Ruckstuhl; H. Rykaczewski; M. Sachwitz; J. Salicio; G. Sanders; A. Santocchia; M. S. Sarakinos; G. Sartorelli; G. Sauvage; A. Savin; V. Schegelsky; K. Schmiemann; D. Schmitz; P. Schmitz; M. Schneegans; H. Schopper; D. J. Schotanus; S. Shotkin; H. J. Schreiber; R. Schulte; S. Schulte; K. Schultze; J. Schütte; J. Schwenke; G. Schwering; C. Sciacca; I. Scott; R. Sehgal; P. G. Seiler; L. Servoli; I. Sheer; D. Z. Shen; V. Shevchenko; S. Shevchenko; X. R. Shi; K. Shmakov; V. Shoutko; E. Shumilov; N. Smirnov; E. Soderstrom; A. Sopczak; C. Spartiotis; T. Spickermann; P. Spillantini; R. Starosta; M. Steuer; D. P. Stickland; F. Sticozzi; W. Stoeffl; H. Stone; K. Strauch; B. C. Stringfellow; K. Sudhakar; G. Sultanov; R. L. Summer; L. Z. Sun; H. Suter; R. B. Sutton; J. D. Swain; A. A. Syed; X. W. Tang; E. Tarkovsky

    1991-01-01

    From 2540 Z0 --> tau+tau- events, we determine the inclusive decay branching fractions of the tau-lepton into one and three charged particles to be 0.856 +\\/- 0.006 (stat.) +\\/- 0.003 (syst.) and 0.144 +\\/- 0.006 (stat.) +\\/- 0.003 (syst.), respectively. The leptonic branching fractions are measured to be 0.175 +\\/- 0.008 (stat.) +\\/- 0.005 (syst.) for tau --> munumunutau and

  20. A precise measurement of the Z resonance parameters through its hadronic decays

    Microsoft Academic Search

    P. Abreu; W. Adam; F. Adami; T. Adye; G. D. Alekseev; James V Allaby; P. Allen; S. Almehed; F. Alted; S. J. Alvsvaag; Ugo Amaldi; E G Anassontzis; W. D. Apel; B. Asman; C. Astor Ferreres; J. E. Augustin; A. Augustinus; Paul Baillon; P. Bambade; F. Barao; Guido Barbiellini; Dimitri Yuri Bardin; A. Baroncelli; O. Barring; Walter Bartl; M. J. Bates; M. Baubillier; K. H. Becks; C. J. Beeston; P. Beilliere; I. Belokopytov; P. Beltran; D. Benedic; J. M. Benlloch; M. Berggren; D. Bertrand; S F Biagi; F. Bianchi; J. H. Bibby; M. S. Bilenky; P. Billoir; J. Bjarne; D. Bloch; P. N. Bogolubov; D. Bollini; T. Bolognese; M. Bonapart; P. S. L. Booth; M. Boratav; P. Borgeaud; H. Borner; G. Borisov; C. Bosio; O. Botner; B. Bouquet; M. Bozzo; S. Braibant; P. Branchini; K. D. Brand; R. A. Brenner; C. Bricman; R. C. A. Brown; N. Brummer; J. M. Brunet; L. Bugge; T. Buran; H. Burmeister; C. M. Buttar; J. A. M. A. Buytaert; M. Caccia; M. Calvi; A. J. Camacho Rozas; J. E. Campagne; A. Campion; T. Camporesi; V. Canale; F. Cao; L. Carroll; Carlo Caso; Edoardo Castelli; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; L. Cerrito; P. Charpentier; P. Checchia; G. A. Chelkov; L. Chevalier; C. Chiccoli; P. V. Chliapnikov; V. Chorowicz; R. Cirio; M. P. Clara; J. L. Contreras; R. Contri; G. Cosme; F. Couchot; H. B. Crawley; D J Crennell; M. Cresti; G. Crosetti; N. Crosland; M. Crozon; J. Cuevas Maestro; S. Czellar; S. Dagoret; Erik Dahl-Jensen; B. D'Almagne; M. Dam; G. Damgaard; G. Darbo; Evelyne Daubie; Martyn Davenport; P. David; A. de Angelis; M. de Beer; H. de Boeck; Wim de Boer; C. de Clercq; M. D. M. de Fez Laso; N. de Groot; B. de Lotto; C. de La Vaissiere; C. Defoix; D. Delikaris; P A Delpierre; N. Demaria; K. G. Denisenko; Lucia Di Ciaccio; Albert Nomdo Diddens; H. Dijkstra; F. Djama; J. Dolbeau; K. Doroba; M. Dracos; J. Drees; M. Dris; W. Dulinski; R I Dzhelyadin; D. N. Edwards; L. O. Eek; Paule Anna Mari Eerola; T J C Ekelöf; Gösta Ekspong; J. P. Engel; V P Falaleev; A. Fenyuk; M. Fernandez Alonso; A. Ferrer; S. Ferroni; T. A. Filippas; A. Firestone; H. Foeth; E. Fokitis; F. Fontanelli; H. Forsbach; B J Franek; K. E. Fransson; P. Frenkiel; D E C Fries; R. Fruhwirth; F. Fulda-Quenzer; H. Fuerstenau; J A Fuster; J. M. Gago; G. Galeazzi; D. Gamba; U. Gasparini; P. Gavillet; S. Gawne; E. N. Gazis; P. Giacomelli; K. W. Glitza; R. Gokieli; V. M. Golovatyuk; A. Goobar; Gian P Gopal; M. Gorski; V. Graco; A. Grant; F. Grard; E. Graziani; M. H. Gros; G. Grosdidier; B. Grossetete; S A Gumenyuk; J. Guy; F. Hahn; M. Hahn; S. Haider; Z. Hajduk; A. Hakansson; A. Hallgren; K. Hamacher; G. Hamel de Monchenault; J. F. Harris; B. Heck; I. Herbst; J. J. Hernandez; P. Herquet; H. Herr; E. Higon; Hans Jürgen Hilke; T. Hofmokl; R. Holmes; S. O. Holmgren; J. E. Hooper; M A Houlden; Josef Hrubec; P. O. Hulth; K. Hultqvist; D. Husson; Bernard David Hyams; P. Ioannou; P. S. Iversen; J. N. Jackson; P. Jalocha; G. Jarlskog; P. Jarry; B. Jean-Marie; E. K. Johansson; M. Jonker; L B Jönsson; P. Juillot; R. B. Kadyrov; G. Kalkanis; George Ernest Kalmus; G. Kantardjian; F. Kapusta; P. Kapusta; S. Katsanevas; E. C. Katsoufis; R. Keranen; J. Kesteman; B. A. Khomenko; B J King; H. Klein; W. Klempt; A. Klovning; P M Kluit; J. H. Koehne; B. Koene; P. Kokkinias; M. Kopf; M. Koratzinos; K. Korcyl; B. Korzen; C. Kourkoumelis; T. Kreuzberger; J. Krolikowski; U. Kruener-Marquis; W. Krupinski; W. Kucewicz; K L Kurvinen; Mikko Laakso; C. Lambropoulos; J. W. Lamsa; L. Lanceri; D. Langerveld; V. Lapin; J. P. Laugier; R. Lauhakangas; P. Laurikainen; Gerhard Leder; F. Ledroit; J. Lemonne; Georg Lenzen; V. Lepeltier; A A Letessier-Selvon; E H Lieb; E. Lillestol; E. Lillethun; J. Lindgren; I. Lippi; R. Llosa; B. Loerstad; M. Lokajicek; J. G. Loken; A. Lopez; M. A. Lopez Aguera; D. Loukas; J Lozano-Bahilo; R. Lucock; B. Lund-Jensen; P. Lutz; L. Lyons; G. Maehlum; J. Maillard; A. Maltezos; F. Mandl; J. Marco; J. C. Marin; A. Markou; L G Mathis; C. Matteuzzi; Giorgio Matthiae; M. Mazzucato; M. Mc Cubbin; R. Mc Kay; E. Menichetti; C. Meroni; W. T. Meyer; W. A. Mitaroff; G. V. Mitselmakher; U. Mjoernmark; T. Moa; R. Moeller; K. Moenig; M. R. Monge; P. Morettini; H. Mueller; H. Muller; G. Myatt; F. Naraghi; U. Nau-Korzen; F. L. Navarria; P. Negri; B. S. Nielsen; M. Nigro; V. Nikolaenko; V. Obraztsov; R. Orava; A. Ostankov; A. Ouraou; R. Pain; K. Pakonski; H. Palka; T. Papadopoulou; L. Pape; P. Pasini; A. Passeri; M. Pegoraro; V. Perevozchikov; M. Pernicka; M. Pimenta; O. Pingot; C. Pinori; A. Pinsent; M. E. Pol; G. Polok; P Privitera; A. Pullia; J. Pyyhtia; P. Queru; A. A. Rademakers; D. Radojicic; S. Ragazzi; W. H. Range; P. N. Ratoff; A. L. Read; N. G. Redaelli; M. Regler; D. Reid; P. B. Renton; L. K. Resvanis; F. Richard; J. Ridky; G. Rinaudo; I. Roditi; A. Romero; P. Ronchese; E. Rosenberg; E. Rosso

    1990-01-01

    A measurement of the cross section for e+e- --> hadrons using 11 000 hadronic decays of the Z boson at ten different center-of-mass energies is presented. A three-parameter fit gives the following values for the Z mass Mz, the total width Gammaz, the product of the electronic and hadronic partial widths GammaeGammah, and the unfolded pole cross section sigma0: MZ=91.171+\\/-0.030(stat)+\\/-0.030

  1. Tetraquark resonances with the triple flip-flop potential, decays in the cherry in a broken glass approximation

    E-print Network

    Pedro Bicudo; Marco Cardoso

    2010-10-02

    We develop a unitarized formalism to study tetraquarks using the triple flip-flop potential, which includes two meson-meson potentials and the tetraquark four-body potential. This can be related to the Jaffe-Wilczek and to the Karliner-Lipkin tetraquark models, where we also consider the possible open channels, since the four quarks and antiquarks may at any time escape to a pair of mesons. Here we study a simplified two-variable toy model and explore the analogy with a cherry in a glass, but a broken one where the cherry may escape from. It is quite interesting to have our system confined or compact in one variable and infinite in the other variable. In this framework we solve the two-variable Schr\\"odinger equation in configuration space. With the finite difference method, we compute the spectrum, we search for localized states and we attempt to compute phase shifts. We then apply the outgoing spherical wave method to compute in detail the phase shifts and and to determine the decay widths. We explore the model in the equal mass case, and we find narrow resonances. In particular the existence of two commuting angular momenta is responsible for our small decay widths.

  2. Decays of tetraquark resonances in a two-variable approximation to the triple flip-flop potential

    NASA Astrophysics Data System (ADS)

    Bicudo, P.; Cardoso, M.

    2011-05-01

    We develop a unitarized formalism to study tetraquarks using the triple flip-flop potential, which includes two meson-meson potentials and the tetraquark four-body potential. This can be related to the Jaffe-Wilczek and to the Karliner-Lipkin tetraquark models, where we also consider the possible open channels, since the four quarks and antiquarks may at any time escape to a pair of mesons. Here we study a simplified two-variable toy model and explore the analogy with a cherry in a glass, but a broken one where the cherry may escape from. It is quite interesting to have our system confined or compact in one variable and infinite in the other variable. In this framework we solve the two-variable Schrödinger equation in configuration space. With the finite difference method, we compute the spectrum, we search for localized states and we attempt to compute phase-shifts. We then apply the outgoing spherical wave method to compute in detail the phase-shifts and to determine the decay widths. We explore the model in the equal mass case, and we find narrow resonances. In particular the existence of two commuting angular momenta is responsible for our small decay widths.

  3. Decays of tetraquark resonances in a two-variable approximation to the triple flip-flop potential

    SciTech Connect

    Bicudo, P.; Cardoso, M. [Dep. Fisica and CFTP, Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisboa (Portugal)

    2011-05-01

    We develop a unitarized formalism to study tetraquarks using the triple flip-flop potential, which includes two meson-meson potentials and the tetraquark four-body potential. This can be related to the Jaffe-Wilczek and to the Karliner-Lipkin tetraquark models, where we also consider the possible open channels, since the four quarks and antiquarks may at any time escape to a pair of mesons. Here we study a simplified two-variable toy model and explore the analogy with a cherry in a glass, but a broken one where the cherry may escape from. It is quite interesting to have our system confined or compact in one variable and infinite in the other variable. In this framework we solve the two-variable Schroedinger equation in configuration space. With the finite difference method, we compute the spectrum, we search for localized states and we attempt to compute phase-shifts. We then apply the outgoing spherical wave method to compute in detail the phase-shifts and to determine the decay widths. We explore the model in the equal mass case, and we find narrow resonances. In particular the existence of two commuting angular momenta is responsible for our small decay widths.

  4. Search for B{sub s}{sup 0{yields}}hh decays at the {Upsilon}(5S) resonance

    SciTech Connect

    Peng, C.-C.; Chang, P.; Chao, Y.; Chen, K.-F.; Chen, P.; Chiang, C.-C.; Hou, W.-S.; Shiu, J.-G. [Department of Physics, National Taiwan University, Taipei (China); Adachi, I.; Haba, J.; Itoh, R.; Iwasaki, Y.; Krokovny, P.; Nakao, M.; Nishida, S.; Sakai, Y.; Sumisawa, K.; Tanaka, M.; Trabelsi, K.; Uehara, S. [High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

    2010-10-01

    We have searched for B{sub s}{sup 0{yields}}hh decays, where h stands for a charged or neutral kaon, or a charged pion. These results are based on a 23.6 fb{sup -1} data sample collected with the Belle detector on the {Upsilon}(5S) resonance at the KEKB asymmetric-energy e{sup +}e{sup -} collider, containing 1.25x10{sup 6} B{sub s}{sup (*)}B{sub s}{sup (*)} events. We observe the decay B{sub s}{sup 0{yields}}K{sup +}K{sup -} and measure its branching fraction, B(B{sub s}{sup 0{yields}}K{sup +}K{sup -})=[3.8{sub -0.9}{sup +1.0}(stat){+-}0.5(syst){+-}0.5(f{sub s})]x10{sup -5}. The first error is statistical, the second is systematic, and the third error is due to the uncertainty in the B{sub s}{sup 0} production fraction in e{sup +}e{sup -{yields}}bb events. No significant signals are seen in other decay modes, and we set upper limits at the 90% confidence level: B(B{sub s}{sup 0{yields}}K{sup -{pi}+})<1.2x10{sup -5}, B(B{sub s}{sup 0{yields}{pi}+{pi}-})<2.6x10{sup -5}, and B(B{sub s}{sup 0{yields}}K{sup 0}K{sup 0})<6.6x10{sup -5}.

  5. Improved L-C resonant decay technique for Q measurement of quasilinear power inductors: New results for MPP and ferrite powdered cores

    NASA Technical Reports Server (NTRS)

    Niedra, Janis M.; Gerber, Scott S.

    1995-01-01

    The L-C resonant decay technique for measuring circuit Q or losses is improved by eliminating the switch from the inductor-capacitor loop. A MOSFET switch is used instead to momentarily connect the resonant circuit to an existing voltage source, which itself is gated off during the decay transient. Very reproducible, low duty cycle data could be taken this way over a dynamic voltage range of at least 10:1. Circuit Q is computed from a polynomial fit to the sequence of the decaying voltage maxima. This method was applied to measure the losses at 60 kHz in inductors having loose powder cores of moly permalloy and an Mn-Zn power ferrite. After the copper and capacitor losses are separated out, the resulting specific core loss is shown to be roughly as expected for the MPP powder, but anomalously high for the ferrite powder. Possible causes are mentioned.

  6. On the partial-wave analysis of mesonic resonances decaying to multiparticle final states produced by polarized photons

    NASA Astrophysics Data System (ADS)

    Salgado, Carlos W.; Weygand, Dennis P.

    2014-04-01

    Meson spectroscopy is going through a revival with the advent of high statistics experiments and new advances in the theoretical predictions. The Constituent Quark Model (CQM) is finally being expanded considering more basic principles of field theory and using discrete calculations of Quantum Chromodynamics (lattice QCD). These new calculations are approaching predictive power for the spectrum of hadronic resonances and decay modes. It will be the task of the new experiments to extract the meson spectrum from the data and compare with those predictions. The goal of this report is to describe one particular technique for extracting resonance information from multiparticle final states. The technique described here, partial wave analysis based on the helicity formalism, has been used at Brookhaven National Laboratory (BNL) using pion beams, and Jefferson Laboratory (JLab) using photon beams. In particular this report broadens this technique to include production experiments using linearly polarized real photons or quasi-real photons. This article is of a didactical nature. We describe the process of analysis, detailing assumptions and formalisms, and is directed towards people interested in starting partial wave analysis.

  7. On the Partial-Wave Analysis of Mesonic Resonances Decaying to Multiparticle Final States Produced by Polarized Photons

    SciTech Connect

    Salgado, Carlos W. [Norfolk State University, Norfolk, VA (United States) and Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Weygand, Dennis P. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

    2014-04-01

    Meson spectroscopy is going through a revival with the advent of high statistics experiments and new advances in the theoretical predictions. The Constituent Quark Model (CQM) is finally being expanded considering more basic principles of field theory and using discrete calculations of Quantum Chromodynamics (lattice QCD). These new calculations are approaching predictive power for the spectrum of hadronic resonances and decay modes. It will be the task of the new experiments to extract the meson spectrum from the data and compare with those predictions. The goal of this report is to describe one particular technique for extracting resonance information from multiparticle final states. The technique described here, partial wave analysis based on the helicity formalism, has been used at Brookhaven National Laboratory (BNL) using pion beams, and Jefferson Laboratory (Jlab) using photon beams. In particular this report broaden this technique to include production experiments using linearly polarized real photons or quasi-real photons. This article is of a didactical nature. We describe the process of analysis, detailing assumptions and formalisms, and is directed towards people interested in starting partial wave analysis.

  8. Search for resonant production of tt decaying to jets in pp collisions at {radical}(s)=1.96 TeV

    SciTech Connect

    Aaltonen, T.; Brucken, E.; Devoto, F.; Mehtala, P.; Orava, R. [Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland); Alvarez Gonzalez, B.; Casal, B.; Cuevas, J.; Gomez, G.; Palencia, E.; Rodrigo, T.; Ruiz, A.; Scodellaro, L.; Vila, I.; Vilar, R.; Vizan, J. [Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander (Spain); Amerio, S.; Dorigo, T.; Totaro, P. [Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova (Italy); Amidei, D. [University of Michigan, Ann Arbor, Michigan 48109 (United States)

    2011-10-01

    This paper reports a search for nonstandard model topquark resonances, Z', decaying to tt{yields}W{sup +}bW{sup -}b, where both W decay to quarks. We examine the top-antitop quark invariant mass spectrum for the presence of narrow resonant states. The search uses a data sample of pp collisions at a center of mass energy of 1.96 TeV collected by the CDF II detector at the Fermilab Tevatron, with an integrated luminosity of 2.8 fb{sup -1}. No evidence for top-antitop quark resonant production is found. We place upper limits on the production cross section times branching ratio for a specific topcolor assisted technicolor model in which the Z' has a width of {Gamma}{sub Z'}=0.012M{sub Z'}. Within this model, we exclude a Z' boson with masses below 805 GeV/c{sup 2} at the 95% confidence level.

  9. Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at = 8 TeV

    NASA Astrophysics Data System (ADS)

    Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Gonzalez, J. Suarez; Alderweireldt, S.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Knutsson, A.; Luyckx, S.; Ochesanu, S.; Roland, B.; Rougny, R.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D'Hondt, J.; Daci, N.; Heracleous, N.; Kalogeropoulos, A.; Keaveney, J.; Kim, T. J.; Lowette, S.; Maes, M.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Dobur, D.; Favart, L.; Gay, A. P. R.; Grebenyuk, A.; Léonard, A.; Mohammadi, A.; Perniè, L.; Reis, T.; Seva, T.; Thomas, L.; Velde, C. Vander; Vanlaer, P.; Wang, J.; Adler, V.; Beernaert, K.; Benucci, L.; Cimmino, A.; Costantini, S.; Crucy, S.; Dildick, S.; Fagot, A.; Garcia, G.; Klein, B.; Mccartin, J.; Rios, A. A. Ocampo; Ryckbosch, D.; Diblen, S. Salva; Sigamani, M.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Beluffi, C.; Bruno, G.; Castello, R.; Caudron, A.; Ceard, L.; Da Silveira, G. G.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Jez, P.; Komm, M.; Lemaitre, V.; Liao, J.; Nuttens, C.; Pagano, D.; Pin, A.; Piotrzkowski, K.; Popov, A.; Quertenmont, L.; Selvaggi, M.; Marono, M. Vidal; Garcia, J. M. Vizan; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Martins, M. Correa; Martins, T. Dos Reis; Pol, M. E.; Aldá, W. L.; Carvalho, W.; Chinellato, J.; Custódio, A.; Da Costa, E. M.; De Jesus Damiao, D.; De Oliveira Martins, C.; De Souza, S. Fonseca; Malbouisson, H.; Malek, M.; Figueiredo, D. Matos; Mundim, L.; Nogima, H.; Da Silva, W. L. Prado; Santaolalla, J.; Santoro, A.; Sznajder, A.; Manganote, E. J. Tonelli; Pereira, A. Vilela; Bernardes, C. A.; Dias, F. A.; Tomei, T. R. Fernandez Perez; Gregores, E. M.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Aleksandrov, A.; Genchev, V.; Iaydjiev, P.; Marinov, A.; Piperov, S.; Rodozov, M.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Glushkov, I.; Hadjiiska, R.; Kozhuharov, V.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Chen, M.; Du, R.; Jiang, C. H.; Liang, D.; Liang, S.; Plestina, R.; Tao, J.; Wang, X.; Wang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Guo, Y.; Li, Q.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Wang, D.; Zhang, L.; Zou, W.; Avila, C.; Sierra, L. F. Chaparro; Florez, C.; Gomez, J. P.; Moreno, B. Gomez; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Kadija, K.; Luetic, J.; Mekterovic, D.; Sudic, L.; Attikis, A.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Bodlak, M.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Murumaa, M.; Raidal, M.; Tiko, A.; Eerola, P.; Fedi, G.; Voutilainen, M.; Härkönen, J.; Karimäki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Wendland, L.; Tuuva, T.; Besancon, M.; Couderc, F.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Favaro, C.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; de Monchenault, G. Hamel; Jarry, P.; Locci, E.; Malcles, J.; Nayak, A.; Rander, J.; Rosowsky, A.; Titov, M.; Baffioni, S.; Beaudette, F.; Busson, P.; Charlot, C.; Dahms, T.; Dalchenko, M.; Dobrzynski, L.; Filipovic, N.; Florent, A.; de Cassagnac, R. Granier; Mastrolorenzo, L.; Miné, P.; Mironov, C.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Paganini, P.; Salerno, R.; Sauvan, J. B.; Sirois, Y.; Veelken, C.; Yilmaz, Y.; Zabi, A.; Agram, J.-L.; Andrea, J.; Aubin, A.; Bloch, D.; Brom, J.-M.; Chabert, E. C.; Collard, C.; Conte, E.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Goetzmann, C.; Le Bihan, A.-C.; Van Hove, P.; Gadrat, S.; Beauceron, S.; Beaupere, N.; Boudoul, G.; Brochet, S.; Montoya, C. A. Carrillo; De Oliveira, A. Carvalho Antunes; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fan, J.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Alvarez, J. D. Ruiz; Sabes, D.; Sgandurra, L.; Sordini, V.; Donckt, M. Vander; Verdier, P.; Viret, S.; Xiao, H.

    2014-08-01

    A search is reported for massive resonances decaying into a quark and a vector boson (W or Z), or two vector bosons (WW, WZ, or ZZ). The analysis is performed on an inclusive sample of multijet events corresponding to an integrated luminosity of 19.7 fb-1, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. The search uses novel jet-substructure identification techniques that provide sensitivity to the presence of highly boosted vector bosons decaying into a pair of quarks. Exclusion limits are set at a confidence level of 95% on the production of: (i) excited quark resonances q*decaying to qW and qZ for masses less than 3.2 TeV and 2.9 TeV, respectively, (ii) a Randall-Sundrum graviton GRS decaying into WW for masses below 1.2 TeV, and (iii) a heavy partner of the W boson W' decaying into WZ for masses less than 1.7 TeV. For the first time mass limits are set on W' ? WZ and GRS ? WW in the all-jets final state. The mass limits on q* ? qW, q* ? qZ, W' ? WZ, GRS ? WW are the most stringent to date. A model with a "bulk" graviton Gbulk that decays into WW or ZZ bosons is also studied. [Figure not available: see fulltext.

  10. $B^0$ and $B^0_s$ decays into $J/?$ $f_0(980)$ and $J/?$ $f_0(500)$ and the nature of the scalar resonances

    E-print Network

    W. H. Liang; E. Oset

    2014-08-26

    We describe the $B^0$ and $B^0_s$ decays into $J/\\psi$ $f_0(500)$ and $J/\\psi$ $f_0(980)$ by taking into account the dominant process for the weak decay of $B^0$ and $B^0_s$ into $J/\\psi$ and a $q \\bar q$ component. After hadronization of this $q \\bar q$ component into pairs of pseudoscalar mesons we obtain certain weights for the meson-meson components and allow them to interact among themselves. The final state interaction of the meson-meson components, described in terms of chiral unitary theory, gives rise to the $f_0(980)$ and $f_0(500)$ resonances and we can obtain the $\\pi^+ \\pi^- $ invariant mass distributions after the decay of the resonances, which allows us to compare directly to the experiments. We obtain ratios of $J/\\psi$ $f_0(980)$ and $J/\\psi$ $f_0(500)$ for each of the $B$ decays in quantitative agreement with experiment, with the $f_0(980)$ clearly dominant in the $B^0_s$ decay and the $f_0(500)$ in the $B^0$ decay.

  11. Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at ?s = 8 TeV

    SciTech Connect

    Khachatryan, Vardan [Yerevan Phys. Inst. (Armenia)

    2014-08-01

    Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at ?s = 8 TeV05/08/2014A search is reported for massive resonances decaying into a quark and a vector boson (W or Z), or two vector bosons (WW, WZ, or ZZ). The analysis is performed on an inclusive sample of multijet events corresponding to an integrated luminosity of 19.7 inverse femtobarns, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. The search uses novel jet-substructure identification techniques that provide sensitivity to the presence of highly boosted vector bosons decaying into a pair of quarks. Exclusion limits are set at a confidence level of 95% on the production of: (i) excited quark resonances q* decaying to qW and qZ for masses less than 3.2 TeV and 2.9 TeV, respectively, (ii) a Randall-Sundrum graviton G[RS] decaying into WW for masses below 1.2 TeV, and (iii) a heavy partner of the W boson W' decaying into WZ for masses less than 1.7 TeV. For the first time mass limits are set on W' to WZ and G[RS] to WW in the all-jets final state. The mass limits on q* to qW, q* to qZ, W' to WZ, G[RS] to WW are the most stringent to date. A model with a "bulk" graviton G[Bulk] that decays into WW or ZZ bosons is also studied.

  12. Resonance

    NSDL National Science Digital Library

    Kuphaldt, Tony R.

    All About Circuits is a website that â??provides a series of online textbooks covering electricity and electronics.â? Written by Tony R. Kuphaldt, the textbooks available here are wonderful resources for students, teachers, and anyone who is interested in learning more about electronics. This specific section, Resonance, is the sixth chapter in the Volume II textbook. Topics covered in this chapter include: electric pendulum, simple parallel resonance, simple series resonance, resonance in series-parallel circuits, and Q and bandwidth of a resonant circuit. Diagrams and detailed descriptions of concepts are included throughout the chapter to provide users with a comprehensive lesson. Visitors to the site are also encouraged to discuss concepts and topics using the All About Circuits discussion forums (registration with the site is required to post materials).

  13. Search for Light Resonances Decaying into Pairs of Muons as a Signal of New Physics

    SciTech Connect

    Chatrchyan, S. [Yerevan Physics Institute(Armenia)

    2011-07-01

    A search for groups of collimated muons is performed using a data sample collected by the CMS experiment at the LHC, at a centre-of-mass energy of 7 TeV, and corresponding to an integrated luminosity of 35 inverse picobarns. The analysis searches for production of new low-mass states decaying into pairs of muons and is designed to achieve high sensitivity to a broad range of models predicting leptonic jet signatures. With no excess observed over the background expectation, upper limits on the production cross section times branching fraction times acceptance are set, ranging from 0.1 to 0.5 pb at the 95% CL depending on event topology. In addition, the results are interpreted in several benchmark models in the context of supersymmetry with a new light dark sector exploring previously inaccessible parameter space.

  14. Search for Light Resonances Decaying into Pairs of Muons as a Signal of New Physics

    E-print Network

    CMS Collaboration

    2011-06-17

    A search for groups of collimated muons is performed using a data sample collected by the CMS experiment at the LHC, at a centre-of-mass energy of 7 TeV, and corresponding to an integrated luminosity of 35 inverse picobarns. The analysis searches for production of new low-mass states decaying into pairs of muons and is designed to achieve high sensitivity to a broad range of models predicting leptonic jet signatures. With no excess observed over the background expectation, upper limits on the production cross section times branching fraction times acceptance are set, ranging from 0.1 to 0.5 pb at the 95% CL depending on event topology. In addition, the results are interpreted in several benchmark models in the context of supersymmetry with a new light dark sector exploring previously inaccessible parameter space.

  15. Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at $\\sqrt{s} =$ 8 TeV

    SciTech Connect

    Khachatryan, Vardan [Yerevan Phys. Inst. (Armenia); et al.,

    2014-08-01

    A search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. Results are based on data corresponding to an integrated luminosity of 19.7 inverse femtobarns recorded in proton-proton collisions at $\\sqrt{s}$ = 8 TeV with the CMS detector at the CERN LHC. Techniques aiming at identifying jet substructures are used to analyze signal events in which the hadronization products from the decay of highly boosted W or Z bosons are contained within a single reconstructed jet. Upper limits on the production of generic WW, ZZ, or WZ resonances are set as a function of the resonance mass and width. We increase the sensitivity of the analysis by statistically combining the results of this search with a complementary study of the all-hadronic final state. Upper limits at 95% confidence level are set on the bulk graviton production cross section in the range from 700 to 10 femtobarns for resonance masses between 600 and 2500 GeV, respectively. These limits on the bulk graviton model are the most stringent to date in the diboson final state.

  16. Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at = 8 TeV

    NASA Astrophysics Data System (ADS)

    Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Gonzalez, J. Suarez; Alderweireldt, S.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Knutsson, A.; Luyckx, S.; Ochesanu, S.; Roland, B.; Rougny, R.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D'Hondt, J.; Daci, N.; Heracleous, N.; Kalogeropoulos, A.; Keaveney, J.; Kim, T. J.; Lowette, S.; Maes, M.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Dobur, D.; Favart, L.; Gay, A. P. R.; Grebenyuk, A.; Léonard, A.; Mohammadi, A.; Perniè, L.; Reis, T.; Seva, T.; Thomas, L.; Velde, C. Vander; Vanlaer, P.; Wang, J.; Adler, V.; Beernaert, K.; Benucci, L.; Cimmino, A.; Costantini, S.; Crucy, S.; Dildick, S.; Fagot, A.; Garcia, G.; Klein, B.; Mccartin, J.; Rios, A. A. Ocampo; Ryckbosch, D.; Diblen, S. Salva; Sigamani, M.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Beluffi, C.; Bruno, G.; Castello, R.; Caudron, A.; Ceard, L.; Da Silveira, G. G.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Jez, P.; Komm, M.; Lemaitre, V.; Liao, J.; Nuttens, C.; Pagano, D.; Pin, A.; Piotrzkowski, K.; Popov, A.; Quertenmont, L.; Selvaggi, M.; Marono, M. Vidal; Garcia, J. M. Vizan; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Martins, M. Correa; Martins, T. Dos Reis; Pol, M. E.; Aldá, W. L.; Carvalho, W.; Chinellato, J.; Custódio, A.; Da Costa, E. M.; De Jesus Damiao, D.; De Oliveira Martins, C.; De Souza, S. Fonseca; Malbouisson, H.; Malek, M.; Figueiredo, D. Matos; Mundim, L.; Nogima, H.; Da Silva, W. L. Prado; Santaolalla, J.; Santoro, A.; Sznajder, A.; Manganote, E. J. Tonelli; Pereira, A. Vilela; Bernardes, C. A.; Dias, F. A.; Tomei, T. R. Fernandez Perez; Gregores, E. M.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Aleksandrov, A.; Genchev, V.; Iaydjiev, P.; Marinov, A.; Piperov, S.; Rodozov, M.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Glushkov, I.; Hadjiiska, R.; Kozhuharov, V.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Chen, M.; Du, R.; Jiang, C. H.; Liang, D.; Liang, S.; Plestina, R.; Tao, J.; Wang, X.; Wang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Guo, Y.; Li, Q.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Wang, D.; Zhang, L.; Zou, W.; Avila, C.; Sierra, L. F. Chaparro; Florez, C.; Gomez, J. P.; Moreno, B. Gomez; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Kadija, K.; Luetic, J.; Mekterovic, D.; Sudic, L.; Attikis, A.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Bodlak, M.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Murumaa, M.; Raidal, M.; Tiko, A.; Eerola, P.; Fedi, G.; Voutilainen, M.; Härkönen, J.; Karimäki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Wendland, L.; Tuuva, T.; Besancon, M.; Couderc, F.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Favaro, C.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; de Monchenault, G. Hamel; Jarry, P.; Locci, E.; Malcles, J.; Nayak, A.; Rander, J.; Rosowsky, A.; Titov, M.; Baffioni, S.; Beaudette, F.; Busson, P.; Charlot, C.; Dahms, T.; Dalchenko, M.; Dobrzynski, L.; Filipovic, N.; Florent, A.; de Cassagnac, R. Granier; Mastrolorenzo, L.; Miné, P.; Mironov, C.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Paganini, P.; Salerno, R.; Sauvan, J. B.; Sirois, Y.; Veelken, C.; Yilmaz, Y.; Zabi, A.; Agram, J.-L.; Andrea, J.; Aubin, A.; Bloch, D.; Brom, J.-M.; Chabert, E. C.; Collard, C.; Conte, E.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Goetzmann, C.; Le Bihan, A.-C.; Van Hove, P.; Gadrat, S.; Beauceron, S.; Beaupere, N.; Boudoul, G.; Brochet, S.; Montoya, C. A. Carrillo; De Oliveira, A. Carvalho Antunes; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fan, J.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Alvarez, J. D. Ruiz; Sabes, D.; Sgandurra, L.; Sordini, V.; Donckt, M. Vander; Verdier, P.; Viret, S.; Xiao, H.

    2014-08-01

    A search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. Results are based on data corresponding to an integrated luminosity of 19.7 fb-1 recorded in proton-proton collisions at = 8 TeV with the CMS detector at the CERN LHC. Techniques aiming at identifying jet substructures are used to analyze signal events in which the hadronization products from the decay of highly boosted W or Z bosons are contained within a single reconstructed jet. Upper limits on the production of generic WW, ZZ, or WZ resonances are set as a function of the resonance mass and width. We increase the sensitivity of the analysis by statistically combining the results of this search with a complementary study of the all-hadronic final state. Upper limits at 95% confidence level are set on the bulk graviton production cross section in the range from 700 to 10 fb for resonance masses between 600 and 2500 GeV, respectively. These limits on the bulk graviton model are the most stringent to date in the diboson final state. [Figure not available: see fulltext.

  17. Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at sqrt(s) = 8 TeV

    E-print Network

    CMS Collaboration

    2014-09-02

    A search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. Results are based on data corresponding to an integrated luminosity of 19.7 inverse femtobarns recorded in proton-proton collisions at sqrt(s) = 8 TeV with the CMS detector at the CERN LHC. Techniques aiming at identifying jet substructures are used to analyze signal events in which the hadronization products from the decay of highly boosted W or Z bosons are contained within a single reconstructed jet. Upper limits on the production of generic WW, ZZ, or WZ resonances are set as a function of the resonance mass and width. We increase the sensitivity of the analysis by statistically combining the results of this search with a complementary study of the all-hadronic final state. Upper limits at 95% confidence level are set on the bulk graviton production cross section in the range from 700 to 10 femtobarns for resonance masses between 600 and 2500 GeV, respectively. These limits on the bulk graviton model are the most stringent to date in the diboson final state.

  18. {gamma}{gamma} decay of the f{sub 0}(1370) and f{sub 2}(1270) resonances in the hidden gauge formalism

    SciTech Connect

    Nagahiro, H. [Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047 (Japan); Yamagata-Sekihara, J. [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan); Oset, E. [Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047 (Japan); Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Apartado 22085, 46071 Valencia (Spain); Hirenzaki, S. [Department of Physics, Nara Women's University, Nara 630-8506 (Japan); Molina, R. [Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Apartado 22085, 46071 Valencia (Spain)

    2009-06-01

    Using recent results obtained within the hidden gauge formalism for vector mesons, in which the f{sub 0}(1370) and f{sub 2}(1270) resonances are dynamically generated resonances from the {rho}{rho} interaction, we evaluate the radiative decay of these resonances into {gamma}{gamma}. We obtain results for the width in good agreement with the experimental data for the f{sub 2}(1270) state and a width about a factor 2 smaller for the f{sub 0}(1370) resonance, which is also in agreement with the data of the Crystal Ball Collaboration and with the more recent ones from the Belle Collaboration, which, however, have a very large uncertainty.

  19. Decay of {sup 161m1,m2}Dy isomers under conditions of a resonance environment (Moessbauer Screen)

    SciTech Connect

    Loginov, Yu. E., E-mail: yurlo@pnpi.spb.ru; Zinoviev, V. G.; Kabina, L. P.; Lisin, S. S.; Maljutenkov, Ed. I. [Russian Academy of Sciences, Petersburg Nuclear Physics Institute (Russian Federation)

    2013-06-15

    The half-lives of the isomers {sup 161m1}Dy and {sup 161m2}Dy (E = 25.6 keV and T{sub 1/2} {approx} 30 ns for the former and E = 74.6 keV and T{sub 1/2} {approx} 3 ns for the latter) placed in a {sup 160}Gd{sub 2}O{sub 3} crystal lattice at T = 300 K and surrounded by stable {sup 161}Dy nuclei in the composition of {sup 161}Dy{sub 2}O{sub 3} were measured by the method of ({beta}-{gamma}) coincidences in the beta-decay process {sup 161}Tb {yields} {sup 161}Dy. Nuclei of {sup 161m1,m2}Dy were obtained according to the chain {sup 160}Gd(n, {gamma}){sup 161}Gd {yields} {sup 161}Tb {yields} {sup 161}Dy from {sup 160}Dy{sub 2}O{sub 3} weighted portions irradiated at the PWR-M reactor of the Petersburg Nuclear Physics Institute (PNPI, Gatchina, Russia). The T{sub 1/2} value observed for the isomer {sup 161m1}Dy was found to be correlated with the number of surrounding {sup 161}Dy nuclei. The presence of this correlation in {sup 161m1}Dy can be explained by the multiple resonance scattering of photons from isomer decay within the sample used. No such correlation was observed for {sup 161m2}Dy. The half-lives measured for the isomers {sup 161m1}Dy and {sup 161m2}Dy in the absence of the above environment are 29.2(1) and 3.50(1) ns, respectively.

  20. Decay of semi-diurnal internal-tide beams due to subharmonic resonance

    NASA Astrophysics Data System (ADS)

    Gerkema, Theo; Staquet, Chantal; Bouruet-Aubertot, Pascale

    2006-04-01

    Results of a numerical study on internal-tide generation are presented, using the nonlinear nonhydrostatic MIT-GCM. In the model runs, a lunar semidiurnal (M2) internal tide beam is generated over the continental shelf break. Its further nonlinear evolution is analysed, in particular the generation of M1 internal tides by Subharmonic Resonance (SR). This is done for three different latitudes: at a mid-latitude, slightly below (i.e., equatorward of) the critical latitude (poleward of which the M1 internal tide cannot propagate as a free wave), and at the equator. In the second case the M2 beam loses much energy to M1 already over the continental slope, yielding a pronounced spectral peak at M1, as well as a distinct M1 signal in the current velocity field. At the equator, the transfer to M1 is less pronounced, but still noticeable. Analysis of the growth rate of M1 yields a timescale of two days.

  1. Search for resonances decaying to ?c?+?- in two-photon interactions

    NASA Astrophysics Data System (ADS)

    Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G.; Lynch, G.; Koch, H.; Schroeder, T.; Asgeirsson, D. J.; Hearty, C.; Mattison, T. S.; McKenna, J. A.; So, R. Y.; Khan, A.; Blinov, V. E.; Buzykaev, A. R.; Druzhinin, V. P.; Golubev, V. B.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Yushkov, A. N.; Bondioli, M.; Kirkby, D.; Lankford, A. J.; Mandelkern, M.; Atmacan, H.; Gary, J. W.; Liu, F.; Long, O.; Vitug, G. M.; Campagnari, C.; Hong, T. M.; Kovalskyi, D.; Richman, J. D.; West, C. A.; Eisner, A. M.; Kroseberg, J.; Lockman, W. S.; Martinez, A. J.; Schumm, B. A.; Seiden, A.; Chao, D. S.; Cheng, C. H.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Porter, F. C.; Rakitin, A. Y.; Andreassen, R.; Huard, Z.; Meadows, B. T.; Sokoloff, M. D.; Sun, L.; Bloom, P. C.; Ford, W. T.; Gaz, A.; Nauenberg, U.; Smith, J. G.; Wagner, S. R.; Ayad, R.; Toki, W. H.; Spaan, B.; Schubert, K. R.; Schwierz, R.; Bernard, D.; Verderi, M.; Clark, P. J.; Playfer, S.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Munerato, M.; Negrini, M.; Piemontese, L.; Santoro, V.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Contri, R.; Guido, E.; Lo Vetere, M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Bhuyan, B.; Prasad, V.; Lee, C. L.; Morii, M.; Edwards, A. J.; Adametz, A.; Uwer, U.; Lacker, H. M.; Lueck, T.; Dauncey, P. D.; Behera, P. K.; Mallik, U.; Chen, C.; Cochran, J.; Meyer, W. T.; Prell, S.; Rubin, A. E.; Gritsan, A. V.; Guo, Z. J.; Arnaud, N.; Davier, M.; Derkach, D.; Grosdidier, G.; Le Diberder, F.; Lutz, A. M.; Malaescu, B.; Roudeau, P.; Schune, M. H.; Stocchi, A.; Wormser, G.; Lange, D. J.; Wright, D. M.; Chavez, C. A.; Coleman, J. P.; Fry, J. R.; Gabathuler, E.; Hutchcroft, D. E.; Payne, D. J.; Touramanis, C.; Bevan, A. J.; Di Lodovico, F.; Sacco, R.; Sigamani, M.; Cowan, G.; Brown, D. N.; Davis, C. L.; Denig, A. G.; Fritsch, M.; Gradl, W.; Griessinger, K.; Hafner, A.; Prencipe, E.; Barlow, R. J.; Jackson, G.; Lafferty, G. D.; Behn, E.; Cenci, R.; Hamilton, B.; Jawahery, A.; Roberts, D. A.; Dallapiccola, C.; Cowan, R.; Dujmic, D.; Sciolla, G.; Cheaib, R.; Lindemann, D.; Patel, P. M.; Robertson, S. H.; Biassoni, P.; Neri, N.; Palombo, F.; Stracka, S.; Cremaldi, L.; Godang, R.; Kroeger, R.; Sonnek, P.; Summers, D. J.; Nguyen, X.; Simard, M.; Taras, P.; De Nardo, G.; Monorchio, D.; Onorato, G.; Sciacca, C.; Martinelli, M.; Raven, G.; Jessop, C. P.; LoSecco, J. M.; Wang, W. F.; Honscheid, K.; Kass, R.; Brau, J.; Frey, R.; Sinev, N. B.; Strom, D.; Torrence, E.; Feltresi, E.; Gagliardi, N.; Margoni, M.; Morandin, M.; Posocco, M.; Rotondo, M.; Simi, G.; Simonetto, F.; Stroili, R.; Akar, S.; Ben-Haim, E.; Bomben, M.; Bonneaud, G. R.; Briand, H.; Calderini, G.; Chauveau, J.; Hamon, O.; Leruste, Ph.; Marchiori, G.; Ocariz, J.; Sitt, S.; Biasini, M.; Manoni, E.; Pacetti, S.; Rossi, A.; Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Perez, A.; Rizzo, G.; Walsh, J. J.; Lopes Pegna, D.; Olsen, J.; Smith, A. J. S.; Telnov, A. V.; Anulli, F.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Li Gioi, L.; Mazzoni, M. A.; Piredda, G.; Bünger, C.; Grünberg, O.; Hartmann, T.; Leddig, T.; Schröder, H.; Voss, C.; Waldi, R.; Adye, T.; Olaiya, E. O.; Wilson, F. F.; Emery, S.; Hamel de Monchenault, G.; Vasseur, G.; Yèche, Ch.; Aston, D.; Bard, D. J.; Bartoldus, R.; Benitez, J. F.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Ebert, M.; Field, R. C.; Franco Sevilla, M.; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P.; Hast, C.; Innes, W. R.; Kelsey, M. H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Lewis, P.; Lindquist, B.; Luitz, S.; Luth, V.; Lynch, H. L.; MacFarlane, D. B.; Muller, D. R.; Neal, H.; Nelson, S.; Perl, M.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Schindler, R. H.; Snyder, A.; Su, D.; Sullivan, M. K.; Va'vra, J.; Wagner, A. P.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Young, C. C.; Ziegler, V.; Park, W.; Purohit, M. V.; White, R. M.; Wilson, J. R.; Randle-Conde, A.; Sekula, S. J.; Bellis, M.; Burchat, P. R.; Miyashita, T. S.; Alam, M. S.; Ernst, J. A.; Gorodeisky, R.; Guttman, N.; Peimer, D. R.; Soffer, A.; Lund, P.; Spanier, S. M.; Ritchie, J. L.; Ruland, A. M.; Schwitters, R. F.; Wray, B. C.; Izen, J. M.; Lou, X. C.; Bianchi, F.; Gamba, D.; Lanceri, L.; Vitale, L.; Martinez-Vidal, F.; Oyanguren, A.; Ahmed, H.

    2012-11-01

    We report a study of the process ???X??c?+?-, where X stands for one of the resonances ?c2(1P), ?c(2S), X(3872), X(3915), or ?c2(2P). The analysis is performed with a data sample of 473.9fb-1 collected with the BABAR detector at the PEP-II asymmetric-energy electron-positron collider. We do not observe a significant signal for any channel, and calculate 90% confidence-level upper limits on the products of branching fractions and two-photon widths ?X???B(X??c?+?-): 15.7 eV for ?c2(1P), 133 eV for ?c(2S), 11.1 eV for X(3872) (assuming it to be a spin-2 state), 16 eV for X(3915) (assuming it to be a spin-2 state), and 18 eV for ?c2(2P). We also report upper limits on the ratios of branching fractions B(?c(2S)??c?+?-)/B(?c(2S)?KS0K+?-)<10.0 and B(?c2(1P)??c?+?-)/B(?c2(1P)?KS0K+?-)<32.9 at the 90% confidence level.

  2. Evidence for replicate 5p core levels in photoelectron spectra of Eu metal due to nonconstant kinetic-energy resonant Auger decay

    SciTech Connect

    Haffner, S. [Department of Physics and Ames Laboratory, U. S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States)] [Department of Physics and Ames Laboratory, U. S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States); Olson, C. G. [Department of Physics and Ames Laboratory, U. S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States)] [Department of Physics and Ames Laboratory, U. S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States); Lynch, D. W. [Department of Physics and Ames Laboratory, U. S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States)] [Department of Physics and Ames Laboratory, U. S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States)

    1999-12-15

    Satellites on the low-binding-energy side of core-level photoelectron emission due to extra 4f screening are a well-known feature in the x-ray photoelectron spectra of valence fluctuation materials and rare-earth metals. A notable exception is Eu metal, where up to now no low-binding-energy satellite has been observed. In this paper we show that in Eu metal the 4d-4f resonance can decay via a resonant Auger decay, which is not a constant kinetic-energy feature due to a rapid change of the strength of 4f screening with excitation energy, establishing a low-binding-energy replica of the 5p core-level photoelectron emission. (c) 1999 The American Physical Society.

  3. Search for resonances decaying to etac pi pi- in two-photon interactions

    SciTech Connect

    Lees, J.P.; Poireau, V.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Palano, A.; /Bari U. /INFN, Bari; Eigen, G.; Stugu, B.; /Bergen U.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; /LBL, Berkeley /UC, Berkeley; Koch, H.; Schroeder, T.; /Ruhr U., Bochum; Asgeirsson, D.J.; Hearty, C.; Mattison, T.S.; McKenna, J.A.; So, R.Y.; /British Columbia U.; Khan, A.; /Brunel U.; Blinov, V.E.; /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U.; /more authors..

    2012-06-18

    We report a study of the process {gamma}{gamma} {yields} X {yields} {eta}{sub c}{pi}{sup +}{pi}{sup -}, where X stands for one of the resonances {chi}{sub c2}(1P), {eta}{sub c}(2S), X(3872), X(3915), or {chi}{sub c2}(2P). The analysis is performed with a data sample of 473.9 fb{sup -1} collected with the BABAR detector at the PEP-II asymmetric-energy electron-positron collider. We do not observe a significant signal for any channel, and calculate 90% confidence-level upper limits on the products of branching fractions and two-photon widths {Lambda}{sub X{yields}{gamma}{gamma}} {Beta}(X {yields} {eta}{sub c}{pi}{sup +}{pi}{sup -}): 15.7 eV for {chi}{sub c2}(1P), 133 eV for {eta}{sub c}(2S), 11.1 eV for X(3872) (assuming it to be a spin-2 state), 16 eV for X(3915) (assuming it to be a spin-2 state), and 19 eV for {chi}{sub c2}(2P). We also report upper limits on the ratios of branching fractions {Beta}({eta}{sub c}(2S) {yields} {eta}{sub c}{pi}{sup +}{pi}{sup -})/{Beta}({eta}{sub c}(2S) {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -}) < 10.0 and {Beta}({chi}{sub c2}(1P) {yields} {eta}{sub c}{pi}{sup +}{pi}{sup -})/{Beta}({chi}{sub c2}(1P) {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -}) < 32.9 at the 90% confidence level.

  4. Search for WW and WZ resonances decaying to electron, missing ET, and two jets in ppbar collisions at sqrt(s) = 1.96 TeV

    E-print Network

    The CDF Collaboration; T. Aaltonen

    2010-04-28

    Using data from 2.9/fb of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We observed no statistically significant excess above the expected standard model background, and we set cross section limits at 95% confidence level on G*(Randall-Sundrum graviton), Z', and W' bosons. By comparing these limits to theoretical cross sections, mass exclusion regions for the three particles are derived. The mass exclusion regions for Z' and W' are further evaluated as a function of their gauge coupling strength.

  5. Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at sqrt(s) = 8 TeV

    E-print Network

    CMS Collaboration

    2014-09-02

    A search is reported for massive resonances decaying into a quark and a vector boson (W or Z), or two vector bosons (WW, WZ, or ZZ). The analysis is performed on an inclusive sample of multijet events corresponding to an integrated luminosity of 19.7 inverse femtobarns, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. The search uses novel jet-substructure identification techniques that provide sensitivity to the presence of highly boosted vector bosons decaying into a pair of quarks. Exclusion limits are set at a confidence level of 95% on the production of: (i) excited quark resonances q* decaying to qW and qZ for masses less than 3.2 TeV and 2.9 TeV, respectively, (ii) a Randall-Sundrum graviton G[RS] decaying into WW for masses below 1.2 TeV, and (iii) a heavy partner of the W boson W' decaying into WZ for masses less than 1.7 TeV. For the first time mass limits are set on W' to WZ and G[RS] to WW in the all-jets final state. The mass limits on q* to qW, q* to qZ, W' to WZ, G[RS] to WW are the most stringent to date. A model with a "bulk" graviton G[Bulk] that decays into WW or ZZ bosons is also studied.

  6. Heavy ion Coulomb excitation and gamma decay studies of the one and two phonon giant dipole resonances in {sup 208}Pb and {sup 209}Bi

    SciTech Connect

    Mueller, P.E.; Beene, J.R.; Bertrand, F.E. [and others] [and others

    1993-12-01

    Projectile -- photon coincidences were measured for the scattering of an 80 MeV/nucleon {sup 64}Zn beam from {sup 208}Pb and {sup 209}Bi targets at the GANIL heavy ion accelerator facility. Projectile-like particles between 0.5{degrees} and 4.5{degrees} relative to the incident beam direction were detected in the SPEG energy loss spectrometer where their momentum, charge, and mass were determined. Photons were detected in the BaF{sub 2} scintillation detector array TAPS. Light charged particles produced in the reaction were detected in the KVI Forward Wall. The analysis of the data acquired in this experiment is focused on three different phenomena: (1) the two phonon giant dipole resonance, (2) time dependence of the decay of the one phonon giant dipole resonance, and (3) giant resonance strength in projectile nuclei.

  7. Search for Z' resonances decaying to tt¯; in dilepton+jets final states in pp collisions at ?s=7 TeV

    DOE PAGESBeta

    Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Aguilo, E.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Pernicka, M.; Rabady, D.; Rahbaran, B.; Rohringer, C.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Luyckx, S.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D’Hondt, J.; Gonzalez Suarez, R.; Kalogeropoulos, A.; Maes, M.; Olbrechts, A.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Clerbaux, B.; De Lentdecker, G.; Dero, V.; Gay, A. P. R.; Hreus, T.; Léonard, A.; Marage, P. E.; Mohammadi, A.; Reis, T.; Thomas, L.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Adler, V.; Beernaert, K.; Cimmino, A.; Costantini, S.; Garcia, G.; Grunewald, M.; Klein, B.; Lellouch, J.; Marinov, A.; Mccartin, J.; Ocampo Rios, A. A.; Ryckbosch, D.; Sigamani, M.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Walsh, S.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Bruno, G.; Castello, R.; Ceard, L.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Lemaitre, V.; Liao, J.; Militaru, O.; Nuttens, C.; Pagano, D.; Pin, A.; Piotrzkowski, K.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Correa Martins Junior, M.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Aldá Júnior, W. L.; Carvalho, W.; Custódio, A.; Da Costa, E. M.; De Jesus Damiao, D.; De Oliveira Martins, C.; Fonseca De Souza, S.; Malbouisson, H.; Malek, M.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Prado Da Silva, W. L.; Santoro, A.; Soares Jorge, L.; Sznajder, A.; Vilela Pereira, A.; Anjos, T. S.; Bernardes, C. A.; Dias, F. A.; Fernandez Perez Tomei, T. R.; Gregores, E. M.; Lagana, C.; Marinho, F.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Genchev, V.; Iaydjiev, P.; Piperov, S.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Tcholakov, V.; Trayanov, R.; Vutova, M.; Dimitrov, A.; Hadjiiska, R.; Kozhuharov, V.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Jiang, C. H.; Liang, D.; Liang, S.; Meng, X.; Tao, J.; Wang, J.; Wang, X.; Wang, Z.; Xiao, H.; Xu, M.; Zang, J.; Zhang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Guo, Y.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Teng, H.; Wang, D.; Zhang, L.; Zou, W.; Avila, C.; Carrillo Montoya, C. A.; Gomez, J. P.; Gomez Moreno, B.; Osorio Oliveros, A. F.; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Plestina, R.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Duric, S.; Kadija, K.; Luetic, J.; Mekterovic, D.; Morovic, S.; Tikvica, L.; Attikis, A.; Galanti, M.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Ellithi Kamel, A.; Kuotb Awad, A. M.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Müntel, M.; Murumaa, M.; Raidal, M.; Rebane, L.; Tiko, A.; Eerola, P.; Fedi, G.; Voutilainen, M.; Härkönen, J.; Heikkinen, A.; Karimäki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Ungaro, D.; Wendland, L.; Korpela, A.; Tuuva, T.; Besancon, M.; Choudhury, S.; Couderc, F.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; Hamel de Monchenault, G.; Jarry, P.; Locci, E.; Malcles, J.; Millischer, L.; Nayak, A.; Rander, J.; Rosowsky, A.; Titov, M.; Baffioni, S.; Beaudette, F.; Benhabib, L.; Bianchini, L.; Bluj, M.; Busson, P.; Charlot, C.; Daci, N.; Dahms, T.; Dalchenko, M.; Dobrzynski, L.; Florent, A.; Granier de Cassagnac, R.; Haguenauer, M.; Miné, P.; Mironov, C.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Paganini, P.; Sabes, D.; Salerno, R.; Sirois, Y.; Veelken, C.; Zabi, A.; Agram, J.-L.; Andrea, J.; Bloch, D.; Bodin, D.; Brom, J.-M.; Cardaci, M.; Chabert, E. C.; Collard, C.; Conte, E.; Drouhin, F.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Juillot, P.; Le Bihan, A.-C.; Van Hove, P.; Beauceron, S.; Beaupere, N.; Bondu, O.; Boudoul, G.; Brochet, S.; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Sgandurra, L.; Sordini, V.; Tschudi, Y.; Verdier, P.; Viret, S.; Tsamalaidze, Z.; Autermann, C.; Beranek, S.; Calpas, B.; Edelhoff, M.; Feld, L.

    2013-04-01

    A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at ?s=7 TeV corresponding to an integrated luminosity of 5.0 b?¹. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Z' is excluded at the 95% confidence level for resonance masses MZ'Z'=0.012MZ', and MZ'=0.10MZ'.

  8. Hot Molecular Cores and High-Mass Star Formation

    E-print Network

    F. F. S. van der Tak

    2003-09-04

    This review covers hot cores in the context of high-mass star formation. After giving an overview of chemical processes and diversity during high-mass star formation, it reviews the `warm envelope' phase which probably precedes the formation of hot cores. Some recent determinations of the cosmic-ray ionization rate are discussed, as well as recent evidence for hot cores around low-mass stars. Routes for future hot core research are outlined.

  9. Search for WW and WZ Resonances Decaying to Electron, Missing E[subscript T], and Two Jets in pp[over-bar] Collisions at [sqrt]s=1.96??TeV.

    E-print Network

    Paus, Christoph M. E.

    Using data from 2.9??fb[superscript -1] of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into ...

  10. SiO outflows in high-mass star forming regions: a potential chemical clock

    NASA Astrophysics Data System (ADS)

    Lopez-Sepulcre, A.; Walmsley, M.; Cesaroni, R.; Codella, C.; Schuller, F.; Bronfman, L.; Carey, S. J.; Menten, K.; Molinari, S.; Noriega-Crespo, A.

    2011-05-01

    Some theoretical models propose that O-B stars form via accretion, in a similar fashion to low-mass stars. Jet-driven molecular outflows play an important role in this scenario, and their study can help to understand the process of high-mass star formation and the different evolutionary phases involved. Observations towards low-mass protostars so far favour an evolutionary picture in which jets are always associated with Class 0 objects while more evolved Class I/II objects show less evidence of powerful jets. The study presented here has aimed at checking whether an analogous picture can be found in the high-mass case. For this purpose, a sample of 57 high-mass molecular clumps in different evolutionary stages has been observed in the SiO(2--1) and (3--2) transitions with the IRAM 30-m telescope (Spain). SiO emission at high velocities, characteristic of molecular jets, is detected in 88% of our sources, a very high detection rate indicating that there is ongoing star formation activity in most of the sources of our sample. The most remarkable finding is an SiO(2--1) luminosity decay with the ratio of bolometric luminosity to mass of the clump, Lbol/M, which suggests that jet activity declines as time evolves. This result represents the first clear evidence of a decrease of SiO outflow luminosity with time in a homogeneous sample of high-mass molecular clumps in different evolutionary stages. The SiO(3--2) to SiO(2--1) integrated intensity ratio shows only minor changes with evolutionary state.

  11. Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at ?s = 8 TeV

    DOE PAGESBeta

    Khachatryan, Vardan

    2015-07-01

    Results are reported of a general search for pair production of heavy resonances decaying to pairs of jets in events with at least four jets. The study is based on up to 19.4 inverse femtobarns of integrated luminosity from proton-proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The firstmore »assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.« less

  12. Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at $\\sqrt{s}$ = 8 TeV

    E-print Network

    Khachatryan, Vardan; Tumasyan, Armen; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Erö, Janos; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hartl, Christian; Hörmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Kiesenhofer, Wolfgang; Knünz, Valentin; Krammer, Manfred; Krätschmer, Ilse; Liko, Dietrich; Mikulec, Ivan; Rabady, Dinyar; Rahbaran, Babak; Rohringer, Herbert; Schöfbeck, Robert; Strauss, Josef; Treberer-Treberspurg, Wolfgang; Waltenberger, Wolfgang; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Alderweireldt, Sara; Bansal, Sunil; Cornelis, Tom; De Wolf, Eddi A; Janssen, Xavier; Knutsson, Albert; Lauwers, Jasper; Luyckx, Sten; Ochesanu, Silvia; Rougny, Romain; Van De Klundert, Merijn; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Van Spilbeeck, Alex; Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen; Daci, Nadir; Heracleous, Natalie; Keaveney, James; Lowette, Steven; Maes, Michael; Olbrechts, Annik; Python, Quentin; Strom, Derek; Tavernier, Stefaan; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Villella, Ilaria; Caillol, Cécile; Clerbaux, Barbara; De Lentdecker, Gilles; Dobur, Didar; Favart, Laurent; Gay, Arnaud; Grebenyuk, Anastasia; Léonard, Alexandre; Mohammadi, Abdollah; Perniè, Luca; Randle-conde, Aidan; Reis, Thomas; Seva, Tomislav; Thomas, Laurent; Vander Velde, Catherine; Vanlaer, Pascal; Wang, Jian; Zenoni, Florian; Adler, Volker; Beernaert, Kelly; Benucci, Leonardo; Cimmino, Anna; Costantini, Silvia; Crucy, Shannon; Dildick, Sven; Fagot, Alexis; Garcia, Guillaume; Mccartin, Joseph; Ocampo Rios, Alberto Andres; Poyraz, Deniz; Ryckbosch, Dirk; Salva Diblen, Sinem; Sigamani, Michael; Strobbe, Nadja; Thyssen, Filip; Tytgat, Michael; Yazgan, Efe; Zaganidis, Nicolas; Basegmez, Suzan; Beluffi, Camille; Bruno, Giacomo; Castello, Roberto; Caudron, Adrien; Ceard, Ludivine; Da Silveira, Gustavo Gil; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Giammanco, Andrea; Hollar, Jonathan; Jafari, Abideh; Jez, Pavel; Komm, Matthias; Lemaitre, Vincent; Nuttens, Claude; Perrini, Lucia; Pin, Arnaud; Piotrzkowski, Krzysztof; Popov, Andrey; Quertenmont, Loic; Selvaggi, Michele; Vidal Marono, Miguel; Vizan Garcia, Jesus Manuel; Beliy, Nikita; Caebergs, Thierry; Daubie, Evelyne; Hammad, Gregory Habib; Aldá Júnior, Walter Luiz; Alves, Gilvan; Brito, Lucas; Correa Martins Junior, Marcos; Dos Reis Martins, Thiago; Molina, Jorge; Mora Herrera, Clemencia; Pol, Maria Elena; Rebello Teles, Patricia; Carvalho, Wagner; Chinellato, Jose; Custódio, Analu; Da Costa, Eliza Melo; De Jesus Damiao, Dilson; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Malbouisson, Helena; Matos Figueiredo, Diego; Mundim, Luiz; Nogima, Helio; Prado Da Silva, Wanda Lucia; Santaolalla, Javier; Santoro, Alberto; Sznajder, Andre; Tonelli Manganote, Edmilson José; Vilela Pereira, Antonio; Bernardes, Cesar Augusto; Dogra, Sunil; Tomei, Thiago; De Moraes Gregores, Eduardo; Mercadante, Pedro G; Novaes, Sergio F; Padula, Sandra; Aleksandrov, Aleksandar; Genchev, Vladimir; Hadjiiska, Roumyana; Iaydjiev, Plamen; Marinov, Andrey; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Vutova, Mariana; Dimitrov, Anton; Glushkov, Ivan; Litov, Leander; Pavlov, Borislav; Petkov, Peicho; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Chen, Mingshui; Cheng, Tongguang; Du, Ran; Jiang, Chun-Hua; Plestina, Roko; Romeo, Francesco; Tao, Junquan; Wang, Zheng; Asawatangtrakuldee, Chayanit; Ban, Yong; Li, Qiang; Liu, Shuai; Mao, Yajun; Qian, Si-Jin; Wang, Dayong; Xu, Zijun; Zou, Wei; Avila, Carlos; Cabrera, Andrés; Chaparro Sierra, Luisa Fernanda; Florez, Carlos; Gomez, Juan Pablo; Gomez Moreno, Bernardo; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Kovac, Marko; Brigljevic, Vuko; Kadija, Kreso; Luetic, Jelena; Mekterovic, Darko; Sudic, Lucija; Attikis, Alexandros; Mavromanolakis, Georgios; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A; Bodlak, Martin; Finger, Miroslav; Finger Jr, Michael; Assran, Yasser; Elgammal, Sherif; Ellithi Kamel, Ali; Radi, Amr; Kadastik, Mario; Murumaa, Marion; Raidal, Martti; Tiko, Andres; Eerola, Paula; Voutilainen, Mikko; Härkönen, Jaakko; Karimäki, Veikko; Kinnunen, Ritva; Kortelainen, Matti J; Lampén, Tapio; Lassila-Perini, Kati; Lehti, Sami; Lindén, Tomas; Luukka, Panja-Riina; Mäenpää, Teppo; Peltola, Timo; Tuominen, Eija; Tuominiemi, Jorma; Tuovinen, Esa; Wendland, Lauri; Talvitie, Joonas

    2015-01-01

    Results are reported of a general search for pair production of heavy resonances decaying to pairs of jets in events with at least four jets. The study is based on up to 19.4 fb$^{-1}$ of integrated luminosity from proton-proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.

  13. Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at ?{ s} = 8 TeV

    NASA Astrophysics Data System (ADS)

    Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Knutsson, A.; Lauwers, J.; Luyckx, S.; Ochesanu, S.; Rougny, R.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D'Hondt, J.; Daci, N.; Heracleous, N.; Keaveney, J.; Lowette, S.; Maes, M.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Dobur, D.; Favart, L.; Gay, A. P. R.; Grebenyuk, A.; Léonard, A.; Mohammadi, A.; Perniè, L.; Randle-conde, A.; Reis, T.; Seva, T.; Thomas, L.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Zenoni, F.; Adler, V.; Beernaert, K.; Benucci, L.; Cimmino, A.; Costantini, S.; Crucy, S.; Dildick, S.; Fagot, A.; Garcia, G.; Mccartin, J.; Ocampo Rios, A. A.; Poyraz, D.; Ryckbosch, D.; Salva Diblen, S.; Sigamani, M.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Beluffi, C.; Bruno, G.; Castello, R.; Caudron, A.; Ceard, L.; Da Silveira, G. G.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Jafari, A.; Jez, P.; Komm, M.; Lemaitre, V.; Nuttens, C.; Perrini, L.; Pin, A.; Piotrzkowski, K.; Popov, A.; Quertenmont, L.; Selvaggi, M.; Vidal Marono, M.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Aldá Júnior, W. L.; Alves, G. A.; Brito, L.; Correa Martins Junior, M.; Dos Reis Martins, T.; Molina, J.; Mora Herrera, C.; Pol, M. E.; Rebello Teles, P.; Carvalho, W.; Chinellato, J.; Custódio, A.; Da Costa, E. M.; De Jesus Damiao, D.; De Oliveira Martins, C.; Fonseca De Souza, S.; Malbouisson, H.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Prado Da Silva, W. L.; Santaolalla, J.; Santoro, A.; Sznajder, A.; Tonelli Manganote, E. J.; Vilela Pereira, A.; Bernardes, C. A.; Dogra, S.; Fernandez Perez Tomei, T. R.; Gregores, E. M.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Aleksandrov, A.; Genchev, V.; Hadjiiska, R.; Iaydjiev, P.; Marinov, A.; Piperov, S.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Glushkov, I.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Chen, M.; Cheng, T.; Du, R.; Jiang, C. H.; Plestina, R.; Romeo, F.; Tao, J.; Wang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Li, Q.; Liu, S.; Mao, Y.; Qian, S. J.; Wang, D.; Xu, Z.; Zou, W.; Avila, C.; Cabrera, A.; Chaparro Sierra, L. F.; Florez, C.; Gomez, J. P.; Gomez Moreno, B.; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Kadija, K.; Luetic, J.; Mekterovic, D.; Sudic, L.; Attikis, A.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Bodlak, M.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Ellithi Kamel, A.; Radi, A.; Kadastik, M.; Murumaa, M.; Raidal, M.; Tiko, A.; Eerola, P.; Voutilainen, M.; Härkönen, J.; Karimäki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Wendland, L.; Talvitie, J.; Tuuva, T.; Besancon, M.; Couderc, F.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Favaro, C.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; Hamel de Monchenault, G.; Jarry, P.; Locci, E.; Malcles, J.; Rander, J.; Rosowsky, A.; Titov, M.; Baffioni, S.; Beaudette, F.; Busson, P.; Chapon, E.; Charlot, C.; Dahms, T.; Dalchenko, M.; Dobrzynski, L.; Filipovic, N.; Florent, A.; Granier de Cassagnac, R.; Mastrolorenzo, L.; Miné, P.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Ortona, G.; Paganini, P.; Regnard, S.; Salerno, R.; Sauvan, J. B.; Sirois, Y.; Veelken, C.; Yilmaz, Y.; Zabi, A.; Agram, J.-L.; Andrea, J.; Aubin, A.; Bloch, D.; Brom, J.-M.; Chabert, E. C.; Collard, C.; Conte, E.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Goetzmann, C.; Le Bihan, A.-C.; Skovpen, K.; Van Hove, P.; Gadrat, S.; Beauceron, S.; Beaupere, N.; Bernet, C.; Boudoul, G.; Bouvier, E.; Brochet, S.; Carrillo Montoya, C. A.; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fan, J.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Ruiz Alvarez, J. D.; Sabes, D.; Sgandurra, L.; Sordini, V.; Vander Donckt, M.

    2015-07-01

    Results are reported of a general search for pair production of heavy resonances decaying to pairs of hadronic jets in events with at least four jets. The study is based on up to 19.4 fb-1 of integrated luminosity from proton-proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.

  14. Two-pion decay of the P 11(1440) resonance excited in ?p Scattering at 1 GeV/nucleon

    NASA Astrophysics Data System (ADS)

    Alkhazov, G. D.; Prokofiev, A. N.; Smirnov, I. B.

    2008-07-01

    Semiexclusive measurements of the two-pion production reaction p( ?, ?') p?? have been carried out at an energy of E ? = 4.2 GeV at the Saturne-II (Saclay) accelerator with the SPES4- ? installation. The two-pion production reaction was investigated by simultaneous registration of the scattered ? particle and the secondary proton. The obtained results show that the two-pion decay of the P 11(1440) resonance excited in the target proton in this reaction proceeds predominantly with emission of two pions in the isospin I = 0, S-wave state.

  15. Search for a new resonance decaying to a W or Z boson and a Higgs boson in the final states with the ATLAS detector

    NASA Astrophysics Data System (ADS)

    Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Adelman, J.; Adomeit, S.; Adye, T.; Affolder, A. A.; Agatonovic-Jovin, T.; Aguilar-Saavedra, J. A.; Ahlen, S. P.; Ahmadov, F.; Aielli, G.; Akerstedt, H.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alberghi, G. L.; Albert, J.; Albrand, S.; Alconada Verzini, M. J.; Aleksa, M.; Aleksandrov, I. N.; Alexa, C.; Alexander, G.; Alexopoulos, T.; Alhroob, M.; Alimonti, G.; Alio, L.; Alison, J.; Alkire, S. P.; Allbrooke, B. M. M.; Allport, P. P.; Aloisio, A.; Alonso, A.; Alonso, F.; Alpigiani, C.; Altheimer, A.; Alvarez Gonzalez, B.; Piqueras, D. Álvarez; Alviggi, M. G.; Amadio, B. T.; Amako, K.; Amaral Coutinho, Y.; Amelung, C.; Amidei, D.; Amor Dos Santos, S. P.; Amorim, A.; Amoroso, S.; Amram, N.; Amundsen, G.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anders, J. K.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Angelidakis, S.; Angelozzi, I.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A. V.; Anjos, N.; Annovi, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aperio Bella, L.; Arabidze, G.; Arai, Y.; Araque, J. P.; Arce, A. T. H.; Arduh, F. A.; Arguin, J.-F.; Argyropoulos, S.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnold, H.; Arratia, M.; Arslan, O.; Artamonov, A.; Artoni, G.; Asai, S.; Asbah, N.; Ashkenazi, A.; Åsman, B.; Asquith, L.; Assamagan, K.; Astalos, R.; Atkinson, M.; Atlay, N. B.; Auerbach, B.; Augsten, K.; Aurousseau, M.; Avolio, G.; Axen, B.; Ayoub, M. K.; Azuelos, G.; Baak, M. A.; Baas, A. E.; Bacci, C.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Badescu, E.; Bagiacchi, P.; Bagnaia, P.; Bai, Y.; Bain, T.; Baines, J. T.; Baker, O. K.; Balek, P.; Balestri, T.; Balli, F.; Banas, E.; Banerjee, Sw.; Bannoura, A. A. E.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barberio, E. L.; Barberis, D.; Barbero, M.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnes, S. L.; Barnett, B. M.; Barnett, R. M.; Barnovska, Z.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Bartoldus, R.; Barton, A. E.; Bartos, P.; Bassalat, A.; Basye, A.; Bates, R. L.; Batista, S. J.; Batley, J. R.; Battaglia, M.; Bauce, M.; Bauer, F.; Bawa, H. S.; Beacham, J. B.; Beattie, M. D.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, M.; Becker, S.; Beckingham, M.; Becot, C.; Beddall, A. J.; Beddall, A.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Beermann, T. A.; Begel, M.; Behr, J. K.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellomo, M.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bender, M.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Bensinger, J. R.; Bentvelsen, S.; Beresford, L.; Beretta, M.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Beringer, J.; Bernard, C.; Bernard, N. R.; Bernius, C.; Bernlochner, F. U.; Berry, T.; Berta, P.; Bertella, C.; Bertoli, G.; Bertolucci, F.; Bertsche, C.; Bertsche, D.; Besana, M. I.; Besjes, G. J.; Bessidskaia Bylund, O.; Bessner, M.; Besson, N.; Betancourt, C.; Bethke, S.; Beven, A. J.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Biglietti, M.; Bilbao De Mendizabal, J.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Black, C. W.; Black, J. E.; Black, K. M.; Blackburn, D.; Blair, R. E.; Blanchard, J.-B.; Blanco, J. E.; Blazek, T.; Bloch, I.; Blocker, C.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Bock, C.; Boehler, M.; Bogaerts, J. A.; Bogdanchikov, A. G.; Bohm, C.; Boisvert, V.; Bold, T.; Boldea, V.; Boldyrev, A. S.; Bomben, M.; Bona, M.; Boonekamp, M.; Borisov, A.; Borissov, G.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boudreau, J.; Bouffard, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozic, I.; Bracinik, J.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brendlinger, K.; Brennan, A. J.; Brenner, L.; Brenner, R.; Bressler, S.; Bristow, K.; Bristow, T. M.; Britton, D.; Britzger, D.; Brochu, F. M.; Brock, I.; Brock, R.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brosamer, J.; Brost, E.; Brown, J.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Bruni, A.; Bruni, G.; Bruschi, M.; Bryngemark, L.; Buanes, T.; Buat, Q.; Buchholz, P.; Buckley, A. G.; Buda, S. I.; Budagov, I. A.; Buehrer, F.; Bugge, L.

    2015-06-01

    A search for a new resonance decaying to a W or Z boson and a Higgs boson in the final states is performed using 20.3 fb of pp collision data recorded at 8 TeV with the ATLAS detector at the Large Hadron Collider. The search is conducted by examining the WH / ZH invariant mass distribution for a localized excess. No significant deviation from the Standard Model background prediction is observed. The results are interpreted in terms of constraints on the Minimal Walking Technicolor model and on a simplified approach based on a phenomenological Lagrangian of Heavy Vector Triplets.

  16. Rotating disks in high-mass young stellar objects

    E-print Network

    Maria T. Beltran; Riccardo Cesaroni; Roberto Neri; Claudio Codella; Ray S. Furuya; Leonardo Testi; Luca Olmi

    2003-12-18

    We report on the detection of four rotating massive disks in two regions of high-mass star formation. The disks are perpendicular to known bipolar outflows and turn out to be unstable but long lived. We infer that accretion onto the embedded (proto)stars must proceed through the disks with rates of ~10E-2 Msun/yr.

  17. Testing macroscopic realism through high-mass interferometry

    E-print Network

    Clive Emary; J. P. Cotter; Markus Arndt

    2014-08-07

    We define a quantum witness for high-mass matter-wave interferometers that allows us to test fundamental assumptions of macroscopic realism. We propose an experimental realisation using absorptive laser gratings and show that such systems can strongly violate a macrorealistic quantum-witness equality. The measurement of the witness can therefore provide clear evidence of physics beyond macrorealism for macromolecules and nanoparticles.

  18. An instrument for fast acquisition of fluorescence decay curves at picosecond resolution designed for ``double kinetics'' experiments: Application to fluorescence resonance excitation energy transfer study of protein folding

    NASA Astrophysics Data System (ADS)

    Ishay, Eldad Ben; Hazan, Gershon; Rahamim, Gil; Amir, Dan; Haas, Elisha

    2012-08-01

    The information obtained by studying fluorescence decay of labeled biopolymers is a major resource for understanding the dynamics of their conformations and interactions. The lifetime of the excited states of probes attached to macromolecules is in the nanosecond time regime, and hence, a series of snapshot decay curves of such probes might - in principle - yield details of fast changes of ensembles of labeled molecules down to sub-microsecond time resolution. Hence, a major current challenge is the development of instruments for the low noise detection of fluorescence decay curves within the shortest possible time intervals. Here, we report the development of an instrument, picosecond double kinetics apparatus, that enables recording of multiple fluorescence decay curves with picosecond excitation pulses over wide spectral range during microsecond data collection for each curve. The design is based on recording and averaging multiphoton pulses of fluorescence decay using a fast 13 GHz oscilloscope during microsecond time intervals at selected time points over the course of a chemical reaction or conformational transition. We tested this instrument in a double kinetics experiment using reference probes (N-acetyl-tryptophanamide). Very low stochastic noise level was attained, and reliable multi-parameter analysis such as derivation of distance distributions from time resolved FRET (fluorescence resonance excitation energy transfer) measurements was achieved. The advantage of the pulse recording and averaging approach used here relative to double kinetics methods based on the established time correlated single photon counting method, is that in the pulse recording approach, averaging of substantially fewer kinetic experiments is sufficient for obtaining the data. This results in a major reduction in the consumption of labeled samples, which in many cases, enables the performance of important experiments that were not previously feasible.

  19. Observation of a Resonance in B[superscript +]?K[superscript +]?[superscript +]?[superscript -] Decays at Low Recoil

    E-print Network

    Williams, Michael

    A broad peaking structure is observed in the dimuon spectrum of B[superscript +]?K[superscript +]?[superscript +]?[superscript -] decays in the kinematic region where the kaon has a low recoil against the dimuon system. ...

  20. The strength of the analog and Gamow-Teller giant resonances and hindrance of the 2 ???-decay rate

    Microsoft Academic Search

    O. A. Rumyantsev; M. H. Urin

    1998-01-01

    An approach for describing the hindrance of the nuclear 2???-decay amplitude is proposed. The approach is based on a new formula obtained by a model-independent transformation of the initial expression for the amplitude. This formula takes explicitly into account the hindrance of the decay-amplitude due to the presence of the collective Gamow-Teller state. Calculations are performed within the simplest version

  1. Search for production of $WW/WZ$ resonances decaying to a lepton, neutrino and jets in $pp$ collisions at $\\sqrt{s}$ = 8 TeV with the ATLAS detector

    E-print Network

    ATLAS Collaboration

    2015-05-22

    A search is presented for narrow diboson resonances decaying to $WW$ or $WZ$ in the final state where one $W$ boson decays leptonically (to an electron or a muon plus a neutrino) and the other $W/Z$ boson decays hadronically. The analysis is performed using an integrated luminosity of 20.3 fb$^{-1}$ of $pp$ collisions at $\\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the LHC. No evidence for resonant diboson production is observed, and resonance masses below 700 GeV and 1490 GeV are excluded at 95% confidence level for the spin-2 Randall-Sundrum bulk graviton $G^*$ with coupling constant of 1.0 and the extended gauge model $W'$ boson respectively.

  2. Search for High-Mass States with Lepton Plus Missing Transverse Energy Using the ATLAS Detector at Center-of-Mass Energy of 7 TeV

    E-print Network

    James Degenhardt

    2011-09-28

    The ATLAS detector has been used to search for high-mass states decaying into a single high momentum lepton and missing transverse energy, such as new heavy charged gauge bosons. The latest search results for a W Prime boson decaying to lepton plus neutrino in 1.04 fb^-1 of proton-proton collisions at a center of mass energy of 7 TeV produced at the Large Hadron Collider are presented.

  3. Search for high-mass states with one lepton plus missing transverse momentum in proton–proton collisions at ?s = 7 TeV with the ATLAS detector

    E-print Network

    Taylor, Frank E.

    The ATLAS detector is used to search for high-mass states, such as heavy charged gauge bosons (W?,W*), decaying to a charged lepton (electron or muon) and a neutrino. Results are presented based on the analysis of pp ...

  4. High-mass star-formation rates in M33

    NASA Technical Reports Server (NTRS)

    Wilson, Christine D.; Scoville, Nick; Rice, Walter

    1991-01-01

    The H I, CO, and H-alpha data for M33 are analyzed to obtain high-mass star formation rates and efficiencies and to look for variations in these quantities within the inner disk of M33. Star formation rates and efficiencies are calculated using calibrated H-alpha data. The H-alpha emission in this region of the galaxy corresponds to high-mass and total star-formation rates of 0.007 and 0.04 solar mass/yr, respectively. These results agree reasonably well with the rates calculated from the 60 and 100-micron IRAS emission. The star formation rates obtained form FIR and H-alpha luminosities are compared with those obtained from optical photometry.

  5. High-mass star-formation rates in M33

    SciTech Connect

    Wilson, C.D.; Scoville, N.; Rice, W. (California Institute of Technology, Pasadena (USA) JPL, Pasadena, CA (USA))

    1991-04-01

    The H I, CO, and H-alpha data for M33 are analyzed to obtain high-mass star formation rates and efficiencies and to look for variations in these quantities within the inner disk of M33. Star formation rates and efficiencies are calculated using calibrated H-alpha data. The H-alpha emission in this region of the galaxy corresponds to high-mass and total star-formation rates of 0.007 and 0.04 solar mass/yr, respectively. These results agree reasonably well with the rates calculated from the 60 and 100-micron IRAS emission. The star formation rates obtained form FIR and H-alpha luminosities are compared with those obtained from optical photometry. 35 refs.

  6. Generic, Long, High Mass Ratio Binary Black Hole Inspiral Simulations

    NASA Astrophysics Data System (ADS)

    Zimmerman, Aaron; Lewis, Adam; Pfeiffer, Harald; SXS Collaboration

    2015-04-01

    We present for the first time high mass ratio (q = 5 and q = 7), long (40 - 50 pericenter passages), eccentric and precessing binary black hole inspirals. These inspirals are well suited for comparison to both analytic Post-Newtonian theory and to the motion of a small mass around a central black hole with gravitational self-force corrections. We discuss the properties of these inspirals, our initial comparisons, and future directions.

  7. Search for dilepton resonances in pp collisions at ?s=7 TeV with the ATLAS detector.

    PubMed

    Aad, G; Abbott, B; Abdallah, J; Abdelalim, A A; Abdesselam, A; Abdinov, O; Abi, B; Abolins, M; Abramowicz, H; Abreu, H; Acerbi, E; Acharya, B S; Adams, D L; Addy, T N; Adelman, J; Aderholz, M; Adomeit, S; Adragna, P; Adye, T; Aefsky, S; Aguilar-Saavedra, J A; Aharrouche, M; Ahlen, S P; Ahles, F; Ahmad, A; Ahsan, M; Aielli, G; Akdogan, T; Akesson, T P A; Akimoto, G; Akimov, A V; Akiyama, A; Alam, M S; Alam, M A; Albert, J; Albrand, S; Aleksa, M; Aleksandrov, I N; Alessandria, F; Alexa, C; Alexander, G; Alexandre, G; Alexopoulos, T; Alhroob, M; Aliev, M; Alimonti, G; Alison, J; Aliyev, M; Allport, P P; Allwood-Spiers, S E; Almond, J; Aloisio, A; Alon, R; Alonso, A; Alviggi, M G; Amako, K; Amaral, P; Amelung, C; Ammosov, V V; Amorim, A; Amorós, G; Amram, N; Anastopoulos, C; Ancu, L S; Andari, N; Andeen, T; Anders, C F; Anders, G; Anderson, K J; Andreazza, A; Andrei, V; Andrieux, M-L; Anduaga, X S; Angerami, A; Anghinolfi, F; Anjos, N; Annovi, A; Antonaki, A; Antonelli, M; Antonov, A; Antos, J; Anulli, F; Aoun, S; Aperio Bella, L; Apolle, R; Arabidze, G; Aracena, I; Arai, Y; Arce, A T H; Archambault, J P; Arfaoui, S; Arguin, J-F; Arik, E; Arik, M; Armbruster, A J; Arnaez, O; Arnault, C; Artamonov, A; Artoni, G; Arutinov, D; Asai, S; Asfandiyarov, R; Ask, S; Asman, B; Asquith, L; Assamagan, K; Astbury, A; Astvatsatourov, A; Atoian, G; Aubert, B; Auge, E; Augsten, K; Aurousseau, M; Austin, N; Avolio, G; Avramidou, R; Axen, D; Ay, C; Azuelos, G; Azuma, Y; Baak, M A; Baccaglioni, G; Bacci, C; Bach, A M; Bachacou, H; Bachas, K; Bachy, G; Backes, M; Backhaus, M; Badescu, E; Bagnaia, P; Bahinipati, S; Bai, Y; Bailey, D C; Bain, T; Baines, J T; Baker, O K; Baker, M D; Baker, S; Banas, E; Banerjee, P; Banerjee, Sw; Banfi, D; Bangert, A; Bansal, V; Bansil, H S; Barak, L; Baranov, S P; Barashkou, A; Barbaro Galtieri, A; Barber, T; Barberio, E L; Barberis, D; Barbero, M; Bardin, D Y; Barillari, T; Barisonzi, M; Barklow, T; Barlow, N; Barnett, B M; Barnett, R M; Baroncelli, A; Barone, G; Barr, A J; Barreiro, F; Barreiro Guimarães da Costa, J; Barrillon, P; Bartoldus, R; Barton, A E; Bartsch, D; Bartsch, V; Bates, R L; Batkova, L; Batley, J R; Battaglia, A; Battistin, M; Battistoni, G; Bauer, F; Bawa, H S; Beare, B; Beau, T; Beauchemin, P H; Beccherle, R; Bechtle, P; Beck, H P; Beckingham, M; Becks, K H; Beddall, A J; Beddall, A; Bedikian, S; Bednyakov, V A; Bee, C P; Begel, M; Behar Harpaz, S; Behera, P K; Beimforde, M; Belanger-Champagne, C; Bell, P J; Bell, W H; Bella, G; Bellagamba, L; Bellina, F; Bellomo, M; Belloni, A; Beloborodova, O; Belotskiy, K; Beltramello, O; Ben Ami, S; Benary, O; Benchekroun, D; Benchouk, C; Bendel, M; Benekos, N; Benhammou, Y; Benjamin, D P; Benoit, M; Bensinger, J R; Benslama, K; Bentvelsen, S; Berge, D; Bergeaas Kuutmann, E; Berger, N; Berghaus, F; Berglund, E; Beringer, J; Bernardet, K; Bernat, P; Bernhard, R; Bernius, C; Berry, T; Bertin, A; Bertinelli, F; Bertolucci, F; Besana, M I; Besson, N; Bethke, S; Bhimji, W; Bianchi, R M; Bianco, M; Biebel, O; Bieniek, S P; Bierwagen, K; Biesiada, J; Biglietti, M; Bilokon, H; Bindi, M; Binet, S; Bingul, A; Bini, C; Biscarat, C; Bitenc, U; Black, K M; Blair, R E; Blanchard, J-B; Blanchot, G; Blazek, T; Blocker, C; Blocki, J; Blondel, A; Blum, W; Blumenschein, U; Bobbink, G J; Bobrovnikov, V B; Bocchetta, S S; Bocci, A; Boddy, C R; Boehler, M; Boek, J; Boelaert, N; Böser, S; Bogaerts, J A; Bogdanchikov, A; Bogouch, A; Bohm, C; Boisvert, V; Bold, T; Boldea, V; Bolnet, N M; Bona, M; Bondarenko, V G; Bondioli, M; Boonekamp, M; Boorman, G; Booth, C N; Bordoni, S; Borer, C; Borisov, A; Borissov, G; Borjanovic, I; Borroni, S; Bos, K; Boscherini, D; Bosman, M; Boterenbrood, H; Botterill, D; Bouchami, J; Boudreau, J; Bouhova-Thacker, E V; Bourdarios, C; Bousson, N; Boveia, A; Boyd, J; Boyko, I R; Bozhko, N I; Bozovic-Jelisavcic, I; Bracinik, J; Braem, A; Branchini, P; Brandenburg, G W; Brandt, A; Brandt, G; Brandt, O; Bratzler, U; Brau, B; Brau, J E; Braun, H M; Brelier, B; Bremer, J; Brenner, R; Bressler, S; Breton, D; Britton, D; Brochu, F M; Brock, I; Brock, R; Brodbeck, T J; Brodet, E; Broggi, F; Bromberg, C; Brooijmans, G; Brooks, W K; Brown, G; Brown, H; Bruckman de Renstrom, P A; Bruncko, D; Bruneliere, R; Brunet, S; Bruni, A; Bruni, G; Bruschi, M; Buanes, T; Bucci, F; Buchanan, J; Buchanan, N J; Buchholz, P; Buckingham, R M; Buckley, A G; Buda, S I; Budagov, I A; Budick, B; Büscher, V; Bugge, L; Buira-Clark, D; Bulekov, O; Bunse, M; Buran, T; Burckhart, H; Burdin, S; Burgess, T; Burke, S; Busato, E; Bussey, P; Buszello, C P; Butin, F; Butler, B; Butler, J M; Buttar, C M; Butterworth, J M; Buttinger, W; Byatt, T; Cabrera Urbán, S; Caforio, D; Cakir, O; Calafiura, P; Calderini, G; Calfayan, P; Calkins, R; Caloba, L P; Caloi, R; Calvet, D; Calvet, S; Camacho Toro, R; Camarri, P; Cambiaghi, M; Cameron, D; Campana, S

    2011-12-30

    This Letter reports on a search for narrow high-mass resonances decaying into dilepton final states. The data were recorded by the ATLAS experiment in pp collisions at ?s=7??TeV at the Large Hadron Collider and correspond to a total integrated luminosity of 1.08 (1.21)??fb(-1) in the e(+)e(-) (?(+)?(-)) channel. No statistically significant excess above the standard model expectation is observed and upper limits are set at the 95% C.L. on the cross section times branching fraction of Z' resonances and Randall-Sundrum gravitons decaying into dileptons as a function of the resonance mass. A lower mass limit of 1.83 TeV on the sequential standard model Z' boson is set. A Randall-Sundrum graviton with coupling k/M(Pl)=0.1 is excluded at 95% C.L. for masses below 1.63 TeV. PMID:22243306

  8. Search for Dilepton Resonances in pp Collisions at ?s=7 TeV with the ATLAS Detector

    DOE PAGESBeta

    Aad, G.; Abbott, B.; Abdallah, J.; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; Abramowicz, H.; Abreu, H.; et al

    2011-12-01

    This Letter reports on a search for narrow high-mass resonances decaying into dilepton final states. The data were recorded by the ATLAS experiment in pp collisions at ?s=7 TeV at the Large Hadron Collider and correspond to a total integrated luminosity of 1.08 (1.21) fb?¹ in the e?e? (????) channel. No statistically significant excess above the standard model expectation is observed and upper limits are set at the 95% C.L. on the cross section times branching fraction of Z' resonances and Randall-Sundrum gravitons decaying into dileptons as a function of the resonance mass. A lower mass limit of 1.83 TeVmore »on the sequential standard model Z' boson is set. A Randall-Sundrum graviton with coupling k/M¯¯¯¯Pl=0.1 is excluded at 95% C.L. for masses below 1.63 TeV.« less

  9. Search for Dilepton Resonances in pp Collisions at ?s=7 TeV with the ATLAS Detector

    DOE PAGESBeta

    Aad, G.; Abbott, B.; Abdallah, J.; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adams, D. L.; Addy, T. N.; Adelman, J.; Aderholz, M.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Akiyama, A.; Alam, M. S.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Aliyev, M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alviggi, M. G.; Amako, K.; Amaral, P.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amorós, G.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Andrieux, M-L.; Anduaga, X. S.; Angerami, A.; Anghinolfi, F.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Archambault, J. P.; Arfaoui, S.; Arguin, J-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Astvatsatourov, A.; Atoian, G.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Austin, N.; Avolio, G.; Avramidou, R.; Axen, D.; Ay, C.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Bachy, G.; Backes, M.; Backhaus, M.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barashkou, A.; Barbaro Galtieri, A.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barrillon, P.; Bartoldus, R.; Barton, A. E.; Bartsch, D.; Bartsch, V.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Battistoni, G.; Bauer, F.; Bawa, H. S.; Beare, B.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellina, F.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Ben Ami, S.; Benary, O.; Benchekroun, D.; Benchouk, C.; Bendel, M.; Benekos, N.; Benhammou, Y.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernardet, K.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertin, A.; Bertinelli, F.; Bertolucci, F.; Besana, M. I.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bitenc, U.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. B.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Böser, S.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bona, M.; Bondarenko, V. G.; Bondioli, M.; Boonekamp, M.; Boorman, G.; Booth, C. N.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borroni, S.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Botterill, D.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozhko, N. I.; Bozovic-Jelisavcic, I.; Bracinik, J.; Braem, A.; Branchini, P.; Brandenburg, G. W.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brelier, B.; Bremer, J.; Brenner, R.; Bressler, S.; Breton, D.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Brodbeck, T. J.; Brodet, E.; Broggi, F.; Bromberg, C.; Brooijmans, G.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.; Buanes, T.; Bucci, F.; Buchanan, J.; Buchanan, N. J.; Buchholz, P.

    2011-12-01

    This Letter reports on a search for narrow high-mass resonances decaying into dilepton final states. The data were recorded by the ATLAS experiment in pp collisions at ?s=7 TeV at the Large Hadron Collider and correspond to a total integrated luminosity of 1.08 (1.21) fb?¹ in the e?e? (????) channel. No statistically significant excess above the standard model expectation is observed and upper limits are set at the 95% C.L. on the cross section times branching fraction of Z' resonances and Randall-Sundrum gravitons decaying into dileptons as a function of the resonance mass. A lower mass limit of 1.83 TeV on the sequential standard model Z' boson is set. A Randall-Sundrum graviton with coupling k/M¯¯¯¯Pl=0.1 is excluded at 95% C.L. for masses below 1.63 TeV.

  10. Auger decay of the C 1s-12pi* resonance in carbon monoxide: Vibrationally and angularly resolved spectra

    Microsoft Academic Search

    E. Kukk; J. D. Bozek; W.-T. Cheng; R. F. Fink; A. A. Wills; N. Berrah

    1999-01-01

    Auger electron spectra from the decay of the nu=0, 1, and 2 levels of the C 1s-12pi* state were measured with sufficiently high electron and photon energy resolution to completely resolve the vibrational structure of the final electronic states. The results are compared with ab initio calculations with emphasis on the analysis of the spectator Auger transitions. The anisotropy parameters

  11. Search for a massive resonance decaying into a Higgs boson and a W or Z boson in hadronic final states in proton-proton collisions at sqrt(s) = 8 TeV

    E-print Network

    CMS Collaboration

    2015-01-01

    A search for a massive resonance decaying into a standard model Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7~fb$^{-1}$, collected in proton-proton collisions at a centre-of-mass energy of 8~TeV with the CMS detector at the LHC. Signal events in which the decay products of Higgs, W or Z bosons at high Lorentz boost are contained within a single reconstructed jet are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying into HW or HZ resulting in an all-jets final state, as well as the first application of jet substructure techniques to identify ${\\rm H\\to WW^*\\to 4q}$ decays at high Lorentz boost. No significant signal is observed and limits are set at the 95\\% confidence level on the production cross section of W' and Z' in a model with mass-degenerate charged and neutral spin-1 resonances. Resonance masses are excluded for W' in [1....

  12. Search for a massive resonance decaying into a Higgs boson and a W or Z boson in hadronic final states in proton-proton collisions at $\\sqrt{s}= $ 8 TeV

    E-print Network

    Khachatryan, Vardan; Tumasyan, Armen; Adam, Wolfgang; A??lar, Ece; Bergauer, Thomas; Brandstetter, Johannes; Dragicevic, Marko; Erö, Janos; Flechl, Martin; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hartl, Christian; Hörmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Knünz, Valentin; König, Axel; Krammer, Manfred; Krätschmer, Ilse; Liko, Dietrich; Mikulec, Ivan; Rabady, Dinyar; Rahbaran, Babak; Rohringer, Herbert; Schieck, Jochen; Schöfbeck, Robert; Strauss, Josef; Treberer-Treberspurg, Wolfgang; Waltenberger, Wolfgang; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Alderweireldt, Sara; Bansal, Sunil; Cornelis, Tom; De Wolf, Eddi A; Janssen, Xavier; Knutsson, Albert; Lauwers, Jasper; Luyckx, Sten; Ochesanu, Silvia; Rougny, Romain; Van De Klundert, Merijn; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Van Spilbeeck, Alex; Abu Zeid, Shimaa; Blekman, Freya; D'Hondt, Jorgen; Daci, Nadir; De Bruyn, Isabelle; Deroover, Kevin; Heracleous, Natalie; Keaveney, James; Lowette, Steven; Moreels, Lieselotte; Olbrechts, Annik; Python, Quentin; Strom, Derek; Tavernier, Stefaan; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Van Parijs, Isis; Barria, Patrizia; Caillol, Cécile; Clerbaux, Barbara; De Lentdecker, Gilles; Delannoy, Hugo; Dobur, Didar; Fasanella, Giuseppe; Favart, Laurent; Gay, Arnaud; Grebenyuk, Anastasia; Léonard, Alexandre; Mohammadi, Abdollah; Perniè, Luca; Randle-conde, Aidan; Reis, Thomas; Seva, Tomislav; Thomas, Laurent; Vander Velde, Catherine; Vanlaer, Pascal; Wang, Jian; Zenoni, Florian; Beernaert, Kelly; Benucci, Leonardo; Cimmino, Anna; Crucy, Shannon; Fagot, Alexis; Garcia, Guillaume; Gul, Muhammad; Mccartin, Joseph; Ocampo Rios, Alberto Andres; Poyraz, Deniz; Ryckbosch, Dirk; Salva Diblen, Sinem; Sigamani, Michael; Strobbe, Nadja; Thyssen, Filip; Tytgat, Michael; Van Driessche, Ward; Yazgan, Efe; Zaganidis, Nicolas; Basegmez, Suzan; Beluffi, Camille; Bondu, Olivier; Bruno, Giacomo; Castello, Roberto; Caudron, Adrien; Ceard, Ludivine; Da Silveira, Gustavo Gil; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Giammanco, Andrea; Hollar, Jonathan; Jafari, Abideh; Jez, Pavel; Komm, Matthias; Lemaitre, Vincent; Mertens, Alexandre; Nuttens, Claude; Perrini, Lucia; Pin, Arnaud; Piotrzkowski, Krzysztof; Popov, Andrey; Quertenmont, Loic; Selvaggi, Michele; Vidal Marono, Miguel; Beliy, Nikita; Caebergs, Thierry; Hammad, Gregory Habib; Aldá Júnior, Walter Luiz; Alves, Gilvan; Brito, Lucas; Correa Martins Junior, Marcos; Dos Reis Martins, Thiago; Hensel, Carsten; Mora Herrera, Clemencia; Moraes, Arthur; Pol, Maria Elena; Rebello Teles, Patricia; Belchior Batista Das Chagas, Ewerton; Carvalho, Wagner; Chinellato, Jose; Custódio, Analu; Da Costa, Eliza Melo; De Jesus Damiao, Dilson; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Huertas Guativa, Lina Milena; Malbouisson, Helena; Matos Figueiredo, Diego; Mundim, Luiz; Nogima, Helio; Prado Da Silva, Wanda Lucia; Santaolalla, Javier; Santoro, Alberto; Sznajder, Andre; Tonelli Manganote, Edmilson José; Vilela Pereira, Antonio; Ahuja, Sudha; Bernardes, Cesar Augusto; Dogra, Sunil; Tomei, Thiago; De Moraes Gregores, Eduardo; Mercadante, Pedro G; Novaes, Sergio F; Padula, Sandra; Romero Abad, David; Ruiz Vargas, José Cupertino; Aleksandrov, Aleksandar; Genchev, Vladimir; Hadjiiska, Roumyana; Iaydjiev, Plamen; Marinov, Andrey; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Vutova, Mariana; Dimitrov, Anton; Glushkov, Ivan; Litov, Leander; Pavlov, Borislav; Petkov, Peicho; Ahmad, Muhammad; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Chen, Mingshui; Cheng, Tongguang; Du, Ran; Jiang, Chun-Hua; Plestina, Roko; Romeo, Francesco; Shaheen, Sarmad Masood; Tao, Junquan; Wang, Chunjie; Wang, Zheng; Asawatangtrakuldee, Chayanit; Ban, Yong; Li, Qiang; Liu, Shuai; Mao, Yajun; Qian, Si-Jin; Wang, Dayong; Xu, Zijun; Zhang, Fengwangdong; Zhang, Linlin; Zou, Wei; Avila, Carlos; Cabrera, Andrés; Chaparro Sierra, Luisa Fernanda; Florez, Carlos; Gomez, Juan Pablo; Gomez Moreno, Bernardo; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Kovac, Marko; Brigljevic, Vuko; Kadija, Kreso; Luetic, Jelena; Sudic, Lucija; Attikis, Alexandros; Mavromanolakis, Georgios; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A; Rykaczewski, Hans; Bodlak, Martin; Finger, Miroslav; Finger Jr, Michael; Ali, Ahmed; Aly, Reham; Aly, Shereen; Elgammal, Sherif

    2015-01-01

    A search for a massive resonance decaying into a standard-model-like Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Signal events, in which the decay products of Higgs, W, or Z bosons at high Lorentz boost are contained within single reconstructed jets, are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying into HW or HZ resulting in an all-jet final state, as well as the first application of jet substructure techniques to identify $\\mathrm{ H \\to W W^* \\to 4q}$ decays at high Lorentz boost. No significant signal is observed and limits are set at 95% confidence level on the production cross section of W' and Z' in a model with mass-degenerate charged and neutral spin-1 resonances. Resonance masses are excluded for W...

  13. Search for a massive resonance decaying into a Higgs boson and a W or Z boson in hadronic final states in proton-proton collisions at sqrt(s) = 8 TeV

    E-print Network

    CMS Collaboration

    2015-06-04

    A search for a massive resonance decaying into a standard-model-like Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7 inverse femtobarns, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Signal events, in which the decay products of Higgs, W, or Z bosons at high Lorentz boost are contained within single reconstructed jets, are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying into HW or HZ resulting in an all-jet final state, as well as the first application of jet substructure techniques to identify H to WW* to 4q decays at high Lorentz boost. No significant signal is observed and limits are set at 95% confidence level on the production cross section of W' and Z' in a model with mass-degenerate charged and neutral spin-1 resonances. Resonance masses are excluded for W' in the interval [1.0, 1.6] TeV, for Z' in the intervals [1.0, 1.1] and [1.3,1.5] TeV, and for mass-degenerate W' and Z' in the interval [1.0, 1.7] TeV.

  14. Search for Resonant Pair Production of Neutral Long-Lived Particles Decaying to bb-bar in pp-bar Collisions at s?=1.96??TeV

    E-print Network

    Baringer, Philip S.; Bean, Alice; Clutter, Justace Randall; Moulik, Tania; Wilson, Graham Wallace

    2009-08-13

    We report on a first search for resonant pair production of neutral long-lived particles (NLLP) which each decay to a bb-bar pair, using 3.6??fb(?1) of data recorded with the D0 detector at the Fermilab Tevatron collider. ...

  15. Measurement of the D_s Decay Constant f_Ds and Observation of New Charm Resonances Decaying to D^(*)\\pi

    SciTech Connect

    Benitez, Jose

    2012-03-15

    The absolute branching fractions for the decays D{sub s}{sup -} {yields} {ell}{sup -}{bar {nu}}{sub {ell}} ({ell} = e, {mu}, or {tau}) are measured using a data sample corresponding to an integrated luminosity of 521 fb{sup -1} collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEPII e{sup +}e{sup -} collider at SLAC. The number of D{sub s}{sup -} mesons is determined by reconstructing the recoiling system DKX{gamma} in events of the type e{sup +}e{sup -} {yields} DKXD*{sub s}{sup -}, where D*{sub s}{sup -} {yields} D{sub s}{sup -} {gamma} and X represents additional pions from fragmentation. The D{sub s}{sup -} {yields} {ell}{sup -}{nu}{sub {ell}} events are detected by full or partial reconstruction of the recoiling system DKX{gamma}{ell}. The following results are obtained: {Beta}(D{sub s}{sup -} {yields} {mu}{sup -}{nu}) = (6.02 {+-} 0.38 {+-} 0.34) x 10{sup -3}, {Beta}(D{sub s}{sup -} {yields} {tau}{sup -}{nu}) = (5.00 {+-} 0.35 {+-} 0.49) x 10{sup -2}, and B(D{sub s}{sup -} {yields} e{sup -}{nu}) < 2.8 x 10{sup -4} at 90% C.L., where the first uncertainty is statistical and the second is systematic. The branching fraction measurements are combined to determine the D{sub s}{sup -} decay constant f{sub D{sub s}} = (258.6 {+-} 6.4 {+-} 7.5) MeV. In addition, a study has been performed of the D{sup +}{pi}{sup -}, D{sup 0}{pi}{sup +}, and D*{sup +}{pi}{sup -} systems in inclusive e{sup +}e{sup -} {yields} c{bar c} interactions in a search for excited D meson states. The dataset used consists of {approx}454 fb{sup -1}. The mass spectra for these systems show, for the first time, candidates for the radial excitations of the D{sup 0}, D*{sup 0}, and D*{sup +}, as well as the L = 2 excited states of the D{sup 0} and D{sup +}, where L is the orbital angular momentum of the quarks. Finally, a prototype of a next generation Detector of Internally Reflected Cherenkov radiation (Focusing DIRC) has been tested using a 10 GeV electron beam at SLAC. The Focusing DIRC is based on the DIRC which was used in the BABAR detector, but has new pixel photon detectors which improve the resolution on the single photon time of propagation by about an order of magnitude allowing, for the first time, to correct the chromatic smearing in the Cherenkov angle. The Focusing DIRC may be used in a future Super-B factory.

  16. Phase-space densities and effects of resonance decays in a hydrodynamic approach to heavy ion collisions

    Microsoft Academic Search

    S. V. Akkelin; Yu. M. Sinyukov

    2004-01-01

    A method allowing analysis of the overpopulation of phase space in heavy ion collisions in a model-independent way is proposed within the hydrodynamic approach. It makes it possible to extract a chemical potential of thermal pions at freeze-out, irrespective of the form of freeze-out (isothermal) hypersurface in Minkowski space and transverse flows on it. The contributions of resonance (with masses

  17. The iron complex in high mass X-ray binaries

    NASA Astrophysics Data System (ADS)

    Giménez-García, A.; Torrejón, J. M.; Martínez-Núñez, S.; Rodes-Rocas, J. J.; Bernabéu, G.

    2013-05-01

    An X-ray binary system consists of a compact object (a white dwarf, a neutron star or a black hole) accreting material from an optical companion star. The spectral type of the optical component strongly affects the mass transfer to the compact object. This is the reason why X-ray binary systems are usually divided in High Mass X-ray Binaries (companion O or B type, denoted HMXB) and Low Mass X-ray Binaries (companion type A or later). The HMXB are divided depending on the partner's luminosity class in two main groups: the Supergiant X-ray Binaries (SGXB) and Be X-ray Binaries (BeXB). We introduce the spectral characterization of a sample of 9 High Mass X-ray Binaries in the iron complex (˜ 6-7 keV). This spectral range is a fundamental tool in the study of the surrounding material of these systems. The sources have been divided into three main groups according to their current standard classification: SGXB, BeXB and ? Cassiopeae-like. The purpose of this work is to look for qualitative patterns in the iron complex, around 6-7 keV, in order to discern between current different classes that make up the group of HMXB. We find significant spectral patterns for each of the sets, reflecting differences in accretion physics thereof.

  18. Radiationless decay in the region of the 2t2g and 4eg resonances in SF6.

    PubMed

    Bolognesi, P; Kivimäki, A; O'Keeffe, P; Feyer, V; Tarantelli, F; Storchi, L; Avaldi, L

    2011-03-01

    The S 2p Auger spectrum of SF(6) has been studied in the region of the 2t(2g) and 4e(g) resonances. The partial Auger spectra due to the ionization of the 2p spin-orbit components and of a shake-up satellite state have been measured selectively by tuning the photon energy and using the Auger electron-photoelectron coincidence technique. A detailed analysis of the Auger spectrum has also been performed using the Green's function-based second-order algebraic diagrammatic construction method. PMID:21384970

  19. Transit flow models for low and high mass protostars

    E-print Network

    Combet, C; Murphy, G C

    2006-01-01

    In this work, the gas infall and the formation of outflows around low and high mass protostars are investigated. A radial self-similar approach to model the transit of the molecular gas around the central object is employed. We include gravitational and radiative fields to produce heated pressure-driven outflows with magneto-centrifugal acceleration and collimation. Outflow solutions with negligible or vanishing magnetic field are reported. They indicate that thermodynamics is a sufficient engine to generate an outflow. The magnetized solutions show dynamically significant differences in the axial region, precisely where the radial velocity and collimation are the largest. They compare quantitatively well with observations. The influence of the opacity on the transit solutions is also studied. It is found that, when dust is not the dominant coolant, such as in the primordial universe, mass infall rates have substantial larger values in the equatorial region. This suggests that star forming in a dust-free envi...

  20. Investigating high-mass star formation through maser surveys

    E-print Network

    S. P. Ellingsen; M. A. Voronkov; D. M. Cragg; A. M. Sobolev; S. L. Breen; P. D. Godfrey

    2007-05-21

    Interstellar masers are unique probes of the environments in which they arise. In studies of high-mass star formation their primary function has been as signposts of these regions and they have been used as probes of the kinematics and physical conditions in only a few sources. With a few notable exceptions, we know relatively little about the evolutionary phase the different maser species trace, nor their location with respect to other star formation tracers. While detailed studies of a small number of maser regions can reveal much about them, other information can only be obtained through large, systematic searches. In particular, such surveys are vital in efforts to determine an evolutionary sequence for the common maser species, and there is growing evidence that methanol masers may trace an earlier phase than the other common maser species of OH and water.

  1. High Mass Higgs Boson Searches at the Tevatron

    E-print Network

    Bjoern Penning

    2010-12-02

    We present results from CDF and D0 on direct searches for high mass standard model (SM) Higgs boson (H) in ppbar collisions at the Fermilab Tevatron at \\sqrt(s) = 1.96 TeV. Compared to previous Higgs boson Tevatron combinations, more data and new channels (H -> W+W- -> lnujj, H -> WW -> l+tau + X and trilepton final states) have been added. Most previously used channels have been reanalyzed to gain sensitivity. Analyzing 5.9 fb^-1 of data at CDF, and 5.4-6.7 fb^-1 at D0, the combination excludes with 95% C.L. a standard model Higgs boson in the mass range of m_H = 158-175 GeV/c2.

  2. NIR integral field spectroscopy of high mass young stellar objects

    NASA Astrophysics Data System (ADS)

    Murakawa, K.; Lumsden, S. L.; Oudmaijer, R. D.; Davies, B.; Hoare, M. G.

    2013-03-01

    We present K-band Integral Field Spectroscopy of six high mass young stellar objects (IRAS~18151-1208, AFGL~2136, S106~IRS4, V645 Cyg, IRAS~19065+0526, and G082.5682+ 00.4040) obtained using the adaptive optics assisted NIFS instrument mounted on the Gemini North telescope. The targets are chosen from the Red MSX Source survey led by University of Leeds. The data show the spectral features of Br?, H2, and gas phase CO emissions and absorptions with a spectral resolution of R ? 5500, which allow a three-dimensional spectro-astrometric analysis of the line emissions. We discuss the results of the ionized jets and winds, and rotating CO torus.

  3. Disks and flows in high-mass young stellar objects

    NASA Astrophysics Data System (ADS)

    Cesaroni, R.

    Star formation implies contraction from a large cloud to a small core. Such a contraction leads not only to an increase in the density and eventually the temperature of the cloud core, but also to flattening due to conservation of angular momentum. Although the details of this process are far from being clear, star formation seems to imply the existence of disks around newly formed stars. It is hence surprising that the observational evidence for such disks is relatively scarce and mostly limited to low-mass stars (see e.g. the beautiful example of GG Tau). Here, we present the results obtained in recent years with high angular resolution observations at centimeter and millimeter wavelengths towards high-mass star forming regions. These have revealed the existence of hot, dense cores which likely represent the sites where early type stars are born. The large distances to these regions prevent attaining linear resolutions comparable to those achieved towards low-mass stars: in spite of this difficulty, flattened structures and velocity gradients suggestive of rotation has been found also in association with massive young stellar objects (YSOs). Although these might represent circumstellar disks, stronger evidence is needed to confirm such a hypothesis. In this context, the existence of jets/outflows parallel to the axis of the suspected disks represents a strong argument in favour of the disk interpretation. Recent findings for sources such as IRAS 20126+4104 seem to confirm the disk-jet association and hence indicate that disk formation is common also in high-mass YSOs.

  4. A Survey of OH Masers Towards High Mass Protostellar Objects

    E-print Network

    K. A. Edris; G. A. Fuller; R. J . Cohen

    2007-01-23

    We present a survey of OH maser emission towards a sample of high mass protostellar objects made using the Nancay and GBT telescopes.OH maser emission was detected towards 63 objects with 36 new detections. There are 56 star-forming regions and 7 OH/IR candidates. There is no evidence that sources with OH masers have a different range of luminosities from the non-maser sources. The results of this survey are compared with previous water and class II methanol maser observations of the same objects. Some of the detected sources are only associated with OH masers and some sources are only associated with the 1720 MHz OH maser line. The velocity range of the maser emission suggests that the water maser sources may be divided into two groups. The detection rates and velocity range of the OH and Class II methanol masers support the idea that there is a spatial association of the OH and Class II methanol masers. The sources span a wide range in R, the ratio of the methanol maser peak flux to OH 1665 MHz maser peak flux, however there are only a few sources with intermediate values of R, 8masers of any species, OH, water or methanol, have redder [100um-12um] IRAS colours than those without masers. However, there is no evidence for different maser species tracing different stages in the evolution of these young high mass sources. Previous observations which have shown that the OH maser emission from similar sources traces the circumstellar disks around the objects. This combined with the sensitivity of the OH emission to the magnetic field, make the newly detected sources interesting candidates for future follow-up at high angular resolution.

  5. Search for new resonances decaying via WZ to leptons in proton-proton collisions at ?{ s} = 8TeV

    NASA Astrophysics Data System (ADS)

    Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Knutsson, A.; Luyckx, S.; Ochesanu, S.; Roland, B.; Rougny, R.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D'Hondt, J.; Daci, N.; Heracleous, N.; Keaveney, J.; Kim, T. J.; Lowette, S.; Maes, M.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Dobur, D.; Favart, L.; Gay, A. P. R.; Grebenyuk, A.; Léonard, A.; Mohammadi, A.; Perniè, L.; Reis, T.; Seva, T.; Thomas, L.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Adler, V.; Beernaert, K.; Benucci, L.; Cimmino, A.; Costantini, S.; Crucy, S.; Dildick, S.; Fagot, A.; Garcia, G.; Mccartin, J.; Ocampo Rios, A. A.; Ryckbosch, D.; Salva Diblen, S.; Sigamani, M.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Beluffi, C.; Bruno, G.; Castello, R.; Caudron, A.; Ceard, L.; Da Silveira, G. G.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Jez, P.; Komm, M.; Lemaitre, V.; Liao, J.; Nuttens, C.; Pagano, D.; Perrini, L.; Pin, A.; Piotrzkowski, K.; Popov, A.; Quertenmont, L.; Selvaggi, M.; Vidal Marono, M.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Aldá Júnior, W. L.; Alves, G. A.; Correa Martins Junior, M.; Dos Reis Martins, T.; Pol, M. E.; Carvalho, W.; Chinellato, J.; Custódio, A.; Da Costa, E. M.; De Jesus Damiao, D.; De Oliveira Martins, C.; Fonseca De Souza, S.; Malbouisson, H.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Prado Da Silva, W. L.; Santaolalla, J.; Santoro, A.; Sznajder, A.; Tonelli Manganote, E. J.; Vilela Pereira, A.; Bernardes, C. A.; Dias, F. A.; Fernandez Perez Tomei, T. R.; Gregores, E. M.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Aleksandrov, A.; Genchev, V.; Iaydjiev, P.; Marinov, A.; Piperov, S.; Rodozov, M.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Glushkov, I.; Hadjiiska, R.; Kozhuharov, V.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Chen, M.; Du, R.; Jiang, C. H.; Liang, D.; Liang, S.; Plestina, R.; Tao, J.; Wang, X.; Wang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Guo, Y.; Li, Q.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Wang, D.; Zhang, L.; Zou, W.; Avila, C.; Chaparro Sierra, L. F.; Florez, C.; Gomez, J. P.; Gomez Moreno, B.; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Kadija, K.; Luetic, J.; Mekterovic, D.; Sudic, L.; Attikis, A.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Bodlak, M.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Murumaa, M.; Raidal, M.; Tiko, A.; Eerola, P.; Fedi, G.; Voutilainen, M.; Härkönen, J.; Karimäki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Wendland, L.; Tuuva, T.; Besancon, M.; Couderc, F.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Favaro, C.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; Hamel de Monchenault, G.; Jarry, P.; Locci, E.; Malcles, J.; Rander, J.; Rosowsky, A.; Titov, M.; Baffioni, S.; Beaudette, F.; Busson, P.; Charlot, C.; Dahms, T.; Dalchenko, M.; Dobrzynski, L.; Filipovic, N.; Florent, A.; Granier de Cassagnac, R.; Mastrolorenzo, L.; Miné, P.; Mironov, C.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Paganini, P.; Salerno, R.; Sauvan, J. B.; Sirois, Y.; Veelken, C.; Yilmaz, Y.; Zabi, A.; Agram, J.-L.; Andrea, J.; Aubin, A.; Bloch, D.; Brom, J.-M.; Chabert, E. C.; Collard, C.; Conte, E.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Goetzmann, C.; Le Bihan, A.-C.; Van Hove, P.; Gadrat, S.; Beauceron, S.; Beaupere, N.; Boudoul, G.; Brochet, S.; Carrillo Montoya, C. A.; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fan, J.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Ruiz Alvarez, J. D.; Sabes, D.; Sgandurra, L.; Sordini, V.; Vander Donckt, M.; Verdier, P.; Viret, S.; Xiao, H.; Tsamalaidze, Z.; Autermann, C.; Beranek, S.; Bontenackels, M.

    2015-01-01

    A search is performed in proton-proton collisions at ?{ s} = 8 TeV for exotic particles decaying via WZ to fully leptonic final states with electrons, muons, and neutrinos. The data set corresponds to an integrated luminosity of 19.5 fb-1. No significant excess is observed above the expected standard model background. Upper bounds at 95% confidence level are set on the production cross section of a W? boson as predicted by an extended gauge model, and on the W? WZ coupling. The expected and observed mass limits for a W? boson, as predicted by this model, are 1.55 and 1.47 TeV, respectively. Stringent limits are also set in the context of low-scale technicolor models under a range of assumptions for the model parameters.

  6. Observation of a resonance in the KSp decay channel at a mass of 1765 MeV/c2

    NASA Astrophysics Data System (ADS)

    Adamovich, M. I.; Alexandrov, Y. A.; Baranov, S. P.; Barberis, D.; Beck, M.; Bérat, C.; Beusch, W.; Boss, M.; Brons, S.; Brückner, W.; Buénerd, M.; Busch, C.; Büscher, C.; Charignon, F.; Chauvin, J.; Chudakov, E. A.; Dersch, U.; Dropmann, F.; Engelfried, J.; Faller, F.; Fournier, A.; Gerassimov, S. G.; Godbersen, M.; Grafström, P.; Haller, T.; Heidrich, M.; Hubbard, E.; Hurst, R. B.; Königsmann, K.; Konorov, I.; Keller, N.; Martens, K.; Martin, P.; Masciocchi, S.; Michaels, R.; Müller, U.; Neeb, H.; Newbold, D.; Newsom, C.; Paul, S.; Pochodzalla, J.; Potashnikova, I.; Povh, B.; Ren, Z.; Rey-Campagnolle, M.; Rosner, G.; Rossi, L.; Rudolph, H.; Scheel, C.; Schmitt, L.; Siebert, H.-W.; Simon, A.; Smith, V.; Thilmann, O.; Trombini, A.; Vesin, E.; Volkemer, B.; Vorwalter, K.; Walcher, T.; Wälder, G.; Werding, R.; Wittmann, E.; Zavertyaev, M. V.

    2007-04-01

    We report on the observation of a KSp resonance signal at a mass of 1765 ± 5 MeV/ c 2, with intrinsic width ? = 108 ± 22 MeV/ c 2, produced inclusively in ?--nucleus interactions at 340 GeV/ c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region xF>0.7, in this region its production cross section rises approximately linearly with (1-xF), reaching BR(X?KSp)d?/dxF=(5.2±2.3)?b per nucleon at xF=0.8. The hard xF spectrum suggests the presence of a strong leading particle effect in the production and hence the identification as a ?*+ state. No corresponding peaks were observed in the K-p and ??± mass spectra.

  7. A comparative study of high-mass cluster forming clumps

    NASA Astrophysics Data System (ADS)

    López-Sepulcre, A.; Cesaroni, R.; Walmsley, C. M.

    2010-07-01

    Aims: We have searched for star formation activity (mainly infall and outflow signatures) in a sample of high-mass molecular clumps (M > 100 M?) in different evolutionary stages and with a wide range of surface densities, with the aim of looking for evolutionary trends and testing observationally recent theoretical models which predict the need for a minimum surface density to form high-mass stars. Methods: Our sample has been selected from single-dish 1.2 mm continuum surveys and is composed of 48 massive molecular clumps, of which 29 are IR-loud and 19 are IR-dark. Each of these has been mapped in the HCO+(1-0), HCN(1-0) and C18O(2-1) transitions with the IRAM-30 m telescope on Pico Veleta (Spain). We derive basic parameters (mass, momentum, kinetic energy) for the clumps and their associated outflows and examine the HCO+(1-0) line profiles for evidence of infall or expansion. Results: Molecular outflows have been detected in 75% of our targets from the presence of high-velocity wings in the HCO+(1-0) spectra. These are equally frequent and massive (between ~1 and ~100 M?) in IR-dark and IR-loud clumps, implying similar levels of star formation activity in both kinds of objects. A surface density threshold at ? = 0.3 g cm-2 has been found above which the outflow detection rate increases significantly and the outflows are on average more massive. The infall detection rate in our sample is low, but significantly higher in the IR-dark sub-sample. Our clump mass estimates using the mm dust emission and C18O(2-1) are sensitive to the temperature, but assuming a value of 15 K for the IR-dark sub-sample, we find evidence that C18O is depleted by a factor ~4.5. The HCO+(1-0) to HCN(1-0) integrated intensity ratios measured reveal a greater dispersion about the mean value in the IR-dark sub-sample than in the IR-loud by a factor of about 5. We find that a considerable number of IR-dark sources are self-absorbed in HCN(1-0) suggesting that radiative transport effects in the ground state transitions have an important influence on the integrated intensity ratio. Conclusions: Our results indicate that, in terms of outflow frequency and energetics, both IR-dark and IR-loud molecular clumps present equivalent signatures of star formation activity, and that the formation of high-mass stars requires sufficiently high clump surface densities. The higher infall detection rate measured for the IR-dark subsample suggests that these objects could be associated with the onset of star formation. Based on observations carried out with the IRAM 30-m telescope at Pico Veleta (Granada, Spain). IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).Appendices A and B are only available in electronic form at http://www.aanda.org

  8. B0 meson decays to ?0K*0, f0K*0, and ?-K*+, including higher K* resonances

    NASA Astrophysics Data System (ADS)

    Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Sun, L.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G.; Lynch, G.; Koch, H.; Schroeder, T.; Asgeirsson, D. J.; Hearty, C.; Mattison, T. S.; McKenna, J. A.; Khan, A.; Blinov, V. E.; Buzykaev, A. R.; Druzhinin, V. P.; Golubev, V. B.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Yushkov, A. N.; Bondioli, M.; Kirkby, D.; Lankford, A. J.; Mandelkern, M.; Stoker, D. P.; Atmacan, H.; Gary, J. W.; Liu, F.; Long, O.; Vitug, G. M.; Campagnari, C.; Hong, T. M.; Kovalskyi, D.; Richman, J. D.; West, C. A.; Eisner, A. M.; Kroseberg, J.; Lockman, W. S.; Martinez, A. J.; Schalk, T.; Schumm, B. A.; Seiden, A.; Cheng, C. H.; Doll, D. A.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Porter, F. C.; Rakitin, A. Y.; Andreassen, R.; Dubrovin, M. S.; Meadows, B. T.; Sokoloff, M. D.; Bloom, P. C.; Ford, W. T.; Gaz, A.; Nagel, M.; Nauenberg, U.; Smith, J. G.; Wagner, S. R.; Ayad, R.; Toki, W. H.; Spaan, B.; Kobel, M. J.; Schubert, K. R.; Schwierz, R.; Bernard, D.; Verderi, M.; Clark, P. J.; Playfer, S.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Munerato, M.; Negrini, M.; Piemontese, L.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Nicolaci, M.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Contri, R.; Guido, E.; Lo Vetere, M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Bhuyan, B.; Prasad, V.; Lee, C. L.; Morii, M.; Edwards, A. J.; Adametz, A.; Marks, J.; Uwer, U.; Bernlochner, F. U.; Ebert, M.; Lacker, H. M.; Lueck, T.; Dauncey, P. D.; Tibbetts, M.; Behera, P. K.; Mallik, U.; Chen, C.; Cochran, J.; Meyer, W. T.; Prell, S.; Rosenberg, E. I.; Rubin, A. E.; Gritsan, A. V.; Guo, Z. J.; Arnaud, N.; Davier, M.; Grosdidier, G.; Le Diberder, F.; Lutz, A. M.; Malaescu, B.; Roudeau, P.; Schune, M. H.; Stocchi, A.; Wormser, G.; Lange, D. J.; Wright, D. M.; Bingham, I.; Chavez, C. A.; Coleman, J. P.; Fry, J. R.; Gabathuler, E.; Hutchcroft, D. E.; Payne, D. J.; Touramanis, C.; Bevan, A. J.; Di Lodovico, F.; Sacco, R.; Sigamani, M.; Cowan, G.; Paramesvaran, S.; Brown, D. N.; Davis, C. L.; Denig, A. G.; Fritsch, M.; Gradl, W.; Hafner, A.; Prencipe, E.; Alwyn, K. E.; Bailey, D.; Barlow, R. J.; Jackson, G.; Lafferty, G. D.; Cenci, R.; Hamilton, B.; Jawahery, A.; Roberts, D. A.; Simi, G.; Dallapiccola, C.; Cowan, R.; Dujmic, D.; Sciolla, G.; Lindemann, D.; Patel, P. M.; Robertson, S. H.; Schram, M.; Biassoni, P.; Lazzaro, A.; Lombardo, V.; Neri, N.; Palombo, F.; Stracka, S.; Cremaldi, L.; Godang, R.; Kroeger, R.; Sonnek, P.; Summers, D. J.; Nguyen, X.; Taras, P.; De Nardo, G.; Monorchio, D.; Onorato, G.; Sciacca, C.; Raven, G.; Snoek, H. L.; Jessop, C. P.; Knoepfel, K. J.; LoSecco, J. M.; Wang, W. F.; Honscheid, K.; Kass, R.; Brau, J.; Frey, R.; Sinev, N. B.; Strom, D.; Torrence, E.; Feltresi, E.; Gagliardi, N.; Margoni, M.; Morandin, M.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.; Ben-Haim, E.; Bomben, M.; Bonneaud, G. R.; Briand, H.; Calderini, G.; Chauveau, J.; Hamon, O.; Leruste, Ph.; Marchiori, G.; Ocariz, J.; Sitt, S.; Biasini, M.; Manoni, E.; Pacetti, S.; Rossi, A.; Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Perez, A.; Rizzo, G.; Walsh, J. J.; Lopes Pegna, D.; Lu, C.; Olsen, J.; Smith, A. J. S.; Telnov, A. V.; Anulli, F.; Cavoto, G.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Li Gioi, L.; Mazzoni, M. A.; Piredda, G.; Bünger, C.; Grünberg, O.; Hartmann, T.; Leddig, T.; Schröder, H.; Waldi, R.; Adye, T.; Olaiya, E. O.; Wilson, F. F.; Emery, S.; Hamel de Monchenault, G.; Vasseur, G.; Yèche, Ch.; Aston, D.; Bard, D. J.; Bartoldus, R.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Field, R. C.; Franco Sevilla, M.; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P.; Hast, C.; Innes, W. R.; Kelsey, M. H.; Kim, H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Lewis, P.; Li, S.; Lindquist, B.; Luitz, S.; Luth, V.; Lynch, H. L.; MacFarlane, D. B.; Muller, D. R.; Neal, H.; Nelson, S.; Ofte, I.; Perl, M.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Santoro, V.; Schindler, R. H.; Snyder, A.; Su, D.; Sullivan, M. K.; Va'vra, J.; Wagner, A. P.; Weaver, M.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Yarritu, A. K.; Young, C. C.; Ziegler, V.; Park, W.; Purohit, M. V.; White, R. M.; Wilson, J. R.; Randle-Conde, A.; Sekula, S. J.; Bellis, M.; Benitez, J. F.; Burchat, P. R.; Miyashita, T. S.; Alam, M. S.

    2012-04-01

    We present branching fraction measurements for the decays B0??0K*0, B0?f0K*0, and B0??-K*+, where K* is an S-wave (K?)0* or a K*(892) meson; we also measure B0?f0K2*(1430)0. For the K*(892) channels, we report measurements of longitudinal polarization fractions (for ? final states) and direct CP violation asymmetries. These results are obtained from a sample of (471.0±2.8)×106 BB¯ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory. We observe ?0K*(892)0, ?0(K?)0*0, f0K*(892)0, and ?-K*(892)+ with greater than 5? significance, including systematics. We report first evidence for f0(K?)0*0 and f0K2*(1430)0, and place an upper limit on ?-(K?)0*+. Our results in the K*(892) channels are consistent with no direct CP violation.

  9. Tetraquark resonances with the triple flip-flop potential, decays in the cherry in a broken glass approximation

    E-print Network

    Bicudo, Pedro

    2010-01-01

    We develop a unitarized formalism to study tetraquarks using the triple flip-flop potential, which includes two meson-meson potentials and the tetraquark four-body potential. This can be related to the Jaffe-Wilczek and to the Karliner-Lipkin tetraquark models, where we also consider the possible open channels, since the four quarks and antiquarks may at any time escape to a pair of mesons. Here we study a simplified two-variable toy model and explore the analogy with a cherry in a glass, but a broken one where the cherry may escape from. It is quite interesting to have our system confined or compact in one variable and infinite in the other variable. In this framework we solve the two-variable Schr\\"odinger equation in configuration space. With the finite difference method, we compute the spectrum, we search for localized states and we attempt to compute phase shifts. We then apply the outgoing spherical wave method to compute in detail the phase shifts and and to determine the decay widths. We explore the m...

  10. Jets and decays of resonances: Two mechanisms responsible for reduction of elliptic flow at the CERN Large Hadron Collider (LHC) and restoration of constituent quark scaling

    SciTech Connect

    Eyyubova, G.; Bravina, L. V.; Zabrodin, E.; Korotkikh, V. L.; Lokhtin, I. P.; Malinina, L. V.; Petrushanko, S. V.; Snigirev, A. M. [Department of Physics, University of Oslo, Post Box 1048 Blindern, N-0316 Oslo (Norway); Skobeltsyn Institute of Nuclear Physics, Moscow State University, RU-119991 Moscow (Russian Federation)

    2009-12-15

    The formation and evolution of the elliptic flow pattern in Pb+Pb collisions at {radical}(s)=5.5A TeV and in Au+Au collisions at {radical}(s)=200A GeV are analyzed for different hadron species within the framework of the HYDJET++ Monte Carlo model. The model contains both hydrodynamic state and jets, thus allowing for a study of the interplay between the soft and hard processes. It is found that jets terminate the rise of the elliptic flow with increasing transverse momentum. Since jets are more influential at the Large Hadron Collider (LHC) than at the Relativistic Heavy Ion Collider (RHIC), the elliptic flow at LHC should be weaker than that at RHIC. The influence of resonance decays on particle elliptic flow is also investigated. These final state interactions enhance the low-p{sub T} part of the v{sub 2} of pions and light baryons and work toward the fulfillment of idealized constituent quark scaling.

  11. Transit flow models for low and high mass protostars

    E-print Network

    C. Combet; T. Lery; G. C. Murphy

    2005-10-09

    In this work, the gas infall and the formation of outflows around low and high mass protostars are investigated. A radial self-similar approach to model the transit of the molecular gas around the central object is employed. We include gravitational and radiative fields to produce heated pressure-driven outflows with magneto-centrifugal acceleration and collimation. Outflow solutions with negligible or vanishing magnetic field are reported. They indicate that thermodynamics is a sufficient engine to generate an outflow. The magnetized solutions show dynamically significant differences in the axial region, precisely where the radial velocity and collimation are the largest. They compare quantitatively well with observations. The influence of the opacity on the transit solutions is also studied. It is found that, when dust is not the dominant coolant, such as in the primordial universe, mass infall rates have substantial larger values in the equatorial region. This suggests that star forming in a dust-free environment should be able to accrete much more mass and become more massive than present day protostars.It is also suggested that molecular outflows may be dominated by the global transit of material around the protostar during the very early stages of star formation, especially in the case of massive or dust-free star formation.

  12. Accretion in High Mass X-ray Binaries

    NASA Astrophysics Data System (ADS)

    Okazaki, Atsuo

    2012-07-01

    High mass X-ray binaries (HMXBs) consist of a massive star and a compact object (a neutron star or black hole). There are three major subclasses of HMXBs, two of which have a supergiant as the mass donor, while the other has a Be star with a viscous decretion disk to fuel the compact object. Two subclasses with supergiants are Supergiant X-ray binaries (SGXBs) and Supergiant Fast X-ray Transients (SFXTs). SGXBs show bright, persistent X-ray emission, while SFXTs exhibit large and rapid X-ray variability. In both systems, the compact object accretes material of the strong wind from the supergiant companion. Except for complications caused by structured/clumpy winds, the accretion in these systems is basically of Bondi-Hoyle-Lyttleton type, even if the orbit is eccentric. On the other hand, in Be/X-ray binaries (BEXBs), another major subclass of HMXBs, the accretion occurs from the the Be disk, which can be tidally truncated or extended without truncation or even warped, depending on orbital parameters and the angle between Be star's spin axis and the binary orbital axis. Such a geometry/nature of the Be disk is thought to significantly affect not only the accretion rate but also the mode of accretion in BEXBs. In this talk, I will review accretion mechanisms in these HMXBs, utilizing results from numerical simulations when available.

  13. Why are AGN found in High Mass Galaxies?

    E-print Network

    Lan Wang; Guinevere Kauffmann

    2008-01-23

    We use semi-analytic models implemented in the Millennium Simulation to analyze the merging histories of dark matter haloes and of the galaxies that reside in them. We assume that supermassive black holes only exist in galaxies that have experienced at least one major merger. Only a few percent of galaxies with stellar masses less than $M_* < 10^{10} M_{\\odot}$ are predicted to have experienced a major merger and to contain a black hole. The fraction of galaxies with black holes increases very steeply at larger stellar masses. This agrees well with the observed strong mass dependence of the fraction of nearby galaxies that contain either low-luminosity (LINER-type) or higher-luminosity (Seyfert or composite-type) AGN. We then investigate when the major mergers that first create the black holes are predicted to occur. High mass galaxies are predicted to have formed their black holes at very early epochs. The majority of low mass galaxies never experience a major merger and hence do not contain a black hole, but a significant fraction of the supermassive black holes that do exist in low mass galaxies are predicted to have formed recently.

  14. Wind Absorption in High Mass X-ray Binaries

    NASA Astrophysics Data System (ADS)

    Hirsch, M.; Hell, N.; Nowak, M.; Pottschmidt, K.; Grinberg, V.; Wilms, J.; F"urst, F.; Tomsick, J.; Harrison, F.; Stern, D.

    2015-07-01

    The black hole binary Cygnus X-1 is one of the best studied wind accreting high mass X-ray binaries (HMXBs). Its soft X-ray light curve shows strong dips where clumps in the highly photoionized, focused wind of the donor star HDE 226868 pass our line of sight. Chandra HETGS observations allow for an investigation of the wind's properties. We present the evolution of Si and S K? spectra with four different dipping stages. As the inner part of the clumps is shielded from the X-rays, lower ionization stages appear during the deeper part of the dips. We also present first results from a joint XMM/NuSTAR campaign on the strongly absorbed neutron star X-ray binary IGR J16318-4848. The source has an N_{H} exceeding 10^{24} cm^{-2}. Its X-ray spectrum below 10 keV is dominated by strong fluorescent Fe K? emission, while the broad band 5-50 keV spectrum is dominated by Compton down scattering.

  15. Spitzer Observations of High-Mass Quiescent Cores in Orion

    NASA Astrophysics Data System (ADS)

    Chapman, Nicholas L.; Goldsmith, P. F.; Li, D.; Marsh, K.; Bryden, G.

    2009-01-01

    The mechanisms for high-mass star formation are believed to be different from those for low-mass stars. By studying the density and temperature structure of quiescent cores, we can place constraints on these processes. Therefore, we have an ongoing program to study massive quiescent cores in Orion (Li et al. 2003; Li et al. 2007; Velusamy et al. 2008). Here we present Spitzer MIPS SED observations of seven of these cores. The long slit of the MIPS SED, where most of the pixels are not on the core, has allowed us to separate the emission from the diffuse warm interstellar dust from the colder dust of the core. We used a modeling program, COREFIT, to combine our spectra with existing infrared, sub-millimeter, and millimeter data to derive better constraints on the temperature and density model for each core. The 50-100 micron MIPS SED band is particularly sensitive to changes in temperature, making these data important for accurate modeling. With better mass estimates for all the cores, we can examine whether these cores are gravitationally unstable (supercritical). This research was supported by the Jet Propulsion Laboratory, California Institute of Technology.

  16. Fourier transform mass spectrometry of high-mass biomolecules

    SciTech Connect

    Buchanan, M.V.; Hettich, R.L. (Oak Ridge National Lab., TN (United States))

    1993-03-01

    In this report the authors present an overview of the use of FTMS for the analysis of large biomolecules, with emphasis on recent developments in coupling ESI and MALDI with FTMS. A simple description of the principles of FTMS operation and experimental factors that are relevant to the examination of large molecules are also presented. The examples represent state-of-the-art capabilities of FTMS. On the basis of early reports, it is apparent that the applications of FTMS for the analysis of biopolymers will expand rapidly in the near future. Although many different types of mass analyzers are compatible with FAB, ESI, and MALDI, FTMS has exhibited particular potential for high sensitivity, accurate mass measurement, high-mass resolution, and structural characterization of large biopolymers. The recent results obtained with both ESI-FTMS and MALDI-FTMS are very exciting with respect to both fundamental advances in the capabilities of FTMS and potential applications in the biochemical laboratory. 63 refs., 6 figs., 1 tab.

  17. Hydrogen Fluoride in High-Mass Star-forming Regions

    E-print Network

    Emprechtinger, Martin; van der Tak, Floris F S; van der Wiel, Matthijs H D; Lis, Dariusz C; Neufeld, David; Phillips, Thomas G; Ceccarelli, Cecilia

    2012-01-01

    Hydrogen fluoride has been established to be an excellent tracer of molecular hydrogen in diffuse clouds. In denser environments, however, the HF abundance has been shown to be approximately two orders of magnitude lower. We present Herschel/HIFI observations of HF J=1-0 toward two high-mass star formation sites, NGC6334 I and AFGL 2591. In NGC6334 I the HF line is seen in absorption in foreground clouds and the source itself, while in AFGL 2591 HF is partially in emission. We find an HF abundance with respect to H2 of 1.5e-8 in the diffuse foreground clouds, whereas in the denser parts of NGC6334 I, we derive a lower limit on the HF abundance of 5e-10. Lower HF abundances in dense clouds are most likely caused by freeze out of HF molecules onto dust grains in high-density gas. In AFGL 2591, the view of the hot core is obstructed by absorption in the massive outflow, in which HF is also very abundant 3.6e-8) due to the desorption by sputtering. These observations provide further evidence that the chemistry of...

  18. HYDROGEN FLUORIDE IN HIGH-MASS STAR-FORMING REGIONS

    SciTech Connect

    Emprechtinger, M.; Monje, R. R.; Lis, D. C.; Phillips, T. G. [California Institute of Technology, Cahill Center for Astronomy and Astrophysics 301-17, Pasadena, CA 91125 (United States); Van der Tak, F. F. S.; Van der Wiel, M. H. D. [SRON Netherlands Institute for Space Research, NL-9747 AD Groningen (Netherlands); Neufeld, D. [Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States); Ceccarelli, C., E-mail: emprecht@caltech.edu [UJF-Grenoble 1/CNRS-INSU, Institut de Planetologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, F-38041 Grenoble (France)

    2012-09-10

    Hydrogen fluoride (HF) has been established to be an excellent tracer of molecular hydrogen in diffuse clouds. In denser environments, however, the HF abundance has been shown to be approximately two orders of magnitude lower. We present Herschel/HIFI observations of HF J = 1-0 toward two high-mass star formation sites, NGC 6334 I and AFGL 2591. In NGC 6334 I the HF line is seen in absorption in foreground clouds and the source itself, while in AFGL 2591 HF is partially in emission. We find an HF abundance with respect to H{sub 2} of 1.5 Multiplication-Sign 10{sup -8} in the diffuse foreground clouds, whereas in the denser parts of NGC 6334 I we derive a lower limit on the HF abundance of 5 Multiplication-Sign 10{sup -10}. Lower HF abundances in dense clouds are most likely caused by freezeout of HF molecules onto dust grains in high-density gas. In AFGL 2591, the view of the hot core is obstructed by absorption in the massive outflow, in which HF is also very abundant (3.6 Multiplication-Sign 10{sup -8}) due to the desorption by sputtering. These observations provide further evidence that the chemistry of interstellar fluorine is controlled by freezeout onto gas grains.

  19. Search for WW and WZ Resonances Decaying to Electron, Missing E{sub T}, and Two Jets in pp Collisions at {radical}(s)=1.96 TeV

    SciTech Connect

    Aaltonen, T.; Mehtala, P.; Orava, R.; Osterberg, K.; Saarikko, H.; Remortel, N. van [Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland); Adelman, J.; Brubaker, E.; Fedorko, W. T.; Grosso-Pilcher, C.; Hurwitz, M.; Ketchum, W.; Kim, Y. K.; Krop, D.; Kwang, S.; Lee, H. S.; Schmidt, M. A.; Shiraishi, S.; Shochet, M.; Tang, J. [Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)

    2010-06-18

    Using data from 2.9 fb{sup -1} of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We observed no statistically significant excess above the expected standard model background, and we set cross section limits at 95% confidence level on G* (Randall-Sundrum graviton), Z{sup '}, and W{sup '} bosons. By comparing these limits to theoretical cross sections, mass exclusion regions for the three particles are derived. The mass exclusion regions for Z{sup '} and W{sup '} are further evaluated as a function of their gauge coupling strength.

  20. Search for WW and WZ resonances decaying to electron, missing E(T), and two jets in pp collisions at square root(s) = 1.96??TeV.

    PubMed

    Aaltonen, T; Adelman, J; Alvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, J; Apresyan, A; Arisawa, T; Artikov, A; Asaadi, J; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Barria, P; Bartos, P; Bauer, G; Beauchemin, P-H; Bedeschi, F; Beecher, D; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Bridgeman, A; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, J; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Byrum, K L; Cabrera, S; Calancha, C; Camarda, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Chung, K; Chung, W H; Chung, Y S; Chwalek, T; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Compostella, G; Convery, M E; Conway, J; Corbo, M; Cordelli, M; Cox, C A; Cox, D J; Crescioli, F; Cuenca Almenar, C; Cuevas, J; Culbertson, R; Cully, J C; Dagenhart, D; d'Ascenzo, N; Datta, M; Davies, T; de Barbaro, P; De Cecco, S; Deisher, A; De Lorenzo, G; Dell'Orso, M; Deluca, C; Demortier, L; Deng, J; Deninno, M; d'Errico, M; Di Canto, A; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Dorigo, T; Dube, S; Ebina, K; Elagin, A; Erbacher, R; Errede, D; Errede, S; Ershaidat, N; Eusebi, R; Fang, H C; Farrington, S; Fedorko, W T; Feild, R G; Feindt, M; Fernandez, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Frank, M J; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; Garberson, F; Garcia, J E; Garfinkel, A F; Garosi, P; Gerberich, H; Gerdes, D; Gessler, A; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C M; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Group, R C; Grundler, U; Guimaraes da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, S R; Halkiadakis, E; Han, B-Y; Han, J Y; Happacher, F; Hara, K; Hare, D; Hare, M; Harr, R F; Hartz, M; Hatakeyama, K; Hays, C; Heck, M; Heinrich, J; Herndon, M; Heuser, J; Hewamanage, S; Hidas, D; Hill, C S; Hirschbuehl, D; Hocker, A; Hou, S; Houlden, M; Hsu, S-C; Hughes, R E; Hurwitz, M; Husemann, U; Hussein, M; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jang, D; Jayatilaka, B; Jeon, E J; Jha, M K; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Kar, D; Karchin, P E; Kato, Y; Kephart, R; Ketchum, W; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, H W; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Krumnack, N; Kruse, M; Krutelyov, V; Kuhr, T; Kulkarni, N P; Kurata, M; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, E; Lee, H S; Lee, J S; Lee, S W; Leone, S; Lewis, J D; Lin, C-J; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, C; Liu, T; Lockyer, N S; Loginov, A; Lovas, L; Lucchesi, D; Lueck, J; Lujan, P; Lukens, P; Lungu, G; Lys, J; Lysak, R; MacQueen, D; Madrak, R; Maeshima, K; Makhoul, K; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Marino, C P; Martin, A; Martin, V; Martínez, M; Martínez-Ballarín, R; Mastrandrea, P; Mathis, M; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzione, A; Mesropian, C; Miao, T; Mietlicki, D; Miladinovic, N; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyake, H; Moed, S; Moggi, N; Mondragon, M N; Moon, C S; Moore, R; Morello, M J; Morlock, J; Movilla Fernandez, P; Mülmenstädt, J; Mukherjee, A; Muller, Th; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Nett, J; Neu, C; Neubauer, M S; Neubauer, S; Nielsen, J; Nodulman, L; Norman, M; Norniella, O; Nurse, E; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Osterberg, K; Pagan Griso, S; Pagliarone, C; Palencia, E; Papadimitriou, V; Papaikonomou, A; Paramanov, A A; Parks, B; Pashapour, S; Patrick, J; Pauletta, G; Paulini, M; Paus, C; Peiffer, T; Pellett, D E; Penzo, A; Phillips, T J; Piacentino, G; Pianori, E; Pinera, L; Pitts, K; Plager, C

    2010-06-18

    Using data from 2.9??fb(-1) of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We observed no statistically significant excess above the expected standard model background, and we set cross section limits at 95% confidence level on G* (Randall-Sundrum graviton), Z', and W' bosons. By comparing these limits to theoretical cross sections, mass exclusion regions for the three particles are derived. The mass exclusion regions for Z' and W' are further evaluated as a function of their gauge coupling strength. PMID:20867293

  1. Molecular line tracers of high-mass star forming regions

    NASA Astrophysics Data System (ADS)

    Nagy, Zsofia

    2013-09-01

    High-mass stars influence their environment in different ways including feedback via their far-UV radiation and mechanical feedback via shocks and stellar winds. The penetration of FUV photons into molecular clouds creates Photon Dominated Regions (PDRs) with different chemical layers where the mainly ionized medium changes into mainly molecular. Different chemical layers in PDRs are traced by different species observable at sub-mm and far-infrared wavelengths. In this thesis we present results from two molecular line surveys. One of them is the James Clerk Maxwell Telescope (JCMT) Spectral Legacy Survey (SLS) toward the luminous (>10^7 L_Sun), massive (~10^6 M_Sun), and distant (11.4 kpc) star-forming region W49A. The SLS images a 2x2 arcminute field around W49A in the 330-373 GHz frequency range. The detected molecular lines reveal a complex chemistry and the importance of FUV-irradiation and shocks in the heating and chemistry of the region. The other line survey presented in this thesis is part of the HEXOS (Herschel observations of EXtra-Ordinary Sources) key program using the Herschel Space Observatory and is toward the nearby (~420 pc) prototypical edge-on Orion Bar PDR and the dense molecular condensation Orion S. Reactive ions, such as CH+, SH+, and CO+, detected as a part of this line survey trace the warm (~500-1000 K) surface region of PDRs. Spectroscopic data from the HIFI and PACS instruments of Herschel give constraints on the chemistry and excitation of reactive ions in these regions.

  2. Molecular line tracers of high-mass star forming regions

    NASA Astrophysics Data System (ADS)

    Nagy, Zsofia; Van der Tak, Floris; Ossenkopf, Volker; Bergin, Edwin; Black, John; Faure, Alexandre; Fuller, Gary; Gerin, Maryvonne; Goicoechea, Javier; Joblin, Christine; Le Bourlot, Jacques; Le Petit, Franck; Makai, Zoltan; Plume, Rene; Roellig, Markus; Spaans, Marco; Tolls, Volker

    2013-07-01

    High-mass stars influence their environment in different ways including feedback via their FUV radiation. The penetration of FUV photons into molecular clouds creates Photon Dominated Regions (PDRs) with different chemical layers where the mainly ionized medium changes into mainly molecular. Different chemical layers in PDRs are traced by different species observable at sub-mm and Far Infrared wavelengths. In this poster we present results from two molecular line surveys. One of them is the James Clerk Maxwell Telescope (JCMT) Spectral Legacy Survey (SLS) toward the luminous (>10^7 L_Sun), massive (~10^6 M_Sun), and distant (11.4 kpc) star-forming region W49A. The SLS images a 2x2 arcminute field toward W49A in the 330-373 GHz frequency range. The detected molecular lines reveal a complex chemistry and the importance of FUV-irradiation in the heating and chemistry of the region. The other line survey presented in the poster is part of the HEXOS (Herschel observations of EXtra-Ordinary Sources, PI: E. Bergin) key program using the Herschel Space Observatory and is toward the nearby (~420 pc) prototypical edge-on Orion Bar PDR and the dense molecular condensation Orion S. Reactive ions, such as CH+, SH+, and CO+, detected as a part of this line survey trace the warm (~500-1000 K) surface region of PDRs. Spectrally resolved HIFI and spectrally unresolved PACS spectra give constraints on the chemistry and excitation of reactive ions in these regions.

  3. Standard model high mass Higgs search at CDF

    SciTech Connect

    Lucchesi, Donatella; /INFN, Padua

    2010-01-01

    The CDF collaboration has analyzed almost 6 f b{sup -1} of data collected at the Tevatron Collider at {radical}{ovr s} = 1.96 TeV to search for Standard Model Higgs boson through the decay into W{sup +}W{sup -}*. Starting from events with two leptons, advanced analysis techniques are applied to better discriminate signal from background. The Higgs sensitivity is maximized combining together analysis that exploit different event topologies. No significant excess over the expected background is observed and data is used to set a limit in units of Standard Model expectations. The limit plays a fundamental role in the Higgs search excluding the existence of this particle with mass between 158 and 175 GeV/c{sup 2} when combined with D0, the other Tevatron experiment.

  4. GAMMA-RAY VARIABILITY FROM WIND CLUMPING IN HIGH-MASS X-RAY BINARIES This article has been downloaded from IOPscience. Please scroll down to see the full text article.

    E-print Network

    Townsend, Richard

    GAMMA-RAY VARIABILITY FROM WIND CLUMPING IN HIGH-MASS X-RAY BINARIES WITH JETS This article has Society. All rights reserved. Printed in the U.S.A. GAMMA-RAY VARIABILITY FROM WIND CLUMPING IN HIGH from the star's radiatively driven wind, producing pions that then quickly decay into gamma rays. Since

  5. Terrestrial planets in high-mass disks without gas giants

    NASA Astrophysics Data System (ADS)

    de Elía, G. C.; Guilera, O. M.; Brunini, A.

    2013-09-01

    Context. Observational and theoretical studies suggest that planetary systems consisting only of rocky planets are probably the most common in the Universe. Aims: We study the potential habitability of planets formed in high-mass disks without gas giants around solar-type stars. These systems are interesting because they are likely to harbor super-Earths or Neptune-mass planets on wide orbits, which one should be able to detect with the microlensing technique. Methods: First, a semi-analytical model was used to define the mass of the protoplanetary disks that produce Earth-like planets, super-Earths, or mini-Neptunes, but not gas giants. Using mean values for the parameters that describe a disk and its evolution, we infer that disks with masses lower than 0.15 M? are unable to form gas giants. Then, that semi-analytical model was used to describe the evolution of embryos and planetesimals during the gaseous phase for a given disk. Thus, initial conditions were obtained to perform N-body simulations of planetary accretion. We studied disks of 0.1, 0.125, and 0.15 M?. Results: All our simulations form massive planets on wide orbits. For a 0.1 M? disk, 2-3 super-Earths of 2.8 to 5.9 M? are formed between 2 and 5 AU. For disks of 0.125 and 0.15 M?, our simulations produce a 10-17.1 M? planet between 1.6 and 2.7 AU, and other super-Earths are formed in outer regions. Moreover, six planets survive in the habitable zone (HZ). These planets have masses from 1.9 to 4.7 M? and significant water contents ranging from 560 to 7482 Earth oceans, where one Earth ocean represents the amount of water on Earth's surface, which equals 2.8 × 10-4M?. Of the six planets formed in the HZ, three are water worlds with 39%-44% water by mass. These planets start the simulations beyond the snow line, which explains their high water abundances. In general terms, the smaller the mass of the planets observed on wide orbits, the higher the possibility to find water worlds in the HZ. In fact, massive planets can act as a dynamical barrier that prevents the inward diffusion of water-rich embryos located beyond the snow line. Conclusions: Systems without gas giants that harbor super-Earths or Neptune-mass planets on wide orbits around solar-type stars are of astrobiological interest. These systems are likely to harbor super-Earths in the HZ with significant water contents, which missions such as Kepler and Darwin should be able to find.

  6. THE EARLIEST STAGES OF HIGH MASS STAR FORMATION METHANOL MASER INSIGHTS , P. Andr1

    E-print Network

    De Buizer, James Michael

    THE EARLIEST STAGES OF HIGH MASS STAR FORMATION ­ METHANOL MASER INSIGHTS V. Minier1 , P. André1 (>8 M ) star formation using methanol MASERs as astronomical probes. Methanol masers can provide form. Tracers of high mass star-forming complexes in the Galactic plane: The brightest methanol masers

  7. Our Knowledge of High-Mass Star Formation at the Dawn of Herschel

    E-print Network

    Frédérique Motte; Patrick Hennebelle

    2008-06-04

    We review the theories and observations of high-mass star formation emphasizing the differences with those of low-mass star formation. We hereafter describe the progress expected to be achieved with Herschel, thanks notably to Key Programmes dedicated to the earliest phases of high-mass star formation.

  8. Theoretical analysis of direct $CP$ violation and differential decay width in $D^\\pm\\to \\pi^\\pm \\pi^+\\pi^-$ in phase space around the resonances $\\rho^0(770)$ and $f_0(500)$

    E-print Network

    Zhang, Zhen-Hua; Su, Yu-Mo; Lü, Gang; Zheng, Bo

    2015-01-01

    We perform a theoretical study on direct $CP$ violation in $D^\\pm\\to \\pi^\\pm \\pi^+\\pi^-$ in phase space around the intermediate states $\\rho^0(770)$ and $f_0(500)$. The possible interference between the amplitudes corresponding to the two resonances is taken into account, and the relative strong phase of the two amplitudes is treated as a free parameter. Our analysis shows that by properly chosen the strong phase, both the $CP$ violation strength and differential decay width accommodate to the experimental results.

  9. Theoretical analysis of direct $CP$ violation and differential decay width in $D^\\pm\\to ?^\\pm ?^+?^-$ in phase space around the resonances $?^0(770)$ and $f_0(500)$

    E-print Network

    Zhen-Hua Zhang; Ren Song; Yu-Mo Su; Gang Lü; Bo Zheng

    2015-05-29

    We perform a theoretical study on direct $CP$ violation in $D^\\pm\\to \\pi^\\pm \\pi^+\\pi^-$ in phase space around the intermediate states $\\rho^0(770)$ and $f_0(500)$. The possible interference between the amplitudes corresponding to the two resonances is taken into account, and the relative strong phase of the two amplitudes is treated as a free parameter. Our analysis shows that by properly chosen the strong phase, both the $CP$ violation strength and differential decay width accommodate to the experimental results.

  10. A search for a neutral D meson - anti-D meson mixing in the semileptonic decay of a neutral D meson decaying to a resonant Kaon in electron volts

    NASA Astrophysics Data System (ADS)

    McGee, Sean

    2002-04-01

    Using the CLEOII.V dataset, we search for evidence of D 0 - D¯0 mixing through the decay of D0 ? K* e n with the K*+/- decaying to K*+/-?K0Sp +/-?p+/-p? p+/- . A fit for wrong-sign events, D0?K*+e-n ¯ , gives an upper limit on Rmix=ND0? D¯0?K*+e -n¯ ND0?K*-e +n at a 95% C.L. of <0.86%.

  11. Non exponential decays of hadrons

    E-print Network

    Giuseppe Pagliara; Francesco Giacosa

    2011-08-13

    We analyze the survival probability of unstable particles in the context of quantum field theory. After introducing the spectral function of resonances, we show that deviations from the exponential decay law occur at short times after the creation of the unstable particle. For hadronic decays, these deviations are sizable and could lead to observable effects.

  12. Search for High-Mass States with One Lepton Plus Missing Transverse Momentum in Proton-Proton Collisions at $\\sqrt{s} with the ATLAS Detector

    SciTech Connect

    Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdelalim, Ahmed Ali; Abdesselam, Abdelouahab; Abdinov, Ovsat; Abi, Babak; Abolins, Maris; Abramowicz, Halina; Abreu, Henso; Acerbi, Emilio; Acharya, Bobby Samir; Adams, David; Addy, Tetteh; Adelman, Jahred; Aderholz, Michael; Adomeit, Stefanie; Adragna, Paolo; Adye, Tim; Aefsky, Scott; Aguilar-Saavedra, Juan Antonio; /Freiburg U. /Oklahoma U. /Barcelona, IFAE /Geneva U. /Oxford U. /Baku, Inst. Phys. /Oklahoma State U. /Michigan State U. /Tel Aviv U. /Orsay, LAL /INFN, Milan /Milan U. /INFN, Udine /ICTP, Trieste /Brookhaven /Hampton U. /Yale U. /Heidelberg, Max Planck Inst. /Munich U. /Queen Mary, U. of London /Rutherford

    2012-06-20

    The ATLAS detector is used to search for high-mass states, such as heavy charged gauge bosons (W{prime},W*), decaying to a charged lepton (electron or muon) and a neutrino. Results are presented based on the analysis of ppcollisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 36 pb{sup -1}. No excess beyond standard model expectations is observed. A W{prime} with sequential standard model couplings is excluded at 95% confidence level for masses below 1.49 TeV, and a W* (charged chiral boson) for masses below 1.35 TeV.

  13. Stau LSP Phenomenology: Two- versus Four-Body Decay Modes and Resonant Single Slepton Production at the LHC as an Example

    E-print Network

    H. K. Dreiner; S. Grab; M. K. Trenkel

    2009-01-26

    We investigate B3 mSUGRA models, where the lightest scalar tau, stau_1, is the LSP. B3 models allow for lepton number and R-parity violation; the LSP can thus decay. We assume one non-zero B3 coupling lambda'_ijk at M_GUT, which generates further B3 couplings at M_Z. We study the RGEs and give numerical examples. The new couplings lead to additional stau_1 decays, providing distinct collider signatures. We classify the stau_1 decays and describe their dependence on the mSUGRA parameters. We exploit our results for single slepton production at the LHC. As an explicit numerical example, we investigate single smuon production, focussing on like-sign dimuons in the final state. Also considered are final states with three or four muons.

  14. Characterizing molecular clouds in the earliest phases of high-mass star formation

    NASA Astrophysics Data System (ADS)

    Sanhueza Nunez, Patricio A.

    High-mass stars play a key role in the energetics and chemical evolution. of molecular clouds and galaxies. However, the mechanisms that allow. the formation of high-mass stars are far less clear than those of. their low-mass. counterparts. Most of the research on high-mass star formation has focused. on regions currently undergoing star formation. In contrast, objects. in the earlier prestellar stage have been more difficult to identify. Recently, it has been. suggested that the cold, massive, and dense Infrared Dark Clouds (IRDCs) host. the earliest stages of high-mass star formation. The chemistry of IRDCs remains poorly explored. In this dissertation, an. observational program to search for chemical. variations in IRDC clumps as a function of their age is described. An increase in N2H+ and HCO+ abundances. is found from the quiescent, cold phase to the protostellar, warmer phases, reflecting chemical. evolution. For HCO+ abundances, the observed trend is consistent with. theoretical predictions. However, chemical models fail to explain the observed. trend of increasing N2H+ abundances. Pristine high-mass prestellar clumps are ideal for testing and constraining. theories of high-mass star formation because their predictions differ. the most at the early stages of evolution. From the initial IRDC sample, a high-mass clump that is the best candidate to be in the prestellar phase. was selected (IRDC G028.23-00.19 MM1). With a new set of observations, the prestellar nature of the clump is confirmed. High-angular resolution. observations of IRDC G028.23-00.19 suggest that in. order to form high-mass stars, the detected cores have to accrete a large. amount of material, passing through a low- to intermediate-mass phase. before having the necessary mass to form a. high-mass star. The turbulent core accretion model. is inconsistent with this observational result, but on the other hand, the. observations support the competitive accretion model. Embedded cores have. to grow in. mass during the star-formation process itself; the mass is not set at early. times as the turbulent core accretion model predicts. The observed gas velocity dispersion in the cores is transonic and mildly. supersonic, resulting in low virial parameters (neglecting magnetic fields). The turbulent core accretion model assumes highly supersonic linewidths and. virial parameters sim1, inconsistent with the observations, unless. magnetic fields in the cores have strengths of the order of 1 mG.

  15. The NH3 Hyperfine Intensity Anomaly in High-Mass Star-Forming Regions

    NASA Astrophysics Data System (ADS)

    Camarata, Matthew A.; Jackson, James M.; Chambers, Edward

    2015-06-01

    Anomalous ammonia (NH3) spectra, exhibiting asymmetric hyperfine satellite intensity profiles in the (J,K) = (1, 1) inversion transition, have been observed in star-forming regions for over 35 years. We present a systematic study of this “hyperfine intensity anomaly” (HIA) toward a sample of 334 high-mass star forming regions: 310 high-mass (?100 {{M}? }) clumps and 24 infrared dark clouds. The HIA is ubiquitous in high-mass star forming regions. Although LTE excitation predicts that the intensity ratios of the outer satellites and inner satellites are exactly unity, for this sample the ensemble average ratios are 0.812 ± 0.004 and 1.125 ± 0.005, respectively. We have quantified the HIA and find no significant relationships between the HIA and temperature, line width, optical depth, and the stage of stellar evolution. The fact that HIAs are common in high-mass star-forming regions suggests that the conditions that lead to HIAs are ubiquitous in these regions. A possible link between HIAs and the predictions of the competitive accretion model of high-mass star formation is suggested; however, the expected trends of HIA strength with clump evolutionary stage, rotational temperature, and line width for evolving cores in competitive accretion models are not found. Thus, the exact gas structures that produce HIAs remain unknown. Turbulent gas structures are a possible explanation, but the details need to be explored.

  16. Resonant Higgs boson pair production in the $hh\\rightarrow b\\bar{b} \\; WW \\rightarrow b\\bar{b} \\ell^+ ?\\ell^- \\bar?$ decay channel

    E-print Network

    Victor Martin-Lozano; Jesus M. Moreno; Chan Beom Park

    2015-01-15

    Adding a scalar singlet provides one of the simplest extensions of the Standard Model. In this work we briefly review the latest constraints on the mass and mixing of the new Higgs boson and study its production and decay at the LHC. We mainly focus on double Higgs production in the $hh \\rightarrow b \\bar{b} WW \\rightarrow b \\bar{b} \\ell^+ \

  17. CAFÉ-BEANS: An exhaustive hunt for high-mass binaries

    NASA Astrophysics Data System (ADS)

    Negueruela, I.; Maíz-Apellániz, J.; Simón-Díaz, S.; Alfaro, E. J.; Herrero, A.; Alonso, J.; Barbá, R.; Lorenzo, J.; Marco, A.; Monguió, M.; Morrell, N.; Pellerin, A.; Sota, A.; Walborn, N. R.

    2015-05-01

    CAFÉ-BEANS is an on-going survey running on the 2.2 m telescope at Calar Alto. For more than two years, CAFÉ-BEANS has been collecting high-resolution spectra of early-type stars with the aim of detecting and characterising spectroscopic binaries. The main goal of this project is a thorough characterisation of multiplicity in high-mass stars by detecting all spectroscopic and visual binaries in a large sample of Galactic O-type stars, and solving their orbits. Our final objective is eliminating all biases in the high-mass-star IMF created by undetected binaries.

  18. Molecular abundance ratios as a tracer of accelerated collapse in regions of high mass star formation?

    E-print Network

    C. J. Lintott; S. Viti; J. M. C. Rawlings; D. A. Williams; T. W. Hartquist; P. Caselli; I. Zinchenko; P. Myers

    2004-10-27

    Recent observations suggest that the behaviour of tracer species such as N_2H+ and CS is significantly different in regions of high and low mass star formation. In the latter, N_2H+ is a good tracer of mass, while CS is not. Observations show the reverse to be true in high-mass star formation regions. We use a computational chemical model to show that the abundances of these and other species may be significantly altered by a period of accelerated collapse in high mass star forming regions. We suggest these results provide a potential explanation of the observations, and make predictions for the behaviour of other species.

  19. Search for W' boson resonances decaying to a top and a bottom quark and probing anomalous Wtb couplings with 1 fb{sup -1} of D0 Data

    SciTech Connect

    Badaud, Frederique [LPC, Univ Blaise Pascal, CNRS/IN2P3, Clermont (France)

    2008-11-23

    With the first evidence for single top quark production in the D0 detector at the Fermilab Tevatron pp-bar collider, the single top quark cross section is measured, limits on the masses of heavy W' boson resonances are set and anomalous Wtb couplings are studied.

  20. [MRO] Search for resonant diboson production in the WW/WZ???jj decay channels with the ATLAS detector at ?s=7??TeV

    E-print Network

    Taylor, Frank E.

    A search for resonant diboson production using a data sample corresponding to 4.7??fb[superscript -1] of integrated luminosity collected by the ATLAS experiment at the Large Hadron Collider in pp collisions at ?s=7??TeV ...

  1. Auger decay of the C 1s⁻¹2Ï{sup *} resonance in carbon monoxide: Vibrationally and angularly resolved spectra

    Microsoft Academic Search

    E. Kukk; J. D. Bozek; W. Cheng; R. F. Fink; A. A. Wills; N. Berrah

    1999-01-01

    Auger electron spectra from the decay of the ν=0, 1, and 2 levels of the C 1s⁻¹2Ï{sup *} state were measured with sufficiently high electron and photon energy resolution to completely resolve the vibrational structure of the final electronic states. The results are compared with {ital ab initio} calculations with emphasis on the analysis of the spectator Auger transitions. The

  2. The earliest phases of high-mass star formation: the NGC 6334-NGC 6357 complex

    NASA Astrophysics Data System (ADS)

    Russeil, D.; Zavagno, A.; Motte, F.; Schneider, N.; Bontemps, S.; Walsh, A. J.

    2010-06-01

    Context. Our knowledge of high-mass star formation has been mainly based on follow-up studies of bright sources found by IRAS, and has thus been incomplete for its earliest phases, which are inconspicuous at infrared wavelengths. With a new generation of powerful bolometer arrays, unbiased large-scale surveys of nearby high-mass star-forming complexes now search for the high-mass analog of low-mass cores and class 0 protostars. Aims: Following the pioneering study of Cygnus X, we investigate the star-forming region NGC 6334-NGC 6357 (~1.7 kpc). Methods: We study the complex NGC 6334-NGC 6357 in an homogeneous way following the previous work of Motte and collaborators. We used the same method to extract the densest cores which are the most likely sites for high-mass star formation. We analyzed the SIMBA/SEST 1.2 mm data presented in Munoz and coworkers, which covers all high-column density areas (A v ? 15 mag) of the NGC 6334-NGC 6357 complex and extracted dense cores following the method used for Cygnus X. We constrain the properties of the most massive dense cores (M > 100 M_?) using new molecular line observations (as SiO, N2H+,H13CO+, HCO+ (1-0) and CH3CN) with Mopra and a complete cross-correlation with infrared databases (MSX, GLIMPSE, MIPSGAL) and literature. Results: We extracted 163 massive dense cores of which 16 are more massive than 200 M_?. These high-mass dense cores have a typical FWHM size of 0.37 pc, an average mass of M ~ 600 M_?, and a volume-averaged density of ~ 1.5 × 105 cm-3. Among these massive dense cores, 6 are good candidates for hosting high-mass infrared-quiet protostars, 9 cores are classified as high-luminosity infrared protostars, and we find only one high-mass starless clump (~0.3 pc, ~ 4 × 104 cm-3) that is gravitationally bound. Conclusions: Since our sample is derived from a single molecular complex and covers every embedded phase of high-mass star formation, it provides a statistical estimate of the lifetime of massive stars. In contrast to what is found for low-mass class 0 and class I phases, the infrared-quiet protostellar phase of high-mass stars may last as long as their more well known high-luminosity infrared phase. As in Cygnus X, the statistical lifetime of high-mass protostars is shorter than found for nearby, low-mass star-forming regions which implies that high-mass pre-stellar and protostellar cores are in a dynamic state, as expected in a molecular cloud where turbulent and/or dynamical processes dominate. Based on observations made with Mopra telescope. The Mopra telescope is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.Table 1 and Appendix are only available in electronic form at http://www.aanda.orgProfiles as FITS files are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/515/A55

  3. Low-threshold absolute two-plasmon decay instability in the second harmonic electron cyclotron resonance heating experiments in toroidal devices

    NASA Astrophysics Data System (ADS)

    Popov, A. Yu; Gusakov, E. Z.

    2015-02-01

    The effect of the X-mode parametric decay into two short wavelength upper hybrid (UH) plasmons propagating in opposite directions is analyzed. Due to the huge convective power loss of both the UH plasmons along the inhomogeneity direction, the power threshold of the convective parametric decay instability (PDI), which can be excited in the presence of a monotonous density profile is derived to exceed the gyrotron power range currently available. In the presence of the magnetic island possessing the local density maximum at its O-point the daughter UH plasmons can be trapped in the radial direction that suppresses their energy loss from the decay layer in full and makes the power threshold of the convective two-plasmon PDI drastically (three orders of magnitude) lower than in the previous case. The possibility of the absolute PDI being due to the finite size of the pump beam spot is demonstrated as well. The power threshold of the absolute instability is shown to be more than two orders of magnitude lower than the threshold of the convective instability at the monotonous density profile.

  4. CDF/ANAL/TOP/PUB/11092 Forward-backward asymmetry in bb pairs at high mass

    E-print Network

    Quigg, Chris

    In recent years, measurements of the forward-backward asymmetry (AFB) of top-quark pair production by Grinstein and Murphy [6]. Cuts match our analysis cuts: b,¯b AFB(b¯b) [%] [150, 225] 2 to large mb¯b. Several theorists have computed the SM prediction for AFB(b¯b) at high mass, with varied

  5. Bound State Inequality for High Mass Exchanges in a Scalar Field Model

    E-print Network

    Stefano De Leo; Pietro Rotelli

    2008-03-03

    Ladder diagrams are relevant for the study of bound states. The condition upon the coupling strength for the existence of a bound state has been deduced in a scalar field theory for the case of low mass exchanges. We apply this approach to the case of very high mass exchanges.

  6. The Eye of the Tornado An isolated high mass protostellar object near the Galactic centre?

    E-print Network

    Burton, Michael

    The Eye of the Tornado An isolated high mass protostellar object near the Galactic centre? Michael The Tornado Nebula and its "Eye" The Tornado Nebula (G357.7-0.1) is an unusual non-thermal radio source to the Tornado, and location along its axis of symmetry, suggests a connection between the two. An understanding

  7. Observation of a resonance in the K S p decay channel at a mass of 1765?MeV\\/c 2

    Microsoft Academic Search

    M. I. Adamovich; Y. A. Alexandrov; S. P. Baranov; D. Barberis; M. Beck; C. Bérat; W. Beusch; M. Boss; S. Brons; W. Brückner; M. Buénerd; C. Busch; C. Büscher; F. Charignon; J. Chauvin; E. A. Chudakov; U. Dersch; F. Dropmann; J. Engelfried; F. Faller; A. Fournier; S. G. Gerassimov; M. Godbersen; P. Grafström; T. Haller; M. Heidrich; E. Hubbard; R. B. Hurst; K. Königsmann; I. Konorov; N. Keller; K. Martens; P. Martin; S. Masciocchi; R. Michaels; U. Müller; H. Neeb; D. Newbold; C. Newsom; S. Paul; J. Pochodzalla; I. Potashnikova; B. Povh; Z. Ren; M. Rey-Campagnolle; G. Rosner; L. Rossi; H. Rudolph; C. Scheel; L. Schmitt; H.-W. Siebert; A. Simon; V. Smith; O. Thilmann; A. Trombini; E. Vesin; B. Volkemer; K. Vorwalter; T. Walcher; G. Wälder; R. Werding; E. Wittmann; M. V. Zavertyaev

    2007-01-01

    We report on the observation of a KSp resonance signal at a mass of 1765 ± 5 MeV\\/c\\u000a 2, with intrinsic width ? = 108 ± 22 MeV\\/c\\u000a 2, produced inclusively in ?--nucleus interactions at 340 GeV\\/c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region xF>0.7, in this region its production cross section rises approximately

  8. A Submicrosecond Resonator and Receiver System for Pulsed Magnetic Resonance with Large Samples

    Microsoft Academic Search

    M. Alecci; J. A. Brivati; G. Placidi; L. Testa; D. J. Lurie; A. Sotgiu

    1998-01-01

    We describe a submicrosecond resonator and receiver system for use in pulsed magnetic resonance at 220 MHz. This new resonator and receiver system design enables a reduction of the dead time, and in principle its complete elimination. We show experimentally that the resonator and receiver system permits the detection of free induction decay signals 300 ns from the end of

  9. Petroleomics Applications of Fourier Transform Ion Cyclotron Resonance Mass Spectrometry: Crude Oil and Bitumen Analysis

    Microsoft Academic Search

    Donald Francis Smith

    2007-01-01

    The ultra-high mass resolving power and high mass accuracy of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) have been shown to be well suited for the characterization of highly complex mixtures. Petroleum mixtures, arguably the most complex on the planet, have been extensively characterized by FT-ICR MS. This new field of \\

  10. The High-mass Stellar Initial Mass Function in M31 Clusters

    NASA Astrophysics Data System (ADS)

    Weisz, Daniel R.; Johnson, L. Clifton; Foreman-Mackey, Daniel; Dolphin, Andrew E.; Beerman, Lori C.; Williams, Benjamin F.; Dalcanton, Julianne J.; Rix, Hans-Walter; Hogg, David W.; Fouesneau, Morgan; Johnson, Benjamin D.; Bell, Eric F.; Boyer, Martha L.; Gouliermis, Dimitrios; Guhathakurta, Puragra; Kalirai, Jason S.; Lewis, Alexia R.; Seth, Anil C.; Skillman, Evan D.

    2015-06-01

    We have undertaken the largest systematic study of the high-mass stellar initial mass function (IMF) to date using the optical color–magnitude diagrams (CMDs) of 85 resolved, young (4 {Myr}\\lt t\\lt 25 {Myr}), intermediate mass star clusters (103–104 M?), observed as part of the Panchromatic Hubble Andromeda Treasury program. We fit each cluster’s CMD to measure its mass function (MF) slope for stars ?2 M?. By modeling the ensemble of clusters, we find the distribution of MF slopes is best described by ? = +{1.45}-0.06+0.03 with a very small intrinsic scatter and no drastic outliers. This model allows the MF slope to depend on cluster mass, size, and age, but the data imply no significant dependencies within this regime of cluster properties. The lack of an age dependence suggests that the MF slope has not significantly evolved over the first ?25 Myr and provides direct observational evidence that the measured MF represents the IMF. Taken together, this analysis—based on an unprecedented large sample of young clusters, homogeneously constructed CMDs, well-defined selection criteria, and consistent principled modeling—implies that the high-mass IMF slope in M31 clusters is universal. The IMF has a slope (? = +{1.45}-0.06+0.03; statistical uncertainties) that is slightly steeper than the canonical Kroupa (+1.30) and Salpeter (+1.35) values, and our measurement of it represents a factor of ?20 improvement in precision over the Kroupa IMF (+1.30 ± 0.7). Using our inference model on select Milky Way (MW) and LMC high-mass IMF studies from the literature, we find {? }{MW}? +1.15+/- 0.1 and {? }{LMC}? +1.3+/- 0.1, both with intrinsic scatter of ?0.3–0.4 dex. Thus, while the high-mass IMF in the Local Group may be universal, systematics in the literature of IMF studies preclude any definitive conclusions; homogenous investigations of the high-mass IMF in the local universe are needed to overcome this limitation. Consequently, the present study represents the most robust measurement of the high-mass IMF slope to date. To facilitate practical use over the full stellar mass spectrum, we have grafted the M31 high-mass IMF slope onto widely used sub-solar mass Kroupa and Chabrier IMFs. The increased steepness in the M31 high-mass IMF slope implies that commonly used UV- and H?-based star formation rates should be increased by a factor of ?1.3–1.5 and the number of stars with masses \\gt 8 M? is ?25% fewer than expected for a Salpeter/Kroupa IMF. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program #12055.

  11. Disk mediated high-mass star formation inside a hyper-compact HII region

    NASA Astrophysics Data System (ADS)

    Guzman, Andres; Garay, Guido; Rodriguez, Luis Felipe; Contreras, Yanett

    2014-10-01

    We propose to observe using ATCA the high-mass young stellar object (HMYSO) G345.49+1.47. This source is currently the most luminous example of a high-mass young star associated with a highly collimated jet, traced by the free-free emission arising from symmetrically aligned lobes. The objective of the proposed observations is to provide a second epoch in order to measure the proper motions of the ionized lobes on a six year timescale. The G345.49+1.47 jet is unique in being associated with a photo-ionized hyper-compact HII region. The detection of proper motions will not only provide confirmation of the high-velocity of the jet, consistent with being accelerated and collimated by disk accretion onto the HMYSO, but will also provide conclusive evidence that disk accretion occurs despite the presence of a photoionized region.

  12. Urban decay

    NSDL National Science Digital Library

    Peter Van den Bossche (None; )

    2007-09-23

    Urban decay refers to a city or part of a city that cannot be repaired. This building may or may not fall under urban decay, but it is important to realize that non-living objects and structures will show signs of decay in time.

  13. EMISSION MECHANISM OF 'GREEN FUZZIES' IN HIGH-MASS STAR-FORMING REGIONS

    SciTech Connect

    Takami, Michihiro; Chen, How-Huan; Karr, Jennifer L.; Lee, Hsu-Tai [Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan (China); Lai, Shih-Ping [Department of Physics, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu 30013, Taiwan (China); Minh, Young-Chol, E-mail: hiro@asiaa.sinica.edu.tw [Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of)

    2012-03-20

    The Infrared Array Camera (IRAC) on the Spitzer Space Telescope has revealed that a number of high-mass protostars are associated with extended mid-infrared emission, particularly prominent at 4.5 {mu}m. These are called 'Green Fuzzy' emission or 'Extended Green Objects'. We present color analysis of this emission toward six nearby (d = 2-3 kpc) well-studied high-mass protostars and three candidate high-mass protostars identified with the Spitzer GLIMPSE survey. In our color-color diagrams, most of the sources show a positive correlation between the [3.6]-[4.5] and [3.5]-[5.8] colors along the extinction vector in all or part of the region. We compare the colors with those of scattered continuum associated with the low-mass protostar L 1527, modeled scattered continuum in cavities, shocked emission associated with low-mass protostars, modeled H{sub 2} emission for thermal and fluorescent cases, and modeled polycyclic aromatic hydrocarbon (PAH) emission. Of the emission mechanisms discussed above, scattered continuum provides the simplest explanation for the observed linear correlation. In this case, the color variation within each object is attributed to different foreground extinctions at different positions. Alternative possible emission mechanisms to explain this correlation may be a combination of thermal and fluorescent H{sub 2} emission in shocks, and a combination of scattered continuum and thermal H{sub 2} emission, but detailed models or spectroscopic follow-up are required to investigate this possibility further. Our color-color diagrams also show possible contributions from PAHs in two objects. However, none of our samples show clear evidence for PAH emission directly associated with the high-mass protostars, several of which should be associated with ionizing radiation. This suggests that these protostars are heavily embedded even at mid-infrared wavelengths.

  14. HIGH-MASS STAR FORMATION IN THE NEAR AND FAR 3 kpc ARMS

    Microsoft Academic Search

    J. A. Green; N. M. McClure-Griffiths; J. L. Caswell; M. A. Voronkov; S. P. Ellingsen; G. A. Fuller; L. Quinn

    2009-01-01

    We report on the presence of 6.7 GHz methanol masers, known tracers of high-mass star formation, in the 3 kpc arms of the inner Galaxy. We present 49 detections from the Methanol Multibeam Survey, the largest Galactic plane survey for 6.7 GHz methanol masers, which coincide in longitude, latitude, and velocity with the recently discovered far-side 3 kpc arm and

  15. Further properties of high-mass multijet events at the Fermilab proton-antiproton collider

    Microsoft Academic Search

    F. Abe; H. Akimoto; A. Akopian; M. G. Albrow; S. R. Amendolia; D. Amidei; J. Antos; C. Anway-Wiese; S. Aota; G. Apollinari; T. Asakawa; W. Ashmanskas; M. Atac; F. Azfar; P. Azzi-Bacchetta; N. Bacchetta; W. Badgett; S. Bagdasarov; M. W. Bailey; J. Bao; P. de Barbaro; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; E. Barzi; G. Bauer; T. Baumann; F. Bedeschi; S. Behrends; S. Belforte; G. Bellettini; J. Bellinger; D. Benjamin; J. Benlloch; J. Bensinger; D. Benton; A. Beretvas; J. P. Berge; J. Berryhill; S. Bertolucci; A. Bhatti; K. Biery; M. Binkley; D. Bisello; R. E. Blair; C. Blocker; A. Bodek; W. Bokhari; V. Bolognesi; D. Bortoletto; J. Boudreau; L. Breccia; C. Bromberg; N. Bruner; E. Buckley-Geer; H. S. Budd; K. Burkett; G. Busetto; A. Byon-Wagner; K. L. Byrum; J. Cammerata; C. Campagnari; M. Campbell; A. Caner; W. Carithers; D. Carlsmith; A. Castro; D. Cauz; Y. Cen; F. Cervelli; P. S. Chang; H. Y. Chao; J. Chapman; M.-T. Cheng; G. Chiarelli; T. Chikamatsu; C. N. Chiou; L. Christofek; S. Cihangir; A. G. Clark; M. Cobal; M. Contreras; J. Conway; J. Cooper; M. Cordelli; C. Couyoumtzelis; D. Crane; D. Cronin-Hennessy; R. Culbertson; J. D. Cunningham; T. Daniels; F. Dejongh; S. Delchamps; S. dell'agnello; M. dell'orso; R. Demina; L. Demortier; B. Denby; M. Deninno; P. F. Derwent; T. Devlin; J. R. Dittmann; S. Donati; J. Done; T. Dorigo; A. Dunn; N. Eddy; K. Einsweiler; J. E. Elias; R. Ely; E. Jr. Engels; D. Errede; S. Errede; Q. Fan; I. Fiori; B. Flaugher; G. W. Foster; M. Franklin; M. Frautschi; J. Freeman; J. Friedman; H. Frisch; T. A. Fuess; Y. Fukui; S. Funaki; G. Gagliardi; S. Galeotti; M. Gallinaro; M. Garcia-Sciveres; A. F. Garfinkel; C. Gay; S. Geer; D. W. Gerdes; P. Giannetti; N. Giokaris; P. Giromini; L. Gladney; D. Glenzinski; M. Gold; J. Gonzalez; A. Gordon; A. T. Goshaw; K. Goulianos; H. Grassmann; L. Groer; C. Grosso-Pilcher; G. Guillian; R. S. Guo; C. Haber; E. Hafen; S. R. Hahn; R. Handler; R. M. Hans; K. Hara; A. D. Hardman; B. Harral; R. M. Harris; S. A. Hauger; J. Hauser; C. Hawk; E. Hayashi; J. Heinrich; K. D. Hoffman; M. Hohlmann; C. Holck; R. Hollebeek; L. Holloway; A. Hölscher; S. Hong; G. Houk; P. Hu; B. T. Huffman; R. Hughes; J. Huston; J. Huth; J. Hylen; H. Ikeda; M. Incagli; J. Incandela; G. Introzzi; J. Iwai; Y. Iwata; H. Jensen; U. Joshi; R. W. Kadel; E. Kajfasz; H. Kambara; T. Kamon; T. Kaneko; K. Karr; H. Kasha; Y. Kato; T. A. Keaffaber; L. Keeble; K. Kelley; R. D. Kennedy; R. Kephart; P. Kesten; D. Kestenbaum; R. M. Keup; H. Keutelian; F. Keyvan; B. Kharadia; B. J. Kim; D. H. Kim; H. S. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; L. Kirsch; P. Koehn; K. Kondo; J. Konigsberg; S. Kopp; K. Kordas; A. Korytov; W. Koska; E. Kovacs; W. Kowald; M. Krasberg; J. Kroll; M. Kruse; T. Kuwabara; S. E. Kuhlmann; E. Kuns; A. T. Laasanen; N. Labanca; S. Lammel; J. I. Lamoureux; T. Lecompte; S. Leone; J. D. Lewis; P. Limon; M. Lindgren; T. M. Liss; N. Lockyer; O. Long; C. Loomis; M. Loreti; J. Lu; D. Lucchesi; P. Lukens; S. Lusin; J. Lys; K. Maeshima; A. Maghakian; P. Maksimovic; M. Mangano; J. Mansour; M. Mariotti; J. P. Marriner; A. Martin; J. A. Matthews; R. Mattingly; P. McIntyre; P. Melese; A. Menzione; E. Meschi; S. Metzler; C. Miao; T. Miao; G. Michail; R. Miller; H. Minato; S. Miscetti; M. Mishina; H. Mitsushio; T. Miyamoto; S. Miyashita; N. Moggi; Y. Morita; J. Mueller; A. Mukherjee; T. Muller; P. Murat; H. Nakada; I. Nakano; C. Nelson; D. Neuberger; C. Newman-Holmes; M. Ninomiya; L. Nodulman; S. H. Oh; K. E. Ohl; T. Ohmoto; T. Ohsugi; R. Oishi; M. Okabe; T. Okusawa; R. Oliveira; J. Olsen; C. Pagliarone; R. Paoletti; V. Papadimitriou; S. P. Pappas; A. Parri; J. Patrick; G. Pauletta; M. Paulini; A. Perazzo; L. Pescara; M. D. Peters; T. J. Phillips; G. Piacentino; M. Pillai; K. T. Pitts; R. Plunkett; L. Pondrom; J. Proudfoot; F. Ptohos; G. Punzi; K. Ragan; A. Ribon; F. Rimondi; L. Ristori; W. J. Robertson; T. Rodrigo; S. Rolli; J. Romano; L. Rosenson; R. Roser; W. K. Sakumoto; D. Saltzberg; A. Sansoni; L. Santi; H. Sato; V. Scarpine; P. Schlabach; E. E. Schmidt; M. P. Schmidt; A. Scribano; S. Segler; S. Seidel; Y. Seiya; G. Sganos; M. D. Shapiro; N. M. Shaw; Q. Shen; P. F. Shepard; M. Shimojima; M. Shochet; J. Siegrist; A. Sill; P. Sinervo; P. Singh; J. Skarha; K. Sliwa; F. D. Snider; T. Song; J. Spalding; T. Speer; P. Sphicas; F. Spinella; M. Spiropulu; L. Spiegel; L. Stanco; J. Steele; A. Stefanini; K. Strahl; J. Strait; R. Ströhmer; D. Stuart; G. Sullivan; A. Soumarokov; K. Sumorok; J. Suzuki; T. Takada; T. Takahashi; T. Takano; K. Takikawa; N. Tamura; F. Tartarelli; W. Taylor; P. K. Teng; Y. Teramoto; S. Tether; D. Theriot; T. L. Thomas; R. Thun; M. Timko; P. Tipton; A. Titov; S. Tkaczyk; D. Toback; K. Tollefson; A. Tollestrup; J. Tonnison; J. F. de Troconiz; S. Truitt; J. Tseng; N. Turini; T. Uchida; N. Uemura; F. Ukegawa; G. Unal; J. Valls; S. C. van den Brink; S. Vejcik

    1996-01-01

    The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in which events are distributed uniformly over the available multibody phase space. Multijet distributions corresponding to (4N-4) variables that span the N-body parameter space are found to

  16. A disk of dust and molecular gas around a high-mass protostar.

    PubMed

    Patel, Nimesh A; Curiel, Salvador; Sridharan, T K; Zhang, Qizhou; Hunter, Todd R; Ho, Paul T P; Torrelles, José M; Moran, James M; Gómez, José F; Anglada, Guillem

    2005-09-01

    The processes leading to the birth of low-mass stars such as our Sun have been well studied, but the formation of high-mass (over eight times the Sun's mass, M(o)) stars remains poorly understood. Recent studies suggest that high-mass stars may form through accretion of material from a circumstellar disk, in essentially the same way as low-mass stars form, rather than through the merging of several low-mass stars. There is as yet, however, no conclusive evidence. Here we report the presence of a flattened disk-like structure around a massive 15M(o) protostar in the Cepheus A region, based on observations of continuum emission from the dust and line emission from the molecular gas. The disk has a radius of about 330 astronomical units (Au) and a mass of 1 to 8 M(o). It is oriented perpendicular to, and spatially coincident with, the central embedded powerful bipolar radio jet, just as is the case with low-mass stars, from which we conclude that high-mass stars can form through accretion. PMID:16136136

  17. High Mass Star Formation. III. The Functional Form of the Submillimeter Clump Mass Function

    E-print Network

    Michael A. Reid; Christine D. Wilson

    2006-07-06

    We investigate the mass function of cold, dusty clumps in 11 low- and high-mass star-forming regions. Using a homogeneous fitting technique, we analyze the shape of each region's clump mass function and examine the commonalities among them. We find that the submillimeter continuum clump mass function in low-mass star-forming regions is typically best fit by a lognormal distribution, while that in high-mass star-forming regions is better fit by a double power law. A single power law clump mass distribution is ruled out in all cases. Fitting all of the regions with a double power law, we find the mean power law exponent at the high-mass end of each mass function is alpha_high = -2.4+/-0.1, consistent with the Salpeter result of alpha = -2.35. We find no region-to-region trend in alpha_high with the mass scale of the clumps in a given region, as characterized by their median mass. Similarly, non non-parametric tests show that the shape of the clump mass function does not change much from region to region, despite the obvious changes in the intrinsic mass scale. This result is consistent with the hypothesis that the clump mass distribution is determined by a highly stochastic process, such as turbulent fragmentation. It may also suggest that the data reduction and analysis techniques strongly affect the shape of the derived mass function.

  18. A Disk/outflow System around the High-mass Protostar IRAS 20126+4104

    NASA Astrophysics Data System (ADS)

    Zhang, Qizhou; Hunter, Todd R.; Sridharan, T. K.; Kawamura, J. H.

    1999-10-01

    We present images of a disk/outflow system around a high-mass protostar IRAS 20126+4104. In the NH3 (1,1) and (2,2) lines, we have resolved a flattened disk-like structure (6'' x 3'' or 10000 x 5000 AU). The disk rotates faster toward the center, consistent with the Keplerian motion. In the direction roughly perpendicular to the disk, there exists a warm bipolar CO (7-6) outflow and the shock excited NH3 (3,3). The CO (7-6) outflow is much more compact and appears in a different orientation from the arcminute-scale north-south flow seen in the CO (2-1). Since most of the high-mass stars are formed in cluster environment and are located at kiloparsec distances, sensitive and high resolution observations of high density and highly excited molecular transitions are crucial to pinpoint the massive objects. Designed to have those capabilities, ALMA will make a significant contribution to the understanding of the protostellar environment of high-mass stars.

  19. Searching for the fourth family quarks through anomalous decays

    NASA Astrophysics Data System (ADS)

    Sahin, M.; Sultansoy, S.; Turkoz, S.

    2010-09-01

    The flavor democracy hypothesis predicts the existence of the fourth standard model family. Because of the high masses of the fourth family quarks, their anomalous decays could be dominant if certain criteria are met. This will drastically change the search strategy at hadron colliders. We show that the fourth standard model family down quarks with masses up to 400-450 GeV can be observed (or excluded) via anomalous decays by Tevatron.

  20. The inverse resonance problem for CMV operators

    NASA Astrophysics Data System (ADS)

    Weikard, Rudi; Zinchenko, Maxim

    2010-05-01

    We consider the class of CMV operators with super-exponentially decaying Verblunsky coefficients. For these we define the concept of a resonance. Then we prove the existence of Jost solutions and a uniqueness theorem for the inverse resonance problem: given the location of all resonances, taking multiplicities into account, the Verblunsky coefficients are uniquely determined.

  1. AP-MALDI imaging of neuropeptides in mouse pituitary gland with 5 ?m spatial resolution and high mass accuracy

    Microsoft Academic Search

    Sabine Guenther; Andreas Römpp; Wolfgang Kummer; Bernhard Spengler

    2011-01-01

    MALDI MS imaging is a powerful tool to visualize the spatial distribution of endogenous biomolecules such as lipids or neuropeptides. Direct identification of analytes is often difficult due to the complexity of biological tissue samples. Today reliable analyte identification is routinely done with mass spectrometers featuring high mass resolving power, high mass accuracy and MS\\/MS capability. These mass spectrometers, however,

  2. Search for Higgs bosons and new particles decaying into two photons at sqrt(s)=183 GeV

    NASA Astrophysics Data System (ADS)

    OPAL Collaboration; Ackerstaff, K.; Alexander, G.; Allison, J.; Altekamp, N.; Anderson, K. J.; Anderson, S.; Arcelli, S.; Asai, S.; Ashby, S. F.; Axen, D.; Azuelos, G.; Ball, A. H.; Barberio, E.; Barlow, R. J.; Bartoldus, R.; Batley, J. R.; Baumann, S.; Bechtluft, J.; Behnke, T.; Bell, K. W.; Bella, G.; Bentvelsen, S.; Bethke, S.; Betts, S.; Biebel, O.; Biguzzi, A.; Bird, S. D.; Blobel, V.; Bloodworth, I. J.; Bobinski, M.; Bock, P.; Böhme, J.; Boutemeur, M.; Braibant, S.; Bright-Thomas, P.; Brown, R. M.; Burckhart, H. J.; Burgard, C.; Bürgin, R.; Capiluppi, P.; Carnegie, R. K.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlton, D. G.; Chrisman, D.; Ciocca, C.; Clarke, P. E. L.; Clay, E.; Cohen, I.; Conboy, J. E.; Cooke, O. C.; Couyoumtzelis, C.; Coxe, R. L.; Cuffiani, M.; Dado, S.; Dallavalle, G. M.; Davis, R.; de Jong, S.; del Pozo, L. A.; de Roeck, A.; Desch, K.; Dienes, B.; Dixit, M. S.; Doucet, M.; Dubbert, J.; Duchovni, E.; Duckeck, G.; Duerdoth, I. P.; Eatough, D.; Estabrooks, P. G.; Etzion, E.; Evans, H. G.; Fabbri, F.; Fanfani, A.; Fanti, M.; Faust, A. A.; Fiedler, F.; Fierro, M.; Fischer, H. M.; Fleck, I.; Folman, R.; Fürtjes, A.; Futyan, D. I.; Gagnon, P.; Gary, J. W.; Gascon, J.; Gascon-Shotkin, S. M.; Geich-Gimbel, C.; Geralis, T.; Giacomelli, G.; Giacomelli, P.; Gibson, V.; Gibson, W. R.; Gingrich, D. M.; Glenzinski, D.; Goldberg, J.; Gorn, W.; Grandi, C.; Gross, E.; Grunhaus, J.; Gruwé, M.; Hanson, G. G.; Hansroul, M.; Hapke, M.; Hargrove, C. K.; Hartmann, C.; Hauschild, M.; Hawkes, C. M.; Hawkings, R.; Hemingway, R. J.; Herndon, M.; Herten, G.; Heuer, R. D.; Hildreth, M. D.; Hill, J. C.; Hillier, S. J.; Hobson, P. R.; Hocker, A.; Homer, R. J.; Honma, A. K.; Horváth, D.; Hossain, K. R.; Howard, R.; Hüntemeyer, P.; Igo-Kemenes, P.; Imrie, D. C.; Ishii, K.; Jacob, F. R.; Jawahery, A.; Jeremie, H.; Jimack, M.; Joly, A.; Jones, C. R.; Jovanovic, P.; Junk, T. R.; Karlen, D.; Kartvelishvili, V.; Kawagoe, K.; Kawamoto, T.; Kayal, P. I.; Keeler, R. K.; Kellogg, R. G.; Kennedy, B. W.; Klier, A.; Kluth, S.; Kobayashi, T.; Kobel, M.; Koetke, D. S.; Kokott, T. P.; Kolrep, M.; Komamiya, S.; Kowalewski, R. V.; Kress, T.; Krieger, P.; von Krogh, J.; Kyberd, P.; Lafferty, G. D.; Lanske, D.; Lauber, J.; Lautenschlager, S. R.; Lawson, I.; Layter, J. G.; Lazic, D.; Lee, A. M.; Lefebvre, E.; Lellouch, D.; Letts, J.; Levinson, L.; Liebisch, R.; List, B.; Littlewood, C.; Lloyd, A. W.; Lloyd, S. L.; Loebinger, F. K.; Long, G. D.; Losty, M. J.; Ludwig, J.; Liu, D.; Macchiolo, A.; MacPherson, A.; Mannelli, M.; Marcellini, S.; Markopoulos, C.; Martin, A. J.; Martin, J. P.; Martinez, G.; Mashimo, T.; Mättig, P.; McDonald, W. J.; McKenna, J.; McKigney, E. A.; McMahon, T. J.; McPherson, R. A.; Meijers, F.; Menke, S.; Merritt, F. S.; Mes, H.; Meyer, J.; Michelini, A.; Mihara, S.; Mikenberg, G.; Miller, D. J.; Mir, R.; Mohr, W.; Montanari, A.; Mori, T.; Nagai, K.; Nakamura, I.; Neal, H. A.; Nellen, B.; Nisius, R.; O'Neale, S. W.; Oakham, F. G.; Odorici, F.; Ogren, H. O.; Oreglia, M. J.; Orito, S.; Pálinkás, J.; Pásztor, G.; Pater, J. R.; Patrick, G. N.; Patt, J.; Perez-Ochoa, R.; Petzold, S.; Pfeifenschneider, P.; Pilcher, J. E.; Pinfold, J.; Plane, D. E.; Poffenberger, P.; Poli, B.; Polok, J.; Przybycie? , M.; Rembser, C.; Rick, H.; Robertson, S.; Robins, S. A.; Rodning, N.; Roney, J. M.; Roscoe, K.; Rossi, A. M.; Rozen, Y.; Runge, K.; Runolfsson, O.; Rust, D. R.; Sachs, K.; Saeki, T.; Sahr, O.; Sang, W. M.; Sarkisyan, E. K. G.; Sbarra, C.; Schaile, A. D.; Schaile, O.; Scharf, F.; Scharff-Hansen, P.; Schieck, J.; Schmitt, B.; Schmitt, S.; Schöning, A.; Schorner, T.; Schröder, M.; Schumacher, M.; Schwick, C.; Scott, W. G.; Seuster, R.; Shears, T. G.; Shen, B. C.; Shepherd-Themistocleous, C. H.; Sherwood, P.; Siroli, G. P.; Sittler, A.; Skuja, A.; Smith, A. M.; Snow, G. A.; Sobie, R.; Söldner-Rembold, S.; Sproston, M.; Stahl, A.; Stephens, K.; Steuerer, J.; Stoll, K.; Strom, D.; Ströhmer, R.; Tafirout, R.; Talbot, S. D.; Tanaka, S.; Taras, P.; Tarem, S.; Teuscher, R.; Thiergen, M.; Thomson, M. A.; von Törne, E.; Torrence, E.; Towers, S.; Trigger, I.; Trócsányi, Z.; Tsur, E.; Turcot, A. S.; Turner-Watson, M. F.; van Kooten, R.; Vannerem, P.; Verzocchi, M.; Vikas, P.; Voss, H.; Wäckerle, F.; Wagner, A.; Ward, C. P.; Ward, D. R.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Wells, P. S.; Wermes, N.; White, J. S.; Wilson, G. W.; Wilson, J. A.; Wyatt, T. R.; Yamashita, S.; Yekutieli, G.; Zacek, V.; Zer-Zion, D.

    1998-10-01

    A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a data sample of 57.7 pb-1 collected at an average center-of-mass energy of 182.6 GeV with the OPAL detector at LEP. No evidence for contributions from non-Standard Model physics processes was observed. The observed candidates are used to place limits on B(H0-->??) assuming a Standard Model production rate for Higgs boson masses up to 92 GeV, and on the production cross section for a scalar resonance decaying into di-photons up to a mass of 170 GeV. Upper limits on the product of cross section and branching ratios, ?(e+e--->XY)xB(X-->??)xB(Y- ->ff¯), as low as 70 fb are obtained over the range 1090 GeV, independent of the nature of Y provided it decays to a fermion pair and has negligible width. Higgs scalars which couple only to gauge bosons at Standard Model strength are ruled out up to a mass of 90.0 GeV at the 95% confidence level. Limits are also placed on non-minimal Higgs sectors having triplet representations.

  3. Giant Gamow-Teller resonance in neutron-rich nuclei

    SciTech Connect

    Gaponov, Yu. V.; Lutostansky, Yu. S., E-mail: lytostansky@yandex.r [Russian Research Centre Kurchatov Institute (Russian Federation)

    2010-08-15

    The giant Gamow-Teller resonance and other branches of collective nuclear excitations are described on the basis of the theory of finite Fermi systems. A connection between the Gamow-Teller resonance and Wigner SU(4) symmetry is proven. The beta-decay strength function and processes accompanying the {beta}{sup -} decay of neutron-rich nuclei are described. The effect of the satellites of the Gamow-Teller resonance on the decay properties of neutron-rich nuclei is analyzed.

  4. Stochastic Resonance

    NASA Astrophysics Data System (ADS)

    McDonnell, Mark D.; Stocks, Nigel G.; Pearce, Charles E. M.; Abbott, Derek

    2012-10-01

    Preface; 1. Introduction and motivation; 2. Stochastic resonance: its definitions, history and debates; 3. Stochastic quantization; 4. Suprathreshold stochastic resonance: encoding; 5. Suprathreshold stochastic resonance: large N encoding; 6. Suprathreshold stochastic resonance: decoding; 7. Suprathreshold stochastic resonance: large N decoding; 8. Optimal stochastic quantization; 9. SSR, neural coding, and performance tradeoffs; 10. Stochastic resonance in the auditory system; 11. The future of stochastic resonance and suprathreshold stochastic resonance; Appendices; References; Index.

  5. Search for Lepton Flavor Violating Decays of a Heavy Neutral Particle in pp¯ Collisions at (s)=1.8 TeV

    NASA Astrophysics Data System (ADS)

    Acosta, D.; Affolder, T.; Akimoto, H.; Albrow, M. G.; Ambrose, D.; Amidei, D.; Anikeev, K.; Antos, J.; Apollinari, G.; Arisawa, T.; Artikov, A.; Asakawa, T.; Ashmanskas, W.; Azfar, F.; Azzi-Bacchetta, P.; Bacchetta, N.; Bachacou, H.; Badgett, W.; Bailey, S.; de Barbaro, P.; Barbaro-Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Baroiant, S.; Barone, M.; Bauer, G.; Bedeschi, F.; Behari, S.; Belforte, S.; Bell, W. H.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Bensinger, J.; Beretvas, A.; Berryhill, J.; Bhatti, A.; Binkley, M.; Bisello, D.; Bishai, M.; Blair, R. E.; Blocker, C.; Bloom, K.; Blumenfeld, B.; Blusk, S. R.; Bocci, A.; Bodek, A.; Bolla, G.; Bolshov, A.; Bonushkin, Y.; Bortoletto, D.; Boudreau, J.; Brandl, A.; Bromberg, C.; Brozovic, M.; Brubaker, E.; Bruner, N.; Budagov, J.; Budd, H. S.; Burkett, K.; Busetto, G.; Byrum, K. L.; Cabrera, S.; Calafiura, P.; Campbell, M.; Carithers, W.; Carlson, J.; Carlsmith, D.; Caskey, W.; Castro, A.; Cauz, D.; Cerri, A.; Cerrito, L.; Chan, A. W.; Chang, P. S.; Chang, P. T.; Chapman, J.; Chen, C.; Chen, Y. C.; Cheng, M.-T.; Chertok, M.; Chiarelli, G.; Chirikov-Zorin, I.; Chlachidze, G.; Chlebana, F.; Christofek, L.; Chu, M. L.; Chung, J. Y.; Chung, W.-H.; Chung, Y. S.; Ciobanu, C. I.; Clark, A. G.; Coca, M.; Connolly, A.; Convery, M.; Conway, J.; Cordelli, M.; Cranshaw, J.; Culbertson, R.; Dagenhart, D.; D'Auria, S.; de Cecco, S.; Dejongh, F.; dell'Agnello, S.; dell'Orso, M.; Demers, S.; Demortier, L.; Deninno, M.; Pedis, D. De; Derwent, P. F.; Devlin, T.; Dionisi, C.; Dittmann, J. R.; Dominguez, A.; Donati, S.; D'Onofrio, M.; Dorigo, T.; Eddy, N.; Einsweiler, K.; Engels, E.; Erbacher, R.; Errede, D.; Errede, S.; Eusebi, R.; Fan, Q.; Farrington, S.; Feild, R. G.; Fernandez, J. P.; Ferretti, C.; Field, R. D.; Fiori, I.; Flaugher, B.; Flores-Castillo, L. R.; Foster, G. W.; Franklin, M.; Freeman, J.; Friedman, J.; Fukui, Y.; Furic, I.; Galeotti, S.; Gallas, A.; Gallinaro, M.; Gao, T.; Garcia-Sciveres, M.; Garfinkel, A. F.; Gatti, P.; Gay, C.; Gerdes, D. W.; Gerstein, E.; Giagu, S.; Giannetti, P.; Giolo, K.; Giordani, M.; Giromini, P.; Glagolev, V.; Glenzinski, D.; Gold, M.; Goldschmidt, N.; Goldstein, J.; Gomez, G.; Goncharov, M.; Gorelov, I.; Goshaw, A. T.; Gotra, Y.; Goulianos, K.; Green, C.; Gresele, A.; Grim, G.; Grosso-Pilcher, C.; Guenther, M.; Guillian, G.; da Costa, J. Guimaraes; Haas, R. M.; Haber, C.; Hahn, S. R.; Halkiadakis, E.; Hall, C.; Handa, T.; Handler, R.; Happacher, F.; Hara, K.; Hardman, A. D.; Harris, R. M.; Hartmann, F.; Hatakeyama, K.; Hauser, J.; Heinrich, J.; Heiss, A.; Hennecke, M.; Herndon, M.; Hill, C.; Hocker, A.; Hoffman, K. D.; Hollebeek, R.; Holloway, L.; Hou, S.; Huffman, B. T.; Hughes, R.; Huston, J.; Huth, J.; Ikeda, H.; Issever, C.; Incandela, J.; Introzzi, G.; Iori, M.; Ivanov, A.; Iwai, J.; Iwata, Y.; Iyutin, B.; James, E.; Jones, M.; Joshi, U.; Kambara, H.; Kamon, T.; Kaneko, T.; Kang, J.; Unel, M. Karagoz; Karr, K.; Kartal, S.; Kasha, H.; Kato, Y.; Keaffaber, T. A.; Kelley, K.; Kelly, M.; Kennedy, R. D.; Kephart, R.; Khazins, D.; Kikuchi, T.; Kilminster, B.; Kim, B. J.; Kim, D. H.; Kim, H. S.; Kim, M. J.; Kim, S. B.; Kim, S. H.; Kim, T. H.; Kim, Y. K.; Kirby, M.; Kirk, M.; Kirsch, L.; Klimenko, S.; Koehn, P.; Kondo, K.; Konigsberg, J.; Korn, A.; Korytov, A.; Kotelnikov, K.; Kovacs, E.; Kroll, J.; Kruse, M.; Krutelyov, V.; Kuhlmann, S. E.; Kurino, K.; Kuwabara, T.; Kuznetsova, N.; Laasanen, A. T.; Lai, N.; Lami, S.; Lammel, S.; Lancaster, J.; Lannon, K.; Lancaster, M.; Lander, R.; Lath, A.; Latino, G.; Lecompte, T.; Le, Y.; Lee, J.; Lee, S. W.; Leonardo, N.; Leone, S.; Lewis, J. D.; Li, K.; Lin, C. S.; Lindgren, M.; Liss, T. M.; Liu, J. B.; Liu, T.; Liu, Y. C.; Litvintsev, D. O.; Lobban, O.; Lockyer, N. S.; Loginov, A.; Loken, J.; Loreti, M.; Lucchesi, D.; Lukens, P.; Lusin, S.; Lyons, L.; Lys, J.; Madrak, R.; Maeshima, K.; Maksimovic, P.; Malferrari, L.; Mangano, M.; Manca, G.; Mariotti, M.; Martignon, G.; Martin, M.; Martin, A.; Martin, V.; Martínez, M.; Matthews, J. A.; Mazzanti, P.; McFarland, K. S.; McIntyre, P.; Menguzzato, M.; Menzione, A.; Merkel, P.; Mesropian, C.; Meyer, A.; Miao, T.; Miller, R.; Miller, J. S.; Minato, H.; Miscetti, S.; Mishina, M.; Mitselmakher, G.; Miyazaki, Y.; Moggi, N.; Moore, E.; Moore, R.; Morita, Y.; Moulik, T.; Mulhearn, M.; Mukherjee, A.; Muller, T.; Munar, A.; Murat, P.; Murgia, S.; Nachtman, J.; Nagaslaev, V.; Nahn, S.; Nakada, H.; Nakano, I.; Napora, R.; Niell, F.; Nelson, C.; Nelson, T.; Neu, C.; Neubauer, M. S.; Neuberger, D.; Newman-Holmes, C.; Ngan, C.-Y. P.; Nigmanov, T.; Niu, H.; Nodulman, L.; Nomerotski, A.; Oh, S. H.; Oh, Y. D.; Ohmoto, T.; Ohsugi, T.; Oishi, R.; Okusawa, T.; Olsen, J.; Orejudos, W.; Pagliarone, C.; Palmonari, F.; Paoletti, R.; Papadimitriou, V.; Partos, D.; Patrick, J.; Pauletta, G.

    2003-10-01

    We report on a search for a high mass, narrow width particle that decays directly to e?, e?, or ??. We use approximately 110 pb-1 of data collected with the Collider Detector at Fermilab from 1992 to 1995. No evidence of lepton flavor violating decays is found. Limits are set on the production and decay of sneutrinos with R-parity violating interactions.

  6. SEARCH FOR IONIZED JETS TOWARD HIGH-MASS YOUNG STELLAR OBJECTS

    SciTech Connect

    Guzman, Andres E.; Garay, Guido [Departamento de Astronomia, Universidad de Chile, Camino el Observatorio 1515, Las Condes, Santiago (Chile); Brooks, Kate J.; Voronkov, Maxim A. [CSIRO Astronomy and Space Science, P.O. Box 76, Epping 1710 NSW (Australia)

    2012-07-01

    We are carrying out multi-frequency radio continuum observations, using the Australia Telescope Compact Array, to systematically search for collimated ionized jets toward high-mass young stellar objects (HMYSOs). Here we report observations at 1.4, 2.4, 4.8, and 8.6 GHz, made with angular resolutions of about 7'', 4'', 2'', and 1'', respectively, toward six objects of a sample of 33 southern HMYSOs thought to be in very early stages of evolution. The objects in the sample were selected from radio and infrared catalogs by having positive radio spectral indices and being luminous (L{sub bol} > 2 Multiplication-Sign 10{sup 4} L{sub Sun }), but underluminous in radio emission compared with that expected from its bolometric luminosity. This criterion makes the radio sources good candidates for being ionized jets. As part of this systematic search, two ionized jets have been discovered: one previously published and the other reported here. The rest of the observed candidates correspond to three hypercompact H II regions and two ultracompact H II regions. The two jets discovered are associated with two of the most luminous (7 Multiplication-Sign 10{sup 4} and 1.0 Multiplication-Sign 10{sup 5} L{sub Sun }) HMYSOs known to harbor this type of object, showing that the phenomena of collimated ionized winds appear in the formation process of stars at least up to masses of {approx}20 M{sub Sun} and provide strong evidence for a disk-mediated accretion scenario for the formation of high-mass stars. From the incidence of jets in our sample, we estimate that the jet phase in high-mass protostars lasts for {approx}4 Multiplication-Sign 10{sup 4} yr.

  7. Hadronic decays

    E-print Network

    C. Michael

    2005-09-09

    Hadronic decays and transitions are a key ingredient of hadronic physics. I discuss how hadronic decays can be explored in lattice gauge theory and review studies undertaken. I also discuss the impact of decays on masses and how lattice studies can explore the nature of a hadronic state: namely whether it is a molecular or quark-antiquark state. A brief discussion of lattice exploration of pentaquark states is presented.

  8. Filaments, ridges and a mini-starburst - HOBYS' view of high mass star formation with Herschel

    NASA Astrophysics Data System (ADS)

    Hill, T.; Motte, F.; Didelon, P.

    2012-03-01

    With its unprecedented spatial resolution and high sensitivity, Herschel is revolutionising our understanding of high mass star formation and the interstellar medium (ISM). In particular, Herschel is unveiling the filamentary structure and molecular cloud constituents of the ISM where star formation takes place. The Herschel Imaging Survey of OB Young Stellar objects (HOBYS; Motte, Zavagno, Bontemps, see http://www.herschel.fr/cea/hobys/en/index.php) key program targets burgeoning young stellar objects with the aim of characterising them and the environments in which they form. HOBYS has already proven fruitful with many clear examples of high-mass star formation in nearby molecular cloud complexes (e.g. Motte et al., 2010). Through multi-wavelength Herschel observations I will introduce select regions of the HOBYS program, including Vela C, M16 and W48 to start. These data are rich with filamentary structures and a wealth of sources which span a large mass range including, low, intermediate and high-mass objects in the pre-collapse or protostellar phase of formation, many of which will proceed to form stars. The natal filaments themselves come in many shapes and sizes, they can form thick ridge-like structures, be dispersed in low column density regions or cluster in higher density regions. In Vela C, high-mass star formation proceeds preferentially in high column density supercritical filaments, called ridges, which may result from the constructive convergence of flows (Hill et al., 2011). I will present other examples of ridges identified in HOBYS regions. In addition, I will present the latest results on the Eagle Nebula (M16). This region was made iconic by Hubble, but only Herschel can trace the cold, dense early prestellar phases of star formation, and their natal interstellar filaments, in this infamous star-forming complex. The cavity ionised by the nearby OB cluster in M16 serves to heat the Pillars of Creation and the surrounding interstellar filaments. We draw hypotheses regarding the long, cold resilient (enduring) filament in the eastern portion of M16, offset from the ionised cavity. In W48, the IRDC G035.39-00.33 is likely undergoing a mini star-burst of star formation (Nuygen-Luong et al., 2011).

  9. High-mass White Dwarfs and the Energy Budget of Common Envelope Evolution

    NASA Astrophysics Data System (ADS)

    Rebassa-Mansergas, A.; Schreiber, M. R.; Zorotovic, M.; Gänsicke, B. T.

    2013-01-01

    Common envelope is the most important evolutionary process in the formation of all close compact binaries. It is well known that during the common envelope phase a fraction of the orbital energy is used to expel the envelope. However, it is not clear yet whether or not additional energy sources, such as the recombination energy of the envelope, play a decisive role. Here we demonstrate that recombination energy can only be considered as important if close binaries containing high-mass white dwarfs (Mwd ? 0.8M?) at relatively long orbital periods (Porb ? 1-3 days) exist.

  10. Nuclear Decay

    NSDL National Science Digital Library

    John Pratte

    This lesson provides an overview of basic atomic structure and the concept of radioactive decay. Topics include the particles that make up an atom, binding forces, and the concept of isotopes. There is also discussion of decay methods and half-life versus activity. The lesson includes an activity in which students use online applets to investigate the half-life and activity of selected isotopes and to examine possible decay chains for some others. They will also use a pair of dice to simulate the process of decay.

  11. Exclusive radiative penguin decays of B mesons at BaBar

    NASA Astrophysics Data System (ADS)

    Sekula, Stephen

    2007-04-01

    We present recent experimental studies of b ->s ? and b ->d ? transitions with the BaBar detector at the SLAC PEP-II B Factory. These decays proceed through loop topologies at leading order and provide a probe of New Physics at high mass scales. Contributions from virtual new particles may alter the decay rate, CP asymmetry and other observable quantities. The focus of this talk are measurements of B decays to K^*?, ??, and ?? final states.

  12. Spectrometers for Beta Decay Electrons

    NASA Astrophysics Data System (ADS)

    Jiang, Yong; Hirshfield, Jay

    2015-04-01

    Inspired by the neutrino mass direct measurement experiment Project 8, precision spectrometers are proposed to simultaneously measure energy and momentum of beta-decay electrons produced in rare nuclear events with improved energy resolution. For detecting single beta decay electrons near the end-point from a gaseous source such as tritium, one type of spectrometer is proposed to utilize stimulated cyclotron resonance interaction of microwaves with electrons in a waveguide immersed in a magnetic mirror. In the external RF fields, on-resonance electrons will satisfy both the cyclotron resonance condition and waveguide dispersion relationship. By correlating the resonances at two waveguide modes, one can associate the frequencies with both the energy and longitudinal momentum of an on-resonance electron to account for the Doppler shifts. For detecting neutrino-less double-beta decay, another spectrometer is proposed with thin foil of double-beta-allowed material immersed in a magnetic field, and RF antenna array for detection of synchrotron radiation from electrons. It utilizes the correlation between the antenna signals including higher harmonics of radiation to reconstruct the total energy distribution.

  13. Electromagnetic production of hyperon resonances

    E-print Network

    K. Hicks; D. Keller; W. Tang

    2010-12-14

    The study of hyperon resonances has entered a new era of precision with advent of high-statistics photoproduction data from the CLAS detector at Jefferson Lab. These data have multi-particle final states, allowing clean identification of exclusive reactions associated with strange mesons and baryons. Examples of physics results are: evidence for isospin interference in the decay of the $\\Lambda(1405)$ resonance; a strong suggestion of meson cloud effects in the structure of the $\\Sigma(1385)$ resonance; data from $K^*$ photoproduction that will test the existence of the purported $K_0(800)$ meson. Properties of other hyperon resonances will also be studied in the near future.

  14. Atomic physics searches for bound state beta decay

    SciTech Connect

    Murnick, D.E.; Kwon, N. (Department of Physics, Rutgers University Newark, New Jersey 07102 (United States))

    1991-08-05

    Proposed experiments to detect bound state {beta} decay are discussed. This process, although theoretically expected to occur, has not yet been observed. One experiment involves the resonance fluroescence detection of neutral {sup 3}He after the decay of tritium. A second experiment involves storage of {sup 163}Dy{sup 66+} which sould decay to {sup 163}Ho{sup 66+}.

  15. Suppressed Charmed B Decay

    SciTech Connect

    Snoek, Hella Leonie; /Vrije U., Amsterdam

    2011-11-28

    This thesis describes the measurement of the branching fractions of the suppressed charmed B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decays and the non-resonant B{sup 0} {yields} D{sup (*)-} {eta}{pi}{sup +} decays in approximately 230 million {Upsilon}(4S) {yields} B{bar B} events. The data have been collected with the BABAR detector at the PEP-II B factory at the Stanford Linear Accelerator Center in California. Theoretical predictions of the branching fraction of the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decays show large QCD model dependent uncertainties. Non-factorizing terms, in the naive factorization model, that can be calculated by QCD factorizing models have a large impact on the branching fraction of these decay modes. The predictions of the branching fractions are of the order of 10{sup -6}. The measurement of the branching fraction gives more insight into the theoretical models. In general a better understanding of QCD models will be necessary to conduct weak interaction physics at the next level. The presence of CP violation in electroweak interactions allows the differentiation between matter and antimatter in the laws of physics. In the Standard Model, CP violation is incorporated in the CKM matrix that describes the weak interaction between quarks. Relations amongst the CKM matrix elements are used to present the two relevant parameters as the apex of a triangle (Unitarity Triangle) in a complex plane. The over-constraining of the CKM triangle by experimental measurements is an important test of the Standard Model. At this moment no stringent direct measurements of the CKM angle {gamma}, one of the interior angles of the Unitarity Triangle, are available. The measurement of the angle {gamma} can be performed using the decays of neutral B mesons. The B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay is sensitive to the angle {gamma} and, in comparison to the current decays that are being employed, could significantly enhance the measurement of this angle. However, the low expected branching fraction for the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay channels could severely impact the measurement. A prerequisite of the measurement of the CKM angle is the observation of the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay on which this thesis reports. The BABAR experiment consists of the BABAR detector and the PEP-II e{sup +}e{sup -} collider. The design of the experiment has been optimized for the study of CP violation in the decays of neutral B mesons but is also highly suitable for the search for rare B decays such as the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay. The PEP-II collider operates at the {Upsilon}(4S) resonance and is a clean source of B{bar B} meson pairs.

  16. Low virial parameters in molecular clouds: Implications for high-mass star formation and magnetic fields

    SciTech Connect

    Kauffmann, Jens; Pillai, Thushara [Astronomy Department, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Goldsmith, Paul F., E-mail: jens.kauffmann@astro.caltech.edu, E-mail: tpillai@astro.caltech.edu [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Boulevard, Pasadena, CA 91109 (United States)

    2013-12-20

    Whether or not molecular clouds and embedded cloud fragments are stable against collapse is of utmost importance for the study of the star formation process. Only 'supercritical' cloud fragments are able to collapse and form stars. The virial parameter ? = M {sub vir}/M, which compares the virial mass to the actual mass, provides one way to gauge stability against collapse. Supercritical cloud fragments are characterized by ? ? 2, as indicated by a comprehensive stability analysis considering perturbations in pressure and density gradients. Past research has suggested that virial parameters ? ? 2 prevail in clouds. This would suggest that collapse toward star formation is a gradual and relatively slow process and that magnetic fields are not needed to explain the observed cloud structure. Here, we review a range of very recent observational studies that derive virial parameters <<2 and compile a catalog of 1325 virial parameter estimates. Low values of ? are in particular observed for regions of high-mass star formation (HMSF). These observations may argue for a more rapid and violent evolution during collapse. This would enable 'competitive accretion' in HMSF, constrain some models of 'monolithic collapse', and might explain the absence of high-mass starless cores. Alternatively, the data could point at the presence of significant magnetic fields ?1 mG at high gas densities. We examine to what extent the derived observational properties might be biased by observational or theoretical uncertainties. For a wide range of reasonable parameters, our conclusions appear to be robust with respect to such biases.

  17. High Mass X-ray Binaries in Nearby Star-forming Galaxies

    NASA Astrophysics Data System (ADS)

    Rangelov, Blagoy

    High Mass X-ray Binaries (HMXBs), in which a compact object, either black hole or neutron star, is accreting material from a young, massive donor star, often dominate the high-energy emission from nearby star-forming galaxies. These high mass pairs are believed to form in star clusters, where most massive star formation takes place, but to become displaced from their parent clusters either because they are dynamically ejected or because their parent cluster has dissolved. We have conducted a systematic study of the formation and evolution of bright HMXBs in eight nearby galaxies, by detecting HMXBs from their X-ray emission in Chandra X-ray Observatory observations, and identifying their parent clusters and donor stars in optical observations taken with the Hubble Space Telescope. We use the X-ray and optical properties of these systems to determine the ages of the binaries, whether the compact objects are black holes or neutron stars, and to constrain the masses of the donor stars.

  18. Ultra-high-mass mass spectrometry with charge discrimination using cryogenic detectors

    DOEpatents

    Frank, Matthias (Berkeley, CA); Mears, Carl A. (Oakland, CA); Labov, Simon E. (Berkeley, CA); Benner, W. Henry (Danville, CA)

    1999-01-01

    An ultra-high-mass time-of-flight mass spectrometer using a cryogenic particle detector as an ion detector with charge discriminating capabilities. Cryogenic detectors have the potential for significantly improving the performance and sensitivity of time-of-flight mass spectrometers, and compared to ion multipliers they exhibit superior sensitivity for high-mass, slow-moving macromolecular ions and can be used as "stop" detectors in time-of-flight applications. In addition, their energy resolving capability can be used to measure the charge state of the ions. Charge discrimination is very valuable in all time-of-flight mass spectrometers. Using a cryogenically-cooled Nb-Al.sub.2 O.sub.3 -Nb superconductor-insulator-superconductor (SIS) tunnel junction (STJ) detector operating at 1.3 K as an ion detector in a time-of-flight mass spectrometer for large biomolecules it was found that the STJ detector has charge discrimination capabilities. Since the cryogenic STJ detector responds to ion energy and does not rely on secondary electron production, as in the conventionally used microchannel plate (MCP) detectors, the cryogenic detector therefore detects large molecular ions with a velocity-independent efficiency approaching 100%.

  19. BIMA Observations of Early Stages of High-Mass Star Formation

    NASA Astrophysics Data System (ADS)

    Wyrowski, Friedrich; Sridharan, T. K.; Menten, Karl M.; Schilke, Peter

    1999-10-01

    To systematically search for high mass protostars without any free-free emission, meaning that no UC HII has formed yet, we studied 70 candidate sources, selected according to their FIR radiation characteristics and their non-detection in Galaxy wide cm continuum surveys (Ramesh & Sridharan 1997), in the water vapor and ammonia lines with the 100 m and, in case of detections, with the 30 m telescope (Menten et al. 1999; Sridharan et al. 1999). This lead to the detection of several new water masers, ubiquitous outflow activity, and several new hot core sources as evident from bright CH3CN emission. As a follow up we started interferometric observations of selected sources using the BIMA array. Here we present observations of IRAS 18089-1732, a source at a distance of 3.6 kpc with about 4 x 104 solar luminosities derived from the IRAS fluxes. The massive core is seen in 3 mm dust continuum emission and is associated with compact (~ 0.03 pc) and hot (T ~ 100 K) strong line emission of CH3CN suggesting an enhancement and heating of this molecule through very recent evaporation of dust grains by a newly born high mass (proto) star.

  20. DECAY AND NON-DECAY OF THE LOCAL ENERGY FOR THE WAVE EQUATION ON THE DE SITTERSCHWARZSCHILD METRIC

    E-print Network

    Boyer, Edmond

    DECAY AND NON-DECAY OF THE LOCAL ENERGY FOR THE WAVE EQUATION ON THE DE SITTER­SCHWARZSCHILD METRIC equation on the De Sitter­ Schwarzschild metric in terms of resonances. The principal term in the expansion­Kamran­Smoller­Yau for the Kerr space-time [13]. Results on the decay of local energy are believed to be a prerequisite

  1. The X-ray flaring emission from High Mass X-ray Binaries: the effects of wind inhomogeneities

    E-print Network

    Ducci, L; Romano, P; Paizis, A; Mereghetti, S

    2010-01-01

    We have developed a clumpy stellar wind model for OB supergiants in order to compare predictions of this model with the X-ray behaviour of both classes of persistent and transient High Mass X-ray Binaries (HMXBs).

  2. Search for a low-mass scalar Higgs boson decaying to a tau pair in single-photon decays of ?(1S)

    E-print Network

    Cowan, Ray Franklin

    We search for a low-mass scalar CP-odd Higgs boson, A[superscript 0], produced in the radiative decay of the upsilon resonance and decaying into a ?[superscript +]?[superscript ?] pair: ?(1S) ? ?A[superscript 0]. The ...

  3. Low temperature growth of ultra-high mass density carbon nanotube forests on conductive supports

    SciTech Connect

    Sugime, Hisashi; Esconjauregui, Santiago; Yang, Junwei; D'Arsié, Lorenzo; Robertson, John [Department of Engineering, University of Cambridge, Cambridge CB3 0FA (United Kingdom)] [Department of Engineering, University of Cambridge, Cambridge CB3 0FA (United Kingdom); Oliver, Rachel A. [Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 0FS (United Kingdom)] [Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 0FS (United Kingdom); Bhardwaj, Sunil [Istituto Officina dei Materiali-CNR, Laboratorio TASC, Trieste I-34149 (Italy) [Istituto Officina dei Materiali-CNR, Laboratorio TASC, Trieste I-34149 (Italy); Sincrotrone Trieste S.C.p.A., Strada Statale 14, Km 163.5, Trieste I-34149 (Italy); Cepek, Cinzia [Istituto Officina dei Materiali-CNR, Laboratorio TASC, Trieste I-34149 (Italy)] [Istituto Officina dei Materiali-CNR, Laboratorio TASC, Trieste I-34149 (Italy)

    2013-08-12

    We grow ultra-high mass density carbon nanotube forests at 450 °C on Ti-coated Cu supports using Co-Mo co-catalyst. X-ray photoelectron spectroscopy shows Mo strongly interacts with Ti and Co, suppressing both aggregation and lifting off of Co particles and, thus, promoting the root growth mechanism. The forests average a height of 0.38 ?m and a mass density of 1.6 g cm{sup ?3}. This mass density is the highest reported so far, even at higher temperatures or on insulators. The forests and Cu supports show ohmic conductivity (lowest resistance ?22 k?), suggesting Co-Mo is useful for applications requiring forest growth on conductors.

  4. High-mass star formation due to cloud-cloud collisions

    NASA Technical Reports Server (NTRS)

    Scoville, N. Z.; Sanders, D. B.; Clemens, D. P.

    1986-01-01

    Observational evidence is presented for the compression of molecular gas in the interface between colliding GMCs, and it is proposed that this is the dominant mode for high-mass star formation in the Galaxy. For a sample of 94 GMCs associated with high-luminosity radio H II regions, the efficiency of OB star formation decreases significantly with increasing cloud mass over the observed mass range. It is concluded that star formation is generally not stimulated by an internal mechanism. The formation of OB stars by cloud-cloud collisions is suggested by the observed quadratic dependence of the Galactic H II region distribution on the local density of H2. The preference for OB star formation in spiral arms is then naturally accounted for by orbit crowding and the increased collision frequency of clouds in the spiral arms.

  5. Methanol masers as tools to study high-mass star formation

    E-print Network

    Michele Pestalozzi

    2007-04-23

    In this contribution I will attempt to show that the study of galactic 6.7 and 12.2GHz methanol masers themselves, as opposed to the use of methanol masers as signposts, can yield important conclusions contributing to the understanding of high-mass star formation. Due to their exclusive association with star formation, methanol masers are the best tools to do this, and their large number allows to probe the entire Galaxy. In particular I will focus on the determination of the luminosity function of methanol masers and on the determination of an unambiguous signature for a circumstellar masing disc seen edge-on. Finally I will try to point out some future fields of research in the study of methanol masers.

  6. Formation of high mass carbon cluster ions from laser ablation of polymers and thin carbon films

    NASA Astrophysics Data System (ADS)

    Creasy, William R.; Brenna, J. T.

    1990-02-01

    Three materials were studied by laser ablation/Fourier transform mass spectrometry, using 266 nm laser radiation: a copolymer of ethylene and tetrafluoroethylene (ETFE), polyphenylene sulfide (PPS), and a diamond-like carbon film (DLC). In each case, positive ion mass spectra exhibit primarily even-numbered, high mass carbon clusters (``fullerenes'') of the type previously reported for graphite ablation. In the case of ETFE, a large C+60 peak (``buckminsterfullerene'') was observed. The polymer spectra showed a strong dependence on the number of laser pulses on one spot and the laser power density. For ETFE, the fullerene ion relative intensity first increases and then decreases as a function of the number of laser pulses. For the DLC film, fullerenes are observed with a single laser pulse on a fresh spot of the sample. The results are interpreted in terms of a gas phase growth model for the fullerene ion formation.

  7. Optical properties of High-Mass X-ray Binaries (HMXBs) in the Small Magellanic Cloud

    NASA Astrophysics Data System (ADS)

    Coe, M. J.; Corbet, R. H. D.; McGowan, K. E.; McBride, V. A.; Schurch, M. P. E.; Townsend, L. J.; Galache, J. L.; Negueruela, I.; Buckley, D.

    2009-03-01

    The SMC represents an exciting opportunity to observe the direct results of tidal interactions on star birth. One of the best indicators of recent star birth activity is the presence of significant numbers of High-Mass X-ray Binaries (HMXBs) — and the SMC has them in abundance! We present results from nearly 10 years of monitoring these systems plus a wealth of other ground-based optical data. Together they permit us to build a picture of a galaxy with a mass of only a few percent of the Milky Way but with a more extensive HMXB population. However, as often happens, new discoveries lead to some challenging puzzles — where are the other X-ray binaries (e.g., black hole systems) in the SMC? And why do virtually all the SMC HMXBs have Be star companions? The evidence arising from these extensive optical observations for this apparently unusual stellar evolution are discussed.

  8. Further properties of high-mass multijet events at the Fermilab proton-antiproton collider

    SciTech Connect

    Abe, F.; Akimoto, H.; Akopian, A.; Albrow, M.G.; Amendolia, S.R.; Amidei, D.; Antos, J.; Anway-Wiese, C.; Aota, S.; Apollinari, G.; Asakawa, T.; Ashmanskas, W.; Atac, M.; Azfar, F.; Azzi-Bacchetta, P.; Bacchetta, N.; Badgett, W.; Bagdasarov, S.; Bailey, M.W.; Bao, J.; de Barbaro, P.; Barbaro-Galtieri, A.; Barnes, V.E.; Barnett, B.A.; Barzi, E.; Bauer, G.; Baumann, T.; Bedeschi, F.; Behrends, S.; Belforte, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Benlloch, J.; Bensinger, J.; Benton, D.; Beretvas, A.; Berge, J.P.; Berryhill, J.; Bertolucci, S.; Bhatti, A.; Biery, K.; Binkley, M.; Bisello, D.; Blair, R.E.; Blocker, C.; Bodek, A.; Bokhari, W.; Bolognesi, V.; Bortoletto, D.; Boudreau, J.; Breccia, L.; Bromberg, C.; Bruner, N.; Buckley-Geer, E.; Budd, H.S.; Burkett, K.; Busetto, G.; Byon-Wagner, A.; Byrum, K.L.; Cammerata, J.; Campagnari, C.; Campbell, M.; Caner, A.; Carithers, W.; Carlsmith, D.; Castro, A.; Cauz, D.; Cen, Y.; Cervelli, F.; Chang, P.S.; Chang, P.T.; Chao, H.Y.; Chapman, J.; Cheng, M.; Chiarelli, G.; Chikamatsu, T.; Chiou, C.N.; Christofek, L.; Cihangir, S.; Clark, A.G.; Cobal, M.; Contreras, M.; Conway, J.; Cooper, J.; Cordelli, M.; Couyoumtzelis, C.; Crane, D.; Cronin-Hennessy, D.; Culbertson, R.; Cunningham, J.D.; Daniels, T.; DeJongh, F.; Delchamps, S.; DellAgnello, S.; DellOrso, M.; Demina, R.; Demortier, L.; Denby, B.; Deninno, M.; Derwent, P.F.; Devlin, T.; Dittmann, J.R.; Donati, S.; Done, J.; Dorigo, T.; Dunn, A.; Eddy, N.; Einsweiler, K.; Elias, J.E.; Ely, R.; Engels, E. Jr.; Errede, D.; Errede, S.; Fan, Q.; Fiori, I.; Flaugher, B.; Foster, G.W.; Franklin, M.; Frautschi, M.; Freeman, J.; Friedman, J.; Frisch, H.; Fuess, T.A.; Fukui, Y.; Funaki, S.; Gagliardi, G.; Galeotti, S.; Gallinaro, M.; Garcia-Sciveres, M.; Garfinkel, A.F.; Gay, C.; Geer, S.; Gerdes, D.W.; Giannetti, P.; Giokaris, N.; Giromini, P.; Gladney, L.; Glenzinski, D.; Gold, M.; Gonzalez, J.; Gordon, A.; Goshaw, A.T.; Goulianos, K.; Grassmann, H.; Groer, L.

    1996-10-01

    The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in which events are distributed uniformly over the available multibody phase space. Multijet distributions corresponding to (4{ital N}{minus}4) variables that span the {ital N}-body parameter space are found to be well described by the QCD calculations for inclusive three-jet, four-jet, and five-jet events. The agreement between data, QCD matrix element calculations, and QCD parton shower Monte Carlo predictions suggests that 2{r_arrow}2 scattering plus gluon radiation provides a good first approximation to the full LO QCD matrix element for events with three, four, or even five jets in the final state. {copyright} {ital 1996 The American Physical Society.}

  9. Stability of high-mass molecular libraries: the role of the oligoporphyrin core

    PubMed Central

    Sezer, U?ur; Schmid, Philipp; Felix, Lukas; Mayor, Marcel; Arndt, Markus

    2015-01-01

    Molecular beam techniques are a key to many experiments in physical chemistry and quantum optics. In particular, advanced matter-wave experiments with high-mass molecules profit from the availability of slow, neutral and mass-selected molecular beams that are sufficiently stable to remain intact during laser heating and photoionization mass spectrometry. We present experiments on the photostability with molecular libraries of tailored oligoporphyrins with masses up to 25?000?Da. We compare two fluoroalkylsulfanyl-functionalized libraries based on two different molecular cores that offer the same number of anchor points for functionalization but differ in their geometry and electronic properties. A pentaporphyrin core stabilizes a library of chemically well-defined molecules with more than 1600 atoms. They can be neutrally desorbed with velocities as low as 20?m/s and efficiently analyzed in photoionization mass spectrometry. Copyright © 2015 John Wiley & Sons, Ltd. PMID:25601698

  10. HIGH ANGULAR RESOLUTION OBSERVATIONS OF FOUR CANDIDATE BLAST HIGH-MASS STARLESS CORES

    SciTech Connect

    Olmi, Luca; Poventud, Carlos M. [Physics Department, Rio Piedras Campus, University of Puerto Rico, Box 23343, UPR Station, San Juan, Puerto Rico (United States); Araya, Esteban D. [Physics Department, Western Illinois University, 1 University Circle, Macomb, IL 61455 (United States); Chapin, Edward L.; Gibb, Andrew [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 (Canada); Hofner, Peter [Physics Department, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801 (United States); Martin, Peter G., E-mail: olmi.luca@gmail.co, E-mail: olmi@arcetri.astro.i [Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8 (Canada)

    2010-06-01

    We discuss high angular resolution observations of ammonia toward four candidate high-mass starless cores (HMSCs). The cores were identified by the Balloon-borne Large Aperture Submillimeter Telescope (BLAST) during its 2005 survey of the Vulpecula region where 60 compact sources were detected simultaneously at 250, 350, and 500 {mu}m. Four of these cores, with no IRAS-PSC or MSX counterparts, were mapped with the NRAO Very Large Array and observed with the Effelsberg 100 m telescope in the NH{sub 3}(1,1) and (2,2) spectral lines. Our observations indicate that the four cores are cold (T {sub k} < 16 K) and show a filamentary and/or clumpy structure. They also show a significant velocity substructure within {approx}1 km s{sup -1}. The four BLAST cores appear to be colder and more quiescent than other previously observed HMSC candidates, suggesting an earlier stage of evolution.

  11. Are Molecular Outflows around High-mass Stars Driven by Ionization Feedback?

    NASA Astrophysics Data System (ADS)

    Peters, Thomas; Klaassen, Pamela D.; Mac Low, Mordecai-Mark; Klessen, Ralf S.; Banerjee, Robi

    2012-11-01

    The formation of massive stars exceeding 10 M ? usually results in large-scale molecular outflows. Numerical simulations, including ionization, of the formation of such stars show evidence for ionization-driven molecular outflows. Here we examine whether the outflows seen in these models reproduce the observations. We compute synthetic ALMA and CARMA maps of CO emission lines of the outflows, and compare their signatures to existing single-dish and interferometric data. We find that the ionization-driven models can only reproduce weak outflows around high-mass star-forming regions. We argue that expanding H II regions probably do not represent the dominant mechanism for driving observed outflows. We suggest instead that observed outflows are driven by the collective action of the outflows from the many lower-mass stars that inevitably form around young massive stars in a cluster.

  12. ARE MOLECULAR OUTFLOWS AROUND HIGH-MASS STARS DRIVEN BY IONIZATION FEEDBACK?

    SciTech Connect

    Peters, Thomas; Klessen, Ralf S. [Institut fuer Theoretische Astrophysik, Universitaet Heidelberg, Zentrum fuer Astronomie, Albert-Ueberle-Str. 2, D-69120 Heidelberg (Germany); Klaassen, Pamela D. [European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany); Mac Low, Mordecai-Mark [Department of Astrophysics, American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024-5192 (United States); Banerjee, Robi, E-mail: tpeters@physik.uzh.ch [Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg (Germany)

    2012-11-20

    The formation of massive stars exceeding 10 M {sub Sun} usually results in large-scale molecular outflows. Numerical simulations, including ionization, of the formation of such stars show evidence for ionization-driven molecular outflows. Here we examine whether the outflows seen in these models reproduce the observations. We compute synthetic ALMA and CARMA maps of CO emission lines of the outflows, and compare their signatures to existing single-dish and interferometric data. We find that the ionization-driven models can only reproduce weak outflows around high-mass star-forming regions. We argue that expanding H II regions probably do not represent the dominant mechanism for driving observed outflows. We suggest instead that observed outflows are driven by the collective action of the outflows from the many lower-mass stars that inevitably form around young massive stars in a cluster.

  13. High Mass Star Formation. II. The Mass Function of Submillimeter Clumps in M17

    E-print Network

    M. A. Reid; C. D. Wilson

    2006-03-13

    We have mapped an approximately 5.5 by 5.5 pc portion of the M17 massive star-forming region in both 850 and 450 micron dust continuum emission using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT). The maps reveal more than 100 dusty clumps with deconvolved linear sizes of 0.05--0.2 pc and masses of 0.8--120 solar masses, most of which are not associated with known mid-infrared point sources. Fitting the clump mass function with a double power law gives a mean power law exponent of alpha_high = -2.4 +/- 0.3 for the high-mass power law, consistent with the exponent of the Salpeter stellar mass function. We show that a lognormal clump mass distribution with a peak at about 4 solar masses produces as good a fit to the clump mass function as does a double power law. This 4 solar mass peak mass is well above the peak masses of both the stellar initial mass function and the mass function of clumps in low-mass star-forming regions. Despite the difference in intrinsic mass scale, the shape of the M17 clump mass function appears to be consistent with the shape of the core mass function in low-mass star-forming regions. Thus, we suggest that the clump mass function in high-mass star-forming regions may be a scaled-up version of that in low-mass regions, instead of its extension to higher masses.

  14. High Resolution, Long - Slit Spectroscopy of VY CMa: The Evidence for Localized High Mass Loss Events

    E-print Network

    Roberta M. Humphreys; Kris Davidson; Gerald Ruch; George Wallerstein

    2004-10-16

    High spatial and spectral resolution spectroscopy of the OH/IR supergiant VY CMa and its circumstellar ejecta reveals evidence for high mass loss events from localized regions on the star occurring over the past 1000 years. The reflected absorption lines and the extremely strong K I emission lines show a complex pattern of velocities in the ejecta. We show that the large, dusty NW arc, expanding at 50 km/sec with respect to the embedded star, is kinematically distinct from the surrounding nebulosity and was ejected about 400 years ago. Other large, more filamentary loops were probably expelled as much as 800 to 1000 years ago while knots and small arcs close to the star resulted from more recent events 100 to 200 years ago. The more diffuse, uniformly distributed gas and dust is surprisingly stationary with little or no velocity relative to the star. This is not what we would expect for the circumstellar material from an evolved red supergiant with a long history of mass loss. We therefore suggest that the high mass loss rate for VY CMa is a measure of the mass carried out by these specific ejections accompanied by streams or flows of gas through low density regions in the dust envelope. VY CMa may thus be our most extreme example of stellar activity, but our results also bring into question the evolutionary state of this famous star. In a separate Appendix, we discuss the origin of the very strong K I and other rare emission lines in its spectrum.

  15. A Survey of Large Molecules of Biological Interest toward Selected High Mass Star Forming Regions

    NASA Technical Reports Server (NTRS)

    Remijan, A.; Shiao, Y.-S.; Friedel, D. N.; Meier, D. S.; Snyder, L. E.

    2004-01-01

    We have surveyed three high mass Galactic star forming regions for interstellar methanol (CH3OH), formic acid (HCOOH), acetic acid (CH3COOH), methyl formate (HCOOCH3), methyl cyanide (CH3CN), and ethyl cyanide (CH3CH2CN) with the BIMA Array. From our observations, we have detected two new sources of interstellar HCOOH toward the hot core regions G19.61-0.23 and W75N. We have also made the first detections of CH3CH2CN and HCOOCH3 toward G19.61-0.23. The relative HCOOH/HCOOCH3 abundance ratio toward G19.61-0.23 is 0.18 which is comparable to the abundance ratios found by Liu and colleagues toward Sgr B2(N-LMH), Orion and W51(approximately 0.10). We have made the first detection of HCOOCH3 toward W75N. The relative HCOOH/HCOOCH3 abundance ratio toward W75N is 0.26 which is more than twice as large as the abundance ratios found by Liu and colleagues. Furthermore, the hot core regions around W75N show a chemical differentiation between the O and N cores similar to what is seen toward the Orion Hot Core and Compact Ridge and W3(OH) and W3(H2O). It is also apparent from our observations that the high mass star forming region G45.47+0.05 does not contain any compact hot molecular core and as a consequence its chemistry may be similar to cold dark clouds. Finally, the formation of CH3COOH appears to favor HMCs with well mixed N and O, despite the fact that CH3COOH does not contain a N atom. If proved to be true, this is an important constraint on CH3COOH formation and possibly other structurally similar biomolecules.

  16. Precision Electroweak Measurements on the Z Resonance

    Microsoft Academic Search

    S. Schael; R Barate; R Brunelière; Damir Buskulic; I De Bonis; D Décamp; P Ghez; C Goy; S Jézéquel; J P Lees; A Lucotte; F Martin; E Merle; M N Minard; J Y Nief; P Odier; B Pietrzyk; B Trocmé; S Bravo; M P Casado; M Chmeissani; P Comas; J M Crespo; E Fernández; M Fernández-Bosman; L Garrido; E Graugès-Pous; A Juste; M Martínez; G Merino; R Miquel; L M Mir; S Orteu; A Pacheco; I C Park; J Perlas; I Riu; H Ruiz; F Sánchez; A Colaleo; D Creanza; N De Filippis; M De Palma; G Iaselli; G Maggi; M Maggi; S Nuzzo; A Ranieri; G Raso; F Ruggieri; G Selvaggi; L Silvestris; P Tempesta; A Tricomi; G Zito; X Huang; J Lin; Q Ouyang; T Wang; Y Xie; R Xu; S Xue; J Zhang; L Zhang; W Zhao; D Abbaneo; A Bazarko; U Becker; G Boix; F Bird; E Blucher; B Bonvicini; P Bright-Thomas; T Barklow; M Cattaneo; F Cerutti; B Clerbaux; H Drevermann; R W Forty; M Frank; T C Greening; R Hagelberg; A W Halley; F Gianotti; M Girone; J B Hansen; J Harvey; R Jacobsen; D E Hutchcroft; P Janot; B Jost; J Knobloch; M Kado; Ivan Lehraus; Pierre Lazeyras; P Maley; P Mato; J May; A Moutoussi; M Pepé-Altarelli; F Ranjard; Luigi Rolandi; W D Schlatter; B Schmitt; O Schneider; W Tejessy; F Teubert; I R Tomalin; E Tournefier; R Veenhof; A Valassi; W Wiedenmann; A E Wright; Ziad J Ajaltouni; F Badaud; G Chazelle; O Deschamps; S Dessagne; A Falvard; C Ferdi; D Fayolle; P Gay; C Guicheney; P Henrard; J Jousset; B Michel; S Monteil; J C Montret; D Pallin; J M Pascolo; P Perret; F Podlyski; H Bertelsen; T Fernley; J D Hansen; P H Hansen; A C Kraan; A Lindahl; R Møllerud; B S Nilsson; B Rensch; A Wäänänen; G Daskalakis; A Kyriakis; C Markou; E Simopoulou; I Siotis; A Vayaki; A Blondel; G Bonneaud; J C Brient; F Machefert; A Rougé; M Rumpf; M Swynghedauw; R Tanaka; M Verderi; H L Videau; V Ciulli; E Focardi; G Parrini; K Zachariadou; M Corden; C H Georgiopoulos; A Antonelli; M Antonelli; G Bencivenni; G Bologna; F Bossi; P Campana; G Capon; V Chiarella; G Felici; P Laurelli; G Mannocchi; G P Murtas; L Passalacqua; P Picchi; P Colrain; I ten Have; I S Hughes; J Kennedy; I G Knowles; J G Lynch; W T Morton; P Negus; V O'Shea; C Raine; P Reeves; J M Scarr; K Smith; A S Thompson; R M Turnbull; S R Wasserbaech; O L Buchmüller; R J Cavanaugh; S Dhamotharan; C Geweniger; P Hanke; G Hansper; V Hepp; E E Kluge; A Putzer; J Sommer; K Tittel; W Werner; M Wunsch; R Beuselinck; D M Binnie; W Cameron; G Davies; P J Dornan; S M Goodsir; N Marinelli; E Martin; J Nash; J Nowell; S A Rutherford; J K Sedgbeer; J C Thompson; R White; M D Williams; V M Ghete; P Girtler; E Kneringer; D Kuhn; G Rudolph; E Bouhova-Thacker; C K Bowdery; P G Buck; D P Clarke; G Ellis; A J Finch; F Foster; G Hughes; R W L Jones; N R Keemer; M R Pearson; N A Robertson; T Sloan; M Smizanska; S W Snow; M I Williams; O van der Aa; C Delaere; G Leibenguth; V Lemaître; L A T Bauerdick; U Blumenschein; P Van Gemmeren; I Giehl; F Hölldorfer; K Jakobs; M Kasemann; F Kayser; K Kleinknecht; A S Müller; G Quast; B Renk; E Rohne; H G Sander; S Schmeling; H W Wachsmuth; R Wanke; C Zeitnitz; T Ziegler; Jean-Jacques Aubert; C Benchouk; A Bonissent; J Carr; P Coyle; C Curtil; A Ealet; F Etienne; D Fouchez; F Motsch; P Payre; D Rousseau; M Talby; M Thulasidas; M Aleppo; F Ragusa; V Büscher; A David; H Dietl; G Ganis; K Hüttmann; G Lütjens; C Mannert; W Männer; H G Moser; R Settles; H Seywerd; H Stenzel; M Villegas; G Wolf; J Boucrot; O Callot; S Chen; A Cordier; M Davier; L Duflot; J F Grivaz; P Heusse; A Jacholkowska; F R Le Diberder; J Lefrançois; A M Mutz; M H Schune; L Serin; J J Veillet; I Videau; D Zerwas; P Azzurri; G Bagliesi; S Bettarini; T Boccali; C Bozzi; G Calderini; R Dell'Orso; R Fantechi; I Ferrante; F Fidecaro; L Foà; A Giammanco; A Giassi; A Gregorio; F Ligabue; A Lusiani; P S Marrocchesi; A Messineo; F Palla; G Rizzo; G Sanguinetti; A Sciabà; G Sguazzoni; P Spagnolo; J Steinberger; R Tenchini; C Vannini; A Venturi; P G Verdini; O Awunor; G A Blair; G Cowan; A García-Bellido; M G Green; T Medcalf; J A Strong; P Teixeira-Dias; David R Botterill; R W Clifft; T R Edgecock; M Edwards; S J Haywood; P R Norton; J J Ward; B Bloch-Devaux; D E Boumediene; P Colas; S Emery; B Fabbro; Witold Kozanecki; E Lançon; M C Lemaire; E Locci; P Pérez; J Rander; J F Renardy; A Roussarie; J P Schuller; J Schwindling; B Tuchming; B Vallage; S N Black; J H Dann; H Y Kim; N P Konstantinidis; A M Litke; M A McNeil; G Taylor; C N Booth; S Cartwright; F Combley; P N Hodgson; M H Lehto; L F Thompson; K Affholderbach; E Barberio; A Böhrer; S Brandt; H Burkhardt; E Feigl; C Grupen; J Hess; G Lutters; H Meinhard; J A Minguet-Rodríguez; L Mirabito; A Misiejuk; E Neugebauer; A Ngac; G Prange; F Rivera; P Saraiva; U Schäfer; U Sieler; L Smolik; F Stephan; H Trier; M Apollonio; C Borean; L Bosisio; R Della Marina; G Giannini; B Gobbo; G Musolino; L Pitis; H He; J Pütz; J E Rothberg; S R Armstrong; L Bellantoni; K Berkelman; D Cinabro; J S Conway; K Cranmer

    2006-01-01

    We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarised beam at SLC.

  17. Evolution and excitation conditions of outflows in high-mass star-forming regions

    NASA Astrophysics Data System (ADS)

    Sánchez-Monge, Á.; López-Sepulcre, A.; Cesaroni, R.; Walmsley, C. M.; Codella, C.; Beltrán, M. T.; Pestalozzi, M.; Molinari, S.

    2013-09-01

    Context. Theoretical models suggest that massive stars form via disk-mediated accretion in a similar fashion to low-mass stars. In this scenario, bipolar outflows ejected along the disk axis play a fundamental role, and their study can help characterize the different evolutionary stages involved in the formation of a high-mass star. A recent study toward massive molecular outflows has revealed a decrease in the SiO line intensity as the object evolves. Aims: The present study aims to characterize the variation of the molecular outflow properties with time and to study the SiO excitation conditions in outflows associated with high-mass young stellar objects (YSOs). Methods: We used the IRAM 30-m telescope on Pico Veleta (Spain) to map 14 high-mass star-forming regions in the SiO (2-1), SiO (5-4), and HCO+ (1-0) lines, which trace the molecular outflow emission. The FTS backend, covering a total frequency range of ~15 GHz, allowed us to simultaneously map several dense gas (e.g., N2H+, C2H, NH2D, H13CN) and hot-core (CH3CN) tracers. We used the Hi-GAL data to improve the previous spectral energy distributions and obtained a more accurate dust envelope mass and bolometric luminosity for each source. We calculated the luminosity-to-mass ratio, which is believed to be a good indicator of the evolutionary stage of the YSO. Results: We detect SiO and HCO+ outflow emission in all fourteen sources and bipolar structures in six of them. The outflow parameters are similar to those found toward other massive YSOs with luminosities 103-104L?. We find an increase in the HCO+ outflow energetics as the object evolves, and a decrease in the SiO abundance with time from 10-8 to 10-9. The SiO (5-4) to (2-1) line ratio is found to be low at the ambient gas velocity, and increases as we move to red-/blue-shifted velocities, indicating that the excitation conditions of the SiO change with the velocity of the gas. In particular, the high-velocity SiO gas component seems to arise from regions with higher densities and/or temperatures than the SiO emission at the ambient gas velocity. Conclusions: The properties of the SiO and HCO+ outflow emission suggest a scenario in which SiO is largely enhanced in the first evolutionary stages, probably owing to strong shocks produced by the protostellar jet. As the object evolves, the power of the jet would decrease and so does the SiO abundance. During this process, however, the material surrounding the protostar would have been been swept up by the jet, and the outflow activity, traced by entrained molecular material (HCO+), would increase with time. Appendix A is available in electronic form at http://www.aanda.orgDatacubes as FITS files are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/557/A94

  18. Kinematic and thermal structure at the onset of high-mass star formation

    NASA Astrophysics Data System (ADS)

    Bihr, S.; Beuther, H.; Linz, H.; Ragan, S. E.; Hennemann, M.; Tackenberg, J.; Smith, R. J.; Krause, O.; Henning, Th.

    2015-07-01

    Context. Even though high-mass stars are crucial for understanding a diversity of processes within our galaxy and beyond, their formation and initial conditions are still poorly constrained. Aims: We want to understand the kinematic and thermal properties of young massive gas clumps prior to and at the earliest evolutionary stages of high-mass star formation. Do we find signatures of gravitational collapse? Do we find temperature gradients in the vicinity or absence of infrared emission sources? Do we find coherent velocity structures toward the center of the dense and cold gas clumps? Methods: To determine kinematics and gas temperatures, we used ammonia, because it is known to be a good tracer and thermometer of dense gas. We observed the NH3 (1, 1) and (2, 2) lines within six very young high-mass star-forming regions comprised of infrared dark clouds (IRDCs), along with ISO-selected far-infrared emission sources (ISOSS) with the Karl G. Jansky Very Large Array (VLA) and the Effelsberg 100 m Telescope. Results: The molecular line data allows us to study velocity structures, linewidths, and gas temperatures at high spatial resolution of 3-5'', corresponding to ~0.05 pc at a typical source distance of 2.5 kpc. We find on average cold gas clumps with temperatures in the range between 10 K and 30 K. The observations do not reveal a clear correlation between infrared emission peaks and ammonia temperature peaks. Several infrared emission sources show ammonia temperature peaks up to 30 K, whereas other infrared emission sources show no enhanced kinetic gas temperature in their surrounding. We report an upper limit for the linewidth of ~1.3 km s-1, at the spectral resolution limit of our VLA observation. This indicates a relatively low level of turbulence on the scale of the observations. Velocity gradients are present in almost all regions with typical velocity differences of 1 to 2 km s-1 and gradients of 5 to 10 km s-1 pc-1. These velocity gradients are smooth in most cases, but there is one exceptional source (ISOSS23053), for which we find several velocity components with a steep velocity gradient toward the clump centers that is larger than 30 km s-1 pc-1. This steep velocity gradient is consistent with recent models of cloud collapse. Furthermore, we report a spatial correlation of ammonia and cold dust, but we also find decreasing ammonia emission close to infrared emission sources. FITS files of Figs. 1 to 6 are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/579/A51Appendix A is available in electronic form at http://www.aanda.org

  19. Determination of the ? ( 3770 ) , ? ( 4040 ) , ? ( 4160 ) and ? ( 4415 ) resonance parameters

    Microsoft Academic Search

    M. Ablikim; J. Z. Bai; Y. Ban; X. Cai; H. F. Chen; H. S. Chen; H. X. Chen; J. C. Chen; Y. B. Chen; Y. P. Chu; Y. S. Dai; L. Y. Diao; Z. Y. Deng; Q. F. Dong; S. X. Du; J. Fang; S. S. Fang; C. D. Fu; C. S. Gao; Y. N. Gao; S. D. Gu; Y. T. Gu; Y. N. Guo; Z. J. Guo; F. A. Harris; K. L. He; M. He; Y. K. Heng; J. Hou; H. M. Hu; J. H. Hu; T. Hu; G. S. Huang; X. T. Huang; X. B. Ji; X. S. Jiang; X. Y. Jiang; J. B. Jiao; D. P. Jin; S. Jin; Y. F. Lai; G. Li; H. B. Li; J. Li; R. Y. Li; S. M. Li; W. D. Li; W. G. Li; X. L. Li; X. N. Li; X. Q. Li; Y. F. Liang; H. B. Liao; B. J. Liu; C. X. Liu; F. Liu; Fang Liu; H. H. Liu; H. M. Liu; J. Liu; J. P. Liu; Jian Liu; Q. Liu; R. G. Liu; Z. A. Liu; Y. C. Lou; F. Lu; G. R. Lu; J. G. Lu; C. L. Luo; F. C. Ma; H. L. Ma; L. L. Ma; Q. M. Ma; Z. P. Mao; X. H. Mo; J. Nie; S. L. Olsen; R. G. Ping; N. D. Qi; H. Qin; J. F. Qiu; Z. Y. Ren; G. Rong; X. D. Ruan; L. Y. Shan; L. Shang; C. P. Shen; D. L. Shen; X. Y. Shen; H. Y. Sheng; H. S. Sun; S. S. Sun; Y. Z. Sun; Z. J. Sun; X. Tang; G. L. Tong; G. S. Varner; D. Y. Wang; L. Wang; L. L. Wang; M. Wang; P. Wang; W. F. Wang; Y. F. Wang; Z. Wang; C. L. Wei; D. H. Wei; Y. Weng; N. Wu; X. M. Xia; X. X. Xie; G. F. Xu; X. P. Xu; Y. Xu; M. L. Yan; H. X. Yang; Y. X. Yang; M. H. Ye; Y. X. Ye; G. W. Yu; C. Z. Yuan; Y. Yuan; S. L. Zang; Y. Zeng; B. X. Zhang; C. C. Zhang; D. H. Zhang; H. Q. Zhang; H. Y. Zhang; J. W. Zhang; S. H. Zhang; X. Y. Zhang; Yiyun Zhang; Z. X. Zhang; Z. P. Zhang; D. X. Zhao; J. W. Zhao; M. G. Zhao; P. P. Zhao; W. R. Zhao; Z. G. Zhao; H. Q. Zheng; J. P. Zheng; Z. P. Zheng; L. Zhou; K. J. Zhu; Q. M. Zhu; Y. C. Zhu; Y. S. Zhu; Z. A. Zhu; B. A. Zhuang; X. A. Zhuang; B. S. Zou

    2008-01-01

    R values measured with the BESII detector at center-of-mass energies between 3.7 and 5.0 GeV are fitted to determine resonance parameters (mass, total width, electron width) of the high mass charmonium states, ?(3770), ?(4040), ?(4160) and ?(4415). Various effects, including the interferences and relative phases between the resonances, the energy-dependence of the full widths, and the initial state radiative correction,

  20. Charged track multiplicity in B meson decay

    NASA Astrophysics Data System (ADS)

    Brandenburg, G.; Ershov, A.; Gao, Y. S.; Kim, D. Y.-J.; Wilson, R.; Browder, T. E.; Li, Y.; Rodriguez, J. L.; Yamamoto, H.; Bergfeld, T.; Eisenstein, B. I.; Ernst, J.; Gladding, G. E.; Gollin, G. D.; Hans, R. M.; Johnson, E.; Karliner, I.; Marsh, M. A.; Palmer, M.; Plager, C.; Sedlack, C.; Selen, M.; Thaler, J. J.; Williams, J.; Edwards, K. W.; Janicek, R.; Patel, P. M.; Sadoff, A. J.; Ammar, R.; Baringer, P.; Bean, A.; Besson, D.; Davis, R.; Kotov, S.; Kravchenko, I.; Kwak, N.; Zhao, X.; Anderson, S.; Frolov, V. V.; Kubota, Y.; Lee, S. J.; Mahapatra, R.; O'neill, J. J.; Poling, R.; Riehle, T.; Smith, A.; Ahmed, S.; Alam, M. S.; Athar, S. B.; Jian, L.; Ling, L.; Mahmood, A. H.; Saleem, M.; Timm, S.; Wappler, F.; Anastassov, A.; Duboscq, J. E.; Gan, K. K.; Gwon, C.; Hart, T.; Honscheid, K.; Kagan, H.; Kass, R.; Lorenc, J.; Schwarthoff, H.; Spencer, M. B.; von Toerne, E.; Zoeller, M. M.; Richichi, S. J.; Severini, H.; Skubic, P.; Undrus, A.; Bishai, M.; Chen, S.; Fast, J.; Hinson, J. W.; Lee, J.; Menon, N.; Miller, D. H.; Shibata, E. I.; Shipsey, I. P.; Kwon, Y.; Lyon, A. L.; Thorndike, E. H.; Jessop, C. P.; Lingel, K.; Marsiske, H.; Perl, M. L.; Savinov, V.; Ugolini, D.; Zhou, X.; Coan, T. E.; Fadeyev, V.; Korolkov, I.; Maravin, Y.; Narsky, I.; Stroynowski, R.; Ye, J.; Wlodek, T.; Artuso, M.; Ayad, R.; Dambasuren, E.; Kopp, S.; Majumder, G.; Moneti, G. C.; Mountain, R.; Schuh, S.; Skwarnicki, T.; Stone, S.; Titov, A.; Viehhauser, G.; Wang, J. C.; Wolf, A.; Wu, J.; Csorna, S. E.; McLean, K. W.; Marka, S.; Xu, Z.; Godang, R.; Kinoshita, K.; Lai, I. C.; Pomianowskie, P.; Schrenk, S.; Bonvicini, G.; Cinabro, D.; Greene, R.; Perera, L. P.; Zhou, G. J.; Chan, S.; Eigen, G.; Lipeles, E.; Schmidtler, M.; Shapiro, A.; Sun, W. M.; Urheim, J.; Weinstein, A. J.; Würthwein, F.; Jaffe, D. E.; Masek, G.; Paar, H. P.; Potter, E. M.; Prell, S.; Sharma, V.; Asner, D. M.; Eppich, A.; Gronberg, J.; Hill, T. S.; Lange, D. J.; Morrison, R. J.; Nelson, T. K.; Richman, J. D.; Roberts, D.; Briere, R. A.; Behrens, B. H.; Ford, W. T.; Gritsan, A.; Krieg, H.; Roy, J.; Smith, J. G.; Alexander, J. P.; Baker, R.; Bebek, C.; Berger, B. E.; Berkelman, K.; Blanc, F.; Boisvert, V.; Cassel, D. G.; Dickson, M.; von Dombrowski, S.; Drell, P. S.; Ecklund, K. M.; Ehrlich, R.; Foland, A. D.; Gaidarev, P.; Galik, R. S.; Gibbons, L.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hopman, P. I.; Jones, C. D.; Kreinick, D. L.; Lee, T.; Liu, Y.; Meyer, T. O.; Mistry, N. B.; Ng, C. R.; Nordberg, E.; Patterson, J. R.; Peterson, D.; Riley, D.; Thayer, J. G.; Thies, P. G.; Valant-Spaight, B.; Warburton, A.; Avery, P.; Lohner, M.; Prescott, C.; Rubiera, A. I.; Yelton, J.; Zheng, J.

    2000-04-01

    We have used the CLEO II detector to study the multiplicity of charged particles in the decays of B mesons produced at the ?(4S) resonance. Using a sample of 1.5×106 B meson pairs, we find the mean inclusive charged particle multiplicity to be 10.71+/-0.02+0.21-0.15 for the decay of the pair. This corresponds to a mean multiplicity of 5.36+/-0.01+0.11-0.08 for a single B meson. Using the same data sample, we have also extracted the mean multiplicities in semileptonic and nonleptonic decays. We measure a mean of 7.82+/-0.05+0.21-0.19 charged particles per BB¯ decay when both mesons decay semileptonically. When neither B meson decays semileptonically, we measure a mean charged particle multiplicity of 11.62+/-0.04+0.24-0.18 per BB¯ pair.

  1. Molecular Outflows in Low- and High-Mass Star Forming Regions

    E-print Network

    Hector G. Arce; Debra Shepherd; Frederic Gueth; Chin-Fei Lee; Rafael Bachiller; Alexander Rosen; Henrik Beuther

    2006-03-03

    We review the known properties of molecular outflows from low- and high-mass young stars. General trends among outflows are identified, and the most recent studies on the morphology, kinematics, energetics, and evolution of molecular outflows are discussed, focusing on results from high-resolution millimeter observations. We review the existing four broad classes of outflow models and compare numerical simulations with the observational data. A single class of models cannot explain the range of morphological and kinematic properties that are observed, and we propose a possible solution. The impact of outflows on their cloud is examined, and we review how outflows can disrupt their surrounding environment, through the clearing of gas and the injection of momentum and energy onto the gas at distances from their powering sources from about 0.01 to a few pc. We also discuss the effects of shock-induced chemical processes on the ambient medium, and how these processes may act as a chemical clock to date outflows. Lastly, future outflow research with existing and planned millimeter and submillimeter instruments is presented.

  2. Heating and ionization of the primordial intergalactic medium by high-mass X-ray binaries

    NASA Astrophysics Data System (ADS)

    Knevitt, G.; Wynn, G. A.; Power, C.; Bolton, J. S.

    2014-12-01

    We investigate the influence of high-mass X-ray binaries (HMXBs) on their high-redshift environments. Using a one-dimensional radiative transfer code, we predict the ionization and temperature profiles surrounding a coeval stellar population, composed of main-sequence stars and HMXBs, at various times after its formation. We consider both uniform density surroundings, and a cluster embedded in a 108 M? Navarro-Frenk-White (NFW) halo. HMXBs in a constant density environment produce negligible enhanced ionization because of their high-energy spectral energy distributions and short lifetimes. In this case, HMXBs only marginally contribute to the local heating rate. For NFW profiles, radiation from main-sequence stars cannot prevent the initially ionized volume from recombining since it is unable to penetrate the high-density galactic core. However, HMXB photons stall recombinations behind the front, keeping it partially ionized for longer. The increased electron density in these partially ionized regions promotes further cooling, resulting in lower intergalactic medium (IGM) temperatures. In the context of this starburst model, we have shown that HMXBs do not make a major contribution to reionization or IGM heating. However, X-ray escape fractions are high in both density profile cases. Continuous star formation may result in the build up of X-rays over time, reducing the ionization time-scale and potentially leading to low level ionization of the distant IGM.

  3. Accelerating an Water Maser Face-on Jet from a High Mass Young Stellar Object

    E-print Network

    Motogi, Kazuhito; Honma, Mareki; Hirota, Tomoya; Hachisuka, Kazuya; Niinuma, Kotaro; Sugiyama, Koichiro; Yonekura, Yosinori; Fujisawa, Kenta

    2015-01-01

    We report on a long-term single-dish and VLBI monitoring for intermittent flare activities of a Dominant Blue-Shifted H$_{2}$O Maser (DBSM) associated with a southern high mass young stellar object, G353.273+0.641. Bi-weekly single-dish monitoring using Hokkaido University Tomakomai 11-m radio telescope has shown that a systematic acceleration continues over four years beyond a lifetime of individual maser features. This fact suggests that the H$_{2}$O maser traces a region where molecular gas is steadily accelerated. There were five maser flares during five-years monitoring, and maser distributions in four of them were densely monitored by the VLBI Exploration of Radio Astrometry (VERA). The overall distribution of the maser features suggests the presence of a bipolar jet, with the 3D kinematics indicating that it is almost face-on (inclination angle of $\\sim$ 8$^{\\fdg}$--17$^{\\fdg}$ from the line-of-sight). Most of maser features were recurrently excited within a region of 100$\\times$100 AU$^{2}$ around the...

  4. Metallicity dependence of high-mass X-ray binary populations

    NASA Astrophysics Data System (ADS)

    Douna, V. M.; Pellizza, L. J.; Mirabel, I. F.; Pedrosa, S. E.

    2015-07-01

    Context. High-mass X-ray binaries (HMXBs) might have contributed a non-negligible fraction of the energy feedback to the interstellar and intergalactic media at high redshift, becoming important sources for the heating and ionization history of the Universe. However, the importance of this contribution depends on the hypothesized increase in the number of HMXBs formed in low-metallicity galaxies and in their luminosities. Aims: In this work we test the aforementioned hypothesis, and quantify the metallicity dependence of HMXB population properties. Methods: We compile from the literature a large set of data on the sizes and X-ray luminosities of HMXB populations in nearby galaxies with known metallicities and star formation rates. We use Bayesian inference to fit simple Monte Carlo models that describe the metallicity dependence of the size and luminosity of the HMXB populations. Results: We find that HMXBs are typically ten times more numerous per unit star formation rate in low-metallicity galaxies (12 + log (O / H) < 8, namely <20% solar) than in solar-metallicity galaxies. The metallicity dependence of the luminosity of HMXBs is small compared to that of the population size. Conclusions: Our results support the hypothesis that HMXBs are more numerous in low-metallicity galaxies, implying the need to investigate the feedback in the form of X-rays and energetic mass outflows of these high-energy sources during cosmic dawn.

  5. The shadow wind in high-mass X-ray binaries

    NASA Technical Reports Server (NTRS)

    Blondin, John M.

    1994-01-01

    We present hydrodynamic simulations of the most X-ray luminous high-mass X-ray binary systems, such as Cen X-3 and SMC X-1. These models illustrate the presence of both a normal radiatively driven wind confined to the X-ray shadow of the primary star -- a shadow wind -- and a thermally driven wind excited by the X-ray heating of the primary's stellar surface -- an X-ray-excited wind. The X-ray flux in these systems is sufficiently intense that any circumstellar gas exposed to the X-ray source will be highly photoionized. These extreme ionization conditions prevent the formation of a normal radiatively driven wind from the irradiated surface of the primary, but such a wind can still form on the shadowed side of the primary. Orbital rotation can then bring this shadow wind into the line of sight toward the X-ray source, enhancing the column density of the wind seen near eclipse egress. Furthermore, such a high X-ray flux can also excite a thermal wind from the irradiated surface of the primary. Again, orbital rotation tends to deflect the wind, this time leading to an enhanced column density near eclipse ingress.

  6. G0.253+0.016: A centrally condensed, high-mass protocluster

    E-print Network

    Rathborne, J M; Jackson, J M; Foster, J B; Contreras, Y; Garay, G; Testi, L; Alves, J F; Bally, J; Bastian, N; Kruijssen, J M D; Bressert, E

    2014-01-01

    Despite their importance as stellar nurseries and the building blocks of galaxies, very little is known about the formation of the highest mass clusters. The dense clump G0.253+0.016 represents an example of a clump that may form an Arches-like, high-mass cluster. Here we present molecular line maps toward G0.253+0.016 taken as part of the MALT90 molecular line survey, complemented with APEX observations. Combined, these data reveal the global physical properties and kinematics of G0.253+0.016. Recent Herschel data show that while the dust temperature is low (~19 K) toward its centre, the dust temperature on the exterior is higher (~27 K) due to external heating. Our new molecular line data reveal that, overall, the morphology of dense gas detected toward G0.253+0.016 matches very well its IR extinction and dust continuum emission. An anti-correlation between the dust and gas column densities toward its centre indicates that the clump is centrally condensed with a cold, dense interior in which the molecular g...

  7. High-Mass X-ray Binaries in the Milky Way: A closer look with INTEGRAL

    E-print Network

    Walter, Roland; Bozzo, Enrico; Tsygankov, Sergey S

    2015-01-01

    High-mass X-ray binaries are fundamental in the study of stellar evolution, nucleosynthesis, structure and evolution of galaxies and accretion processes. Hard X-rays observations by INTEGRAL and Swift have broad- ened significantly our understanding in particular for the super-giant systems in the Milky Way, which number has increased by almost a factor of three. INTEGRAL played a crucial role in the discovery, study and understanding of heavily obscured systems and of fast X-ray transients. Most super-giant systems can now be classified in three categories: classical/obscured, eccentric and fast transient. The classical systems feature low eccentricity and variability factor of about 1000, mostly driven by hydrodynamic phenomena occurring on scales larger than the accretion radius. Among them, systems with short orbital periods and close to Roche-Lobe overflow or with slow winds, appear highly obscured. In eccentric systems, the variability amplitude can reach even higher factors, because of the contrast of ...

  8. Physics of High-Mass Dimuon Production at the 50-GeV Proton Synchrotron

    E-print Network

    J. C. Peng; G. T. Garvey; J. M. Moss; S. Sawada; J. Chiba

    2000-07-28

    We discuss the physics interest and the experimental feasibility for detecting high-mass dimuon pairs using the planned 50-GeV Proton Synchrotron (PS) at the KEK/JHF and JAERI/NSP joint accelerator project. The Drell-Yan measurement of $p+d$ versus $p+p$ at 50 GeV will provide unique information on the flavor asymmetry of proton's up and down sea-quark distributions in the large-$x$ region. A study of the nuclear dependences of Drell-Yan cross sections can reveal the modification of antiquark distributions in nuclei. Furthermore, the effect of energy loss for fast partons traversing nuclear medium could also be sensitively measured. If polarized proton beam becomes available at the 50-GeV PS, unique information on the sea-quark polarization could be obtained. Study of heavy quarkonium production at the 50-GeV PS can set important constraints on the mechanism of vector meson productions. Using a prototype dimuon spectrometer, we have simulated the sensitivities for a variety of measurements.

  9. Development of a low power, high mass range mass spectrometer for Mars surface analysis

    NASA Astrophysics Data System (ADS)

    Evans-Nguyen, Theresa; Becker, Luann; Doroshenko, Vladimir; Cotter, Robert J.

    2008-12-01

    A compact, low power quadrupole ion trap mass spectrometer is being developed that will achieve a mass range of 2000 Da at low voltage (0-300 V0-p) using a lower frequency fundamental voltage and supplemental excitation to very low qexcitation parameter. The instrument is a prototype for a spacecraft hardware design referred to as the Mars Organic Mass Analyzer (MOMA) that is currently scheduled for flight to Mars in 2013 as part of the European Space Agency ExoMars mission. MOMA is one of two "life detection" instruments that are being sponsored by NASA. MOMA will accommodate both an atmospheric pressure laser desorption ionization source that will provide direct sampling of core samples for the detection of organics over a broad mass range and an electron ionization source coupled to a gas chromatograph for the detection of atmospheric gases and specific biomarkers (e.g., amino acids, nucleobases, etc.). The instrument reported herein is an early prototype used to demonstrate the basic design concepts for a low power instrument with high mass range, including the use of supplemental frequency scans to record mass spectra. In addition, mass spectra are obtained using CO2 (the major constituent of the Mars atmosphere) as the bath gas, and a novel internal electron ionization source has been developed in which the electron beam enters through the ring electrode.

  10. NGC7538S - a High-Mass Protostar with a Massive Rotating Disk

    E-print Network

    G. Sandell; M. Wright; J. R. Forster

    2003-05-08

    We report the detection of a massive rotating disk around the high-mass Class 0 candidate NGC 7538S. The disk is well-resolved with BIMA (HPBW =3.7") in 3.4 mm continuum and in H13CN J = 1 - 0. It is seen nearly edge on and has a size of ~ 30,000 AU. A young, powerful outflow perpendicular to the rotating disk is mapped in SiO J = 2 - 1 and HCO+ J = 1 - 0. The dynamical age of the outflow is < 10,000 yr. The velocity gradient seen in H13CN is consistent with Keplerian rotation. Assuming that the gas is gravitationally bound, the mass of the central object is ~ 40 Msun. The mass of the continuum ``disk'' is <= 100 Msun and has a luminosity of 10^4 Lsun. H13CN gives a mass ~ 400 Msun for the rotating disk, and ~ 1000 Msun for the extended (20") envelope. Our observations confirm that this is an extremely massive protostar in its earliest stages.

  11. High Energy Studies of High Mass X-ray Binaries in the Small Magellanic Cloud

    NASA Astrophysics Data System (ADS)

    Townsend, Lee; Coe, M.; Corbet, R.; McBride, V.; Schurch, M.; Galache, J.; Hill, A.

    2010-02-01

    The Small Magellanic Cloud (SMC) is known to harbour a significant population of High Mass X-ray Binaries (HMXB), which are a direct result of recent tidal interactions triggering star birth in the galaxy. Using the Rossi X-ray Timing Explorer (RXTE), along with the INTEGRAL and Swift satellites, we have studied this growing population for more than 10 years. This has allowed the study of a large group of HMXBs without the difficulties of differing distances and extinctions that complicate Milky Way studies of such systems. In this paper we report on recent RXTE observations and describe the detailed behavior of some recently detected sources. In particular we discuss the newly discovered HMXB IGR J01054-7253, an 11.5s pulsar, and describe how intensive RXTE monitoring has allowed a complete orbital solution to be calculated for this object. We show that intensive monitoring of outbursting sources could prove to be an effective tool for determining orbital solutions to many systems in the SMC: we use the 8.8s pulsar RX J0051.8-7231, which has recently undergone the most luminous outburst ever seen in the SMC, and IGR J01054-7253 as examples of this. This work has been funded by the University of Southampton.

  12. Bimodality of Wind-fed Accretion in High Mass X-ray Binaries

    E-print Network

    Karino, S

    2014-01-01

    We study an influence of X-ray photo-ionization from an accreting neutron star in a high mass X-ray binary. Our aim is to unveil a new principle governing X-ray luminosities of X-ray binaries, with a simple analysis of fluid equations simulating line-driven wind flow under influence of X-ray irradiation. In this study, we solve equation of motion of the accretion flow taking into account the line-driven acceleration and X-ray photo-ionization. Under the influence of X-ray irradiation, we find the flow equations take two types of solutions. The first solution is characterized by a slow wind velocity which causes a large accretion rate. The second solution is a fast wind flow which results in a small accretion rate. We find that only the solution with a fast wind and faint X-ray luminosity is a steady solution. On the other hand, slow wind solution with a large X-ray luminosity is not a realizable solution. In bright X-ray binary systems, X-ray luminosity would increase until strong X-ray reduces the line-drive...

  13. Stellar wind in state transitions of high-mass X-ray binaries

    NASA Astrophysics Data System (ADS)

    ?echura, J.; Hadrava, P.

    2015-03-01

    Aims: We have developed a new code for the three-dimensional time-dependent raditation hydrodynamic simulation of the stellar wind in interacting binaries to improve models of accretion in high-mass X-ray binaries and to quantitatively clarify the observed variability of these objects. We used the code to test the influence of various parameters on the structure and properties of circumstellar matter. Methods: Our code takes into account acceleration of the wind due to the Roche effective potential, Coriolis force, gas pressure, and (CAK-) radiative pressure in the lines and continuum of the supergiant radiation field that is modulated by its gravity darkening and by the photo-ionization caused by X-ray radiation from the compact companion. The parameters of Cygnus X-1 were used to test the properties of our model. Results: Both two- and three-dimensional numerical simulations show that the Coriolis force substantially influences the mass loss and consequently the accretion rate onto the compact companion. The gravitational field of the compact companion focuses the stellar wind, which leads to the formation of a curved cone-like gaseous tail behind the companion. The changes of X-ray photo-ionization of the wind material during X-ray spectral-state transitions significantly influence the wind structure and offer an explanation of the variability of Cygnus X-1 in optical observations (the H? emission).

  14. Distribution of High Mass X-ray Binaries in the Milky Way

    NASA Astrophysics Data System (ADS)

    Coleiro, Alexis; Chaty, S.

    2013-04-01

    INTEGRAL observations have raised new questions about the evolution of High Mass X-ray Binaries (HMXBs) from their formation to the accretion stage in which these objects are detected in high energy. The number of detected HMXBs of different types is now high enough to allow us to carry out a statistical analysis of their distribution in the Milky Way. For the first time, we accurately derived the distance and absorption of a substantial sample of HMXBs by using a Spectral Energy Distribution fitting procedure. This study (ApJ in press) leads to a novel and accurate cartography of HMXBs in the Milky Way. Then, we examine the correlation with the distribution of Star Forming Complexes (SFCs) in the Galaxy. We will show that HMXBs are clustered with SFCs with a typical cluster size of 0.3 kpc and a characteristic distance between clusters of 1.7 kpc. Furthermore, we will present an investigation of the expected offset between the position of spiral arms and HMXBs, allowing us to constrain age and migration distance due to supernova kick for 13 sources. These new results, related to the first Herschel data of a sample of HMXBs will allow us to assess the influence of the environment on these high energy objects with unprecedented reliability.

  15. High-resolution CARMA Observations Of Two High-mass Cores In Orion

    NASA Astrophysics Data System (ADS)

    Chapman, Nicholas L.; Goldsmith, P. F.; Li, D.; Velusamy, T.

    2009-05-01

    The mechanisms for high-mass star formation are believed to be different from those for low-mass stars. To constrain these processes, we have an ongoing program to study massive quiescent cores in Orion (Li et al. 2003; Li et al. 2007; Velusamy et al. 2008). Based on single-dish 350 micron observations and also single-dish spectroscopy to estimate the temperature and degree of turbulence, Li et al. 2007 argued that many of these cores are supercritical, i.e. collapsing. We selected two of these possibly supercritical cores and observed them in N2H+ 1-0 using CARMA. N2H+ is believed to suffer less depletion than CO in the densest regions, making it an excellent molecule for tracing the dense core mass and gas dynamics. With our high resolution ( 1") observations, we resolve these cores into sub-structures, and model them in uv space to determine whether they are supercritical. This research was supported by the Jet Propulsion Laboratory, California Institute of Technology.

  16. OBSERVATIONS OF THE HIGH-MASS X-RAY BINARY A 0535+26 IN QUIESCENCE

    SciTech Connect

    Rothschild, Richard; Markowitz, Alex; Hemphill, Paul [University of California, San Diego, Center for Astrophysics and Space Sciences, 9500 Gilman Dr., La Jolla, CA 92093-0424 (United States); Caballero, Isabel [CEA Saclay, DSM/IRFU/SAp -UMR AIM (7158) CNRS/CEA/Universite P. Diderot, Orme des Merisiers, Bat. 709, F-91191 Gif-sur-Yvette (France); Pottschmidt, Katja [CRESST, UMBC, and NASA GSFC, Code 661, Greenbelt, MD 20771 (United States); Kuehnel, Matthias; Wilms, Joern [Dr. Karl-Remeis-Sternwarte and ECAP, Sternwartstr. 7, D-96049 Bamberg (Germany); Fuerst, Felix [Space Radiation Lab, MC 290-17 Cahill, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125 (United States); Doroshenko, Victor [Institut fuer Astronomie und Astrophysik, Universitaet Tuebingen, Sand 1, D-72076 Tuebingen (Germany); Camero-Arranz, Ascension, E-mail: rrothschild@ucsd.edu [Institut de Ciencies de l'Espai, (IEEC-CSIC), Campus UAB, Fac. de Ciencies, Torre C5, parell, 2a planta, E-08193 Barcelona (Spain)

    2013-06-10

    We have analyzed three observations of the high-mass X-ray binary A 0535+26 performed by the Rossi X-Ray Timing Explorer (RXTE) three, five, and six months after the last outburst in 2011 February. We detect pulsations only in the second observation. The 3-20 keV spectra can be fit equally well with either an absorbed power law or absorbed thermal bremsstrahlung model. Reanalysis of two earlier RXTE observations made 4 yr after the 1994 outburst, original BeppoSAX observations 2 yr later, reanalysis of four EXOSAT observations made 2 yr after the last 1984 outburst, and a recent XMM-Newton observation in 2012 reveal a stacked, quiescent flux level decreasing from {approx}2 to <1 Multiplication-Sign 10{sup -11} erg cm{sup -2} s{sup -1} over 6.5 yr after outburst. The detection of pulsations during half of the quiescent observations would imply that accretion onto the magnetic poles of the neutron star continues despite the fact that the circumstellar disk may no longer be present. The accretion could come from material built up at the corotation radius or from an isotropic stellar wind.

  17. CLUSTERING BETWEEN HIGH-MASS X-RAY BINARIES AND OB ASSOCIATIONS IN THE MILKY WAY

    SciTech Connect

    Bodaghee, A.; Tomsick, J. A. [Space Sciences Laboratory, 7 Gauss Way, University of California, Berkeley, CA 94720 (United States); Rodriguez, J. [Laboratoire AIM, CEA/IRFU, Universite Paris Diderot, CNRS/INSU, CEA DSM/IRFU/SAp, Centre de Saclay, F-91191 Gif-sur-Yvette (France); James, J. B., E-mail: bodaghee@ssl.berkeley.edu [Dark Cosmology Centre, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen (Denmark)

    2012-01-10

    We present the first direct measurement of the spatial cross-correlation function of high-mass X-ray binaries (HMXBs) and active OB star-forming complexes in the Milky Way. This result relied on a sample containing 79 hard X-ray-selected HMXBs and 458 OB associations. Clustering between the two populations is detected with a significance above 7{sigma} for distances <1 kpc. Thus, HMXBs closely trace the underlying distribution of the massive star-forming regions that are expected to produce the progenitor stars of HMXBs. The average offset of 0.4 {+-} 0.2 kpc between HMXBs and OB associations is consistent with being due to natal kicks at velocities of the order of 100 {+-} 50 km s{sup -1}. The characteristic scale of the correlation function suggests an average kinematical age (since the supernova phase) of {approx}4 Myr for the HMXB population. Despite being derived from a global view of our Galaxy, these signatures of HMXB evolution are consistent with theoretical expectations as well as observations of individual objects.

  18. Resonant Auger spectroscopy of metastable molecular oxygen

    SciTech Connect

    Farrokhpour, Hossein [Chemistry Department, Isfahan University of Technology, Isfahan 84154 (Iran, Islamic Republic of); Abdus Salam International Centre for Theoretical Physics, I-34014 Trieste (Italy); Alagia, Michele [CNR-ISMN Sez. Roma, P. le A. Moro 5, I-00185 Rome (Italy); CNR-Laboratorio Nazionale TASC-INFM, Area Science Park, I-34012 Basovizza, Trieste (Italy); Coreno, Marcello [CNR-IMIP, Montelibretti, I-00016 Rome (Italy); CNR-Laboratorio Nazionale TASC-INFM, Area Science Park, I-34012 Basovizza, Trieste (Italy); Unita INSTM, Universita degli Studi di Trieste (Italy); De Simone, Monica [CNR-Laboratorio Nazionale TASC-INFM, Area Science Park, I-34012 Basovizza, Trieste (Italy); Unita INSTM, Universita degli Studi di Trieste (Italy); Prince, Kevin C. [Sincrotrone Trieste, Area Science Park, I-34012 Basovizza, Trieste (Italy); CNR-Laboratorio Nazionale TASC-INFM, Area Science Park, I-34012 Basovizza, Trieste (Italy); Richter, Robert [Sincrotrone Trieste, Area Science Park, I-34012 Basovizza, Trieste (Italy); Stranges, Stefano [Dipartimento di Chimica, Universita di Roma 'La Sapienza', I-00185 Rome (Italy); Unita INSTM, Universita di Roma 'La Sapienza' (Italy); CNR-Laboratorio Nazionale TASC-INFM, Area Science Park, I-34012 Basovizza, Trieste (Italy); Tabrizchi, Mahmoud [Chemistry Department, Isfahan University of Technology, Isfahan 84154 (Iran, Islamic Republic of)

    2006-03-15

    Resonant Auger spectra following O 1s-{sup 1}{pi}{sub u} excitation of metastable oxygen a {sup 1}{delta}{sub g} molecules have been measured at high resolution under resonant Raman conditions. By selectively monitoring various decay channels, the singlet manifold excitation spectrum has been separated from the dominating triplet excitation. The decay spectra have been analyzed using the lifetime-vibrational-interference model to give the spectroscopic parameters of the 1s excited {sup 1}{pi}{sub u} state of O{sub 2}. Singlet and triplet manifold Auger decay rates are also compared.

  19. Tooth decay

    NSDL National Science Digital Library

    N/A N/A (None; )

    2005-05-21

    Teeth can decay and break or fall out of the gum line if they become damaged. One way in which they can be damaged is if dental plaque builds up on teeth. Plaque consists mostly of bacteria, and these bacteria cause cavities to be made in teeth if they are not removed on a regular basis.

  20. Radioactive Decay

    NSDL National Science Digital Library

    Barker, William

    Created by William Barker and David Smith for the Connected Curriculum Project, this module develops a mathematical model for decay of radioactive substances, and a technique for deciding whether quantitative data fits the model or not. This is one within a much larger set of learning modules hosted by Duke University.

  1. Radiative decays of dynamically generated charmed baryons

    SciTech Connect

    Gamermann, D.; Jimenez-Tejero, C. E.; Ramos, A. [Departament d'Estructura i Constituents de la Materia and Institut de Ciencies del Cosmos, Universitat de Barcelona, Avda. Diagonal 647, E-08028 Barcelona (Spain)

    2011-04-01

    In this work we study the radiative decay of dynamically generated J{sup P}=(1{sup -}/2) charm baryons into the ground state J{sup P}=(1{sup +}/2) baryons. Since different theoretical interpretations of these baryonic resonances and, in particular, of the {Lambda}{sub c}(2595), give different predictions, a precise experimental measurement of these decays would be an important step for understanding their nature.

  2. CP Violation in Other Bs Decays

    E-print Network

    L. Zhang; for the LHCb Collaboration

    2012-08-24

    The recent experimental results of CP violation in Bs decays other than in the J/psi phi final state are discussed. Included are the resonant components and $\\phi_s$ determination in Bs -> J/psi pi+ pi-, CP asymmetries in Bs -> h+ h'- decays, and the Bs effective lifetimes in the CP-even state K+ K- and the CP-odd state J/psi f0(980).

  3. The near-field acoustic levitation of high-mass rotors

    SciTech Connect

    Hong, Z. Y.; Lü, P.; Geng, D. L.; Zhai, W.; Yan, N.; Wei, B., E-mail: bbwei@nwpu.edu.cn [Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072 (China)

    2014-10-15

    Here we demonstrate that spherical rotors with 40 mm diameter and 0-1 kg mass can be suspended more than tens of micrometers away from an ultrasonically vibrating concave surface by near-field acoustic radiation force. Their rotating speeds exceed 3000 rpm. An acoustic model has been developed to evaluate the near-field acoustic radiation force and the resonant frequencies of levitation system. This technique has potential application in developing acoustic gyroscope.

  4. The near-field acoustic levitation of high-mass rotors.

    PubMed

    Hong, Z Y; Lü, P; Geng, D L; Zhai, W; Yan, N; Wei, B

    2014-10-01

    Here we demonstrate that spherical rotors with 40 mm diameter and 0-1 kg mass can be suspended more than tens of micrometers away from an ultrasonically vibrating concave surface by near-field acoustic radiation force. Their rotating speeds exceed 3000 rpm. An acoustic model has been developed to evaluate the near-field acoustic radiation force and the resonant frequencies of levitation system. This technique has potential application in developing acoustic gyroscope. PMID:25362441

  5. The near-field acoustic levitation of high-mass rotors

    NASA Astrophysics Data System (ADS)

    Hong, Z. Y.; Lü, P.; Geng, D. L.; Zhai, W.; Yan, N.; Wei, B.

    2014-10-01

    Here we demonstrate that spherical rotors with 40 mm diameter and 0-1 kg mass can be suspended more than tens of micrometers away from an ultrasonically vibrating concave surface by near-field acoustic radiation force. Their rotating speeds exceed 3000 rpm. An acoustic model has been developed to evaluate the near-field acoustic radiation force and the resonant frequencies of levitation system. This technique has potential application in developing acoustic gyroscope.

  6. Production and decays of D* mesons

    SciTech Connect

    Sadrozinski, H.F.W.

    1980-08-01

    Measurements of inclusive ..pi../sup 0/ and ..gamma.. production in e/sup +/e/sup -/ annihilation at c.m. energy E/sub c.m/ = 4.028 GeV with the Crystal Ball detector at SPEAR are reported. The decays D* ..-->.. ..pi../sup 0/D, D* ..-->.. ..gamma..D are observed and allow determination of the D*/sup 0/-D/sup 0/ mass difference, production ratio, and ..gamma../..pi../sup 0/ decay ratios. In addition, the resonance parameters of the psi''(3770) resonance are given. 5 figures, 1 table.

  7. Selected strong decay modes of Y(4260)

    NASA Astrophysics Data System (ADS)

    Dong, Yubing; Faessler, Amand; Gutsche, Thomas; Lyubovitskij, Valery E.

    2014-02-01

    In the present work the Y(4260) resonance is considered as a weakly bound state of a pseudoscalar D and an axial D1 charm meson. We consider the two-body decay Y(4260)?Zc(3900)±+??, where Zc(3900)± is treated as hadron molecule as well. Moreover we compute the Y(4260) decay modes J/??+?-, recently observed by the BESIII Collaboration, and ?(2S)?+?-. In the last process both the contact diagram with DD1??(nS)?+?- and the resonance diagram with DD1?Zc(3900)±+????(nS)?+?- are taken into account.

  8. INTEGRAL/IBIS observations of a hard X-ray outburst in high mass X-ray binary 4U 2206+54

    E-print Network

    Wang, W

    2010-01-01

    U 2206+54 is a wind-fed high mass X-ray binary with a main-sequence donor star. The nature of its compact object was recently identified as a slow-pulsation magnetized neutron star. INTEGRAL/IBIS observations have a long-term hard X-ray monitoring of 4U 2206+54 and detected a hard X-ray outburst around 15 December 2005 combined with the RXTE/ASM data.The hard X-ray outburst had a double-flare feature with a duration of $\\sim$ 2 days. The first flare showed a fast rise and long time decaying light curve about 15 hours with a peak luminosity of $\\sim 4\\times 10^{36}$ erg s$^{-1}$ from 1.5 -- 12 keV and a hard spectrum (only significantly seen above 5 keV). The second one had the mean hard X-ray luminosity of $1.3\\times 10^{36}$ erg s$^{-1}$ from 20 -- 150 keV with a modulation period at $\\sim 5550$ s which is the pulse period of the neutron star in 4U 2206+54; its hard X-ray spectrum from 20 -- 300 keV can be fitted with a broken power-law model with the photon indexes $\\Gamma_1 \\sim 2.3,\\ \\Gamma_2 \\sim 3.3$, a...

  9. MWC 297: a young high-mass star rotating at critical velocity

    E-print Network

    B. Acke; T. Verhoelst; M. E. van den Ancker; P. Deroo; C. Waelkens; O. Chesneau; E. Tatulli; M. Benisty; E. Puga; L. B. F. M. Waters; A. Verhoeff; A. de Koter

    2008-04-28

    MWC 297 is a young massive nearby B[e] star. The central star has a large projected rotational velocity of 350 km/s. Despite the wealth of published observations, the nature of this object and its dust-rich surroundings is not well understood. With the present paper, we shed light on the geometrical structure of the circumstellar matter which produces the near- to mid-infrared flux excess, and construct an overall image of the source's appearance and evolutionary status. The H-, K- and N-band brightness distribution of MWC 297 is probed with the ESO interferometric spectrographs AMBER and MIDI. We have obtained visibility measurements on 3 AMBER and 12 MIDI baselines, covering a wide range of spatial frequencies. We have reconstructed the brightness distribution in H, K and N with a geometric model consisting of three Gaussian disks with different extent and brightness temperature. This model can account for the entire near- to mid-IR emission of MWC 297. The near- and mid-IR emission, including the silicate emission at 10 micron, emanates from a very compact region (FWHM < 1.5 AU) around the central star. We argue that the circumstellar matter in the MWC 297 system is organized in a disk, seen under moderate (i < 40 deg) inclination. The disk displays no inner emission-free gap at the resolution of our interferometric data. The low inclination of the disk implies that the actual rotational velocity of the star exceeds its critical velocity. We discuss the impact of this result in terms of the formation of high-mass stars, and the main-sequence evolution of classical Be stars.

  10. Insights into the High-Mass X-ray Binary Population of the Magellanic Clouds

    NASA Astrophysics Data System (ADS)

    Antoniou, V.; Zezas, A.; Hatzidimitriou, D.; Kalogera, V.

    2013-09-01

    In contrast to the Small Magellanic Cloud (SMC), the Large Magellanic Cloud (LMC), our nearest starforming galaxy with metallicity between the Galaxy and the SMC, has received little attention in X-rays so far. With the aim to compare the accreting X-ray binary (XRB) populations in two of our nearest star-forming galaxies, we recently compiled the most complete census of high-mass X-ray binaries (HMXBs) in the LMC. We found 43 members of which 13 are XRB pulsars, while we also identified their most likely optical counterpart (previously, half of these sources lacked an identification). Using this census, we investigated the link between the young accreting XRBs and their parent stellar populations. It was known that HMXBs can be used as star-formation (SF) rate indicators, but these first studies have been focused only on bright systems (Galaxy: >1038 erg s-1, Magellanic Clouds: >1036 erg s-1) and SF values for the whole galaxy. By including Magellanic Cloud sources with X-ray luminosities at least two order of magnitudes fainter than the above limits and by utilizing the detailed, spatially resolved, SF history maps of these galaxies, we were able to provide observational constraints on ill-understood parameters related to their formation and evolution (such as the kick velocities imparted into the neutron star during the supernova explosion) and to derive their formation efficiency. This work was mainly supported by the National Aeronautics and Space Administration under Grant No. NNX10AH47G issued through the Astrophysics Data Analysis Program.

  11. Water in the envelopes and disks around young high-mass stars

    E-print Network

    Floris van der Tak; Malcolm Walmsley; Fabrice Herpin; Cecilia Ceccarelli

    2005-10-21

    Single-dish spectra and interferometric maps of (sub)mm lines of H2O-18 and HDO are used to study the chemistry of water in eight regions of high-mass star formation. The spectra indicate HDO excitation temperatures of ~110 K and column densities in an 11'' beam of ~2x10^14 cm^-2 for HDO and ~2x10^17 cm^-2 for H2O, with the N(HDO)/N(H2O) ratio increasing with decreasing temperature. Simultaneous observations of CH3OH and SO2 indicate that 20-50% of the single-dish line flux arises in the molecular outflows of these objects. The outflow contribution to the H2O-18 and HDO emission is estimated to be 10-20%. Radiative transfer models indicate that the water abundance is low (~10^-6) outside a critical radius corresponding to a temperature in the protostellar envelope of ~100 K, and `jumps' to H2O/H2 ~ 10^-4 inside this radius. This value corresponds to the observed abundance of solid water and together with the derived HDO/H2O abundance ratios of ~1/1000 suggests that the origin of the observed water is evaporation of grain mantles. This idea is confirmed in the case of AFGL 2591 by interferometer observations of HDO, H2O-18 and SO2 lines, which reveal compact (~800 AU) emission with a systematic velocity gradient. This size is similar to that of the 1.3 mm continuum towards AFGL 2591, from which we estimate a mass of ~0.8 M0, or ~5% of the mass of the central star. We speculate that we may be observing a circumstellar disk in an almost face-on orientation.

  12. NIR And MIR Emission From The Central High-mass Protostar In IRAS19410

    NASA Astrophysics Data System (ADS)

    Campbell, Murray F.; Sridharan, T. K.; De Buizer, J. M.; Kassis, M.; Whitney, B.; Hora, J. L.; Beuther, H.; Eshelman, E.; Moriarty, J. C.; Towner, A. P.; Saito, M.

    2010-01-01

    We present IRTF-MIRSI photometry and a grism spectrum, IRAC photometry, and high-resolution Gemini mid-IR images of IRAS 19410+2336 mm1, a member of a rich cluster of mm cores located in one of the candidate regions of high-mass star formation identified by Sridharan et al. (2002). The Gemini images show a bipolar-like pair of IR sources separated by 0.7" that straddle the PdBI mm1 core (Beuther et al. 2004). They align well with one of the multiple outflows in the mm complex (Qui et al. 2008), suggesting that they may be images of hot dust emission from the upper and lower surfaces of a single accretion disk seen almost edge-on, and/or upper and lower surfaces of bipolar outflow cavities in an accreting envelope. We discuss initial Monte Carlo models of the SED and images at the near distance of 2.1 kpc computed at Colby with the Whitney et al. (2004) code, and models from the SED library of Robitaille et al. (2007). Fitting all of the near-IR to mid-IR photometric, spectral, and image data of the pair as a bipolar source heated by a central YSO or as separate objects is proving difficult, but the huge parameter spaces have not been fully explored. Beuther, et al. 2004, Science, 303, 1167; Qiu, K et al 2008, ApJ 685,1005; Robitaille, et al. 2007, ApJS, 167, 256; Sridharan, et al. 2002, ApJ, 566, 931; Whitney, et al, 2003, ApJ, 591, 1049.

  13. A High-Mass Protobinary System in the Hot Core W3(H2O)

    E-print Network

    Huei-Ru Chen; William J. Welch; David J. Wilner; Edmund C. Sutton

    2005-11-10

    We have observed a high-mass protobinary system in the hot core W3(H2O) with the BIMA Array. Our continuum maps at wavelengths of 1.4mm and 2.8mm both achieve sub-arcsecond angular resolutions and show a double-peaked morphology. The angular separation of the two sources is 1.19" corresponding to 2.43X10^3 AU at the source distance of 2.04 kpc. The flux densities of the two sources at 1.4mm and 2.8mm have a spectral index of 3, translating to an opacity law of kappa ~ nu. The small spectral indices suggest that grain growth has begun in the hot core. We have also observed 5 K components of the CH3CN (12-11) transitions. A radial velocity difference of 2.81 km/s is found towards the two continuum peaks. Interpreting these two sources as binary components in orbit about one another, we find a minimum mass of 22 Msun for the system. Radiative transfer models are constructed to explain both the continuum and methyl cyanide line observations of each source. Power-law distributions of both density and temperature are derived. Density distributions close to the free-fall value, r^-1.5, are found for both components, suggesting continuing accretion. The derived luminosities suggest the two sources have equivalent zero-age main sequence (ZAMS) spectral type B0.5 - B0. The nebular masses derived from the continuum observations are about 5 Msun for source A and 4 Msun for source C. A velocity gradient previously detected may be explained by unresolved binary rotation with a small velocity difference.

  14. WATER ICE IN HIGH MASS-LOSS RATE OH/IR STARS

    SciTech Connect

    Suh, Kyung-Won; Kwon, Young-Joo, E-mail: kwsuh@chungbuk.ac.kr [Department of Astronomy and Space Science, Chungbuk National University, Cheongju-City 361-763 (Korea, Republic of)] [Department of Astronomy and Space Science, Chungbuk National University, Cheongju-City 361-763 (Korea, Republic of)

    2013-01-10

    We investigate water-ice features in spectral energy distributions (SEDs) of high mass-loss rate OH/IR stars. We use a radiative transfer code which can consider multiple components of dust shells to make model calculations for various dust species including water ice in the OH/IR stars. We find that the model SEDs are sensitively dependent on the location of the water-ice dust shell. For two sample stars (OH 127.8+0.0 and OH 26.5+0.6), we compare the detailed model results with the infrared observational data including the spectral data from the Infrared Space Observatory (ISO). For the two sample stars, we reproduce the crystalline water-ice features (absorption at 3.1 {mu}m and 11.5 {mu}m; emission at 44 and 62 {mu}m) observed by ISO using a separate component of the water-ice dust shell that condensed at about 84-87 K (r {approx} 1500-1800 AU) as well as the silicate dust shell that condensed at about 1000 K (r {approx} 19-25 AU). For a sample of 1533 OH/IR stars, we present infrared two-color diagrams (2CDs) using the Infrared Astronomical Satellite and AKARI data compared with theoretical model results. We find that the theoretical models clearly show the effects of the crystalline water-ice features (absorption at 11.5 {mu}m and emission at 62 {mu}m) on the 2CDs.

  15. An XMM-Newton view of FeK? in High Mass X-rays Binaries

    NASA Astrophysics Data System (ADS)

    Giménez-García, A.; Torrejón, J. M.; Eikmann, W.; Martínez-Núñez, S.; Oskinova, L. M.; Rodes-Roca, J. J.; Bernabéu, G.

    2015-05-01

    We present a comprehensive analysis of the whole sample of available XMM-Newton observations of High Mass X-ray Binaries (HMXBs) until August, 2013, focusing on the FeK? emission line. This line is a key tool to better understand the physical properties of the material surrounding the X-ray source within a few stellar radii (the circumstellar medium). We have collected observations from 46 HMXBs, detecting FeK? in 21 of them. We have used the standard classification of HMXBs to divide the sample in different groups. We find that: (1) FeK? is centred at a mean value of 6.42 keV. Considering the instrumental and fits uncertainties, this value is compatible with ionization states lower than Fe XVIII. (2) The flux of the continuum is well correlated with the flux of the line, as expected. Eclipse observations show that the Fe fluorescence emission comes from an extended region surrounding the X-ray source. (3) FeK? is narrow (?_{line}<0.15 keV), reflecting that the reprocessing material does not move at high speeds. We attempt to explain the broadness of the line in terms of three possible broadening phenomena: line blending, Compton scattering and Doppler shifts (with velocities of the reprocessing material V ˜ 1000 km/s). (4) The equivalent hydrogen column (N_H) directly correlates with the EW of FeK?, displaying clear similarities to numerical simulations. It highlights the strong link between the absorbing and the fluorescent matter. The obtained results clearly point to a very important contribution of the donor's wind in the FeK? emission and the absorption when the donor is a supergiant massive star.

  16. High-mass X-ray binary populations. 1: Galactic modeling

    NASA Technical Reports Server (NTRS)

    Dalton, William W.; Sarazin, Craig L.

    1995-01-01

    Modern stellar evolutionary tracks are used to calculate the evolution of a very large number of massive binary star systems (M(sub tot) greater than or = 15 solar mass) which cover a wide range of total masses, mass ratios, and starting separations. Each binary is evolved accounting for mass and angular momentum loss through the supernova of the primary to the X-ray binary phase. Using the observed rate of star formation in our Galaxy and the properties of massive binaries, we calculate the expected high-mass X-ray binary (HMXRB) population in the Galaxy. We test various massive binary evolutionary scenarios by comparing the resulting HMXRB predictions with the X-ray observations. A major goal of this study is the determination of the fraction of matter lost from the system during the Roche lobe overflow phase. Curiously, we find that the total numbers of observable HMXRBs are nearly independent of this assumed mass-loss fraction, with any of the values tested here giving acceptable agreement between predicted and observed numbers. However, comparison of the period distribution of our HMXRB models with the observed period distribution does reveal a distinction among the various models. As a result of this comparison, we conclude that approximately 70% of the overflow matter is lost from a massive binary system during mass transfer in the Roche lobe overflow phase. We compare models constructed assuming that all X-ray emission is due to accretion onto the compact object from the donor star's wind with models that incorporate a simplified disk accretion scheme. By comparing the results of these models with observations, we conclude that the formation of disks in HMXRBs must be relatively common. We also calculate the rate of formation of double degenerate binaries, high velocity detached compact objects, and Thorne-Zytkow objects.

  17. The Sensitivity of HAWC to High-Mass Dark Matter Annihilations

    E-print Network

    A. U. Abeysekara; R. Alfaro; C. Alvarez; J. D. Alvarez; R. Arceo; J. C. Arteaga-Velazquez; H. A. Ayala Solares; A. S. Barber; B. M. Baughman; N. Bautista-Elivar; J. Becerra Gonzalez; E. Belmont; S. Y. BenZvi; D. Berley; M. Bonilla Rosales; J. Braun; R. A. Caballero-Lopez; K. S. Caballero-Mora; A. Carraminana; M. Castillo; U. Cotti; J. Cotzomi; E. de la Fuente; C. De Leon; T. DeYoung; R. Diaz Hernandez; L. Diaz-Cruz; J. C. Diaz-Velez; B. L. Dingus; M. A. DuVernois; R. W. Ellsworth; S. F. E.; D. W. Fiorino; N. Fraija; A. Galindo; F. Garfias; M. M. Gonzalez; J. A. Goodman; V. Grabski; M. Gussert; Z. Hampel-Arias; J. P. Harding; C. M. Hui; P. Huentemeyer; A. Imran; A. Iriarte; P. Karn; D. Kieda; G. J. Kunde; A. Lara; R. J. Lauer; W. H. Lee; D. Lennarz; H. Leon Vargas; E. C. Linares; J. T. Linnemann; M. Longo; R. Luna-Garcia; A. Marinelli; H. Martinez; O. Martinez; J. Martinez-Castro; J. A. J. Matthews; J. McEnery; E. Mendoza Torres; P. Miranda-Romagnoli; E. Moreno; M. Mostafa; L. Nellen; M. Newbold; R. Noriega-Papaqui; T. Oceguera-Becerra; B. Patricelli; R. Pelayo; E. G. Perez-Perez; J. Pretz; C. Riviere; D. Rosa-Gonzalez; J. Ryan; H. Salazar; F. Salesa; A. Sandoval; M. Schneider; S. Silich; G. Sinnis; A. J. Smith; K. Sparks Woodle; R. W. Springer; I. Taboada; P. A. Toale; K. Tollefson; I. Torres; T. N. Ukwatta; L. Villasenor; T. Weisgarber; S. Westerhoff; I. G. Wisher; J. Wood; G. B. Yodh; P. W. Younk; D. Zaborov; A. Zepeda; H. Zhou; K. N. Abazajian

    2014-12-09

    The High Altitude Water Cherenkov (HAWC) observatory is a wide field-of-view detector sensitive to gamma rays of 100 GeV to a few hundred TeV. Located in central Mexico at 19 degrees North latitude and 4100 m above sea level, HAWC will observe gamma rays and cosmic rays with an array of water Cherenkov detectors. The full HAWC array is scheduled to be operational in Spring 2015. In this paper, we study the HAWC sensitivity to the gamma-ray signatures of high-mass (multi- TeV) dark matter annihilation. The HAWC observatory will be sensitive to diverse searches for dark matter annihilation, including annihilation from extended dark matter sources, the diffuse gamma-ray emission from dark matter annihilation, and gamma-ray emission from non-luminous dark matter subhalos. Here we consider the HAWC sensitivity to a subset of these sources, including dwarf galaxies, the M31 galaxy, the Virgo cluster, and the Galactic center. We simulate the HAWC response to gamma rays from these sources in several well-motivated dark matter annihilation channels. If no gamma-ray excess is observed, we show the limits HAWC can place on the dark matter cross-section from these sources. In particular, in the case of dark matter annihilation into gauge bosons, HAWC will be able to detect a narrow range of dark matter masses to cross-sections below thermal. HAWC should also be sensitive to non-thermal cross-sections for masses up to nearly 1000 TeV. The constraints placed by HAWC on the dark matter cross-section from known sources should be competitive with current limits in the mass range where HAWC has similar sensitivity. HAWC can additionally explore higher dark matter masses than are currently constrained.

  18. Observation of the Decay B-?Ds(*)+K-?-?? ?

    E-print Network

    Fisher, Peter H.

    We report the observation of the decay B[superscript -]?D[subscript s][superscript (*)+]K[superscript -]?[superscript -]?? ? based on 342??fb[superscript -1] of data collected at the ?(4S) resonance with the BABAR detector ...

  19. Observation of the Resonant Character of the Z(4430)[superscript ?] State

    E-print Network

    Counts, Ian Thomas Hunt

    Resonant structures in B[superscript 0] ? ?[superscript ?]?[superscript ?]K[superscript +] decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to ...

  20. Chiral Light-Matter Interaction in Optical Resonators

    NASA Astrophysics Data System (ADS)

    Yoo, SeokJae; Park, Q.-Han

    2015-05-01

    The Purcell effect explains the modification of the spontaneous decay rate of quantum emitters in a resonant cavity. For quantum emitters such as chiral molecules, however, the cavity modification of the spontaneous decay rate has been little known. Here we extend Purcell's work to the chiral light-matter interaction in optical resonators and find the differential spontaneous decay rate of chiral molecules coupled to left and right circularly polarized resonator modes. We determine the chiral Purcell factor, which characterizes the ability of optical resonators to enhance chiroptical signals, by the quality factor and the chiral mode volume of a resonator, representing, respectively, the temporal confinement of light and the spatial confinement of the helicity of light. We show that the chiral Purcell effect can be applied to chiroptical spectroscopy. Specifically, we propose a realistic scheme to achieve resonator enhanced chiroptical spectroscopy that uses the double fishnet structure as a nanoscale cuvette supporting the chiral Purcell effect.

  1. Quantum interference of particles and resonances

    E-print Network

    Ya. Azimov

    2010-02-09

    Though the phenomenon of quantum-mechanical interference has been known for many years, it still has many open questions. The present review discusses specifically how the interference of resonances may and does work. We collect data on the search for rare decay modes of well-known resonances that demonstrate a wide variety of possible different manifestations of interference. Some special kinds of resonance interference, not yet sufficiently studied and understood, are also briefly considered. The interference may give useful experimental procedures to search for new resonances with arbitrary quantum numbers, even with exotic ones, and to investigate their properties.

  2. Bayesian analysis for two-parameter hybrid EoS with high-mass compact star twins

    E-print Network

    Alvarez-Castillo, David E; Blaschke, David; Grigorian, Hovik

    2015-01-01

    We perform a Bayesian analysis in the basis of a recently developed two-parameter class of hybrid equations of state that allow for high-mass compact star twins. While recently a wide range of radii, from 9 - 15 km, has been inferred for different neutron stars using different techniques, we perform our analysis under the supposition that the radii are towards the large end ($13-15$ km). We use this radius constraint together with the undebated statistically independent constraint for high masses ($\\sim 2~M_\\odot$) as priors in selecting the most probable hybrid equations of state from a family with two free parameters: the baryon excluded volume in the hadronic phase and the 8-quark vector channel interaction in the quark matter phase.

  3. Far-infrared molecular lines from low- to high-mass star forming regions observed with Herschel

    NASA Astrophysics Data System (ADS)

    Karska, A.; Herpin, F.; Bruderer, S.; Goicoechea, J. R.; Herczeg, G. J.; van Dishoeck, E. F.; San José-García, I.; Contursi, A.; Feuchtgruber, H.; Fedele, D.; Baudry, A.; Braine, J.; Chavarría, L.; Cernicharo, J.; van der Tak, F. F. S.; Wyrowski, F.

    2014-02-01

    Aims: Our aim is to study the response of the gas-to-energetic processes associated with high-mass star formation and compare it with previously published studies on low- and intermediate-mass young stellar objects (YSOs) using the same methods. The quantified far-IR line emission and absorption of CO, H2O, OH, and [O i] reveals the excitation and the relative contribution of different atomic and molecular species to the gas cooling budget. Methods: Herschel/PACS spectra covering 55-190 ?m are analyzed for ten high-mass star forming regions of luminosities Lbol ~ 104-106 L? and various evolutionary stages on spatial scales of ~104 AU. Radiative transfer models are used to determine the contribution of the quiescent envelope to the far-IR CO emission. Results: The close environments of high-mass protostars show strong far-IR emission from molecules, atoms, and ions. Water is detected in all 10 objects even up to high excitation lines, often in absorption at the shorter wavelengths and in emission at the longer wavelengths. CO transitions from J = 14 - 13 up to typically 29 - 28 (Eu/kB ~ 580-2400 K) show a single temperature component with a rotational temperature of Trot ~ 300 K. Typical H2O excitation temperatures are Trot ~250 K, while OH has Trot ~ 80 K. Far-IR line cooling is dominated by CO (~75%) and, to a smaller extent, by [O i] (~20%), which becomes more important for the most evolved sources. H2O is less important as a coolant for high-mass sources because many lines are in absorption. Conclusions: Emission from the quiescent envelope is responsible for ~45-85% of the total CO luminosity in high-mass sources compared with only ~10% for low-mass YSOs. The highest- J lines (Jup ? 20) originate most likely in shocks, based on the strong correlation of CO and H2O with physical parameters (Lbol, Menv) of the sources from low- to high-mass YSOs. The excitation of warm CO described by Trot ~ 300 K is very similar for all mass regimes, whereas H2O temperatures are ~100 K high for high-mass sources compared with low-mass YSOs. The total far-IR cooling in lines correlates strongly with bolometric luminosity, consistent with previous studies restricted to low-mass YSOs. Molecular cooling (CO, H2O, and OH) is ~4 times greater than cooling by oxygen atoms for all mass regimes. The total far-IR line luminosity is about 10-3 and 10-5 times lower than the dust luminosity for the low- and high-mass star forming regions, respectively. Appendices are available in electronic form at http://www.aanda.org

  4. The structure of blue supergiant winds and the accretion in supergiant high-mass X-ray binaries

    Microsoft Academic Search

    L. Ducci; L. Sidoli; S. Mereghetti; A. Paizis; P. Romano

    2009-01-01

    We have developed a stellar wind model for OB supergiants to investigate the effects of accretion from a clumpy wind on the luminosity and variability properties of high-mass X-ray binaries. Assuming that the clumps are confined by ram pressure of the ambient gas and exploring different distributions for their mass and radii, we computed the expected X-ray light curves in

  5. Search for Resonant Pair Production of long-lived particles decaying to b anti-b in p anti-p collisions at s**(1/2) = 1.96-TeV

    SciTech Connect

    Abazov, V.M.; /Dubna, JINR; Abbott, B.; /Oklahoma U.; Abolins, M.; /Michigan State U.; Acharya, B.S.; /Tata Inst.; Adams, M.; /Illinois U., Chicago; Adams, T.; /Florida State U.; Aguilo, E.; /Alberta U. /Simon Fraser U. /York U., Canada /McGill U.; Ahsan, M.; /Kansas State U.; Alexeev, G.D.; /Dubna, JINR; Alkhazov, G.; /St. Petersburg, INP; Alton, A.; /Michigan U. /Northeastern U.

    2009-06-01

    We report on a first search for production of Higgs bosons decaying into neutral long-lived particles (NLLP) which each decay to a b{bar b} pair, using 3.6 fb{sup -1} of data recorded with the D0 detector at the Fermilab Tevatron collider. We search for pairs of displaced vertices in the tracking detector at radii in the range 1.6-20 cm from the beam axis. No significant excess is observed above background, and upper limits are set on the production rate in a hidden-valley benchmark model for a range of Higgs boson masses and NLLP masses and lifetimes.

  6. Optical resonator

    NASA Technical Reports Server (NTRS)

    Taghavi-Larigani, Shervin (Inventor); Vanzyl, Jakob J. (Inventor); Yariv, Amnon (Inventor)

    2006-01-01

    The invention discloses a semi-ring Fabry-Perot (SRFP) optical resonator structure comprising a medium including an edge forming a reflective facet and a waveguide within the medium, the waveguide having opposing ends formed by the reflective facet. The performance of the SRFP resonator can be further enhanced by including a Mach-Zehnder interferometer in the waveguide on one side of the gain medium. The optical resonator can be employed in a variety of optical devices. Laser structures using at least one SRFP resonator are disclosed where the resonators are disposed on opposite sides of a gain medium. Other laser structures employing one or more resonators on one side of a gain region are also disclosed.

  7. High-mass Star Formation Triggered by Collision between CO Filaments in N159 West in the Large Magellanic Cloud

    NASA Astrophysics Data System (ADS)

    Fukui, Yasuo; Harada, Ryohei; Tokuda, Kazuki; Morioka, Yuuki; Onishi, Toshikazu; Torii, Kazufumi; Ohama, Akio; Hattori, Yusuke; Nayak, Omnarayani; Meixner, Margaret; Sewi?o, Marta; Indebetouw, Remy; Kawamura, Akiko; Saigo, Kazuya; Yamamoto, Hiroaki; Tachihara, Kengo; Minamidani, Tetsuhiro; Inoue, Tsuyoshi; Madden, Suzanna; Galametz, Maud; Lebouteiller, Vianney; Mizuno, Norikazu; Chen, C.-H. Rosie

    2015-07-01

    We have carried out 13CO(J = 2–1) observations of the active star-forming region N159 west in the Large Magellanic Cloud with ALMA. We have found that the CO distribution at a sub-parsec scale is highly elongated with a small width. These elongated clouds called “filaments” show straight or curved distributions with a typical width of 0.5–1.0 pc and a length of 5–10 pc. All the known infrared young stellar objects are located toward the filaments. We have found broad CO wings of two molecular outflows toward young high-mass stars in N159W-N and N159W-S, whose dynamical timescale is ?104 years. This is the first discovery of protostellar outflow in external galaxies. For N159W-S, which is located toward an intersection of two filaments, we set up a hypothesis that the two filaments collided with each other ?105 years ago and triggered the formation of the high-mass star having ?37 {M}? . The colliding clouds show significant enhancement in linewidth in the intersection, suggesting excitation of turbulence in the shocked interface layer between them, as is consistent with the magnetohydrodynamical numerical simulations. This turbulence increases the mass accretion rate to ? 6× {10}-4 {M}? yr?1, which is required to overcome the stellar feedback to form the high-mass star.

  8. CP-tagged charm decays: relevance, status and prospects

    E-print Network

    Guy Wilkinson

    2009-10-05

    The analysis of quantum-correlated $D-\\bar{D}$ decays produced at the $\\psi(3770)$ resonance gives unique insight into quantities such as strong-phase differences and coherence factors. Knowledge of these parameters is invaluable for measurements of the CKM-angle $\\gamma$ ($\\phi_3$) in $B \\to DK$ decays. Results from CLEO-c analyses performed at the $\\psi(3770)$ resonance in a variety of decay channels are reported, and their consequences for the determination of $\\gamma$ is assessed. Future prospects are given for extensions to the present studies.

  9. Harmonic generation and parametric decay in the ion cyclotron frequency range

    SciTech Connect

    Skiff, F.N.; Wong, K.L.; Ono, M.

    1984-06-01

    Harmonic generation and parametric decay are examined in a toroidal ACT-I plasma using electrostatic plate antennas. The harmonic generation, which is consistent with sheath rectification, is sufficiently strong that the nonlinearly generated harmonic modes themselves decay parametrically. Resonant and nonresonant parametric decay of the second harmonic are observed and compared with uniform pump theory. Resonant decay of lower hybrid waves into lower hybrid waves and slow ion cyclotron waves is seen for the first time. Surprisingly, the decay processes are nonlinearly saturated, indicating absolute instability.

  10. Fano resonance formula for lossy two-port systems.

    PubMed

    Yoon, Jae Woong; Magnusson, Robert

    2013-07-29

    We provide a modified Fano resonance formula applicable to dissipative two-port resonance systems. Based on a generic coupled-resonator model, the formula embodies loss-related correction terms and fundamental resonance parameters that can be determined by an analytic method or experimentally as opposed to finding phenomenological parameters by fitting to numerical results. The theory applies physically meaningful resonance parameters including resonance frequency, total decay rates, and partial radiation probabilities. For example, it shows that the classic Fano shape parameter q is given directly in terms of the phase difference between the resonant and non-resonant transmission pathways. Our new resonance formula quantitatively expresses the resonance spectra pertaining to modal nanophotonic and surface-plasmonic thin-film structures as verified by comparing with exact numerical models. PMID:23938648

  11. A Search for New Physics with High Mass Tau Pairs in proton anti-proton collisions at s**(1/2) = 1.96-TeV at CDF

    SciTech Connect

    Wan, Zong-ru

    2005-04-01

    We present the results of a search for new particles decaying to tau pairs using the data corresponding to an integrated luminosity of 195 pb{sup -1} collected from March 2002 to September 2003 with the CDF detector at the Tevatron. Hypothetical particles, such as Z' and MSSM Higgs bosons can potentially produce the tau pair final state. We discuss the method of tau identification, and show the signal acceptance versus new particle mass. The low-mass region, dominated by Z {yields} {tau}{tau}, is used as a control region. In the high-mass region, we expect 2.8 {+-} 0.5 events from known background sources, and observe 4 events in the data sample. Thus no significant excess is observed, and we set upper limits on the cross section times branching ratio as a function of the masses of heavy scalar and vector particles.

  12. Phenomenological analysis of nonresonant charm meson decays

    SciTech Connect

    Bediaga, I.; Goebel, C. [Centro Brasileiro de Pesquisas Fisicas, R. Dr. Xavier Sigaud 150 22290-180, Rio de Janeiro, RJ (Brazil)] [Centro Brasileiro de Pesquisas Fisicas, R. Dr. Xavier Sigaud 150 22290-180, Rio de Janeiro, RJ (Brazil); Mendez-Galain, R. [Instituto de Fisica, Facultad de Ingenieria, CC 30, CP 11000 Montevideo (Uruguay)] [Instituto de Fisica, Facultad de Ingenieria, CC 30, CP 11000 Montevideo (Uruguay)

    1997-10-01

    We analyze the consequences of the usual assumption of a constant function to fit nonresonant decays from an experimental Dalitz plot describing charmed meson decays. We first show, using the D{sup +}{r_arrow}{bar K}{sup 0}{pi}{sup +}{pi}{sup 0} decay channel as an example, how an inadequate extraction of the nonresonant contribution could yield incorrect measurements for the resonant channels. We analyze how the correct study of this decay will provide a test for the validity of factorization in D meson decays. Finally, we show how form factors could be extracted from nonresonant decays. In particular, we discuss the form factor that can be measured from the D{sub s}{sup +}{r_arrow}{pi}{sup {minus} }{pi}{sup +}{pi}{sup +} decay. We emphasize its relevance for the study of the decay {tau}{r_arrow}{nu}{sub {tau}}3{pi} and the extraction of the a{sub 1} meson width. {copyright} {ital 1997} {ital The American Physical Society}

  13. Radioactive Decay Calculator

    NSDL National Science Digital Library

    Alan Enns

    This online calculator computes radioactive decay, timed decay, and timed solid disposal for a databank containing 116 isotopes. It also features University of British Columbia disposal limits and a unit converter and date/time calculators. These tools calculate the half-life for selected isotopes; radioactive decay final activity, given the initial activity and decay time; the decay time, given the initial and final activities; and the decay time, given the mass of a solid and the initial activity.

  14. Exotic weak decays of atomic nuclei

    NASA Astrophysics Data System (ADS)

    Suhonen, Jouni

    2012-10-01

    The two-neutrino (2? 2?) and neutrinoless (0? 2?) double beta decays are studied with respect to the associated nuclear matrix elements (NMEs). It is assumed that the 0? 2? decay proceeds through the exchange of a Majorana neutrino with non-zero effective mass. In this so called mass mode both the ground-state and excited-state decays are discussed. For the 0? 2?- mode the NMEs computed by the Yale group (using IBA-2) and the Jyväskylä group (using the QRPA) are compared. The positron emitting/electron capture modes, ?+?+, ?+ EC, and ECEC, are discussed also. Particular attention is devoted to the study of the detectability of the resonant neutrinoless double electron capture (R0?ECEC) processes in potential candidate nuclei. As an example, the decays of 96Ru are reviewed.

  15. The decay of highly excited open strings

    NASA Technical Reports Server (NTRS)

    Mitchell, D.; Turok, N.; Wilkinson, R.; Jetzer, P.

    1988-01-01

    The decay rates of leading edge Regge trajectory states are calculated for very high level number in open bosonic string theories, ignoring tachyon final states. The optical theorem simplifies the analysis while enabling identification of the different mass level decay channels. The main result is that (in four dimensions) the greatest single channel is the emission of a single photon and a state of the next mass level down. A simple asymptotic formula for arbitrarily high level number is given for this process. Also calculated is the total decay rate exactly up to N=100. It shows little variation over this range but appears to decrease for larger N. The formalism is checked in examples and the decay rate of the first excited level calculated for open superstring theories. The calculation may also have implications for high spin meson resonances.

  16. Excitation curve for auger decay of the (1S2S2P sup 2 ) sup 3 D state of C sup 4+ formed through RTE (Resonant Transfer and Excitation)

    Microsoft Academic Search

    S. M. Shafroth; F. McDonald; M. Benhenni; Q. Kessel; E. Deveney; J. K. Swenson; M. Schulz; J. P. Giese; H. Schoene; S. Datz; P. F. Dittner; H. F. Krause; C. R. Vane; N. Jones; U. Bechthold; L. D. Hendrick; D. M. Peterson

    1990-01-01

    The ORNL EN tandem supplied beams of 3.5--9 MeV C{sup 3+} ions which were incident on a differentially pumped He target. Auger electrons emitted by fast C{sup 4+} ions emerged at 10 deg(lab)w.r.t. the incident ion beam. They were detected using a two stage spectrometer with kinematic refocusing. An excitation curve was obtained for the (1s2s2p)³D state Auger decay to

  17. Signs of baryon-resonance photocouplings

    Microsoft Academic Search

    John Babcock; Jonathan L. Rosner

    1978-01-01

    New baryon-resonance photocouplings from an analysis of Barbour, Crawford, and Parsons are analyzed from the standpoint of single-quark-transition selection rules. A previous conclusion is strengthened: The pionic decays of 56, L=2 resonances appear from this analysis to be dominated by DeltaLz=+\\/-1 transitions, in contrast to the conclusion that would be drawn from analysis of piN-->piDelta. Both P13(1810) and F35(1890) photocouplings

  18. Surface polarization dynamics revealed by time-resolved resonant reflection of light

    Microsoft Academic Search

    I. Reimand; J. Aaviksoo

    1991-01-01

    We have analysed the temporal response function of a reflecting surface near an exciton resonance. The reflected pulse is shown to contain an ultrafast component due to the nonresonant polarization, approximated by ?0, and a transient response, which follows the decay of the resonant polarization induced by the incident pulse. Three quasi-independent mechanisms are shown to contribute to this decay:

  19. Polarization effects in radiative decay of a polarized ? lepton

    NASA Astrophysics Data System (ADS)

    Gakh, G. I.; Konchatnij, M. I.; Korchin, A. Yu.; Merenkov, N. P.

    2015-02-01

    The polarization effects in the one-meson radiative decay of a polarized ? lepton, ? ? ?-???, are investigated. The inner bremsstrahlung and structural amplitudes are taken into account. The asymmetry of the differential decay width caused by the ?-lepton polarization and the Stokes parameters of the emitted photon itself are calculated depending on the polarization of the decaying ? lepton. These physical quantities are estimated numerically for an arbitrary direction of the ? lepton polarization 3-vector in the rest frame. The vector and axial-vector form factors describing the structure-dependent part of the decay amplitude are determined using the chiral effective theory with resonances (R?T).

  20. ?- decay of the neutron-rich isotope 215Pb

    NASA Astrophysics Data System (ADS)

    De Witte, H.; Eeckhaudt, S.; Andreyev, A. N.; Borzov, I. N.; Cederkäll, J.; De Smet, A.; Fedorov, D. V.; Fedoseyev, V. N.; Franchoo, S.; Górska, M.; Grawe, H.; Huber, G.; Huyse, M.; Janas, Z.; Köster, U.; Kurcewicz, W.; Kurpeta, J.; P?ochocki, A.; Van de Vel, K.; Van Duppen, P.; Weissman, L.

    2013-06-01

    This Brief Report reports on the first observation of the ?--delayed ? decay of 215Pb, feeding states in 215Bi. The 215Pb beam was produced using resonant laser ionization and mass separated at the ISOLDE-CERN on-line mass separator. This ensured clean identification of the ? rays as belonging to the decay of 215Pb or its ?-decay daughters. A half-life of 147(12) s was measured for the 215Pb ? decay and a level scheme for the daughter nucleus 215Bi is proposed, resulting in an extended systematics of the excited states of the neutron-rich Bi isotopes.

  1. Observation of Ground-State Two-Neutron Decay

    E-print Network

    Thoennessen, M; Spyrou, A; Lunderberg, E; DeYoung, P A; Attanayake, H; Baumann, T; Bazin, D; Brown, B A; Christian, G; Divaratne, D; Grimes, S M; Haagsma, A; Finck, J E; Frank, N; Luther, B; Mosby, S; Nagi, T; Peaslee, G F; Peters, W A; Schiller, A; Smith, J K; Snyder, J; Strongman, M; Volya, A

    2012-01-01

    Neutron decay spectroscopy has become a successful tool to explore nuclear properties of nuclei with the largest neutron-to-proton ratios. Resonances in nuclei located beyond the neutron dripline are accessible by kinematic reconstruction of the decay products. The development of two-neutron detection capabilities of the Modular Neutron Array (MoNA) at NSCL has opened up the possibility to search for unbound nuclei which decay by the emission of two neutrons. Specifically this exotic decay mode was observed in 16Be and 26O.

  2. Observation of Ground-State Two-Neutron Decay

    E-print Network

    M. Thoennessen; Z. Kohley; A. Spyrou; E. Lunderberg; P. A. DeYoung; H. Attanayake; T. Baumann; D. Bazin; B. A. Brown; G. Christian; D. Divaratne; S. M. Grimes; A. Haagsma; J. E. Finck; N. Frank; B. Luther; S. Mosby; T. Nagi; G. F. Peaslee; W. A. Peters; A. Schiller; J. K. Smith; J. Snyder; M. Strongman; A. Volya

    2012-11-09

    Neutron decay spectroscopy has become a successful tool to explore nuclear properties of nuclei with the largest neutron-to-proton ratios. Resonances in nuclei located beyond the neutron dripline are accessible by kinematic reconstruction of the decay products. The development of two-neutron detection capabilities of the Modular Neutron Array (MoNA) at NSCL has opened up the possibility to search for unbound nuclei which decay by the emission of two neutrons. Specifically this exotic decay mode was observed in 16Be and 26O.

  3. Observational Constraints on the Progenitors of Core-Collapse Supernovae: The Case for Missing High-Mass Stars

    NASA Astrophysics Data System (ADS)

    Smartt, S. J.

    2015-04-01

    Over the last 15 years, the supernova community has endeavoured to directly identify progenitor stars for core-collapse supernovae discovered in nearby galaxies. These precursors are often visible as resolved stars in high-resolution images from space-and ground-based telescopes. The discovery rate of progenitor stars is limited by the local supernova rate and the availability and depth of archive images of galaxies, with 18 detections of precursor objects and 27 upper limits. This review compiles these results (from 1999 to 2013) in a distance-limited sample and discusses the implications of the findings. The vast majority of the detections of progenitor stars are of type II-P, II-L, or IIb with one type Ib progenitor system detected and many more upper limits for progenitors of Ibc supernovae (14 in all). The data for these 45 supernovae progenitors illustrate a remarkable deficit of high-luminosity stars above an apparent limit of logL/L? ? 5.1 dex. For a typical Salpeter initial mass function, one would expect to have found 13 high-luminosity and high-mass progenitors by now. There is, possibly, only one object in this time- and volume-limited sample that is unambiguously high-mass (the progenitor of SN2009ip) although the nature of that supernovae is still debated. The possible biases due to the influence of circumstellar dust, the luminosity analysis, and sample selection methods are reviewed. It does not appear likely that these can explain the missing high-mass progenitor stars. This review concludes that the community's work to date shows that the observed populations of supernovae in the local Universe are not, on the whole, produced by high-mass (M ? 18 M?) stars. Theoretical explosions of model stars also predict that black hole formation and failed supernovae tend to occur above an initial mass of M ? 18 M?. The models also suggest there is no simple single mass division for neutron star or black-hole formation and that there are islands of explodability for stars in the 8-120 M? range.The observational constraints are quite consistent with the bulk of stars above M ? 18 M? collapsing to form black holes with no visible supernovae.

  4. Semileptonic Decays

    SciTech Connect

    Luth, Vera G.; /SLAC

    2012-10-02

    The following is an overview of the measurements of the CKM matrix elements |V{sub cb}| and |V{sub ub}| that are based on detailed studies of semileptonic B decays by the BABAR and Belle Collaborations and major advances in QCD calculations. In addition, a new and improved measurement of the ratios R(D{sup (*)}) = {Beta}({bar B} {yields} D{sup (*)}{tau}{sup -}{bar {nu}}{sub {tau}})/{Beta}({bar B} {yields} D{sup (*)}{ell}{sup -}{bar {nu}}{sub {ell}}) is presented. Here D{sup (*)} refers to a D or a D* meson and {ell} is either e or {mu}. The results, R(D) = 0.440 {+-} 0.058 {+-} 0.042 and R(D*) = 0.332 {+-} 0.024 {+-} 0.018, exceed the Standard Model expectations by 2.0{sigma} and 2.7{sigma}, respectively. Taken together, they disagree with these expectations at the 3.4{sigma} level. The excess of events cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.

  5. Study of charged hadronic four-body decays of the D0 meson

    NASA Astrophysics Data System (ADS)

    Frabetti, P. L.; Cheung, H. W. K.; Cumalat, J. P.; Dallapiccola, C.; Ginkel, J. F.; Greene, S. V.; Johns, W. E.; Nehring, M. S.; Butler, J. N.; Cihangir, S.; Gaines, I.; Garbincius, P. H.; Garren, L.; Gourlay, S. A.; Harding, D. J.; Kasper, P.; Kreymer, A.; Lebrun, P.; Shukla, S.; Vittone, M.; Bianco, S.; Fabbri, F. L.; Sarwar, S.; Zallo, A.; Culbertson, R.; Gardner, R. W.; Greene, R.; Wiss, J.; Alimonti, G.; Bellini, G.; Boschini, M.; Brambilla, D.; Caccianiga, B.; Cinquini, L.; Di Corato, M.; Giammarchi, M.; Inzani, P.; Leveraro, F.; Malvezzi, S.; Menasce, D.; Meroni, E.; Moroni, L.; Pedrini, D.; Perasso, L.; Prelz, F.; Sala, A.; Sala, S.; Torretta, D.; Buchholz, D.; Claes, D.; Gobbi, B.; O'Reilly, B.; Bishop, J. M.; Cason, N. M.; Kennedy, C. J.; Kim, G. N.; Lin, T. F.; Puseljic, D. L.; Ruchti, R. C.; Shephard, W. D.; Swiatek, J. A.; Wu, Z. Y.; Arena, V.; Boca, G.; Castoldi, C.; Gianini, G.; Ratti, S. P.; Riccardi, C.; Viola, L.; Vitulo, P.; Lopez, A.; Grim, G. P.; Paolone, V. S.; Yager, P. M.; Wilson, J. R.; Sheldon, P. D.; Davenport, F.; Blackett, G. R.; Danyo, K.; Pisharody, M.; Handler, T.; Cheon, B. G.; Kang, J. S.; Kim, K. Y.; E687 Collaboration

    1995-02-01

    Charged hadronic four-body decays of D0 mesons have been studied in the E687 photoproduction experiment at Fermilab. Branching ratios relative to the D0 ? K-?+?+?- decay mode for the Cabibbo-suppressed decays D0 ? ?-?+?-?+, D0 ? K-K+?-?+ have been measured and the first evidence of the D0 ? K-K+K-?+ decay mode is reported. An analysis of the D0 ? K-K+?-?+ resonance structure is also presented.

  6. Search for High Mass Top Quark Production in pp¯ Collisions at s = 1.8 TeV

    Microsoft Academic Search

    S. Abachi; B. Abbott; M. Abolins; B. S. Acharya; I. Adam; D. L. Adams; M. Adams; S. Ahn; H. Aihara; G. Álvarez; G. A. Alves; E. Amidi; N. Amos; E. W. Anderson; S. H. Aronson; R. Astur; R. E. Avery; A. Baden; V. Balamurali; J. Balderston; B. Baldin; J. Bantly; J. F. Bartlett; K. Bazizi; T. Behnke; J. Bendich; S. B. Beri; I. Bertram; V. A. Bezzubov; P. C. Bhat; V. Bhatnagar; M. Bhattacharjee; A. Bischoff; N. Biswas; G. Blazey; S. Blessing; A. Boehnlein; N. I. Bojko; F. Borcherding; J. Borders; C. Boswell; A. Brandt; R. Brock; A. Bross; D. Buchholz; V. S. Burtovoi; J. M. Butler; O. Callot; D. Casey; H. Castilla-Valdez; D. Chakraborty; S.-M. Chang; S. V. Chekulaev; L.-P. Chen; W. Chen; L. Chevalier; S. Chopra; B. C. Choudhary; J. H. Christenson; M. Chung; D. Claes; A. R. Clark; W. G. Cobau; J. Cochran; W. E. Cooper; C. Cretsinger; D. Cullen-Vidal; M. Cummings; J. P. Cussonneau; D. Cutts; O. I. Dahl; K. de; M. Demarteau; R. Demina; K. Denisenko; N. Denisenko; D. Denisov; S. P. Denisov; W. Dharmaratna; H. T. Diehl; M. Diesburg; R. Dixon; P. Draper; J. Drinkard; Y. Ducros; S. Durston-Johnson; D. Eartly; D. Edmunds; A. O. Efimov; J. Ellison; V. D. Elvira; R. Engelmann; S. Eno; G. Eppley; P. Ermolov; O. V. Eroshin; V. N. Evdokimov; S. Fahey; T. Fahland; M. Fatyga; J. Featherly; S. Feher; D. Fein; T. Ferbel; G. Finocchiaro; H. E. Fisk; Yu. Fisyak; E. Flattum; G. E. Forden; M. Fortner; K. C. Frame; P. Franzini; S. Fredriksen; S. Fuess; E. Gallas; C. S. Gao; T. L. Geld; R. J. Genik II; K. Genser; C. E. Gerber; B. Gibbard; V. Glebov; S. Glenn; J. F. Glicenstein; B. Gobbi; M. Goforth; A. Goldschmidt; B. Gomez; M. L. Good; H. Gordon; N. Graf; P. D. Grannis; D. R. Green; J. Green; H. Greenlee; N. Grossman; P. Grudberg; S. Grünendahl; J. A. Guida; J. M. Guida; W. Guryn; N. J. Hadley; H. Haggerty; S. Hagopian; V. Hagopian; K. S. Hahn; R. E. Hall; S. Hansen; J. M. Hauptman; D. Hedin; A. P. Heinson; U. Heintz; T. Heuring; R. Hirosky; J. D. Hobbs; B. Hoeneisen; J. S. Hoftun; Ting Hu; Tong Hu; J. R. Hubbard; T. Huehn; S. Igarashi; A. S. Ito; E. James; J. Jaques; S. A. Jerger; J. Z.-Y. Jiang; T. Joffe-Minor; H. Johari; K. Johns; M. Johnson; H. Johnstad; A. Jonckheere; M. Jones; H. Jöstlein; S. Y. Jun; C. K. Jung; S. Kahn; J. S. Kang; R. Kehoe; M. Kelly; A. Kernan; L. Kerth; C. L. Kim; A. Klatchko; B. Klima; B. I. Klochkov; C. Klopfenstein; V. I. Klyukhin; V. I. Kochetkov; J. M. Kohli; D. Koltick; J. Kotcher; J. Kourlas; A. V. Kozelov; E. A. Kozlovski; M. R. Krishnaswamy; S. Krzywdzinski; S. Kunori; S. Lami; G. Landsberg; R. E. Lanou; J.-F. Lebrat; J. Lee-Franzini; A. Leflat; H. Li; J. Li; R. B. Li; Y. K. Li; Q. Z. Li-Demarteau; J. G. Lima; S. L. Linn; J. Linnemann; R. Lipton; Y. C. Liu; F. Lobkowicz; P. Loch; S. C. Loken; S. Lökös; L. Lueking; A. L. Lyon; A. K. Maciel; R. J. Madaras; R. Madden; Ph. Mangeot; S. Mani; I. Manning; B. Mansoulié; H. S. Mao; S. Margulies; R. Markeloff; L. Markosky; T. Marshall; M. I. Martin; M. Marx; B. May; A. A. Mayorov; R. McCarthy; T. McKibben; J. McKinley; H. L. Melanson; J. R. de Mello Neto; X. C. Meng; K. W. Merritt; H. Miettinen; A. Milder; C. Milner; A. Mincer; J. M. de Miranda; C. S. Mishra; N. Mokhov; N. K. Mondal; H. E. Montgomery; P. Mooney; M. Mudan; C. Murphy; F. Nang; M. Narain; V. S. Narasimham; H. A. Neal; J. P. Negret; P. Nemethy; D. NesiC; D. Norman; L. Oesch; V. Oguri; E. Oltman; N. Oshima; D. Owen; P. Padley; M. Pang; A. Para; C. H. Park; R. Partridge; M. Paterno; A. Peryshkin; M. Peters; B. Pi; H. Piekarz; D. Pizzuto; A. Pluquet; V. M. Podstavkov; B. G. Pope; H. B. Prosper; S. Protopopescu; D. Puseljic; J. Qian; Y.-K. Que; P. Z. Quintas; G. Rahal-Callot; R. Raja; S. Rajagopalan; O. Ramirez; M. V. Rao; L. Rasmussen; A. L. Read; S. Reucroft; M. Rijssenbeek; N. A. Roe; J. M. Roldan; P. Rubinov; R. Ruchti; S. Rusin; J. Rutherfoord; A. Santoro; L. Sawyer; R. D. Schamberger; H. Schellman; D. Schmid; J. Sculli; E. Shabalina; C. Shaffer; H. C. Shankar; Y. Shao; R. K. Shivpuri; M. Shupe; J. B. Singh; V. Sirotenko; J. Skeens; W. Smart; A. Smith; R. P. Smith; R. Snihur; G. R. Snow; S. Snyder; J. Solomon; P. M. Sood; M. Sosebee; M. Souza; A. L. Spadafora; R. W. Stephens; M. L. Stevenson; D. Stewart; F. Stocker; D. A. Stoianova; D. Stoker; K. Streets; M. Strovink; A. Taketani; P. Tamburello; M. Tartaglia; T. L. Taylor; J. Teiger; J. Thompson; T. G. Trippe; P. M. Tuts; E. W. Varnes; P. R. Virador; A. A. Volkov; A. P. Vorobiev; H. D. Wahl; D. C. Wang; L. Z. Wang; J. Warchol; M. Wayne; H. Weerts; W. A. Wenzel; A. White; J. T. White; J. A. Wightman; J. Wilcox; S. Willis; S. J. Wimpenny; Z. Wolf; J. Womersley; E. Won; D. R. Wood; Y. Xia; D. Xiao; R. P. Xie; H. Xu; R. Yamada; P. Yamin; C. Yanagisawa; J. Yang; T. Yasuda; C. Yoshikawa; S. Youssef; J. Yu; C. Zeitnitz; D. Zhang; Y. Zhang; Z. Zhang; Y. H. Zhou; Q. Zhu; Y. S. Zhu; D. Zieminska; A. Zieminski; A. Zinchenko

    1995-01-01

    We present new results on the search for the top quark in pp¯ collisions at s = 1.8 TeV with an integrated luminosity of 13.5+\\/-1.6 pb-1. We have considered tt¯ production in the standard model using electron and muon dilepton decay channels ( tt¯-->emu + jets, ee + jets, and mumu + jets) and single-lepton decay channels ( tt¯-->e +

  7. The structure of blue supergiant winds and the accretion in supergiant High Mass X-ray Binaries

    E-print Network

    Ducci, L; Mereghetti, S; Paizis, A; Romano, P

    2009-01-01

    We have developed a stellar wind model for OB supergiants to investigate the effects of accretion from a clumpy wind on the luminosity and variability properties of High Mass X-ray Binaries. Assuming that the clumps are confined by ram pressure of the ambient gas and exploring different distributions for their mass and radii, we computed the expected X-ray light curves in the framework of the Bondi-Hoyle accretion theory, modified to take into account the presence of clumps. The resulting variability properties are found to depend not only on the assumed orbital parameters but also on the wind characteristics. We have then applied this model to reproduce the X-ray light curves of three representative High Mass X-ray Binaries: two persistent supergiant systems (VelaX-1 and 4U1700-377) and the Supergiant Fast X-ray Transient IGRJ11215-5952. The model can reproduce well the observed light curves, but requiring in all cases an overall mass loss from the supergiant about a factor 3-10 smaller than the values infer...

  8. Interferometric Observations of High-Mass Star-Forming Clumps with Unusual N2H+/HCO+ Line Ratios

    E-print Network

    Stephens, Ian W; Sanhueza, Patricio; Whitaker, J Scott; Hoq, Sadia; Rathborne, Jill M; Foster, Jonathan B

    2015-01-01

    The Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey has detected high-mass star-forming clumps with anomalous N$_2$H$^+$/HCO$^+$(1-0) integrated intensity ratios that are either unusually high ("N$_2$H$^+$ rich") or unusually low ("N$_2$H$^+$ poor"). With 3 mm observations from the Australia Telescope Compact Array (ATCA), we imaged two N$_2$H$^+$ rich clumps, G333.234-00.061 and G345.144-00.216, and two N$_2$H$^+$ poor clumps, G351.409+00.567 and G353.229+00.672. In these clumps, the N$_2$H$^+$ rich anomalies arise from extreme self-absorption of the HCO$^+$ line. G333.234-00.061 contains two of the most massive protostellar cores known with diameters of less than 0.1 pc, separated by a projected distance of only 0.12 pc. Unexpectedly, the higher mass core appears to be at an earlier evolutionary stage than the lower mass core, which may suggest that two different epochs of high-mass star formation can occur in close proximity. Through careful analysis of the ATCA observations and MALT90 clumps (incl...

  9. Workflow for analysis of high mass accuracy salivary data set using MaxQuant and ProteinPilot search algorithm.

    PubMed

    Jagtap, Pratik; Bandhakavi, Sricharan; Higgins, LeeAnn; McGowan, Thomas; Sa, Rongxiao; Stone, Matthew D; Chilton, John; Arriaga, Edgar A; Seymour, Sean L; Griffin, Timothy J

    2012-06-01

    LTQ Orbitrap data analyzed with ProteinPilot can be further improved by MaxQuant raw data processing, which utilizes precursor-level high mass accuracy data for peak processing and MGF creation. In particular, ProteinPilot results from MaxQuant-processed peaklists for Orbitrap data sets resulted in improved spectral utilization due to an improved peaklist quality with higher precision and high precursor mass accuracy (HPMA). The output and postsearch analysis tools of both workflows were utilized for previously unexplored features of a three-dimensional fractionated and hexapeptide library (ProteoMiner) treated whole saliva data set comprising 200 fractions. ProteinPilot's ability to simultaneously predict multiple modifications showed an advantage from ProteoMiner treatment for modified peptide identification. We demonstrate that complementary approaches in the analysis pipeline provide comprehensive results for the whole saliva data set acquired on an LTQ Orbitrap. Overall our results establish a workflow for improved protein identification from high mass accuracy data. PMID:22623410

  10. Interferometric Observations of High-Mass Star-Forming Clumps With Unusual N2H+/HCO+ Line Ratios

    NASA Astrophysics Data System (ADS)

    Stephens, Ian W.; Jackson, James M.; Sanhueza, Patricio; Whitaker, J. Scott; Hoq, Sadia; Rathborne, Jill M.; Foster, Jonathan B.

    2015-03-01

    The Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey has detected high-mass star-forming clumps with anomalous N2H+/HCO+(1-0) integrated intensity ratios that are either unusually high (“N2H+ rich”) or unusually low (“N2H+ poor”). With 3 mm observations from the Australia Telescope Compact Array (ATCA), we imaged two N2H+ rich clumps, G333.234-00.061 and G345.144-00.216, and two N2H+ poor clumps, G351.409+00.567 and G353.229+00.672. In these clumps, the N2H+ rich anomalies arise from extreme self-absorption of the HCO+ line. G333.234-00.061 contains two of the most massive protostellar cores known with diameters of less than 0.1 pc, separated by a projected distance of only 0.12 pc. Unexpectedly, the higher mass core appears to be at an earlier evolutionary stage than the lower mass core, which may suggest that two different epochs of high-mass star formation can occur in close proximity. Through careful analysis of the ATCA observations and MALT90 clumps (including the G333, NGC 6334, and NGC 6357 star formation regions), we find that N2H+ poor anomalies arise at clump scales and are caused by lower relative abundances of N2H+ due to the distinct chemistry of H ii regions or photodissociation regions.

  11. Search for resonances in the dilepton mass distribution in pp collisions at TeV

    Microsoft Academic Search

    S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; A. Tumasyan; W. Adam; T. Bergauer; M. Dragicevic; J. Erö; C. Fabjan; M. Friedl; R. Frühwirth; V. M. Ghete; J. Hammer; S. Hänsel; M. Hoch; N. Hörmann; J. Hrubec; M. Jeitler; G. Kasieczka; W. Kiesenhofer; M. Krammer; D. Liko; I. Mikulec; M. Pernicka; H. Rohringer; R. Schöfbeck; J. Strauss; F. Teischinger; P. Wagner; W. Waltenberger; G. Walzel; E. Widl; C.-E. Wulz; V. Mossolov; N. Shumeiko; J. Suarez Gonzalez; L. Benucci; E. A. De Wolf; X. Janssen; T. Maes; L. Mucibello; S. Ochesanu; B. Roland; R. Rougny; M. Selvaggi; H. Van Haevermaet; P. Van Mechelen; N. Van Remortel; F. Blekman; S. Blyweert; J. D’Hondt; O. Devroede; R. Gonzalez Suarez; A. Kalogeropoulos; J. Maes; M. Maes; W. Van Doninck; P. Van Mulders; G. P. Van Onsem; I. Villella; O. Charaf; B. Clerbaux; G. De Lentdecker; V. Dero; A. P. R. Gay; G. H. Hammad; T. Hreus; P. E. Marage; L. Thomas; C. Vander Velde; P. Vanlaer; V. Adler; A. Cimmino; S. Costantini; M. Grunewald; B. Klein; J. Lellouch; A. Marinov; J. Mccartin; D. Ryckbosch; F. Thyssen; M. Tytgat; L. Vanelderen; P. Verwilligen; S. Walsh; N. Zaganidis; S. Basegmez; G. Bruno; J. Caudron; L. Ceard; E. Cortina Gil; J. De Favereau De Jeneret; C. Delaere; D. Favart; A. Giammanco; G. Grégoire; J. Hollar; V. Lemaitre; J. Liao; O. Militaru; S. Ovyn; D. Pagano; A. Pin; K. Piotrzkowski; N. Schul; N. Beliy; T. Caebergs; E. Daubie; G. A. Alves; D. De Jesus Damiao; M. E. Pol; M. H. G. Souza; W. Carvalho; E. M. Da Costa; C. De Oliveira Martins; S. Fonseca De Souza; L. Mundim; H. Nogima; V. Oguri; W. L. Prado Da Silva; A. Santoro; S. M. Silva Do Amaral; A. Sznajder; F. Torres Da Silva De Araujo; F. A. Dias; T. R. Fernandez Perez Tomei; E. M. Gregores; C. Lagana; F. Marinho; P. G. Mercadante; S. F. Novaes; Sandra S. Padula; N. Darmenov; L. Dimitrov; V. Genchev; P. Iaydjiev; S. Piperov; M. Rodozov; S. Stoykova; G. Sultanov; V. Tcholakov; R. Trayanov; I. Vankov; A. Dimitrov; R. Hadjiiska; A. Karadzhinova; V. Kozhuharov; L. Litov; M. Mateev; B. Pavlov; P. Petkov; J. G. Bian; G. M. Chen; H. S. Chen; C. H. Jiang; D. Liang; S. Liang; X. Meng; J. Tao; J. Wang; X. Wang; Z. Wang; H. Xiao; M. Xu; J. Zang; Z. Zhang; Y. Ban; S. Guo; Y. Guo; W. Li; Y. Mao; S. J. Qian; H. Teng; L. Zhang; B. Zhu; W. Zou; A. Cabrera; B. Gomez Moreno; A. A. Ocampo Rios; A. F. Osorio Oliveros; J. C. Sanabria; N. Godinovic; D. Lelas; K. Lelas; R. Plestina; D. Polic; I. Puljak; Z. Antunovic; M. Dzelalija; V. Brigljevic; S. Duric; K. Kadija; S. Morovic; A. Attikis; M. Galanti; J. Mousa; C. Nicolaou; F. Ptochos; P. A. Razis; M. Finger; Y. Assran; S. Khalil; M. A. Mahmoud; A. Hektor; M. Kadastik; M. Müntel; M. Raidal; L. Rebane; V. Azzolini; P. Eerola; G. Fedi; S. Czellar; J. Härkönen; A. Heikkinen; V. Karimäki; R. Kinnunen; M. J. Kortelainen; T. Lampén; K. Lassila-Perini; S. Lehti; T. Lindén; P. Luukka; T. Mäenpää; E. Tuominen; J. Tuominiemi; E. Tuovinen; D. Ungaro; L. Wendland; K. Banzuzi; A. Korpela; T. Tuuva; D. Sillou; M. Besancon; S. Choudhury; M. Dejardin; D. Denegri; B. Fabbro; J. L. Faure; F. Ferri; S. Ganjour; F. X. Gentit; A. Givernaud; P. Gras; G. Hamel de Monchenault; P. Jarry; E. Locci; J. Malcles; M. Marionneau; L. Millischer; J. Rander; A. Rosowsky; I. Shreyber; M. Titov; P. Verrecchia; S. Baffioni; F. Beaudette; L. Benhabib; L. Bianchini; M. Bluj; C. Broutin; P. Busson; C. Charlot; T. Dahms; L. Dobrzynski; S. Elgammal; R. Granier de Cassagnac; M. Haguenauer; P. Miné; C. Mironov; C. Ochando; P. Paganini; D. Sabes; R. Salerno; Y. Sirois; C. Thiebaux; B. Wyslouch; A. Zabi; J.-L. Agram; J. Andrea; D. Bloch; D. Bodin; J.-M. Brom; M. Cardaci; E. C. Chabert; C. Collard; E. Conte; F. Drouhin; C. Ferro; J.-C. Fontaine; D. Gelé; U. Goerlach; S. Greder; P. Juillot; M. Karim; A.-C. Le Bihan; Y. Mikami; P. Van Hove; F. Fassi; D. Mercier; C. Baty; S. Beauceron; N. Beaupere; M. Bedjidian; O. Bondu; G. Boudoul; D. Boumediene; H. Brun; R. Chierici; D. Contardo; P. Depasse; H. El Mamouni; J. Fay; S. Gascon; B. Ille; T. Kurca; T. Le Grand; M. Lethuillier; L. Mirabito; S. Perries; V. Sordini; S. Tosi; Y. Tschudi; P. Verdier; D. Lomidze; G. Anagnostou; M. Edelhoff; L. Feld; N. Heracleous; O. Hindrichs; R. Jussen; K. Klein; J. Merz; N. Mohr; A. Ostapchuk; A. Perieanu; F. Raupach; J. Sammet; S. Schael; D. Sprenger; H. Weber; M. Weber; B. Wittmer; M. Ata; W. Bender; E. Dietz-Laursonn; M. Erdmann; J. Frangenheim; T. Hebbeker; A. Hinzmann; K. Hoepfner; T. Klimkovich; D. Klingebiel; P. Kreuzer; D. Lanske; C. Magass; M. Merschmeyer; A. Meyer; P. Papacz; H. Pieta; H. Reithler; S. A. Schmitz; L. Sonnenschein; J. Steggemann; D. Teyssier; M. Tonutti; M. Bontenackels; M. Davids; M. Duda; G. Flügge; H. Geenen; M. Giffels; W. Haj Ahmad; D. Heydhausen; T. Kress; Y. Kuessel; A. Linn; A. Nowack; L. Perchalla; O. Pooth; J. Rennefeld; P. Sauerland; A. Stahl; M. Thomas

    2011-01-01

    A search for narrow resonances at high mass in the dimuon and dielectron channels has been performed by the CMS experiment\\u000a at the CERN LHC, using pp collision data recorded at TeV. The event samples correspond to integrated luminosities of 40 pb?1 in the dimuon channel and 35 pb?1 in the dielectron channel. Heavy dilepton resonances are predicted in theoretical

  12. Resonant transfer excitation: Interference effects

    SciTech Connect

    Shafroth, S.M. [North Carolina Univ., Chapel Hill, NC (United States). Dept. of Physics and Astronomy; Benhenni, M. [North Carolina Univ., Chapel Hill, NC (United States). Dept. of Physics and Astronomy]|[Toulouse-3 Univ., 31 (France). Lab. de Decharges dans les Gaz; Swenson, J.K. [Oak Ridge National Lab., TN (United States)]|[Lawrence Livermore National Lab., CA (United States); Schulz, M. [Oak Ridge National Lab., TN (United States)]|[Missouri Univ., Rolla, MO (United States). Dept. of Physics; Giese, J.P.; Schone, H. [Oak Ridge National Lab., TN (United States)]|[Kansas State Univ., Manhattan, KS (United States). Dept. of Physics; Vane, C.R.; Dittner, P.F.; Datz, S. [Oak Ridge National Lab., TN (United States)

    1991-12-31

    Interference effects in RTE (Resonant Transfer Excitation) can be studied for low Z projectiles via Auger electrons emitted from highly ionized fast moving projectile ions following collisions with low Z targets. RTE in ion-atom collisions is closely related to dielectronic recombination. In the latter case which is of practical interest to the fusion power program an electron with the proper velocity incident on a highly charged ion is resonantly captured and simultaneously interacts with an inner shell electron to excite it, thus forming a doubly excited state which may decay predominantly by X-ray emission for higher Z ions or by Auger electron decay for lower Z ions. The resonant velocity is that of the Auger electron emitted by the ion in the doubly excited state in RTE the electrons to be captured are in low Z atomic (typically He) or Molecular (typically H{sub 2}) targets and the ions are produced by accelerators in highly charged states with the appropriate resonant velocity. The resonance is much broadened by the velocity distribution of the target electrons. Thus the resonance width as a function of projectile energy is determined by folding the Compton profile of the target electrons with the dielectronic recombination cross sections. A weaker effect and more speculative is Two Electron Transfer Excitation. Here one target electron excites the projectile 1s electron to the 2p shell for example and the other target electron is captured to an excited state of the projectile. This effect becomes more important at projectile energies higher than the energy where the RTE cross section has its maximum value. The electron--electron interaction has been beautifully demonstrated by Zouros et al. Finally, there might be interference with shakeup. This paper will present angular distribution measurements of Auger lines so that the effects of interference between these various processes can be studied.

  13. Resonant transfer excitation: Interference effects

    SciTech Connect

    Shafroth, S.M. (North Carolina Univ., Chapel Hill, NC (United States). Dept. of Physics and Astronomy); Benhenni, M. (North Carolina Univ., Chapel Hill, NC (United States). Dept. of Physics and Astronomy Toulouse-3 Univ., 31 (France). Lab. de Decharges dans les Gaz); Swenson, J.K. (Oak Ridge National Lab., TN (United States) Lawrence Livermore National Lab., CA (United States)); Schulz, M. (Oak R

    1991-01-01

    Interference effects in RTE (Resonant Transfer Excitation) can be studied for low Z projectiles via Auger electrons emitted from highly ionized fast moving projectile ions following collisions with low Z targets. RTE in ion-atom collisions is closely related to dielectronic recombination. In the latter case which is of practical interest to the fusion power program an electron with the proper velocity incident on a highly charged ion is resonantly captured and simultaneously interacts with an inner shell electron to excite it, thus forming a doubly excited state which may decay predominantly by X-ray emission for higher Z ions or by Auger electron decay for lower Z ions. The resonant velocity is that of the Auger electron emitted by the ion in the doubly excited state in RTE the electrons to be captured are in low Z atomic (typically He) or Molecular (typically H{sub 2}) targets and the ions are produced by accelerators in highly charged states with the appropriate resonant velocity. The resonance is much broadened by the velocity distribution of the target electrons. Thus the resonance width as a function of projectile energy is determined by folding the Compton profile of the target electrons with the dielectronic recombination cross sections. A weaker effect and more speculative is Two Electron Transfer Excitation. Here one target electron excites the projectile 1s electron to the 2p shell for example and the other target electron is captured to an excited state of the projectile. This effect becomes more important at projectile energies higher than the energy where the RTE cross section has its maximum value. The electron--electron interaction has been beautifully demonstrated by Zouros et al. Finally, there might be interference with shakeup. This paper will present angular distribution measurements of Auger lines so that the effects of interference between these various processes can be studied.

  14. LATTICE DYNAMICS NUCLEAR RESONANCE ABSORPTION OF GAMMA-RADIATION

    E-print Network

    Paris-Sud XI, Université de

    LATTICE DYNAMICS NUCLEAR RESONANCE ABSORPTION OF GAMMA-RADIATION AND COHERENT DECAY MODES Institut effets de correlation de paires. Abstract. -The cross-section for nuclear resonance absorption of gamma-radiation rksonnante des radiations gamma est en gBneral calculee en negligeant I'influence des phenomknes de coherence

  15. Calculating Resonance Positions and Widths Using the Siegert Approximation Method

    ERIC Educational Resources Information Center

    Rapedius, Kevin

    2011-01-01

    Here, we present complex resonance states (or Siegert states) that describe the tunnelling decay of a trapped quantum particle from an intuitive point of view that naturally leads to the easily applicable Siegert approximation method. This can be used for analytical and numerical calculations of complex resonances of both the linear and nonlinear…

  16. Electroelastic Effects and Impurity Relaxation in Quartz Resonators

    Microsoft Academic Search

    R. Brendel; J. J. Gagnepain

    1982-01-01

    Summary The application of an electric DC field on a quartz crystal resonator induces a fast variation of the resonance frequency followed by a slow quasiexponential decay typical of ionic impurity relaxation (J. Kusters, FCS 1970). The frequency variation under the DC field was interpreted in terms of an electroelastic effect corresponding to a change of the elastic constants through

  17. Decay Spectroscopy for Nuclear Astrophysics: {beta}-delayed Proton Decay

    SciTech Connect

    Trache, L.; Simmons, E.; Spiridon, A.; McCleskey, M.; Roeder, B. T.; Tribble, R. E. [Texas A and M University, College Station, TX 77845 (United States); Saastamoinen, A.; Jokinen, A.; Aysto, J. [University of Jyvaskyla, Jyvaskyla (Finland); Davinson, T.; Woods, P. J. [University of Edinburgh, Edinburgh (United Kingdom); Pollacco, E.; Kebbiri, M. [CEA/IRFU Saclay (France); Pascovici, G. [IKP, Universitaet zu Koeln (Germany)

    2011-11-30

    Decay spectroscopy is one of the oldest indirect methods in nuclear astrophysics. We have developed at TAMU techniques to measure beta- and beta-delayed proton decay of sd-shell, proton-rich nuclei. The short-lived radioactive species are produced in-flight, separated, then slowed down (from about 40 MeV/u) and implanted in the middle of very thin Si detectors. These allowed us to measure protons with energies as low as 200 keV from nuclei with lifetimes of 100 ms or less. At the same time we measure gamma-rays up to 8 MeV with high resolution HPGe detectors. We have studied the decay of {sup 23}Al, {sup 27}P, {sup 31}Cl, all important for understanding explosive H-burning in novae. The technique has shown a remarkable selectivity to beta-delayed charged-particle emission and works even at radioactive beam rates of a few pps. The states populated are resonances for the radiative proton capture reactions {sup 22}Na(p,{gamma}){sup 23}Mg(crucial for the depletion of {sup 22}Na in novae), {sup 26m}Al(p,{gamma}){sup 27}Si and {sup 30}P(p,{gamma}){sup 31}S(bottleneck in novae and XRB burning), respectively. More recently we have radically improved the technique using a gas based detector we call AstroBox.

  18. Improving LHC searches for strong EW symmetry breaking resonances

    E-print Network

    Kaminska, Anna

    2015-01-01

    Composite Higgs models generically predict the existence of heavy spin-1 resonances with the same quantum numbers as electroweak gauge bosons. The effective lagrangian description of these resonances is presented, pointing out the origin of their interactions with SM matter fields and the resulting LHC phenomenology. Search strategies for spin-1 resonances are discussed, mentioning possible advantages offered by boosted decay products. The impact of interactions between spin-1 resonances and fermion resonances, crucial for the proper interpretation of LHC searches, is pointed out.

  19. Improving LHC searches for strong EW symmetry breaking resonances

    E-print Network

    Anna Kaminska

    2015-05-18

    Composite Higgs models generically predict the existence of heavy spin-1 resonances with the same quantum numbers as electroweak gauge bosons. The effective lagrangian description of these resonances is presented, pointing out the origin of their interactions with SM matter fields and the resulting LHC phenomenology. Search strategies for spin-1 resonances are discussed, mentioning possible advantages offered by boosted decay products. The impact of interactions between spin-1 resonances and fermion resonances, crucial for the proper interpretation of LHC searches, is pointed out.

  20. Physical properties of high-mass star-forming clumps in different evolutionary stages from the Bolocam Galactic Plane Survey

    NASA Astrophysics Data System (ADS)

    Svoboda, Brian; Shirley, Yancy; Rosolowsky, Erik; Dunham, Miranda; Ellsworth-Bowers, Timothy; Ginsburg, Adam

    2013-07-01

    High mass stars play a key role in the physical and chemical evolution of the interstellar medium, yet the evolutionary sequence for high mass star forming regions is poorly understood. Recent Galactic plane surveys are providing the first systematic view of high-mass star-forming regions in all evolutionary phases across the Milky Way. We present observations of the 22.23 GHz H2O maser transition J(Ka,Kc) = 6(1,6)?5(2,3) transition toward 1398 clumps identified in the Bolocam Galactic Plane Survey using the 100m Green Bank Telescope (GBT). We detect 392 H2O masers, 279 (71%) newly discovered. We show that H2O masers can identify the presence of protostars which were not previously identified by Spitzer/MSX Galactic plane IR surveys: 25% of IR-dark clumps have an H2O maser. We compare the physical properties of the clumps in the Bolocam Galactic Plane Survey (BGPS) with observations of diagnostics of star formation activity: 8 and 24 um YSO candidates, H2O and CH3OH masers, shocked H2, EGOs, and UCHII regions. We identify a sub-sample of 400 clumps with no star formation indicators representing the largest and most robust sample of pre-protocluster candidates from an unbiased survey to date. The different evolutionary stages show strong separations in HCO+ linewidth and integrated intensity, surface mass density, and kinetic temperature. Monte Carlo techniques are applied to distance probability distribution functions (DPDFs) in order to marginalize over the kinematic distance ambiguity and calculate the distribution of derived quantities for clumps in different evolutionary stages. Surface area and dust mass show weak separations above > 2 pc^2 and > 3x10^3 solar masses. An observed breakdown occurs in the size-linewidth relationship with no differentiation by evolutionary stage. Future work includes adding evolutionary indicators (MIPSGAL, HiGal, MMB) and expanding DPDF priors (HI self-absorption, Galactic structure) for more well-resolved KDAs.

  1. Large hadron collider probe of supersymmetric neutrinoless double-beta-decay mechanism.

    PubMed

    Allanach, B C; Kom, C H; Päs, H

    2009-08-28

    In the minimal supersymmetric extension to the standard model, a nonzero lepton number violating coupling lambda(111);(') predicts both neutrinoless double-beta-decay and resonant single slepton production at the LHC. We show that, in this case, if neutrinoless double beta decay is discovered in the next generation of experiments, there exist good prospects to observe single slepton production at the LHC. Neutrinoless double beta decay could otherwise result from a different source (such as a nonzero Majorana neutrino mass). Resonant single slepton production at the LHC can therefore discriminate between the lambda(111);(') neutrinoless double-beta-decay mechanism and others. PMID:19792784

  2. Large Hadron Collider probe of supersymmetric neutrinoless double beta decay mechanism

    E-print Network

    B. C. Allanach; C. H. Kom; H. Päs

    2009-02-26

    In the minimal supersymmetric extension to the Standard Model, a non-zero lepton number violating coupling lambda'_111 predicts both neutrinoless double beta decay and resonant single slepton production at the LHC. We show that, in this case, if neutrinoless double beta decay is discovered in the next generation of experiments, there exist good prospects to observe single slepton production at the LHC. Neutrinoless double beta decay could otherwise result from a different source (such as a non-zero Majorana neutrino mass). Resonant single slepton production at the LHC can therefore discriminate between the lambda'_111 neutrinoless double beta decay mechanism and others.

  3. Dark resonance

    SciTech Connect

    An, Haipeng; Pospelov, Maxim, E-mail: han@perimeterinstitute.ca, E-mail: mpospelov@perimeterinstitute.ca [Perimeter Institute for Theoretical Physics, Waterloo, ON, N2J 2W9 (Canada)

    2012-11-01

    We construct explicit models of particle dark matter where the attractive force in the dark matter sector creates a narrow near-threshold resonance that qualitatively changes the energy dependence of the annihilation cross section. In these models, the resonant enhancement of the dark matter annihilation can easily source the excess of energetic leptons observed by the PAMELA experiment. The distinct feature of these models is that by construction the enhancement of the annihilation cross section shuts off when the dark matter velocity falls below the typical Milky Way values, thus automatically satisfying constraints on dark matter annihilation imposed by the CMB anisotropies and gamma ray constraints from satellite galaxies. However, the resonant enhancement of annihilation can be probed through the most recent FERMI-LAT constraints on the diffuse galactic gamma ray emission.

  4. Observation of the resonant character of the Z(4430)(-) state.

    PubMed

    Aaij, R; Adeva, B; Adinolfi, M; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves, A A; Amato, S; Amerio, S; Amhis, Y; An, L; Anderlini, L; Anderson, J; Andreassen, R; Andreotti, M; Andrews, J E; Appleby, R B; Aquines Gutierrez, O; Archilli, F; Artamonov, A; Artuso, M; Aslanides, E; Auriemma, G; Baalouch, M; Bachmann, S; Back, J J; Badalov, A; Balagura, V; Baldini, W; Barlow, R J; Barschel, C; Barsuk, S; Barter, W; Batozskaya, V; Bauer, Th; Bay, A; Beaucourt, L; Beddow, J; Bedeschi, F; Bediaga, I; Belogurov, S; Belous, K; Belyaev, I; Ben-Haim, E; Bencivenni, G; Benson, S; Benton, J; Berezhnoy, A; Bernet, R; Bettler, M-O; van Beuzekom, M; Bien, A; Bifani, S; Bird, T; Bizzeti, A; Bjørnstad, P M; Blake, T; Blanc, F; Blouw, J; Blusk, S; Bocci, V; Bondar, A; Bondar, N; Bonivento, W; Borghi, S; Borgia, A; Borsato, M; Bowcock, T J V; Bowen, E; Bozzi, C; Brambach, T; van den Brand, J; Bressieux, J; Brett, D; Britsch, M; Britton, T; Brodzicka, J; Brook, N H; Brown, H; Bursche, A; Busetto, G; Buytaert, J; Cadeddu, S; Calabrese, R; Calvi, M; Calvo Gomez, M; Camboni, A; Campana, P; Campora Perez, D; Carbone, A; Carboni, G; Cardinale, R; Cardini, A; Carranza-Mejia, H; Carson, L; Carvalho Akiba, K; Casse, G; Cassina, L; Castillo Garcia, L; Cattaneo, M; Cauet, Ch; Cenci, R; Charles, M; Charpentier, Ph; Chen, S; Cheung, S-F; Chiapolini, N; Chrzaszcz, M; Ciba, K; Cid Vidal, X; Ciezarek, G; Clarke, P E L; Clemencic, M; Cliff, H V; Closier, J; Coco, V; Cogan, J; Cogneras, E; Collins, P; Comerma-Montells, A; Contu, A; Cook, A; Coombes, M; Coquereau, S; Corti, G; Corvo, M; Counts, I; Couturier, B; Cowan, G A; Craik, D C; Cruz Torres, M; Cunliffe, S; Currie, R; D'Ambrosio, C; Dalseno, J; David, P; David, P N Y; Davis, A; De Bruyn, K; De Capua, S; De Cian, M; De Miranda, J M; De Paula, L; De Silva, W; De Simone, P; Decamp, D; Deckenhoff, M; Del Buono, L; Déléage, N; Derkach, D; Deschamps, O; Dettori, F; Di Canto, A; Dijkstra, H; Donleavy, S; Dordei, F; Dorigo, M; Dosil Suárez, A; Dossett, D; Dovbnya, A; Dujany, G; Dupertuis, F; Durante, P; Dzhelyadin, R; Dziurda, A; Dzyuba, A; Easo, S; Egede, U; Egorychev, V; Eidelman, S; Eisenhardt, S; Eitschberger, U; Ekelhof, R; Eklund, L; El Rifai, I; Elsasser, Ch; Ely, S; Esen, S; Evans, T; Falabella, A; Färber, C; Farinelli, C; Farley, N; Farry, S; Ferguson, D; Fernandez Albor, V; Ferreira Rodrigues, F; Ferro-Luzzi, M; Filippov, S; Fiore, M; Fiorini, M; Firlej, M; Fitzpatrick, C; Fiutowski, T; Fontana, M; Fontanelli, F; Forty, R; Francisco, O; Frank, M; Frei, C; Frosini, M; Fu, J; Furfaro, E; Gallas Torreira, A; Galli, D; Gallorini, S; Gambetta, S; Gandelman, M; Gandini, P; Gao, Y; Garofoli, J; Garra Tico, J; Garrido, L; Gaspar, C; Gauld, R; Gavardi, L; Gersabeck, E; Gersabeck, M; Gershon, T; Ghez, Ph; Gianelle, A; Giani', S; Gibson, V; Giubega, L; Gligorov, V V; Göbel, C; Golubkov, D; Golutvin, A; Gomes, A; Gordon, H; Gotti, C; Grabalosa Gándara, M; Graciani Diaz, R; Granado Cardoso, L A; Graugés, E; Graziani, G; Grecu, A; Greening, E; Gregson, S; Griffith, P; Grillo, L; Grünberg, O; Gui, B; Gushchin, E; Guz, Yu; Gys, T; Hadjivasiliou, C; Haefeli, G; Haen, C; Haines, S C; Hall, S; Hamilton, B; Hampson, T; Han, X; Hansmann-Menzemer, S; Harnew, N; Harnew, S T; Harrison, J; Hartmann, T; He, J; Head, T; Heijne, V; Hennessy, K; Henrard, P; Henry, L; Hernando Morata, J A; van Herwijnen, E; Heß, M; Hicheur, A; Hill, D; Hoballah, M; Hombach, C; Hulsbergen, W; Hunt, P; Hussain, N; Hutchcroft, D; Hynds, D; Idzik, M; Ilten, P; Jacobsson, R; Jaeger, A; Jalocha, J; Jans, E; Jaton, P; Jawahery, A; Jezabek, M; Jing, F; John, M; Johnson, D; Jones, C R; Joram, C; Jost, B; Jurik, N; Kaballo, M; Kandybei, S; Kanso, W; Karacson, M; Karbach, T M; Kelsey, M; Kenyon, I R; Ketel, T; Khanji, B; Khurewathanakul, C; Klaver, S; Kochebina, O; Kolpin, M; Komarov, I; Koopman, R F; Koppenburg, P; Korolev, M; Kozlinskiy, A; Kravchuk, L; Kreplin, K; Kreps, M; Krocker, G; Krokovny, P; Kruse, F; Kucharczyk, M; Kudryavtsev, V; Kurek, K; Kvaratskheliya, T; La Thi, V N; Lacarrere, D; Lafferty, G; Lai, A; Lambert, D; Lambert, R W; Lanciotti, E; Lanfranchi, G; Langenbruch, C; Langhans, B; Latham, T; Lazzeroni, C; Le Gac, R; van Leerdam, J; Lees, J-P; Lefèvre, R; Leflat, A; Lefrançois, J; Leo, S; Leroy, O; Lesiak, T; Leverington, B; Li, Y; Liles, M; Lindner, R; Linn, C; Lionetto, F; Liu, B; Liu, G; Lohn, S; Longstaff, I; Lopes, J H; Lopez-March, N; Lowdon, P; Lu, H; Lucchesi, D; Luo, H; Lupato, A; Luppi, E; Lupton, O; Machefert, F; Machikhiliyan, I V; Maciuc, F; Maev, O; Malde, S; Manca, G; Mancinelli, G; Manzali, M; Maratas, J; Marchand, J F; Marconi, U; Marin Benito, C; Marino, P; Märki, R; Marks, J; Martellotti, G; Martens, A; Martín Sánchez, A; Martinelli, M; Martinez Santos, D; Martinez Vidal, F; Martins Tostes, D

    2014-06-01

    Resonant structures in B^{0}??^{'}?^{-}K^{+} decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3??fb^{-1} collected with the LHCb detector. The data cannot be described with K^{+}?^{-} resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)^{-}??^{'}?^{-} component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)^{-} amplitude with the ?^{'}?^{-} mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1^{+}. PMID:24949760

  5. New physics in resonant production of Higgs boson pairs

    E-print Network

    Vernon Barger; Lisa L. Everett; C. B. Jackson; Andrea Peterson; Gabe Shaughnessy

    2014-07-31

    We advocate a search for an extended scalar sector at the LHC via $hh$ production, where $h$ is the 125 GeV Higgs boson. A resonance feature in the $hh$ invariant mass is a smoking gun of an $s$-channel heavy Higgs resonance, $H$. With one $h$ decaying to two photons and the other decaying to $b$-quarks, the resonant signal may be discoverable above the $hh$ continuum background for $M_H<$ 1 TeV. The product of the scalar and top Yukawa couplings can be measured to better than $10-20\\%$ accuracy, and its sign can be inferred from the $hh$ lineshape via interference effects.

  6. Search for the decay D0??+?-?+?-

    NASA Astrophysics Data System (ADS)

    Aaij, R.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; Anderlini, L.; Anderson, J.; Andreassen, R.; Andrews, J. E.; Appleby, R. B.; Aquines Gutierrez, O.; Archilli, F.; Artamonov, A.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Bachmann, S.; Back, J. J.; Badalov, A.; Baesso, C.; Balagura, V.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Bauer, Th.; Bay, A.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Belogurov, S.; Belous, K.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; Benson, S.; Benton, J.; Berezhnoy, A.; Bernet, R.; Bettler, M.-O.; van Beuzekom, M.; Bien, A.; Bifani, S.; Bird, T.; Bizzeti, A.; Bjørnstad, P. M.; Blake, T.; Blanc, F.; Blouw, J.; Blusk, S.; Bocci, V.; Bondar, A.; Bondar, N.; Bonivento, W.; Borghi, S.; Borgia, A.; Bowcock, T. J. V.; Bowen, E.; Bozzi, C.; Brambach, T.; van den Brand, J.; Bressieux, J.; Brett, D.; Britsch, M.; Britton, T.; Brook, N. H.; Brown, H.; Bursche, A.; Busetto, G.; Buytaert, J.; Cadeddu, S.; Callot, O.; Calvi, M.; Calvo Gomez, M.; Camboni, A.; Campana, P.; Campora Perez, D.; Carbone, A.; Carboni, G.; Cardinale, R.; Cardini, A.; Carranza-Mejia, H.; Carson, L.; Carvalho Akiba, K.; Casse, G.; Castillo Garcia, L.; Cattaneo, M.; Cauet, Ch.; Cenci, R.; Charles, M.; Charpentier, Ph.; Cheung, S.-F.; Chiapolini, N.; Chrzaszcz, M.; Ciba, K.; Cid Vidal, X.; Ciezarek, G.; Clarke, P. E. L.; Clemencic, M.; Cliff, H. V.; Closier, J.; Coca, C.; Coco, V.; Cogan, J.; Cogneras, E.; Collins, P.; Comerma-Montells, A.; Contu, A.; Cook, A.; Coombes, M.; Coquereau, S.; Corti, G.; Couturier, B.; Cowan, G. A.; Craik, D. C.; Cruz Torres, M.; Cunliffe, S.; Currie, R.; D'Ambrosio, C.; David, P.; David, P. N. Y.; Davis, A.; De Bonis, I.; De Bruyn, K.; De Capua, S.; De Cian, M.; De Miranda, J. M.; De Paula, L.; De Silva, W.; De Simone, P.; Decamp, D.; Deckenhoff, M.; Del Buono, L.; Déléage, N.; Derkach, D.; Deschamps, O.; Dettori, F.; Di Canto, A.; Dijkstra, H.; Dogaru, M.; Donleavy, S.; Dordei, F.; Dosil Suárez, A.; Dossett, D.; Dovbnya, A.; Dupertuis, F.; Durante, P.; Dzhelyadin, R.; Dziurda, A.; Dzyuba, A.; Easo, S.; Egede, U.; Egorychev, V.; Eidelman, S.; van Eijk, D.; Eisenhardt, S.; Eitschberger, U.; Ekelhof, R.; Eklund, L.; El Rifai, I.; Elsasser, Ch.; Falabella, A.; Färber, C.; Farinelli, C.; Farry, S.; Ferguson, D.; Fernandez Albor, V.; Ferreira Rodrigues, F.; Ferro-Luzzi, M.; Filippov, S.; Fiore, M.; Fitzpatrick, C.; Fontana, M.; Fontanelli, F.; Forty, R.; Francisco, O.; Frank, M.; Frei, C.; Frosini, M.; Furfaro, E.; Gallas Torreira, A.; Galli, D.; Gandelman, M.; Gandini, P.; Gao, Y.; Garofoli, J.; Garosi, P.; Garra Tico, J.; Garrido, L.; Gaspar, C.; Gauld, R.; Gersabeck, E.; Gersabeck, M.; Gershon, T.; Ghez, Ph.; Gibson, V.; Giubega, L.; Gligorov, V. V.; Göbel, C.; Golubkov, D.; Golutvin, A.; Gomes, A.; Gorbounov, P.; Gordon, H.; Grabalosa Gándara, M.; Graciani Diaz, R.; Granado Cardoso, L. A.; Graugés, E.; Graziani, G.; Grecu, A.; Greening, E.; Gregson, S.; Griffith, P.; Grillo, L.; Grünberg, O.; Gui, B.; Gushchin, E.; Guz, Yu.; Gys, T.; Hadjivasiliou, C.; Haefeli, G.; Haen, C.; Haines, S. C.; Hall, S.; Hamilton, B.; Hampson, T.; Hansmann-Menzemer, S.; Harnew, N.; Harnew, S. T.; Harrison, J.; Hartmann, T.; He, J.; Head, T.; Heijne, V.; Hennessy, K.; Henrard, P.; Hernando Morata, J. A.; van Herwijnen, E.; Heß, M.; Hicheur, A.; Hicks, E.; Hill, D.; Hoballah, M.; Hombach, C.; Hulsbergen, W.; Hunt, P.; Huse, T.; Hussain, N.; Hutchcroft, D.; Hynds, D.; Iakovenko, V.; Idzik, M.; Ilten, P.; Jacobsson, R.; Jaeger, A.; Jans, E.; Jaton, P.; Jawahery, A.; Jing, F.; John, M.; Johnson, D.; Jones, C. R.; Joram, C.; Jost, B.; Kaballo, M.; Kandybei, S.; Kanso, W.; Karacson, M.; Karbach, T. M.; Kenyon, I. R.; Ketel, T.; Khanji, B.; Kochebina, O.; Komarov, I.; Koopman, R. F.; Koppenburg, P.; Korolev, M.; Kozlinskiy, A.; Kravchuk, L.; Kreplin, K.; Kreps, M.; Krocker, G.; Krokovny, P.; Kruse, F.; Kucharczyk, M.; Kudryavtsev, V.; Kurek, K.; Kvaratskheliya, T.; La Thi, V. N.; Lacarrere, D.; Lafferty, G.; Lai, A.; Lambert, D.; Lambert, R. W.; Lanciotti, E.; Lanfranchi, G.; Langenbruch, C.; Latham, T.; Lazzeroni, C.; Le Gac, R.; van Leerdam, J.; Lees, J.-P.; Lefèvre, R.; Leflat, A.; Lefrançois, J.; Leo, S.; Leroy, O.; Lesiak, T.; Leverington, B.; Li, Y.; Li Gioi, L.; Liles, M.; Lindner, R.; Linn, C.; Liu, B.; Liu, G.; Lohn, S.; Longstaff, I.; Lopes, J. H.; Lopez-March, N.; Lu, H.; Lucchesi, D.; Luisier, J.; Luo, H.; Lupton, O.; Machefert, F.; Machikhiliyan, I. V.; Maciuc, F.; Maev, O.; Malde, S.; Manca, G.; Mancinelli, G.; Maratas, J.; Marconi, U.; Marino, P.; Märki, R.; Marks, J.; Martellotti, G.; Martens, A.

    2014-01-01

    A search for the D0??+?-?+?- decay, where the muon pair does not originate from a resonance, is performed using proton-proton collision data corresponding to an integrated luminosity of 1.0 fb recorded by the LHCb experiment at a centre-of-mass energy of 7 TeV. No signal is observed and an upper limit on the relative branching fraction with respect to the resonant decay mode D0??+?-?(??+?-), under the assumption of a phase-space model, is found to be B(D0??+?-?+?-)/B(D0??+?-?(??+?-))<0.96 at 90% confidence level. The upper limit on the absolute branching fraction is evaluated to be B(D0??+?-?+?-)<5.5×10-7 at 90% confidence level. This is the most stringent to date.

  7. Evolution of Nova TrA 2008 into a High Mass-Accretion Rate Post-Nova

    NASA Astrophysics Data System (ADS)

    Walter, Frederick M.

    2015-06-01

    NR TrA (Nova TrA 2008) was a normal slow Fe II novae for its first year of evolution. During its third year eclipses appeared, and optical spectra revealed the presence of hot permitted lines of C IV, N V, and O VI in addition to the usual nebular lines. The light curve and spectra resemble those of the V Sge stars. The orbital period is 5.25 hours. The time-resolved spectra show a prominent S-wave in the hot lines with an amplitude of about 100 km/s. We conclude that the system is a CV with a high mass accretion rate that has persisted for some 6 years after the explosion.

  8. Monitoring ligand modulation of protein-protein interactions by chemical cross-linking and High-Mass MALDI mass spectrometry.

    PubMed

    Gasilova, Natalia; Nazabal, Alexis

    2012-01-01

    Analyzing the effect of ligands on protein-protein interactions is important to better understand the cellular processes. In vitro characterization of these modulations remains challenging because of the drawbacks associated with the analysis of noncovalent interactions. To facilitate the analysis, stabilization of the protein complex by chemical cross-linking followed by High-Mass MALDI mass spectrometry is a recently developed method offering several advantages: No need for immobilization or special tags, the analysis is possible directly on wild-type protein complexes, no need for buffer exchange, large applicability range for any type of protein complex from 0 to 1,500 kDa. Using this method, we analyzed the effect of the inhibitors Nutlin-3a and Nutlin-3b on the protein complex MDM2-p53. Using this fast and sensitive method, the IC(50) values of these inhibitors have been determined. PMID:22065228

  9. Dark Resonance

    E-print Network

    Haipeng An; Maxim Pospelov

    2012-06-11

    We construct explicit models of particle dark matter where the attractive force in the dark matter sector creates a narrow near-threshold resonance that qualitatively changes the energy dependence of the annihilation cross section. In these models, the resonant enhancement of the dark matter annihilation can easily source the excess of energetic leptons observed by experiments on PAMELA and FERMI satellites. The distinct feature of these models is that by construction the enhancement of the annihilation cross section shuts off when the dark matter velocity falls below the typical Milky Way values, thus automatically satisfying constraints on dark matter annihilation imposed by the CMB anisotropies and gamma ray constraints from satellite galaxies.

  10. A new quark-hadron hybrid equation of state for astrophysics. I. High-mass twin compact stars

    NASA Astrophysics Data System (ADS)

    Beni?, Sanjin; Blaschke, David; Alvarez-Castillo, David E.; Fischer, Tobias; Typel, Stefan

    2015-05-01

    Aims: We present a new microscopic hadron-quark hybrid equation of state model for astrophysical applications, from which compact hybrid star configurations are constructed. These are composed of a quark core and a hadronic shell with a first-order phase transition at their interface. The resulting mass-radius relations are in accordance with the latest astrophysical constraints. Methods: The quark matter description is based on a quantum chromodynamics (QCD) motivated chiral approach with higher-order quark interactions in the Dirac scalar and vector coupling channels. For hadronic matter we select a relativistic mean-field equation of state with density-dependent couplings. Since the nucleons are treated in the quasi-particle framework, an excluded volume correction has been included for the nuclear equation of state at suprasaturation density which takes into account the finite size of the nucleons. Results: These novel aspects, excluded volume in the hadronic phase and the higher-order repulsive interactions in the quark phase, lead to a strong first-order phase transition with large latent heat, i.e. the energy-density jump at the phase transition, which fulfils a criterion for a disconnected third-family branch of compact stars in the mass-radius relationship. These twin stars appear at high masses (~2 M?) that are relevant for current observations of high-mass pulsars. Conclusions: This analysis offers a unique possibility by radius observations of compact stars to probe the QCD phase diagram at zero temperature and large chemical potential and even to support the existence of a critical point in the QCD phase diagram.

  11. High-sensitivity survey of a pole-on disk-jet system around high mass YSOs

    NASA Astrophysics Data System (ADS)

    Motogi, Kazuhito; Walsh, Andrew; Hirota, Tomoya; Niinuma, Kotaro; Sugiyama, Koichiro; Fujisawa, Kenta; Yonekura, Yoshinori; Honma, Mareki; Sorai, Kazuo

    2013-10-01

    Recent theoretical works have suggested that detailed evolution of a high mass protostellar object highly depends on effective accretion rate and exact accretion geometry. Observational studies of the innermost accretion properties are, thus, an essential task in the ALMA era. High mass protostellar objects with a pole-on disk-jet system are, hence, excellent targets for such a study, since an outflow cavity reduces the total optical depth along the line-of-sight. Our previous studies have shown that some singular water maser sources called dominant blue-shifted masers (DBSMs) are plausible candidates of pole-on disk jet systems. There are, however, still two major problems as follows, (1) Some DBSMs can be a "fake", because of the significant variability of water masers. (2) It is difficult to verify the sources are really in pole-on geometry. The first problems can be checked with the thermal counterparts, and the second problem can be tested by morphologies of the class II CH3OH maser sources. We propose a high-sensitivity survey of real “pole-on” disk-jet systems towards the southern ten DBSMs. This new survey consists of multi-band observations between C/X/K/W bands. We will start from the C/X-continuum survey in this semester. Scientific goals in this semester are, (1) surveying radio jet activities with the C/X continuum emission, (2) estimating the inclination angle of disk-jet systems based on the morphologies of the CH3OH maser spots. (3) determining the exact positions of driving sources.

  12. Excess Higgs Production in Neutralino Decays

    E-print Network

    Kiel Howe; Prashant Saraswat

    2012-08-07

    The ATLAS and CMS experiments have recently claimed discovery of a Higgs boson-like particle at ~5 sigma confidence and are beginning to test the Standard Model predictions for its production and decay. In a variety of supersymmetric models, a neutralino NLSP can decay dominantly to the Higgs and the LSP. In natural SUSY models, a light third generation squark decaying through this chain can lead to large excess Higgs production while evading existing BSM searches. Such models can be observed at the 8 TeV LHC in channels exploiting the rare diphoton decays of the Higgs produced in the cascade decay. Identifying a diphoton resonance in association with missing energy, a lepton, or b-tagged jets is a promising search strategy for discovery of these models, and would immediately signal new physics involving production of a Higgs boson. We also discuss the possibility that excess Higgs production in these SUSY decays can be responsible for enhancements of up to 50% over the SM prediction for the observed rate in the existing inclusive diphoton searches, a scenario which would likely by the end of the 8 TeV run be accompanied by excesses in the diphoton + lepton/MET and SUSY multi-lepton/b searches and a potential discovery in a diphoton + 2b search.

  13. Test of CP invariance in Z?? +? ? ? decay

    Microsoft Academic Search

    M. Acciarri; O. Adriani; M. Aguilar-Benitez; S. Ahlen; J. Alcaraz; G. Alemanni; J. Allaby; A. Aloisio; M. G. Alviggi; G. Ambrosi; H. Anderhub; V. P. Andreev; T. Angelescu; F. Anselmo; A. Arefiev; T. Azemoon; T. Aziz; P. Bagnaia; L. Baksay; R. C. Ball; S. Banerjee; K. Banicz; A. Barczyk; R. Barillère; L. Barone; P. Bartalini; A. Baschirotto; M. Basile; R. Battiston; A. Bay; F. Becattini; U. Becker; F. Behner; J. Berdugo; P. Berges; B. Bertucci; B. L. Betev; S. Bhattacharya; M. Biasini; A. Biland; G. M. Bilei; J. J. Blaising; S. C. Blyth; G. J. Bobbink; R. Bock; A. Böhm; L. Boldizsar; B. Borgia; D. Bourilkov; M. Bourquin; D. Boutigny; S. Braccini; J. G. Branson; V. Brigljevic; I. C. Brock; A. Buffini; A. Buijs; J. D. Burger; W. J. Burger; J. Busenitz; X. D. Cai; M. Campanelli; M. Capell; G. Cara Romeo; G. Carlino; A. M. Cartacci; J. Casaus; G. Castellini; F. Cavallari; N. Cavallo; C. Cecchi; M. Cerrada; F. Cesaroni; M. Chamizo; Y. H. Chang; U. K. Chaturvedi; M. Chemarin; A. Chen; G. Chen; H. F. Chen; H. S. Chen; M. Chen; G. Chiefari; C. Y. Chien; L. Cifarelli; F. Cindolo; C. Civinini; I. Clare; R. Clare; G. Coignet; A. P. Colijn; N. Colino; S. Costantini; F. Cotorobai; B. de la Cruz; A. Csilling; T. S. Dai; R. D'Alessandro; R. de Asmundis; A. Degré; K. Deiters; P. Denes; F. DeNotaristefani; M. Diemoz; D. van Dierendonck; F. Di Lodovico; C. Dionisi; M. Dittmar; A. Dominguez; A. Doria; M. T. Dova; E. Drago; D. Duchesneau; P. Duinker; I. Duran; S. Easo; H. El Mamouni; A. Engler; F. J. Eppling; F. C. Erné; J. P. Ernenwein; P. Extermann; M. Fabre; R. Faccini; M. A. Falagan; S. Falciano; A. Favara; J. Fay; O. Fedin; M. Felcini; T. Ferguson; F. Ferroni; H. Fesefeldt; E. Fiandrini; J. H. Field; F. Filthaut; P. H. Fisher; I. Fisk; G. Forconi; L. Fredj; K. Freudenreich; C. Furetta; Yu. Galaktionov; S. N. Ganguli; P. Garcia-Abia; M. Gataullin; S. S. Gau; S. Gentile; J. Gerald; N. Gheordanescu; S. Giagu; S. Goldfarb; J. Goldstein; Z. F. Gong; A. Gougas; G. Gratta; M. W. Gruenewald; R. van Gulik; V. K. Gupta; A. Gurtu; L. J. Gutay; D. Haas; B. Hartmann; A. Hasan; D. Hatzifotiadou; T. Hebbeker; A. Hervé; P. Hidas; J. Hirschfelder; W. C. van Hoek; H. Hofer; H. Hoorani; S. R. Hou; G. Hu; I. Iashvili; B. N. Jin; L. W. Jones; P. de Jong; I. Josa-Mutuberria; A. Kasser; R. A. Khan; D. Kamrad; J. S. Kapustinsky; Y. Karyotakis; M. Kaur; M. N. Kienzle-Focacci; D. Kim; J. K. Kim; S. C. Kim; W. W. Kinnison; A. Kirkby; D. Kirkby; J. Kirkby; D. Kiss; W. Kittel; A. Klimentov; A. C. König; A. Kopp; I. Korolko; V. Koutsenko; R. W. Kraemer; W. Krenz; A. Kunin; P. Lacentre; P. Ladron de Guevara; G. Landi; C. Lapoint; K. Lassila-Perini; P. Laurikainen; A. Lavorato; M. Lebeau; A. Lebedev; P. Lebrun; P. Lecomte; P. Lecoq; P. Le Coultre; H. J. Lee; C. Leggett; J. M. Le Goff; R. Leiste; E. Leonardi; P. Levtchenko; C. Li; C. H. Lin; W. T. Lin; F. L. Linde; L. Lista; Z. A. Liu; W. Lohmann; E. Longo; W. Lu; Y. S. Lu; K. Lübelsmeyer; C. Luci; D. Luckey; L. Luminari; W. Lustermann; W. G. Ma; M. Maity; G. Majumder; L. Malgeri; A. Malinin; C. Maña; D. Mangeol; P. Marchesini; G. Marian; A. Marin; J. P. Martin; F. Marzano; G. G. G. Massaro; K. Mazumdar; S. Mele; L. Merola; M. Meschini; W. J. Metzger; M. von der Mey; Y. Mi; D. Migani; A. Mihul; A. J. W. van Mil; H. Milcent; G. Mirabelli; J. Mnich; P. Molnar; B. Monteleoni; R. Moore; T. Moulik; R. Mount; F. Muheim; A. J. M. Muijs; S. Nahn; M. Napolitano; F. Nessi-Tedaldi; H. Newman; T. Niessen; A. Nippe; A. Nisati; H. Nowak; Y. D. Oh; G. Organtini; R. Ostonen; S. Palit; C. Palomares; D. Pandoulas; S. Paoletti; P. Paolucci; H. K. Park; I. H. Park; G. Pascale; G. Passaleva; S. Patricelli; T. Paul; M. Pauluzzi; C. Paus; F. Pauss; D. Peach; Y. J. Pei; S. Pensotti; D. Perret-Gallix; B. Petersen; S. Petrak; A. Pevsner; D. Piccolo; M. Pieri; P. A. Piroué; E. Pistolesi; V. Plyaskin; M. Pohl; V. Pojidaev; H. Postema; J. Pothier; N. Produit; D. Prokofiev; J. Quartieri; G. Rahal-Callot; N. Raja; P. G. Rancoita; M. Rattaggi; G. Raven; P. Razis; D. Ren; M. Rescigno; S. Reucroft; T. van Rhee; S. Riemann; K. Riles; O. Rind; A. Robohm; J. Rodin; B. P. Roe; L. Romero; S. Rosier-Lees; Ph. Rosselet; S. Roth; J. A. Rubio; D. Ruschmeier; H. Rykaczewski; S. Sakar; J. Salicio; E. Sanchez; M. P. Sanders; M. E. Sarakinos; G. Sauvage; C. Schäfer; V. Schegelsky; S. Schmidt-Kaerst; D. Schmitz; M. Schneegans; N. Scholz; H. Schopper; D. J. Schotanus; J. Schwenke; G. Schwering; C. Sciacca; D. Sciarrino; L. Servoli; S. Shevchenko; N. Shivarov; V. Shoutko; J. Shukla; E. Shumilov; A. Shvorob; T. Siedenburg; D. Son; V. Soulimov; B. Smith; P. Spillantini; M. Steuer; D. P. Stickland; H. Stone; B. Stoyanov; A. Straessner; K. Sudhakar; G. Sultanov; L. Z. Sun; G. F. Susinno; H. Suter; J. D. Swain; X. W. Tang; L. Tauscher; L. Taylor; C. Timmermans; Samuel C. C. Ting; S. M. Ting; S. C. Tonwar; J. Tóth

    1998-01-01

    We report on the first test of CP invariance in Z decays with hard photon radiation. The data recorded with the L3 detector at centre-of-mass energies near the Z resonance are used to search for CP violation in the reaction e+e???+???. No evidence for CP violation is found and limits on the CP-violating form factors f?A and f?V are derived.

  14. NLO QCD corrections to production with leptonic decays in the light of top quark mass and asymmetry measurements

    NASA Astrophysics Data System (ADS)

    Heinrich, Gudrun; Maier, Andreas; Nisius, Richard; Schlenk, Johannes; Winter, Jan

    2014-06-01

    We present the NLO QCD corrections to the processes pp and including leptonic decays of the W bosons. Non-resonant contributions as well as diagrams with doubly resonant and singly resonant top quark propagators are fully taken into account. We employ the narrow width approximation to perform the decays of the W bosons; spin correlations are however preserved. We also calculate observables relevant for top quark mass measurements, and study the impact of kinematical requirements and different scale choices on asymmetries.

  15. Building Resonance

    NSDL National Science Digital Library

    Jeffrey Barker

    This demonstration of how buildings respond to seismic shaking uses cardboard and stiff paper (such as postcards or computer cards). The effects of building resonance can be found by experimenting with taller and shorter buildings, and varying the frequency of shaking.

  16. Decay of Resonaces in Strong Magnetic Field

    E-print Network

    Peter Filip

    2015-04-27

    We suggest that decay properties (branching ratios) of hadronic resonances may become modified in strong external magnetic field. The behavior of $K^{\\pm *}\\!$, $K^{0*}$ vector mesons as well as $\\Lambda^*(1520)$ and $\\Xi^{0*}$ baryonic states is considered in static fields $10^{13}$-\\,$10^{15}$ T. In particular, $n=0$ Landau level energy increase of charged particles in the external magnetic field, and the interaction of hadron magnetic moments with the field is taken into account. We suggest that enhanced yield of dileptons and photons from $\\rho^0(770)$ mesons may occur if strong decay channel $\\rho^0 \\rightarrow \\pi^+\\pi^-$ is significantly suppressed. CP - violating $\\pi^+\\pi^-$ decays of pseudoscalar $\\eta_c$ and $\\eta(547)$ mesons in the magnetic field are discussed, and superpositions of quarkonium states $\\eta_{c,b}$ and $\\chi_{c,b}(nP)$ with $\\Psi(nS), \\Upsilon(nS)$ mesons in the external field are considered.

  17. A search for lepton flavour violation in Z0 decays

    Microsoft Academic Search

    M. Z. Akrawy; Gideon Alexander; J. Allison; P. P. Allport; K. J. Anderson; J. C. Armitage; G. T. J. Arnison; P. Ashton; G. Azuelos; J. T. M. Baines; A. H. Ball; J. Banks; G. J. Barker; R. J. Barlow; J. R. Batley; A. Beck; J. Becker; T. Behnke; K. W. Bell; G. Bella; S. Bethke; O. Biebel; U. Binder; I. J. Bloodworth; P. Bock; H. Breuker; R. M. Brown; R Barillère; A. Buijs; H. J. Burckhart; P. Capiluppi; R. K. Carnegie; A. A. Carter; J. R. Carter; C. Y. Chang; D. G. Charlton; J. T. M. Chrin; P. E. L. Clarke; I. Cohen; W. J. Collins; J. E. Conboy; M. Couch; M. Coupland; M. Cuffiani; S. Dado; G. M. Dallavalle; P. Debu; M. M. Deninno; A. Dieckmann; M. Dittmar; M. S. Dixit; E. Duchovni; I. P. Duerdoth; D. J. P. Dumas; P. A. Elcombe; P. G. Estarbrooks; E. Etzion; F. Fabbri; P. Farthouat; H. M. Fischer; D. G. Fong; M. T. French; C. Fukunaga; A. Gaidot; O. Ganel; J. W. Gary; J. Gascon; N. I. Geddes; C. N. P. Gee; C. Geich-Gimbel; S. W. Gensler; F. X. Gentit; G. Giacomelli; V. Gibson; W. R. Gibson; J. D. Gillies; J. Goldberg; M. J. Goodrick; W. Gorn; D. Granite; E. Gross; J. Grunhaus; H. Hagedorn; J. Hagemann; M. Hansroul; C. K. Hargrove; I. Harrus; J. Hart; P. M. Hattersley; M. Hauschild; C. M. Hawkes; E. Heflin; R. J. Hemingway; R. D. Heuer; J. C. Hill; S. J. Hillier; C. Ho; J. D. Hobbs; P. R. Hobson; D. Hochman; B. Holl; R. J. Homer; S. R. Hou; C. P. Howarth; R. E. Hughes-Jones; R. Humbert; P. Igo-Kemenes; H. Ihssen; D. C. Imrie; L. Janissen; A. Jawahery; P. W. Jeffreys; H. Jeremie; M. Jimack; M. Jobes; R. W. L. Jones; P. Jovanovic; D. Karlen; K. Kawagoe; T. Kawamoto; R. G. Kellogg; B. W. Kennedy; C. Kleinwort; D. E. Klem; G. Knop; T. Kobayashi; T. P. Kokott; L. Köpke; R. Kowalewski; H. Kreutzmann; J. Kroll; M. Kuwano; P. Kyberd; G. D. Lafferty; F. Lamarche; W. J. Larson; J. G. Layter; P. Le Du; P. Leblanc; A. M. Lee; M. H. Lehto; D. Lellouch; P. Lennert; L. Lessard; L. Levinson; S. L. Lloyd; F. K. Loebinger; J. M. Lorah; B. Lorazo; M. J. Losty; J. Ludwig; J. Ma; A. A. MacBeth; M. Mannelli; S. Marcellino; G. Maringer; A. J. Martin; J. P. Martin; T. Mashimo; P. Mättig; U. Maur; T. J. McMahon; J. R. McNutt; F. Meijers; D. Menszner; F. S. Merritt; H. Mes; A. Michelini; R. P. Middleton; G. Mikenberg; J. Mildenberger; D. J. Miller; C. Milstene; M. Minowa; W. Mohr; A. Montanari; T. Mori; M. W. Moss; P. G. Murphy; W. J. Murray; B. Nellen; H. H. Nguyen; M. Nozaki; A. J. P. O'Dowd; S. W. O'Neale; B. P. O'Neill; F. G. Oakham; F. Odorici; M. Ogg; H. Oh; M. J. Oreglia; S. Orito; J. P. Pansart; G. N. Patrick; S. J. Pawley; P. Pfister; J. E. Pilcher; J. L. Pinfold; D. E. Plane; B. Poli; A. Pouladdej; E. Prebys; T. W. Pritchard; G. Quast; J. Raab; M. W. Redmond; D. L. Rees; M. Regimbald; K. Riles; C. M. Roach; S. A. Robins; A. Rollnik; J. M. Roney; S. Rossberg; A. M. Rossi; P. Routenburg; K. Runge; O. Runolfsson; S. Sanghera; R. A. Sansum; M. Sasaki; B. J. Saunders; A. D. Schaile; O. Schaile; W. Schappert; P. Scharff-Hansen; S. Schreiber; J. Schwarz; A. Shapira; B. C. Shen; P. Sherwood; A. Simon; P. Singh; G. P. Siroli; A. Skuja; A. M. Smith; T. J. Smith; G. A. Snow; R. W. Springer; M. Sproston; K. Stephens; H. E. Stier; R. Stroehmer; D. Strom; H. Takeda; T. Takeshita; P. Taras; N. J. Thackray; T. Tsukamoto; M. F. Turner; G. Tysarczyk-Niemeyer; D. van den Plas; G. J. Vandalen; R. van Kooten; G. Vasseur; C. J. Virtue; H. von der Schmitt; J. von Krogh; A. Wagner; C. Wahl; J. P. Walker; C. P. Ward; D. R. Ward; P. M. Watkins; A. T. Watson; N. K. Watson; M. Weber; S. Weisz; P. S. Wells; N. Wermes; M. Weymann; G. W. Wilson; J. A. Wilson; I. Wingerter; V.-H. Winterer; N. C. Wood; S. Wotton; B. Wuensch; T. R. Wyatt; R. Yaari; Y. Yang; G. Yekutieli; T. Yoshida; W. Zeuner; G. T. Zorn; J Mnich; M Möller; B Monteleoni; G Morand; R Morand; S Morganti; N E Moulai; R Mount; S Müller; E Nagy; M Napolitano; H Newman; C Neyer; M A Niaz; L Niessen; Wolf-Dieter Nowak; D Pandoulas; M Pauluzzi; Felicitas Pauss; F Plasil; G Passaleva; S Patricelli; Y J Pei; D Perret-Gallix; J Perrier; A Pevsner; M Pieri; P A Piroué; V Plyaskin; M Pohl; V Pozhidaev; N Produit; J M Qian; K N Qureshi; R Raghavan; G Rahal-Callot; G Raven; P A Razis; K Read; D Ren; Z Ren; S Reucroft; A Ricker; S Riemann; O Rind; C Rippich; H A Rizvi; B P Roe; M Röhner; S Röhner; L Romero; J Rose; S Rosier-Lees; R Rosmalen; P Rosselet; André Rubbia; Juan Antonio Rubio; W Rückstuhl; H Rykaczewski; M Sachwitz; J Salicio; G Sanders; A Santocchia; M E Sarakinos; G Sartorelli; G Sauvage; A Savin; V Shchegelskii; K Schmiemann; D Schmitz; P Schmitz; M Schneegans; Herwig Franz Schopper; D J Schotanus; S Shotkin; H J Schreiber; R Schulte; S Schulte; K Schultze; J Schütte; J Schwenke; G Schwering; C Sciacca; I Scott; R. B. Sutton; P G Seiler; Johannes C Sens; L Servoli; I Sheer; D Z Shen; V Shevchenko; S Shevchenko; X R Shi; K D Shmakov; V Shoutko

    1991-01-01

    We have searched for lepton flavour violation in about 14000 Z0 decays into collinear lepton pairs, recorded in an energy scan around the Z0 resonance. Decays of the type Z0-->etau, Z0-->mutau and Z0-->emu have been considered. Observed candidates in the etau and mutau modes are consistent with expected Z0-->tau+tau- backgrounds; no candidates are observed for the emu mode. We obtain

  18. Site-selective participator decay of core-excited butadiene

    Microsoft Academic Search

    S. L. Sorensen; S. J. Osborne; A. Ausmees; A. Kikas; N. Correia; S. Svensson; A. Naves de Brito; P. Persson; S. Lunell

    1996-01-01

    The decay of core-excited electronic states in free 1,3 trans butadiene molecules has been studied using high-resolution synchrotron radiation and electron spectrometry. The core-level energy shift between the terminal and central carbon atoms is 0.64 eV making selective excitation of core electrons from these atoms possible. Resonant excitation to the au(?*) valence state leads to autoionizing decay channels which proceed

  19. Observation of the Decay B --> Kl+l-

    Microsoft Academic Search

    K. Abe; R. Abe; I. Adachi; Byoung Sup Ahn; H. Aihara; M. Akatsu; Y. Asano; T. Aso; V. Aulchenko; T. Aushev; A. M. Bakich; E. Banas; S. Behari; P. K. Behera; A. Bondar; A. Bozek; T. E. Browder; B. C. Casey; P. Chang; Y. Chao; B. G. Cheon; R. Chistov; S.-K. Choi; Y. Choi; L. Y. Dong; A. Drutskoy; S. Eidelman; Y. Enari; F. Fang; H. Fujii; C. Fukunaga; M. Fukushima; N. Gabyshev; A. Garmash; T. Gershon; A. Gordon; K. Gotow; R. Guo; J. Haba; H. Hamasaki; K. Hanagaki; F. Handa; K. Hara; T. Hara; N. C. Hastings; H. Hayashii; M. Hazumi; E. M. Heenan; I. Higuchi; T. Higuchi; H. Hirano; T. Hojo; T. Hokuue; Y. Hoshi; K. Hoshina; S. R. Hou; W.-S. Hou; S.-C. Hsu; H.-C. Huang; Y. Igarashi; T. Iijima; H. Ikeda; K. Inami; A. Ishikawa; H. Ishino; R. Itoh; H. Iwasaki; Y. Iwasaki; D. J. Jackson; H. K. Jang; H. Kakuno; J. Kaneko; J. H. Kang; J. S. Kang; P. Kapusta; N. Katayama; H. Kawai; N. Kawamura; T. Kawasaki; H. Kichimi; D. W. Kim; Heejong Kim; H. J. Kim; H. O. Kim; Hyunwoo Kim; S. K. Kim; K. Kinoshita; S. Kobayashi; H. Konishi; P. Krokovny; R. Kulasiri; S. Kumar; A. Kuzmin; Y.-J. Kwon; J. S. Lange; G. Leder; S. H. Lee; D. Liventsev; R.-S. Lu; J. MacNaughton; T. Matsubara; S. Matsumoto; T. Matsumoto; Y. Mikami; K. Miyabayashi; H. Miyake; H. Miyata; G. R. Moloney; G. F. Moorhead; S. Mori; T. Mori; A. Murakami; T. Nagamine; Y. Nagasaka; Y. Nagashima; T. Nakadaira; E. Nakano; M. Nakao; J. W. Nam; Z. Natkaniec; K. Neichi; S. Nishida; O. Nitoh; S. Noguchi; T. Nozaki; S. Ogawa; T. Ohshima; T. Okabe; S. Okuno; S. L. Olsen; W. Ostrowicz; H. Ozaki; P. Pakhlov; H. Palka; C. S. Park; C. W. Park; K. S. Park; L. S. Peak; M. Peters; L. E. Piilonen; J. L. Rodriguez; N. Root; M. Rozanska; K. Rybicki; J. Ryuko; H. Sagawa; Y. Sakai; H. Sakamoto; A. Satpathy; S. Schrenk; S. Semenov; K. Senyo; M. E. Sevior; H. Shibuya; B. Schwartz; S. Stanic; A. Sugi; A. Sugiyama; K. Sumisawa; T. Sumiyoshi; K. Suzuki; S. Suzuki; S. K. Swain; H. Tajima; T. Takahashi; F. Takasaki; M. Takita; K. Tamai; N. Tamura; J. Tanaka; M. Tanaka; Y. Tanaka; G. N. Taylor; Y. Teramoto; M. Tomoto; T. Tomura; S. N. Tovey; K. Trabelsi; T. Tsuboyama; T. Tsukamoto; S. Uehara; K. Ueno; Y. Unno; S. Uno; Y. Ushiroda; K. E. Varvell; C. C. Wang; J. G. Wang; M.-Z. Wang; Y. Watanabe; E. Won; B. D. Yabsley; Y. Yamada; M. Yamaga; A. Yamaguchi; H. Yamamoto; Y. Yamashita; M. Yamauchi; J. Yashima; M. Yokoyama; K. Yoshida; Y. Yusa; H. Yuta; C. C. Zhang; J. Zhang; H. W. Zhao; Y. Zheng; V. Zhilich; D. Zontar

    2002-01-01

    We report a search for the flavor-changing neutral current decay B-->K(*)l+l- using a 29.1 fb-1 data sample accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- storage ring. We observe the decay process B-->Kl+l-(l = e,mu), for the first time, with a branching fraction of B(B-->Kl+l-) = (0.75+0.25-0.21+\\/-0.09)×10-6.

  20. Measurement of CP-violating parameters in B? ?? K decays

    Microsoft Academic Search

    K.-F. Chen; K. Hara; K. Abe; T. Abe; I. Adachi; Byoung Sup Ahn; H. Aihara; M. Akatsu; Y. Asano; T. Aso; V. Aulchenko; T. Aushev; A. M. Bakich; Y. Ban; A. Bay; I. Bedny; P. K. Behera; I. Bizjak; A. Bondar; A. Bozek; M. Bra?ko; J. Brodzicka; T. E. Browder; B. C. K. Casey; P. Chang; Y. Chao; B. G. Cheon; R. Chistov; S.-K. Choi; Y. Choi; M. Danilov; L. Y. Dong; J. Dragic; S. Eidelman; V. Eiges; Y. Enari; F. Fang; C. Fukunaga; N. Gabyshev; A. Garmash; T. Gershon; B. Golob; A. Gordon; R. Guo; J. Haba; K. Hanagaki; F. Handa; T. Hara; N. C. Hastings; H. Hayashii; M. Hazumi; E. M. Heenan; I. Higuchi; T. Higuchi; L. Hinz; Y. Hoshi; W.-S. Hou; Y. B. Hsiung; S.-C. Hsu; H.-C. Huang; T. Igaki; Y. Igarashi; T. Iijima; K. Inami; A. Ishikawa; R. Itoh; H. Iwasaki; Y. Iwasaki; H. K. Jang; J. H. Kang; J. S. Kang; N. Katayama; H. Kawai; Y. Kawakami; N. Kawamura; H. Kichimi; D. W. Kim; Heejong Kim; H. J. Kim; Hyunwoo Kim; T. H. Kim; K. Kinoshita; S. Korpar; P. Križan; P. Krokovny; R. Kulasiri; S. Kumar; A. Kuzmin; Y.-J. Kwon; J. S. Lange; G. Leder; S. H. Lee; J. Li; R.-S. Lu; J. MacNaughton; G. Majumder; F. Mandl; D. Marlow; T. Matsuishi; S. Matsumoto; T. Matsumoto; K. Miyabayashi; Y. Miyabayashi; H. Miyata; G. R. Moloney; T. Mori; A. Murakami; T. Nagamine; Y. Nagasaka; T. Nakadaira; E. Nakano; M. Nakao; J. W. Nam; Z. Natkaniec; S. Nishida; O. Nitoh; S. Noguchi; S. Ogawa; T. Ohshima; T. Okabe; S. Okuno; S. L. Olsen; Y. Onuki; W. Ostrowicz; H. Ozaki; H. Palka; C. W. Park; L. S. Peak; J.-P. Perroud; M. Peters; L. E. Piilonen; N. Root; M. Rozanska; K. Rybicki; H. Sagawa; S. Saitoh; Y. Sakai; H. Sakamoto; M. Satapathy; A. Satpathy; O. Schneider; S. Schrenk; C. Schwanda; S. Semenov; K. Senyo; R. Seuster; M. E. Sevior; H. Shibuya; B. Shwartz; J. B. Singh; N. Soni; S. Stani?; M. Stari?; A. Sugi; A. Sugiyama; K. Sumisawa; T. Sumiyoshi; S. Suzuki; T. Takahashi; F. Takasaki; N. Tamura; J. Tanaka; M. Tanaka; G. N. Taylor; Y. Teramoto; S. Tokuda; M. Tomoto; T. Tomura; K. Trabelsi; W. Trischuk; T. Tsuboyama; T. Tsukamoto; S. Uehara; K. Ueno; Y. Unno; S. Uno; Y. Ushiroda; G. Varner; K. E. Varvell; C. C. Wang; J. G. Wang; M.-Z. Wang; Y. Watanabe; E. Won; B. D. Yabsley; Y. Yamada; A. Yamaguchi; Y. Yamashita; M. Yamauchi; H. Yanai; P. Yeh; M. Yokoyama; Y. Yuan; Y. Yusa; Z. P. Zhang; V. Zhilich; D. Žontar

    2002-01-01

    We present measurements of CP-violating parameters in B0(B0)???KS0 and B±???K± decays based on a 41.8 fb?1 data sample collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e? collider. We fully reconstruct one neutral B meson as a B0(B0)???KS0CP eigenstate and identify the flavor of the accompanying B from its decay products. From the distribution of

  1. Remarkable Features of Decaying Hagedorn States

    E-print Network

    M. Beitel; K. Gallmeister; C. Greiner

    2014-07-02

    Hagedorn states (HS) are a tool to model the hadronization process which occurs in the phase transition phase between the quark gluon plasma (QGP) and the hadron resonance gas (HRG). Their abundance is believed to appear near the Hagedorn temperature $T_H$ which in our understanding equals the critical temperature $T_c$. These hadron-like resonances are characterized by being very massive and by not being limited to quantum numbers of known hadrons. To generate a whole zoo of such new states we solve the covariantly formulated bootstrap equation by regarding energy conservation and conservation of the baryon number $B$, strangeness $S$ and electric charge $Q$. To investigate their decay properties decay chain calculations of HS were conducted. One single (heavy) HS with certain quantum numbers decays by various two-body decay channels subsequently into final stable hadrons. Multiplicities of these stable hadrons, their ratios and their energy distributions are presented. Strikingly the final energy spectra of resulting hadrons show a thermal-like distribution with the characteristic Hagedorn temperature $T_H$. All hadronic properties like masses, spectral functions etc. are taken from the hadronic transport model Ultra Relativistic Quantum Molecular Dynamics (UrQMD).

  2. Remarkable Features of Decaying Hagedorn States

    NASA Astrophysics Data System (ADS)

    Beitel, M.; Gallmeister, K.; Greiner, C.

    2014-09-01

    Hagedorn states (HS) are a tool to model the hadronization process which occurs in the phase transition phase between the quark gluon plasma (QGP) and the hadron resonance gas (HRG). Their abundance is believed to appear near the Hagedorn temperature TH which in our understanding equals the critical temperature Tc. These hadron-like resonances are characterized by being very massive and by not being limited to quantum numbers of known hadrons. To generate a whole zoo of such new states we solve the covariantly formulated bootstrap equation by regarding energy conservation and conservation of the baryon number B, strangeness S and electric charge Q. To investigate their decay properties decay chain calculations of HS were conducted. One single (heavy) HS with certain quantum numbers decays by various two-body decay channels subsequently into final stable hadrons. Multiplicities of these stable hadrons, their ratios and their energy distributions are presented. Strikingly the final energy spectra of resulting hadrons show a thermal-like distribution with the characteristic Hagedorn temperature TH. All hadronic properties like masses, spectral functions etc. are taken from the hadronic transport model Ultra Relativistic Quantum Molecular Dynamics (UrQMD).

  3. Six-lepton Z' resonance at the Large Hadron Collider.

    PubMed

    Barger, Vernon; Langacker, Paul; Lee, Hye-Sung

    2009-12-18

    New physics models admit the interesting possibility of a Z' weak boson associated with an extra U(1) gauge symmetry and a Higgs boson that is heavy enough to decay into a pair of Z bosons. Then Z' production and decay via Z' --> ZH --> ZZZ has a distinctive LHC signal that is nearly background-free and reconstructs the H and Z' masses and widths. The Z' decay to 3 pairs of leptons is especially distinctive. The ZH decay mode exists even if the Z' is decoupled from leptons, which motivates an independent 6-lepton resonance search regardless of the dilepton search results. PMID:20366250

  4. Selected protein monitoring in histological sections by targeted MALDI-FTICR in-source decay imaging.

    PubMed

    Calligaris, David; Longuespée, Rémi; Debois, Delphine; Asakawa, Daiki; Turtoi, Andrei; Castronovo, Vincent; Noël, Agnès; Bertrand, Virginie; De Pauw-Gillet, Marie-Claire; De Pauw, Edwin

    2013-02-19

    Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI MSI) is a rapidly growing method in biomedical research allowing molecular mapping of proteins on histological sections. The images can be analyzed in terms of spectral pattern to define regions of interest. However, the identification and the differential quantitative analysis of proteins require off line or in situ proteomic methods using enzymatic digestion. The rapid identification of biomarkers holds great promise for diagnostic research, but the major obstacle is the absence of a rapid and direct method to detect and identify with a sufficient dynamic range a set of specific biomarkers. In the current work, we present a proof of concept for a method allowing one to identify simultaneously a set of selected biomarkers on histological slices with minimal sample treatment using in-source decay (ISD) MSI and MALDI-Fourier transform ion cyclotron resonance (FTICR). In the proposed method, known biomarkers are spotted next to the tissue of interest, the whole MALDI plate being coated with 1,5-diaminonaphthalene (1,5-DAN) matrix. The latter enhances MALDI radical-induced ISD, providing large tags of the amino acid sequences. Comparative analysis of ISD fragments between the reference spots and the specimen in imaging mode allows for unambiguous identification of the selected biomarker while preserving full spatial resolution. Moreover, the high resolution/high mass accuracy provided by FTICR mass spectrometry allows the identification of proteins. Well-resolved peaks and precise measurements of masses and mass differences allow the construction of reliable sequence tags for protein identification. The method will allow the use of MALDI-FTICR MSI as a method for rapid targeted biomarker detection in complement to classical histology. PMID:23323725

  5. Structure of hyperon resonances

    SciTech Connect

    Umino, Y.

    1992-01-01

    Baryons are composite objects. Although this fact has been verified beyond doubt, the authors are far from understanding its internal structure using first principles based on Quantum Chromodynamics (QCD). This theory of strong interactions governs the dynamics of quarks and gluons with which the authors ultimately would like to describe nuclear physics. Any realistic model of baryons should therefore simulate QCD and somehow make connections to nuclear physics. In this work, the authors use a candidate for one such model, the chiral bag model, to examine whether it can offer any valuable insights into the structure of hyperon resonances, especially those that might play important roles in hypernuclear physics. The authors begin by calculating the mass spectrum of negative parity hyperons in this model calculation are discussed and an estimate is made of the magnitude of theoretical uncertainty in the results. After exploring how the masses and the spin-flavor compositions of the hyperon resonances are determined, the authors find a reasonable fit to the mass spectrum. However, a comparison with another model prediction indicates that this alone is insufficient to determine the structure of excited hyperons. Therefore, the authors calculate some strong interaction properties and radiative decay widths of the two lightest hyperon resonances. Both of these quantities are sensitive to the spin-flavor composition of the hyperons and the former are of interest to low energy KN interactions while the latter also test model dependent electromagnetic transition operators. The authors also comment on the complicated structure of the [Lambda](1405) and argue that experimental determination of hyperon radiative widths would provide an ideal probe to explore the structure of excited strange baryons.

  6. Search for the decay D[superscript 0] ? ?[superscript +]?[superscript -]?[superscript +]?[superscript -

    E-print Network

    Williams, Michael

    A search for the D[superscript 0]??[superscript +]?[superscript ?]?[superscript +]?[superscript ?] decay, where the muon pair does not originate from a resonance, is performed using proton–proton collision data corresponding ...

  7. Resonantly detecting axion-mediated forces with nuclear magnetic resonance.

    PubMed

    Arvanitaki, Asimina; Geraci, Andrew A

    2014-10-17

    We describe a method based on precision magnetometry that can extend the search for axion-mediated spin-dependent forces by several orders of magnitude. By combining techniques used in nuclear magnetic resonance and short-distance tests of gravity, our approach can substantially improve upon current experimental limits set by astrophysics, and probe deep into the theoretically interesting regime for the Peccei-Quinn (PQ) axion. Our method is sensitive to PQ axion decay constants between 10(9) and 10(12) GeV or axion masses between 10(-6) and 10(-3) eV, independent of the cosmic axion abundance. PMID:25361250

  8. Clumpy stellar winds and high-energy emission in high-mass binaries hosting a young pulsar

    NASA Astrophysics Data System (ADS)

    Bosch-Ramon, V.

    2013-12-01

    Context. High-mass binaries hosting young pulsars can be powerful gamma-ray emitters. The stellar wind of the massive star in the system, which interacts with the pulsar wind, is expected to be clumpy. Since the high-energy emission comes from the interaction of the two winds, the presence of clumps can affect the spectrum and variability of this radiation. Aims: We look for the main effects of the presence of clumps in the stellar wind in the two-wind interaction region and in the non-thermal radiation that originates there. Methods: A simple analytical model for the two-wind interaction dynamics was developed. The model accounts for the lifetime of clumps under the pulsar-wind impact. This time plays a very important role with regard to the evolution of the clump, the magnetic field in the clump-pulsar wind interaction region, and the non-radiative and radiative cooling of the non-thermal particles. We also computed the high-energy emission produced at the interaction of long-living clumps with the pulsar wind. Results: For reasonable parameters, the clumps will induce small variability on the X-ray and gamma-ray radiation. Sporadically, large clumps can reach closer to the pulsar increasing the magnetic field, triggering synchrotron X-ray flares and weakening other emission components like inverse Compton. The reduction of the emitter size induced by clumps also makes non-radiative losses faster. Stellar wind clumps can also enhance instability development and matter entrainment in the shocked pulsar wind when it leaves the binary. Growth limitations of the clumps from the wind acceleration region may imply that a different origin for the largest clumps is required. The large-scale wind structures behind the observed discrete absorption components in the ultraviolet may be the source of these large clumps. Conclusions: The presence of structure in the stellar wind can produce substantial energy-dependent variability and thus should not be neglected when studying the broadband emission from high-mass binaries hosting young pulsars.

  9. Search for CP Violation in D± Meson Decays to ??±

    DOE PAGESBeta

    Stari?, M.; Aihara, H.; Arinstein, K.; Asner, D. M.; Aushev, T.; Bakich, A. M.; Bay, A.; Bhardwaj, V.; Bhuyan, B.; Bozek, A.; Bra?ko, M.; Browder, T. E.; Chen, A.; Chen, P.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Cho, I.-S.; Cho, K.; Choi, Y.; Doležal, Z.; Drásal, Z.; Eidelman, S.; Fast, J. E.; Gaur, V.; Gabyshev, N.; Golob, B.; Haba, J.; Hayasaka, K.; Horii, Y.; Hoshi, Y.; Hou, W.-S.; Hsiung, Y. B.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwabuchi, M.; Iwasaki, Y.; Iwashita, T.; Julius, T.; Kang, J. H.; Kawasaki, T.; Kiesling, C.; Kim, H. J.; Kim, H. O.; Kim, J. B.; Kim, K. T.; Kim, M. J.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Kobayashi, N.; Koblitz, S.; Kodyš, P.; Korpar, S.; Križan, P.; Kumita, T.; Kwon, Y.-J.; Lange, J. S.; Lee, S.-H.; Li, J.; Li, Y.; Libby, J.; Liu, C.; Liu, Z. Q.; Louvot, R.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mohanty, G. B.; Nakano, E.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Nozaki, T.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Pakhlova, G.; Park, H. K.; Park, K. S.; Pestotnik, R.; Petri?, M.; Piilonen, L. E.; Röhrken, M.; Ryu, S.; Sahoo, H.; Sakai, K.; Sakai, Y.; Sanuki, T.; Schneider, O.; Schwanda, C.; Schwartz, A. J.; Seon, O.; Sevior, M. E.; Shebalin, V.; Shen, C. P.; Shibata, T.-A.; Shiu, J.-G.; Shwartz, B.; Simon, F.; Smerkol, P.; Sohn, Y.-S.; Sokolov, A.; Stani?, S.; Sumihama, M.; Sumisawa, K.; Tatishvili, G.; Teramoto, Y.; Trabelsi, K.; Uchida, M.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Varner, G.; Vossen, A.; Wang, C. H.; Wang, M.-Z.; Watanabe, M.; Watanabe, Y.; Williams, K. M.; Won, E.; Yabsley, B. D.; Yamashita, Y.; Yuan, C. Z.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

    2012-02-01

    We search for CP violation in Cabibbo-suppressed charged D meson decays by measuring the difference between the CP-violating asymmetries for the Cabibbo-suppressed decays D±?K?K??± and the Cabibbo-favored decays D±s?K?K??± in the K?K? mass region of the ? resonance. Using 955 fb?¹ of data collected with the Belle detector, we obtain AD?????CP=(+0.51±0.28±0.05)%. The measurement improves the sensitivity of previous searches by more than a factor of 5. We find no evidence for direct CP violation.

  10. Search for CP violation in D± meson decays to ??±.

    PubMed

    Stari?, M; Aihara, H; Arinstein, K; Asner, D M; Aushev, T; Bakich, A M; Bay, A; Bhardwaj, V; Bhuyan, B; Bozek, A; Bra?ko, M; Browder, T E; Chen, A; Chen, P; Cheon, B G; Chilikin, K; Chistov, R; Cho, I-S; Cho, K; Choi, Y; Doležal, Z; Drásal, Z; Eidelman, S; Fast, J E; Gaur, V; Gabyshev, N; Golob, B; Haba, J; Hayasaka, K; Horii, Y; Hoshi, Y; Hou, W-S; Hsiung, Y B; Iijima, T; Inami, K; Ishikawa, A; Itoh, R; Iwabuchi, M; Iwasaki, Y; Iwashita, T; Julius, T; Kang, J H; Kawasaki, T; Kiesling, C; Kim, H J; Kim, H O; Kim, J B; Kim, K T; Kim, M J; Kim, Y J; Kinoshita, K; Ko, B R; Kobayashi, N; Koblitz, S; Kodyš, P; Korpar, S; Križan, P; Kumita, T; Kwon, Y-J; Lange, J S; Lee, S-H; Li, J; Li, Y; Libby, J; Liu, C; Liu, Z Q; Louvot, R; McOnie, S; Miyabayashi, K; Miyata, H; Miyazaki, Y; Mohanty, G B; Nakano, E; Natkaniec, Z; Nishida, S; Nitoh, O; Nozaki, T; Ohshima, T; Okuno, S; Olsen, S L; Pakhlova, G; Park, H K; Park, K S; Pestotnik, R; Petri?, M; Piilonen, L E; Röhrken, M; Ryu, S; Sahoo, H; Sakai, K; Sakai, Y; Sanuki, T; Schneider, O; Schwanda, C; Schwartz, A J; Seon, O; Sevior, M E; Shebalin, V; Shen, C P; Shibata, T-A; Shiu, J-G; Shwartz, B; Simon, F; Smerkol, P; Sohn, Y-S; Sokolov, A; Stani?, S; Sumihama, M; Sumisawa, K; Tatishvili, G; Teramoto, Y; Trabelsi, K; Uchida, M; Uehara, S; Uglov, T; Unno, Y; Uno, S; Urquijo, P; Varner, G; Vossen, A; Wang, C H; Wang, M-Z; Watanabe, M; Watanabe, Y; Williams, K M; Won, E; Yabsley, B D; Yamashita, Y; Yuan, C Z; Zhang, C C; Zhang, Z P; Zhilich, V; Zhulanov, V; Zupanc, A

    2012-02-17

    We search for CP violation in Cabibbo-suppressed charged D meson decays by measuring the difference between the CP-violating asymmetries for the Cabibbo-suppressed decays D(±)?K(+)K(-)?(±) and the Cabibbo-favored decays D(s)(±)?K(+)K(-)?(±) in the K(+)K(-) mass region of the ? resonance. Using 955??fb(-1) of data collected with the Belle detector, we obtain A(CP)(D+???+)=(+0.51±0.28±0.05)%. The measurement improves the sensitivity of previous searches by more than a factor of 5. We find no evidence for direct CP violation. PMID:22401192

  11. Frequency scan for the analysis of high mass ions generated by matrix-assisted laser desorption/ionization in a paul trap

    PubMed

    Schlunegger; Stoeckli; Caprioli

    1999-01-01

    An ion trap has been modified for the analysis of high mass ions generated by matrix-assisted laser desorption/ionization. Samples are deposited on a probe tip and introduced directly onto the hyperbolically shaped surface of one endcap. All three electrodes - both the endcaps and the ring electrode - are insulated so that the radio frequency (Rf) voltage may be applied to the center ring electrode and the inverted Rf voltage to the endcaps. By using low frequencies (below 100 kHz) and low amplitudes (below 200 V), high mass singly charged ions may be trapped and analyzed by a frequency sweep at constant amplitude. In the high mass range (60-160 kDa), this instrument showed good sensitivity, signal-to-noise ratios, and mass resolution. Copyright 1999 John Wiley & Sons, Ltd. PMID:10482890

  12. Observation of $\\psp$ decays to $?(770)?$ and $?(2150)?$

    E-print Network

    BES Collaboration; M. Ablikim

    2004-08-13

    \\pspto \\rho\\pi is observed for the fisrt time in a data sample of 14M \\psp decays collected by the BESII detector at BEPC. The branching fraction is measured to be \\BR(pspto\\rho\\pi)=(5.1+-0.7+-0.8)10-5, where the first error is statistical and the second one is systematic. A high mass excited \\rho state wirh mass around 2.15GeV/c2 is also observed wirh \\BR(pspto \\rho(2150)\\pi) \\ra pi+pi-pi0) =(19.4+-2.5+11.2-2.1)10-5. The branching fraction of \\pspto pi+pi-pi0 is measued with improved precision, \\BR(\\pspto pi+pi-pi0)=(18.1+-1.8+-1.9)10-5. The results may shed light on the understanding of the longstanding "\\rhopi puzzle" between \\jpsi and \\psp hadronic decays.

  13. Higgs boson production and decay at e+e- colliders as a probe of the Left-Right twin Higgs model

    NASA Astrophysics Data System (ADS)

    Han, Jinzhong; Li, Shaofeng; Yang, Bingfang; Liu, Ning

    2015-07-01

    In the framework of the Left-Right twin Higgs (LRTH) model, we consider the constrains from the latest search for high-mass dilepton resonances at the LHC and find that the heavy neutral boson ZH is excluded with mass below 2.76 TeV. Under these constrains, we study the Higgs-Gauge coupling production processes e+e- ? ZH, e+e- ??e?e bar H and e+e- ?e+e- H, top quark Yukawa coupling production process e+e- ? t t bar H, Higgs self-couplings production processes e+e- ? ZHH and e+e- ??e?e bar HH at e+e- colliders. Besides, we study the major decay modes of the Higgs boson, namely h ? f f bar (f = b , c , ?), VV* (V = W , Z), gg, ??. We find that the LRTH effects are sizable so that the Higgs boson processes at e+e- collider can be a sensitive probe for the LRTH model.

  14. Vibrational Resonance in the Morse Oscillator

    E-print Network

    K. Abirami; S. Rajasekar; M. A. F. Sanjuan

    2013-04-15

    We investigate the occurrence of vibrational resonance in both classical and quantum mechanical Morse oscillators driven by a biharmonic force. The biharmonic force consists of two forces of widely different frequencies \\omega and \\Omega with \\Omega>>\\omega. In the damped and biharmonically driven classical Morse oscillator applying a theoretical approach we obtain an analytical expression for the response amplitude at the low-frequency \\omega. We identify the conditions on the parameters for the occurrence of the resonance. The system shows only one resonance and moreover at resonance the response amplitude is 1/(d\\omega) where d is the coefficient of linear damping. When the amplitude of the high-frequency force is varied after resonance the response amplitude does not decay to zero but approaches a nonzero limiting value. We have observed that vibrational resonance occurs when the sinusoidal force is replaced by a square-wave force. We also report the occurrence of resonance and anti-resonance of transition probability of quantum mechanical Morse oscillator in the presence of the biharmonic external field.

  15. If It's Resonance, What is Resonating?

    ERIC Educational Resources Information Center

    Kerber, Robert C.

    2006-01-01

    The phenomenon under the name "resonance," which, is based on the mathematical analogy between mechanical resonance and the behavior of wave functions in quantum mechanical exchange phenomena was described. The resonating system does not have a structure intermediate between those involved in the resonance, but instead a structure which is further…

  16. All-Resonant Control of Superconducting Resonators

    E-print Network

    Frederick W. Strauch

    2012-08-17

    An all-resonant method is proposed to control the quantum state of superconducting resonators. This approach uses a tunable artificial atom linearly coupled to resonators, and allows for efficient routes to Fock state synthesis, qudit logic operations, and synthesis of NOON states. This resonant approach is theoretically analyzed, and found to perform signficantly better than existing proposals using the same technology.

  17. LLC resonant converter with two resonant tanks

    Microsoft Academic Search

    Eun-Soo Kim; Joo-Hoon Kim; Kwang-Ho Lee; Yong-Seog Jeon; Jae-Sam Lee; Dong-Young Huh

    2010-01-01

    To cope with the high power density and low cost in switching power supply, LLC resonant converters with the two resonant tank circuits composed of resonance capacitors and two transformers are proposed in this paper. Each transformers used for the proposed resonant circuits are parallel connected in the primary and series connected in the secondary to reduce the current unbalance.

  18. Radiative Penguin decays at Belle

    E-print Network

    Jin Li

    2008-10-17

    We present recent progresses in radiative penguin decays of $B$ meson using a large sample of $B\\bar{B}$ pairs recorded at the $\\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. We report precise measurement of inclusive $b\\to s\\gamma$ branching ratio with cut $E_\\gamma > 1.7$ GeV, first measurement of time-dependent CP-violation in $B^0\\to K_s\\rho^0\\gamma$, measurement of $B^+\\to K^+\\eta'\\gamma$ branching fraction, and improved branching fraction results for $B^0\\to(\\rho,\\omega)\\gamma$ with new CP and isospin violation results in the mode.

  19. The wide band spectral observation of high mass x-ray binary 4u1700-37 with suzaku (II)

    NASA Astrophysics Data System (ADS)

    Koseki, Yuu; Sasaki, Chikako; Kokubun, Motohide

    4U1700-37 is a high mass X-ray binary discovered by Uhuru satellite, whose companion star HD153919 is the brightest one in the visible light. 4U1700-37 was observed with Suzaku from September 13th to 14th, 2006. The observational period corresponded to an orbital phase of 0.30-0.72, and the XIS mode was set to be 1/4 window mode with 1 sec Burst mode. We have divided all observation data into 1000 sec periods and individually fitted the extracted spectra by the cut off power-law model. Several results were obtained from light curves of the best-fit parameters. The normalization of power-law and line flux was fluctuating by a factor of 10, and the absorption was also making a variation such order. On the other hand, the power-law index approximately stayed in a range of 0.7-1.2, except a short period in which the value dropped smaller than 0. The cutoff and folding energy stayed comparatively flat, changing between 4 and 14 keV, 5 and 25 keV, respectively. The line center energy almost remained constant. We will report these results on the wide-band spectral properties and temporal behaviors of 4U1700-37.

  20. Chemical evolution of high-mass stars in close binaries. I. The eclipsing binary V453 Cygni

    E-print Network

    K. Pavlovski; J. Southworth

    2008-12-19

    The eclipsing and double-lined spectroscopic binary system V453 Cygni consists of two early B-type stars, one of which is nearing the terminal age main sequence and one which is roughly halfway through its main sequence lifetime. Accurate measurements of the masses and radii of the two stars are available, which makes a detailed abundance analysis both more interesting and more precise than for isolated stars. We have reconstructed the spectra of the individual components of V453 Cyg from the observed composite spectra using the technique of spectral disentangling. From these disentangled spectra we have obtained improved effective temperature measurements of 27900 +/- 400 K and 26200 +/- 500 K, for the primary and secondary stars respectively, by fitting non-LTE theoretical line profiles to the hydrogen Balmer lines. Armed with these high-precision effective temperatures and the accurately known surface gravities of the stars we have obtained the abundances of helium and metallic elements. A detailed abundance analysis of the primary star shows a normal (solar) helium abundance if the microturbulence velocity derived from metallic lines is used. The elemental abundances show no indication that CNO-processed material is present in the photosphere of this high-mass terminal age main sequence star. The elemental abundances of the secondary star were derived by differential study against a template spectrum of a star with similar characteristics. Both the primary and secondary components display elemental abundances which are in the ranges observed in the Galactic OB stars.

  1. The High-Mass End of the Black Hole Mass Function: Mass Estimates in Brightest Cluster Galaxies

    E-print Network

    E. Dalla Bonta'; L. Ferrarese; E. M. Corsini; J. Miralda-Escude'; L. Coccato; M. Sarzi; A. Pizzella; A. Beifiori

    2008-09-04

    We present Hubble Space Telescope imaging and spectroscopic observations of three Brightest Cluster Galaxies, Abell 1836-BCG, Abell 2052-BCG, and Abell 3565-BCG, obtained with the Wide Field and Planetary Camera 2, the Advanced Camera for Surveys and the Space Telescope Imaging Spectrograph. The data provide detailed information on the structure and mass profile of the stellar component, the dust optical depth, and the spatial distribution and kinematics of the ionized gas within the innermost region of each galaxy. Dynamical models, which account for the observed stellar mass profile and include the contribution of a central supermassive black hole (SBH), are constructed to reproduce the kinematics derived from the Halpha and [N II](lambda 6548,6583) emission lines. Secure SBH detection with M_bh=3.61(+0.41,-0.50)x10^9 M_sun and M_bh=1.34(+0.21,-0.19)x10^9 M_sun, respectively, are obtained for Abell 1836-BCG and Abell 3565-BCG, which show regular rotation curves and strong central velocity gradients. In the case of Abell 2052-BCG, the lack of an orderly rotational motion prevents a secure determination, although an upper limit of M_bh < 4.60x10^9 M_sun can be placed on the mass of the central SBH. These measurements represent an important step forward in the characterization of the high-mass end of the SBH mass function.

  2. Focused winds in high mass X-ray binaries: the case of Cyg X-1/HDE 226868

    NASA Astrophysics Data System (ADS)

    Grinberg, V.; Leutenegger, M.; Hell, N.; Pottschmidt, K.; B"ock, M.; García, J.; Nowak, M.; Sundqvist, J.; Townsend, R.; Wilms, J.

    2015-07-01

    As persistent sources, high mass X-ray binaries (HMXB) are ideal objects for observations aimed at deciphering properties of accretion and ejections flows. However, HMXBs are also strongly affected by the presence of strong, line-driven winds from the hot, massive companion stars. These winds drive the accretion towards the compact object, but also interact with both the radiation and the outflows produced in the inner regions, and have been suggested to majorly influence state transitions. The strongly variable absorption from the wind material has to be taken into account when analyzing HMXB observations. Here we use ˜ 5 Msec of RXTE observations of the HMXB Cygnus X-1 to constrain the orbital variability of the companion wind throughout different X-ray states. The variability can only be explained if we account for the presence of cold, dense clumps embedded in a tenuous hot gas. We put constraints on the porosity of such a two-component wind. We also show that even given the RXTE's limited coverage of the soft X-ray bandpass, we can only constrain the spectro-timing evolution of the source if we simultaneously account for the variable wind absorption.

  3. Orbital Phase Spectroscopy of four High Mass X-ray Binary Pulsars to Study the Stellar Wind of the Companion

    E-print Network

    Sachindra Naik; Uddipan Mukherjee; Biswajit Paul; C. S. Choi

    2008-12-24

    Our work focuses on a comprehensive orbital phase dependent spectroscopy of the four High Mass X-ray Binary Pulsars (HMXBPs) 4U 1538-52, GX 301-2, OAO 1657-415 & Vela X-1. We hereby report the measurements of the variation of the absorption column density and iron-line flux along with other spectral parameters over the binary orbit for the above-mentioned HMXBPs in elliptical orbits, as observed with the Rossi X-ray Timing Explorer (RXTE) and the BeppoSAX satellites. A spherically symmetric wind profile was used as a model to compare the observed column density variations. Out of the four pulsars, only in 4U 1538-52, we find the model having a reasonable corroboration with the observations, whereas in the remaining three the stellar wind seems to be clumpy and a smooth symmetric stellar wind model appears to be quite inadequate in explaining the data. Moreover, in GX 301-2, neither the presence of a disk nor a gas stream from the companion was validated. Furthermore, the spectral results obtained in the case of OAO 1657-415 & Vela X-1 were more or less similar to that of GX 301-2.

  4. High mass resolution time of flight mass spectrometer for measuring products in heterogeneous catalysis in highly sensitive microreactors

    SciTech Connect

    Andersen, T.; Jensen, R.; Christensen, M. K.; Chorkendorff, I. [Department of Physics, Danish National Research Foundation's Center for Individual Nanoparticle Functionality (CINF), Technical University of Denmark, Building 312, DK-2800 Kgs. Lyngby (Denmark); Pedersen, T.; Hansen, O. [Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech Building 345 East, DK-2800 Kgs. Lyngby (Denmark)

    2012-07-15

    We demonstrate a combined microreactor and time of flight system for testing and characterization of heterogeneous catalysts with high resolution mass spectrometry and high sensitivity. Catalyst testing is performed in silicon-based microreactors which have high sensitivity and fast thermal response. Gas analysis is performed with a time of flight mass spectrometer with a modified nude Bayard-Alpert ionization gauge as gas ionization source. The mass resolution of the time of flight mass spectrometer using the ion gauge as ionization source is estimated to m/{Delta}m > 2500. The system design is superior to conventional batch and flow reactors with accompanying product detection by quadrupole mass spectrometry or gas chromatography not only due to the high sensitivity, fast temperature response, high mass resolution, and fast acquisition time of mass spectra but it also allows wide mass range (0-5000 amu in the current configuration). As a demonstration of the system performance we present data from ammonia oxidation on a Pt thin film showing resolved spectra of OH and NH{sub 3}.

  5. Superorbital periodic modulation in wind-accretion high-mass X-ray binaries from swift burst alert telescope observations

    SciTech Connect

    Corbet, Robin H. D. [University of Maryland, Baltimore County, Baltimore, MD 21250 (United States); Krimm, Hans A., E-mail: corbet@umbc.edu [Universities Space Research Association, 10211 Wincopin Circle, Suite 500, Columbia, MD 21044 (United States)

    2013-11-20

    We report the discovery using data from the Swift-Burst Alert Telescope (BAT) of superorbital modulation in the wind-accretion supergiant high-mass X-ray binaries 4U 1909+07 (= X 1908+075), IGR J16418–4532, and IGR J16479–4514. Together with already known superorbital periodicities in 2S 0114+650 and IGR J16493–4348, the systems exhibit a monotonic relationship between superorbital and orbital periods. These systems include both supergiant fast X-ray transients and classical supergiant systems, and have a range of inclination angles. This suggests an underlying physical mechanism which is connected to the orbital period. In addition to these sources with clear detections of superorbital periods, IGR J16393–4643 (= AX J16390.4–4642) is identified as a system that may have superorbital modulation due to the coincidence of low-amplitude peaks in power spectra derived from BAT, Rossi X-Ray Timing Explorer Proportional Counter Array, and International Gamma-Ray Astrophysics Laboratory light curves. 1E 1145.1–6141 may also be worthy of further attention due to the amount of low-frequency modulation of its light curve. However, we find that the presence of superorbital modulation is not a universal feature of wind-accretion supergiant X-ray binaries.

  6. Quantification of tryptic peptides in quadrupole ion trap using high-mass signals derived from isotope-coded N-acetyl dipeptide tags.

    PubMed

    Seo, Jongcheol; Yoon, Hye-Joo; Shin, Seung Koo

    2011-09-01

    Isotope-labeled N-acetyl dipeptides (Ac-Xxx-Ala) are coupled to the primary amines of tryptic peptides and then analyzed by tandem mass spectrometry. Amide bond cleavage between Xxx and Ala provides both low- and high-mass isotope-coded signals for quantification of peptides. Especially, facile cleavage at the modified lysine side chain yields very strong high-mass quantitation signals in a noise-free region. Tagging tryptic peptides with isobaric N-acetyl dipeptides is a viable strategy for accurate quantification of proteins, which can be used with most quadrupole ion trap mass spectrometers carrying the 1/3 mass cut-off problem. PMID:21953270

  7. Parametric Decay during HHFW on NSTX

    SciTech Connect

    J.R. Wilson; S. Bernabei; T. Biewer; S. Diem; J. Hosea; B. LeBlanc; C.K. Phillips; P. Ryan; D.W. Swain

    2005-05-13

    High Harmonic Fast Wave (HHFW) heating experiments on NSTX have been observed to be accompanied by significant edge ion heating (T{sub i} >> T{sub e}). This heating is found to be anisotropic with T{sub perp} > T{sub par}. Simultaneously, coherent oscillations have been detected with an edge Langmuir probe. The oscillations are consistent with parametric decay of the incident fast wave ({omega} > 13{omega}{sub ci}) into ion Bernstein waves and an unobserved ion-cyclotron quasi-mode. The observation of anisotropic heating is consistent with Bernstein wave damping, and the Bernstein waves should completely damp in the plasma periphery as they propagate toward a cyclotron harmonic resonance. The number of daughter waves is found to increase with rf power, and to increase as the incident wave's toroidal wavelength increases. The frequencies of the daughter wave are separated by the edge ion cyclotron frequency. Theoretical calculations of the threshold for this decay in uniform plasma indicate an extremely small value of incident power should be required to drive the instability. While such decays are commonly observed at lower harmonics in conventional ICRF heating scenarios, they usually do not involve the loss of significant wave power from the pump wave. On NSTX an estimate of the power loss can be found by calculating the minimum power required to support the edge ion heating (presumed to come from the decay Bernstein wave). This calculation indicates at least 20-30% of the incident rf power ends up as decay waves.

  8. Search for rare B(0)((s))??(+)?(-)?(+)?(-) decays.

    PubMed

    Aaij, R; Abellan Beteta, C; Adametz, A; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves, A A; Amato, S; Amhis, Y; Anderlini, L; Anderson, J; Andreassen, R; Appleby, R B; Aquines Gutierrez, O; Archilli, F; Artamonov, A; Artuso, M; Aslanides, E; Auriemma, G; Bachmann, S; Back, J J; Baesso, C; Balagura, V; Baldini, W; Barlow, R J; Barschel, C; Barsuk, S; Barter, W; Bauer, Th; Bay, A; Beddow, J; Bediaga, I; Belogurov, S; Belous, K; Belyaev, I; Ben-Haim, E; Benayoun, M; Bencivenni, G; Benson, S; Benton, J; Berezhnoy, A; Bernet, R; Bettler, M-O; van Beuzekom, M; Bien, A; Bifani, S; Bird, T; Bizzeti, A; Bjørnstad, P M; Blake, T; Blanc, F; Blouw, J; Blusk, S; Bobrov, A; Bocci, V; Bondar, A; Bondar, N; Bonivento, W; Borghi, S; Borgia, A; Bowcock, T J V; Bowen, E; Bozzi, C; Brambach, T; van den Brand, J; Bressieux, J; Brett, D; Britsch, M; Britton, T; Brook, N H; Brown, H; Burducea, I; Bursche, A; Buytaert, J; Cadeddu, S; Callot, O; Calvi, M; Calvo Gomez, M; Camboni, A; Campana, P; Carbone, A; Carboni, G; Cardinale, R; Cardini, A; Carranza-Mejia, H; Carson, L; Carvalho Akiba, K; Casse, G; Cattaneo, M; Cauet, Ch; Charles, M; Charpentier, Ph; Chen, P; Chiapolini, N; Chrzaszcz, M; Ciba, K; Cid Vidal, X; Ciezarek, G; Clarke, P E L; Clemencic, M; Cliff, H V; Closier, J; Coca, C; Coco, V; Cogan, J; Cogneras, E; Collins, P; Comerma-Montells, A; Contu, A; Cook, A; Coombes, M; Coquereau, S; Corti, G; Couturier, B; Cowan, G A; Craik, D; Cunliffe, S; Currie, R; D'Ambrosio, C; David, P; David, P N Y; De Bonis, I; De Bruyn, K; De Capua, S; De Cian, M; De Miranda, J M; De Paula, L; De Silva, W; De Simone, P; Decamp, D; Deckenhoff, M; Degaudenzi, H; Del Buono, L; Deplano, C; Derkach, D; Deschamps, O; Dettori, F; Di Canto, A; Dickens, J; Dijkstra, H; Dogaru, M; Domingo Bonal, F; Donleavy, S; Dordei, F; Dosil Suárez, A; Dossett, D; Dovbnya, A; Dupertuis, F; Dzhelyadin, R; Dziurda, A; Dzyuba, A; Easo, S; Egede, U; Egorychev, V; Eidelman, S; van Eijk, D; Eisenhardt, S; Eitschberger, U; Ekelhof, R; Eklund, L; El Rifai, I; Elsasser, Ch; Elsby, D; Falabella, A; Färber, C; Fardell, G; Farinelli, C; Farry, S; Fave, V; Ferguson, D; Fernandez Albor, V; Ferreira Rodrigues, F; Ferro-Luzzi, M; Filippov, S; Fitzpatrick, C; Fontana, M; Fontanelli, F; Forty, R; Francisco, O; Frank, M; Frei, C; Frosini, M; Furcas, S; Furfaro, E; Gallas Torreira, A; Galli, D; Gandelman, M; Gandini, P; Gao, Y; Garofoli, J; Garosi, P; Garra Tico, J; Garrido, L; Gaspar, C; Gauld, R; Gersabeck, E; Gersabeck, M; Gershon, T; Ghez, Ph; Gibson, V; Gligorov, V V; Göbel, C; Golubkov, D; Golutvin, A; Gomes, A; Gordon, H; Grabalosa Gándara, M; Graciani Diaz, R; Granado Cardoso, L A; Graugés, E; Graziani, G; Grecu, A; Greening, E; Gregson, S; Grünberg, O; Gui, B; Gushchin, E; Guz, Yu; Gys, T; Hadjivasiliou, C; Haefeli, G; Haen, C; Haines, S C; Hall, S; Hampson, T; Hansmann-Menzemer, S; Harnew, N; Harnew, S T; Harrison, J; Harrison, P F; Hartmann, T; He, J; Heijne, V; Hennessy, K; Henrard, P; Hernando Morata, J A; van Herwijnen, E; Hicks, E; Hill, D; Hoballah, M; Hombach, C; Hopchev, P; Hulsbergen, W; Hunt, P; Huse, T; Hussain, N; Hutchcroft, D; Hynds, D; Iakovenko, V; Idzik, M; Ilten, P; Jacobsson, R; Jaeger, A; Jans, E; Jaton, P; Jing, F; John, M; Johnson, D; Jones, C R; Jost, B; Kaballo, M; Kandybei, S; Karacson, M; Karbach, T M; Kenyon, I R; Kerzel, U; Ketel, T; Keune, A; Khanji, B; Kochebina, O; Komarov, I; Koopman, R F; Koppenburg, P; Korolev, M; Kozlinskiy, A; Kravchuk, L; Kreplin, K; Kreps, M; Krocker, G; Krokovny, P; Kruse, F; Kucharczyk, M; Kudryavtsev, V; Kvaratskheliya, T; La Thi, V N; Lacarrere, D; Lafferty, G; Lai, A; Lambert, D; Lambert, R W; Lanciotti, E; Lanfranchi, G; Langenbruch, C; Latham, T; Lazzeroni, C; Le Gac, R; van Leerdam, J; Lees, J-P; Lefèvre, R; Leflat, A; Lefrançois, J; Leroy, O; Li, Y; Li Gioi, L; Liles, M; Lindner, R; Linn, C; Liu, B; Liu, G; von Loeben, J; Lohn, S; Lopes, J H; Lopez Asamar, E; Lopez-March, N; Lu, H; Luisier, J; Luo, H; Machefert, F; Machikhiliyan, I V; Maciuc, F; Maev, O; Malde, S; Manca, G; Mancinelli, G; Mangiafave, N; Marconi, U; Märki, R; Marks, J; Martellotti, G; Martens, A; Martin, L; Martín Sánchez, A; Martinelli, M; Martinez Santos, D; Martins Tostes, D; Massafferri, A; Matev, R; Mathe, Z; Matteuzzi, C; Matveev, M; Maurice, E; Mazurov, A; McCarthy, J; McNulty, R; Meadows, B; Meier, F; Meissner, M; Merk, M; Milanes, D A; Minard, M-N; Molina Rodriguez, J; Monteil, S; Moran, D; Morawski, P; Mountain, R; Mous, I; Muheim, F; Müller, K; Muresan, R; Muryn, B; Muster, B; Naik, P; Nakada, T; Nandakumar, R; Nasteva, I; Needham, M; Neufeld, N; Nguyen, A D; Nguyen, T D; Nguyen-Mau, C; Nicol, M; Niess, V; Niet, R; Nikitin, N; Nikodem, T; Nisar, S; Nomerotski, A; Novoselov, A

    2013-05-24

    A search for the decays B(0)((s))??(+)?(-)?(+)?(-) and B(0)??(+)?(-)?(+)?(-) is performed using data, corresponding to an integrated luminosity of 1.0 fb(-1), collected with the LHCb detector in 2011. The number of candidates observed is consistent with the expected background and, assuming phase-space models of the decays, limits on the branching fractions are set: B(B(s)(0)??(+)?(-)?(+)?(-))<1.6(1.2)×10(-8) and B(B(0)??(+)?(-)?(+)?(-))<6.6(5.3)×10(-9) at 95% (90%) confidence level. In addition, limits are set in the context of a supersymmetric model which allows for the B((s))(0) meson to decay into a scalar (S) and pseudoscalar particle (P), where S and P have masses of 2.5 GeV/c and 214.3 MeV/c, respectively, both resonances decay into ?(+)?(-). The branching fraction limits for these decays are B(B(s)(0)?SP)<1.6(1.2)×10(-8) and B(B(0)?SP)<6.3(5.1)×10(-9) at 95% (90%) confidence level. PMID:23745860

  9. Decays of J/psi (3100) to baryon final states

    SciTech Connect

    Eaton, M.W.

    1982-05-01

    We present results for the decays of psi(3100) into baryon and hyperon final states. The sample studied here consists of 1.3 million produced psi decays. The decays into nonstrange baryons agree well with currently established results, but with better statistics. In addition, significant resonance formation in multibody final states is observed. The decay psi ..-->.. anti pp..gamma.., the first direct photon decay of the psi involving baryons in the final state, is presented and the theoretical implications of the decays are briefly explored. Several new decays of the psi involving strange baryons are explored, including the first observations of three body final states involving hyperons. The I-spin symmetry of the strong decay psi ..-->.. baryons has clearly been observed. The reduced matrix elements for psi ..-->.. B anti B are presented for final states of different SU(3) content. The B/sub 8/ anti B/sub 8/ results are in excellent agreement with the psi being an SU(3) singlet as are the results for psi ..-->.. B/sub 10/ anti B/sub 10/. We present the first evidence for the SU(3) violating decays of the type psi ..-->.. B/sub 8/ anti B/sub 10/ + c.c.. Angular distributions for psi ..-->.. B/sub 8/ anti B/sub 8/ are presented and compared with theoretical predictions. Statistics are limited, but the data tends to prefer other than a 1 + Cos/sup 2/theta distribution.

  10. Electroweak-scale resonant leptogenesis

    SciTech Connect

    Pilaftsis, Apostolos; Underwood, Thomas E.J. [School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)

    2005-12-01

    We study minimal scenarios of resonant leptogenesis near the electroweak phase transition. These models offer a number of testable phenomenological signatures for low-energy experiments and future high-energy colliders. Our study extends previous analyses of the relevant network of Boltzmann equations, consistently taking into account effects from out of equilibrium sphalerons and single lepton flavors. We show that the effects from single lepton flavors become very important in variants of resonant leptogenesis, where the observed baryon asymmetry in the Universe is created by lepton-to-baryon conversion of an individual lepton number, for example, that of the {tau}-lepton. The predictions of such resonant {tau}-leptogenesis models for the final baryon asymmetry are almost independent of the initial lepton-number and heavy neutrino abundances. These models accommodate the current neutrino data and have a number of testable phenomenological implications. They contain electroweak-scale heavy Majorana neutrinos with appreciable couplings to electrons and muons, which can be probed at future e{sup +}e{sup -} and {mu}{sup +}{mu}{sup -} high-energy colliders. In particular, resonant {tau}-leptogenesis models predict sizable 0{nu}{beta}{beta} decay, as well as e- and {mu}-number-violating processes, such as {mu}{yields}e{gamma} and {mu}{yields}e conversion in nuclei, with rates that are within reach of the experiments proposed by the MEG and MECO collaborations.

  11. Large Hadron Collider Probe of Supersymmetric Neutrinoless Double-Beta-Decay Mechanism

    Microsoft Academic Search

    B. C. Allanach; C. H. Kom; H. Päs

    2009-01-01

    In the minimal supersymmetric extension to the standard model, a nonzero lepton number violating coupling lambda111' predicts both neutrinoless double-beta-decay and resonant single slepton production at the LHC. We show that, in this case, if neutrinoless double beta decay is discovered in the next generation of experiments, there exist good prospects to observe single slepton production at the LHC. Neutrinoless

  12. Large Hadron Collider Probe of Supersymmetric Neutrinoless Double-Beta-Decay Mechanism

    Microsoft Academic Search

    H. Paes; C. H. Kom; B. C. Allanach

    2009-01-01

    In the minimal supersymmetric extension to the standard model, a nonzero lepton number violating coupling {sup '} predicts both neutrinoless double-beta-decay and resonant single slepton production at the LHC. We show that, in this case, if neutrinoless double beta decay is discovered in the next generation of experiments, there exist good prospects to observe single slepton production at the LHC.

  13. Measurement of inclusive production of neutral pions from Upsilon(4S) decays

    Microsoft Academic Search

    K. Abe; I. Adachi; Byoung Sup Ahn; H. Aihara; M. Akatsu; G. Alimonti; K. Aoki; K. Asai; Y. Asano; T. Aso; V. Aulchenko; T. Aushev; A. M. Bakich; E. Banas; W. Bartel; S. Behari; P. K. Behera; D. Beiline; A. Bondar; A. Bozek; T. E. Browder; B. C. Casey; P. Chang; Y. Chao; B. G. Cheon; S.-K. Choi; Y. Choi; Y. Doi; J. Dragic; A. Drutskoy; S. Eidelman; Y. Enari; R. Enomoto; F. Fang; H. Fujii; C. Fukunaga; M. Fukushima; A. Garmash; A. Gordon; K. Gotow; H. Guler; R. Guo; J. Haba; H. Hamasaki; K. Hanagaki; F. Handa; K. Hara; T. Hara; T. Haruyama; N. C. Hastings; K. Hayashi; H. Hayashii; M. Hazumi; E. M. Heenan; Y. Higasino; I. Higuchi; T. Higuchi; H. Hirano; T. Hojo; Y. Hoshi; W.-S. Hou; S.-C. Hsu; H.-C. Huang; Y.-C. Huang; S. Ichizawa; Y. Igarashi; T. Iijima; H. Ikeda; K. Ikeda; K. Inami; A. Ishikawa; H. Ishino; R. Itoh; G. Iwai; H. Iwasaki; Y. Iwasaki; D. J. Jackson; P. Jalocha; H. K. Jang; M. Jones; R. Kagan; H. Kakuno; J. Kaneko; J. H. Kang; J. S. Kang; P. Kapusta; N. Katayama; H. Kawai; N. Kawamura; T. Kawasaki; K. Kichimi; D. W. Kim; Heejong Kim; H. J. Kim; Hyunwoo Kim; S. K. Kim; K. Kinoshita; K. Korotushenko; P. Krokovny; R. Kulasiri; S. Kumar; T. Kuniya; E. Kurihara; A. Kuzmin; Y.-J. Kwon; J. S. Lange; M. H. Lee; S. H. Lee; H. B. Li; D. Liventsev; R.-S. Lu; A. Manabe; T. Matsubara; S. Matsui; S. Matsumoto; T. Matsumoto; Y. Mikami; K. Misono; K. Miyabayashi; H. Miyake; H. Miyata; L. C. Moffitt; G. R. Moloney; G. F. Moorhead; S. Mori; A. Murakami; T. Nagamine; Y. Nagasaka; Y. Nagashima; T. Nakadaira; E. Nakano; M. Nakao; J. W. Nam; S. Narita; Z. Natkaniec; K. Neichi; S. Nishida; O. Nitoh; S. Noguchi; T. Nozaki; S. Ogawa; T. Ohshima; Y. Ohshima; T. Okabe; T. Okazaki; S. Okuno; S. L. Olsen; W. Ostrowicz; H. Ozaki; H. Palka; C. S. Park; C. W. Park; L. S. Peak; M. Peters; L. E. Piilonen; E. Prebys; J. L. Rodriguez; N. Root; M. Rozanska; K. Rybicki; J. Ryuko; H. Sagawa; Y. Sakai; H. Sakamoto; M. Satapathy; A. Satpathy; S. Schrenk; S. Semenov; K. Senyo; M. E. Sevior; H. Shibuya; B. Shwartz; V. Sidorov; J. B. Singh; S. Stanic; A. Sugi; A. Sugiyama; K. Sumisawa; T. Sumiyoshi; K. Suzuki; S. Suzuki; S. K. Swain; T. Takahashi; F. Takasaki; M. Takita; K. Tamai; N. Tamura; J. Tanaka; M. Tanaka; Y. Tanaka; G. N. Taylor; Y. Teramoto; M. Tomoto; T. Tomura; S. N. Tovey; K. Trabelsi; T. Tsuboyama; Y. Tsujita; T. Tsukamoto; S. Uehara; K. Ueno; Y. Unno; S. Uno; Y. Ushiroda; Y. Usov; S. E. Vahsen; G. Varner; K. E. Varvell; C. C. Wang; M.-Z. Wang; T. J. Wang; Y. Watanabe; E. Won; B. D. Yabsley; Y. Yamada; M. Yamaga; A. Yamaguchi; H. Yamamoto; H. Yamaoka; Y. Yamaoka; Y. Yamashita; M. Yamauchi; S. Yanaka; K. Yoshida; Y. Yusa; H. Yuta; C. C. Zhang; J. Zhang; Y. Zheng; V. Zhilich; D. Zontar

    2001-01-01

    Using the Belle detector operating at the KEKB e+e- storage ring, we have measured the mean multiplicity and momentum spectrum of neutral pions from the decays of the Upsilon(4S) resonance. We measure a mean of 4.70+\\/-0.04+\\/-0.22 neutral pions per Upsilon(4S) decay.

  14. Alpha-Decay Half-Lives of Superheavy Nuclei

    SciTech Connect

    Budaca, A. I.; Silisteanu, I.; Silisteanu, A. O.; Anghel, C. I. [Horia Hulubei Institute of Physics and Nuclear Engineering RO-077125, Bucharest-Magurele (Romania)

    2010-11-24

    Half-lives given by self-consistent models for the {alpha}-clustering and resonance scattering are calculated and compared with data and empirical estimates. The major influence of the pairing, deformed shell closures and screening corrections is evidenced in the systematics of half-lives and provides a convenient basis for the interpretation of observed trends of the data and for prediction of new results. The very small widths of {alpha}-resonances observed experimentally in fusion-evaporation reactions, are interpreted as resonance levels of radioactive products, and such a correlation contributes directly to the study of the nuclear structure on the basis of decay data.

  15. Study of charged hadronic five-body decays of the D+ and D+s mesons

    NASA Astrophysics Data System (ADS)

    Frabetti, P. L.; Cheung, H. W. K.; Cumalat, J. P.; Dallapiccola, C.; Ginkel, J. F.; Johns, W. E.; Nehring, M. S.; Butler, J. N.; Cihangir, S.; Gaines, I.; Garbincius, P. H.; Garren, L.; Gourlay, S. A.; Harding, D. J.; Kasper, P.; Kreymer, A.; Lebrun, P.; Shukla, S.; Vittone, M.; Bianco, S.; Fabbri, F. L.; Sarwar, S.; Zallo, A.; Culbertson, R.; Gardner, R. W.; Greene, R.; Wiss, J.; Alimonti, G.; Bellini, G.; Boschini, M.; Brambilla, D.; Caccianiga, B.; Cinquini, L.; di Corato, M.; Giammarchi, M.; Gullotta, M.; Inzani, P.; Leveraro, F.; Malvezzi, S.; Menasce, D.; Meroni, E.; Moroni, L.; Pedrini, D.; Perasso, L.; Prelz, F.; Sala, A.; Sala, S.; Torretta, D.; Buchholz, D.; Claes, D.; Gobbi, B.; O'Reilly, B.; Bishop, J. M.; Cason, N. M.; Kennedy, C. J.; Kim, G. N.; Lin, T. F.; Puseljic, D. L.; Ruchti, R. C.; Shephard, W. D.; Swiatek, J. A.; Wu, Z. Y.; Arena, V.; Boca, G.; Castoldi, C.; Gianini, G.; Ratti, S. P.; Riccardi, C.; Viola, L.; Vitulo, P.; Lopeze, A.; Grim, G. P.; Paolone, V. S.; Yager, P. M.; Wilson, J. R.; Sheldon, P. D.; Davenport, F.; Danyo, K.; Handler, T.; Cheon, B. G.; Kang, J. S.; Kim, K. Y.

    1997-02-01

    Charged hadronic five-body decays of D+ and D+s mesons have been studied in the E687 photoproduction experiment at Fermilab. We report the first compelling evidence of the decay mode D+, D+s -> ?-?-?+?+?+ and the measurements of the decays D+ -> K-?-?+?+?+,D+s -> K-K+?-?+?+ andD+s -> ø?-?+?+. An analysis of the D+ ->K- ?-?+?+?+ resonance structure is also presented.

  16. Strong and electromagnetic decays of the light scalar mesons interpreted as tetraquark states

    Microsoft Academic Search

    Francesco Giacosa; Johann Wolfgang Goethe

    2006-01-01

    The study of two-pseudoscalar and two-photon decays for the scalar meson nonet below 1 GeV is performed within an effective approach in which the scalar resonances are described as (Jaffe's) tetraquark states. The dominant (fall apart decay) and the subdominant (one transverse gluon as intermediate state) decay amplitudes are systematically taken into account. The latter improves the agreement with the

  17. Measurement of Branching Fractions and Polarization in B>phiK(*) Decays

    Microsoft Academic Search

    K.-F. Chen; A. Bozek; K. Abe; T. Abe; I. Adachi; H. Aihara; M. Akatsu; Y. Asano; T. Aso; A. M. Bakich; Y. Ban; E. Banas; A. Bay; P. K. Behera; I. Bizjak; A. Bondar; M. Bracko; J. Brodzicka; T. E. Browder; B. C. Casey; M.-C. Chang; P. Chang; Y. Chao; B. G. Cheon; R. Chistov; S.-K. Choi; Y. Choi; M. Danilov; M. Dash; L. Y. Dong; A. Drutskoy; S. Eidelman; V. Eiges; Y. Enari; C. Fukunaga; N. Gabyshev; A. Garmash; T. Gershon; B. Golob; R. Guo; J. Haba; C. Hagner; F. Handa; H. Hayashii; M. Hazumi; T. Higuchi; L. Hinz; T. Hokuue; Y. B. Hsiung; W.-S. Hou; H.-C. Huang; Y. Igarashi; T. Iijima; K. Inami; A. Ishikawa; H. Ishino; R. Itoh; H. Iwasaki; Y. Iwasaki; H. K. Jang; M. Jones; J. H. Kang; J. S. Kang; N. Katayama; H. Kichimi; H. Kawai; T. Kawasaki; D. W. Kim; Hyunwoo Kim; J. H. Kim; S. K. Kim; K. Kinoshita; P. Koppenburg; S. Korpar; P. Krokovny; A. Kuzmin; Y.-J. Kwon; J. S. Lange; S. H. Lee; T. Lesiak; J. Li; A. Limosani; S.-W. Lin; J. MacNaughton; F. Mandl; D. Marlow; H. Matsumoto; T. Matsumoto; A. Matyja; W. Mitaroff; H. Miyake; H. Miyata; D. Mohapatra; T. Mori; T. Nagamine; T. Nakadaira; E. Nakano; M. Nakao; J. W. Nam; Z. Natkaniec; S. Nishida; O. Nitoh; T. Nozaki; S. Ogawa; T. Ohshima; T. Okabe; S. Okuno; S. L. Olsen; W. Ostrowicz; H. Ozaki; H. Palka; C. W. Park; K. S. Park; N. Parslow; L. S. Peak; M. Peters; L. E. Piilonen; N. Root; M. Rozanska; H. Sagawa; S. Saitoh; Y. Sakai; T. R. Sarangi; M. Satapathy; A. Satpathy; O. Schneider; J. Schümann; A. J. Schwartz; S. Semenov; K. Senyo; M. E. Sevior; V. Sidorov; J. B. Singh; S. Stanic; M. Staric; A. Sugi; K. Sumisawa; T. Sumiyoshi; S. Suzuki; T. Takahashi; F. Takasaki; K. Tamai; N. Tamura; M. Tanaka; Y. Teramoto; T. Tomura; T. Tsuboyama; T. Tsukamoto; K. Ueno; Y. Unno; S. Uno; Y. Ushiroda; G. Varner; K. E. Varvell; C. C. Wang; J. G. Wang; M.-Z. Wang; M. Watanabe; Y. Watanabe; E. Won; B. D. Yabsley; Y. Yamada; A. Yamaguchi; Y. Yamashita; M. Yamauchi; H. Yanai; P. Yeh; M. Yokoyama; Y. Yusa; C. C. Zhang; J. Zhang; Z. P. Zhang; Y. Zheng; V. Zhilich; D. Zontar

    2003-01-01

    We present the first measurement of decay amplitudes in B-->phiK* and measurements of branching fractions in B-->phiK(*) decays based on 78.1 fb-1 of data recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- storage ring. The decay amplitudes for the different phiK*0 helicity states are measured from the angular distributions of final state particles in the

  18. Resonance Rings

    NSDL National Science Digital Library

    This is an activity about resonance and where it is found in related to astronomy. Learners will construct two differently sized rings out of file folder paper and tape them to a piece of cardboard. Next, they will shake the cardboard from side to side, which shakes the rings, and observe what happens when the frequency of the shaking is gradually increased. This activity is from the Stanford Solar Center's All About the Sun: Sun and Stars activity guide for Grades 5-8 and can also accompany the Stanford Solar Center's Build Your Own Spectroscope activity.

  19. Search for New Physics Using High-Mass Tau Pairs from 1.96 TeV pp¯ Collisions

    Microsoft Academic Search

    D. Acosta; J. Adelman; T. Affolder; T. Akimoto; M. G. Albrow; D. Ambrose; S. Amerio; D. Amidei; A. Anastassov; K. Anikeev; A. Annovi; J. Antos; M. Aoki; G. Apollinari; T. Arisawa; J.-F. Arguin; A. Artikov; W. Ashmanskas; A. Attal; F. Azfar; P. Azzi-Bacchetta; N. Bacchetta; H. Bachacou; W. Badgett; A. Barbaro-Galtieri; G. J. Barker; V. E. Barnes; B. A. Barnett; S. Baroiant; G. Bauer; F. Bedeschi; S. Behari; S. Belforte; G. Bellettini; J. Bellinger; A. Belloni; E. Ben-Haim; D. Benjamin; A. Beretvas; T. Berry; A. Bhatti; M. Binkley; D. Bisello; M. Bishai; R. E. Blair; C. Blocker; K. Bloom; B. Blumenfeld; A. Bocci; A. Bodek; G. Bolla; A. Bolshov; D. Bortoletto; J. Boudreau; S. Bourov; B. Brau; C. Bromberg; E. Brubaker; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; K. L. Byrum; S. Cabrera; M. Campanelli; M. Campbell; F. Canelli; A. Canepa; M. Casarsa; D. Carlsmith; R. Carosi; S. Carron; M. Cavalli-Sforza; A. Castro; P. Catastini; D. Cauz; A. Cerri; L. Cerrito; J. Chapman; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; F. Chlebana; I. Cho; K. Cho; D. Chokheli; J. P. Chou; S. Chuang; K. Chung; W.-H. Chung; Y. S. Chung; M. Cijliak; C. I. Ciobanu; M. A. Ciocci; A. G. Clark; D. Clark; M. Coca; A. Connolly; M. Convery; J. Conway; B. Cooper; K. Copic; M. Cordelli; G. Cortiana; J. Cranshaw; J. Cuevas; A. Cruz; R. Culbertson; C. Currat; D. Cyr; D. Dagenhart; S. da Ronco; S. D'Auria; P. de Barbaro; S. de Cecco; A. Deisher; G. de Lentdecker; M. Dell'Orso; S. Demers; L. Demortier; M. Deninno; D. de Pedis; P. F. Derwent; T. Devlin; C. Dionisi; J. R. Dittmann; P. Dituro; C. Dörr; A. Dominguez; S. Donati; M. Donega; J. Donini; M. D'Onofrio; T. Dorigo; K. Ebina; J. Efron; J. Ehlers; R. Erbacher; M. Erdmann; D. Errede; S. Errede; R. Eusebi; H.-C. Fang; S. Farrington; I. Fedorko; W. T. Fedorko; R. G. Feild; M. Feindt; J. P. Fernandez; R. D. Field; G. Flanagan; L. R. Flores-Castillo; A. Foland; S. Forrester; G. W. Foster; M. Franklin; J. C. Freeman; Y. Fujii; I. Furic; A. Gajjar; M. Gallinaro; J. Galyardt; M. Garcia-Sciveres; A. F. Garfinkel; C. Gay; H. Gerberich; D. W. Gerdes; E. Gerchtein; S. Giagu; P. Giannetti; A. Gibson; K. Gibson; C. Ginsburg; K. Giolo; M. Giordani; M. Giunta; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; N. Goldschmidt; D. Goldstein; J. Goldstein; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. González; I. Gorelov; A. T. Goshaw; Y. Gotra; K. Goulianos; A. Gresele; M. Griffiths; C. Grosso-Pilcher; U. Grundler; J. Guimaraes da Costa; C. Haber; K. Hahn; S. R. Hahn; E. Halkiadakis; B.-Y. Han; R. Handler; F. Happacher; K. Hara; M. Hare; R. F. Harr; R. M. Harris; F. Hartmann; K. Hatakeyama; J. Hauser; C. Hays; H. Hayward; B. Heinemann; J. Heinrich; M. Hennecke; M. Herndon; C. Hill; D. Hirschbuehl; A. Hocker; K. D. Hoffman; A. Holloway; S. Hou; M. A. Houlden; B. T. Huffman; Y. Huang; R. E. Hughes; J. Huston; K. Ikado; J. Incandela; G. Introzzi; M. Iori; Y. Ishizawa; C. Issever; A. Ivanov; Y. Iwata; B. Iyutin; E. James; D. Jang; B. Jayatilaka; D. Jeans; H. Jensen; E. J. Jeon; M. Jones; K. K. Joo; S. Y. Jun; T. Junk; T. Kamon; J. Kang; M. Karagoz Unel; P. E. Karchin; Y. Kato; Y. Kemp; R. Kephart; U. Kerzel; V. Khotilovich; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; M. Kirby; L. Kirsch; S. Klimenko; M. Klute; B. Knuteson; B. R. Ko; H. Kobayashi; D. J. Kong; K. Kondo; J. Konigsberg; K. Kordas; A. Korn; A. Korytov; A. V. Kotwal; A. Kovalev; J. Kraus; I. Kravchenko; A. Kreymer; J. Kroll; M. Kruse; V. Krutelyov; S. E. Kuhlmann; S. Kwang; A. T. Laasanen; S. Lai; S. Lami; S. Lammel; M. Lancaster; R. Lander; K. Lannon; A. Lath; G. Latino; I. Lazzizzera; C. Lecci; T. Lecompte; J. Lee; S. W. Lee; R. Lefèvre; N. Leonardo; S. Leone; S. Levy; J. D. Lewis; K. Li; C. Lin; M. Lindgren; E. Lipeles; T. M. Liss; A. Lister; D. O. Litvintsev; T. Liu; Y. Liu; N. S. Lockyer; A. Loginov; M. Loreti; P. Loverre; R.-S. Lu; D. Lucchesi; P. Lujan; P. Lukens; G. Lungu; L. Lyons; J. Lys; R. Lysak; E. Lytken; D. MacQueen; R. Madrak; K. Maeshima; P. Maksimovic; G. Manca; F. Margaroli; R. Marginean; C. Marino; A. Martin; M. Martin; V. Martin; M. Martínez; T. Maruyama; H. Matsunaga; M. Mattson; P. Mazzanti; K. S. McFarland; D. McGivern; P. M. McIntyre; P. McNamara; R. McNulty; A. Mehta; S. Menzemer; A. Menzione; P. Merkel; C. Mesropian; A. Messina; T. Miao; N. Miladinovic; J. Miles; L. Miller; R. Miller; J. S. Miller; C. Mills; R. Miquel; S. Miscetti; G. Mitselmakher; A. Miyamoto; N. Moggi; B. Mohr; R. Moore; M. Morello; P. A. Movilla Fernandez; J. Muelmenstaedt; A. Mukherjee; M. Mulhearn; T. Muller; R. Mumford; A. Munar; P. Murat; J. Nachtman; S. Nahn; I. Nakano; A. Napier; R. Napora; D. Naumov; V. Necula; J. Nielsen; T. Nelson; C. Neu; M. S. Neubauer; T. Nigmanov; L. Nodulman; O. Norniella; T. Ogawa; S. H. Oh; Y. D. Oh; T. Ohsugi; T. Okusawa; R. Oldeman; R. Orava

    2005-01-01

    We present the results of a search for anomalous resonant production of tau lepton pairs with large invariant mass, the first such search using the CDF II Detector in Run II of the Tevatron p pmacr collider. Such anomalous production could arise from various new physics processes. In a data sample corresponding to 195pb-1 of integrated luminosity we predict 2.8±0.5

  20. Uniform-Penalty Inversion of Multiexponential Decay Data

    Microsoft Academic Search

    G. C. Borgia; R. J. S. Brown; P. Fantazzinit

    2000-01-01

    The basic method of UPEN (uniform penalty inversion of multiexponential decay data) is given in an earlier publication (Borgia et al., J. Magn. Reson. 132, 65–77 (1998)), which also discusses the effects of noise, constraints, and smoothing on the resolution or apparent resolution of features of a computed distribution of relaxation times. UPEN applies negative feedback to a regularization penalty,

  1. Coulomb corrections to superallowed beta decay in nuclei

    E-print Network

    N. Auerbach

    2008-11-28

    Corrections to the superallowed beta decay matrix elements are evaluated in perturbation theory using the notion of the isovector monopole resonance. The calculation avoids the separation into different contributions and thus presents a consistent, systematic and more transparent approach. Explicit expressions for the Coulomb correction as a function of mass number A, are given.

  2. Uniform-Penalty Inversion of Multiexponential Decay Data

    Microsoft Academic Search

    G. C. Borgia; R. J. S. Brown; P. Fantazzini

    2000-01-01

    The basic method of UPEN (uniform penalty inversion of multiexponential decay data) is given in an earlier publication (Borgia et al., J. Magn. Reson. 132, 65-77 (1998)), which also discusses the effects of noise, constraints, and smoothing on the resolution or apparent resolution of features of a computed distribution of relaxation times. UPEN applies negative feedback to a regularization penalty,

  3. Measurement of Semileptonic B Decays into Orbitally Excited Charmed Mesons

    E-print Network

    Zhao, M.

    We present a study of B decays into semileptonic final states containing charged and neutral D1(2420) and D2*(2460). The analysis is based on a data sample of 208??fb-1 collected at the ?(4S) resonance with the BABAR ...

  4. Linear electric field mass analysis: a technique for three-dimensional high mass resolution space plasma composition measurements.

    PubMed Central

    McComas, D J; Nordholt, J E; Bame, S J; Barraclough, B L; Gosling, J T

    1990-01-01

    A revolutionary type of three-dimensional space plasma composition analyzer has been developed that combines very high-resolution mass composition measurements on a fraction of the incident ions simultaneously with lower mass resolution but high sensitivity measurements of the remaining population in a single compact and robust sensor design. Whereas the lower mass resolution measurements are achieved using conventional energy/charge (E/q) and linear time-of-flight analysis, the high mass resolution measurements are made by timing reflected E/q analyzed ions in a linear electric field (LEF). In a LEF the restoring (reflecting) force that an ion experiences in the direction parallel to the field is proportional to the depth it travels into the LEF region, and its equation of motion in that direction is that of a simple harmonic oscillator. Consequently, an ion's travel time is independent of its initial angle and energy and is simply proportional to the square root of the ion's mass/charge (m/q). The measured m/q resolution, (m/q)/Delta(m/q), for a small LEF-based prototype that we have developed and tested is approximately 20. In addition, our laboratory measurements with the prototype instrument show that characteristic time-of-flight spectra allow the resolution of atomic and molecular species with nearly identical m/q values. The measured response of the prototype is in excellent agreement with computer simulations of the device. Advanced design work using this computer simulation indicates that three-dimensional plasma composition analyzers with m/q resolutions of at least 50 are readily achievable. PMID:11607095

  5. High mass X-ray binaries in the MilkyWay and beyond: a multiwavelength temporal and spectroscopic study

    NASA Astrophysics Data System (ADS)

    Bartlett, Elizabeth

    2013-06-01

    High Mass X-ray Binaries (HMXBs) represent an important stage in the evolution of massive stars and are some of the brightest sources in the X-ray sky. In the first half of this thesis a detailed analysis of X-ray observations of two HMXBs, the Be/X-ray Binary (BeXRB) Swift J045106.8-694803 and the supergiant/X-ray Binary XTE J0421+560/CI Camelopardalis, is presented. Simulations of the X-ray spectrum of Swift J045106.8-694803 show that both the spectral and timing properties can be reproduced by a blackbody and power law pulsating ? pi out of phase with each other. The pulse profile of the blackbody is used to determine the angle between the rotation and magnetic axes of the neutron star and the angle between the rotation axis and line of sight. The apparently broad iron line of XTE J0421+560 is decomposed into three intrinsically narrow lines, FeI-Ka, FeIK b and FeXXIV-XXVKa. The light curve extracted in the energy range defined as the Fe-Ka line from the spectral fits shows marginal evidence for a lag when cross correlated with that of the continuum. The lag is interpreted as the light crossing time of the circumbinary torus and implies a radius of 10 AU. The second part of this thesis considers HMXBs as a population. I describe the search for XRBs in the Phoenix dwarf galaxy, a Local Group dwarf irregular galaxy which share many similarities with the Small Magellanic Cloud (SMC), which has an apparent overabundance of HMXBs. Finally, I discuss why the BeXRB population in the SMC is ideal for population studies and outline the work done to search for evidence for two different neutron star formation channels in their physical parameters

  6. OT2_pcaselli_8: Unveiling the initial conditions of high-mass star and stellar cluster formation

    NASA Astrophysics Data System (ADS)

    Caselli, P.

    2011-09-01

    This proposal will help answer two major open questions in the field of star formation: 1) What causes a particular region of a molecular cloud to attain high densities on the way to forming a star cluster? 2) What is the physical structure of such ``pre-star-cluster" massive clumps? We plan to study the structure and kinematics of the envelope and the dense gas in four massive (M > 100 M_sun) pre-star-cluster clumps embedded in Infrared Dark Clouds. The selected objects have physical and chemical properties which resemble scaled-up versions of low-mass pre-stellar cores (they are cold, dense and show large abundances of deuterated molecules). They are also dark at 24&70 micron within the Herschel beam in Band 1. Therefore, they are the ideal targets where to study the initial conditions in the process of high-mass and stellar cluster formation. We plan to simultaneosly observe ortho-H2O(1_10-1_01) (in absorption) and ortho-NH3(1_1-0_1) (in emission) to study the kinematics of the clump and the embedded dense cores. These results will also be compared to recent work toward low-mass pre-stellar cores to study how different environments affect the chemistry and the dynamical evolution of the earliest stages of star formation. We also plan to observe CO(8-7), (9-8) and (10-9) to investigate if turbulence dissipation and shocks play an important role in the formation of dense cores and fragmentation of massive clumps. These observations are based on comprehensive MHD shock and PDR model predictions.

  7. Herschel Observations of Dust around the High-mass X-Ray Binary GX 301-2

    NASA Astrophysics Data System (ADS)

    Servillat, M.; Coleiro, A.; Chaty, S.; Rahoui, F.; Zurita Heras, J. A.

    2014-12-01

    We aim at characterizing the structure of the gas and dust around the high-mass X-ray binary GX 301-2, a highly obscured X-ray binary hosting a hypergiant (HG) star and a neutron star, in order to better constrain its evolution. We used Herschel PACS to observe GX 301-2 in the far infrared and completed the spectral energy distribution of the source using published data or catalogs from the optical to the radio range (0.4 to 4 × 104 ?m). GX 301-2 is detected for the first time at 70 and 100 ?m. We fitted different models of circumstellar (CS) environments to the data. All tested models are statistically acceptable, and consistent with an HG star at ~3 kpc. We found that the addition of a free-free emission component from the strong stellar wind is required and could dominate the far-infrared flux. Through comparisons with similar systems and discussion on the estimated model parameters, we favor a disk-like CS environment of ~8 AU that would enshroud the binary system. The temperature goes down to ~200 K at the edge of the disk, allowing for dust formation. This disk is probably a rimmed viscous disk with an inner rim at the temperature of the dust sublimation temperature (~1500 K). The similarities between the HG GX 301-2, B[e] supergiants, and the highly obscured X-ray binaries (particularly IGR J16318-4848) are strengthened. GX 301-2 might represent a transition stage in the evolution of massive stars in binary systems, connecting supergiant B[e] systems to luminous blue variables.

  8. MAXI/GSC detection of a new X-ray activity of high-mass X-ray binary pulsar, 2S 1553-542.

    NASA Astrophysics Data System (ADS)

    Sugizaki, M.; Mihara, T.; Negoro, H.; Ueno, S.; Tomida, H.; Nakahira, S.; Kimura, M.; Ishikawa, M.; Nakagawa, Y. E.; Morii, M.; Serino, M.; Sugimoto, J.; Takagi, T.; Yoshikawa, A.; Matsuoka, M.; Kawai, N.; Yoshii, T.; Tachibana, Y.; Yoshida, A.; Sakamoto, T.; Kawakubo, Y.; Ohtsuki, H.; Tsunemi, H.; Uchida, D.; Nakajima, M.; Fukushima, K.; Onodera, T.; Suzuki, K.; Namba, T.; Fujita, M.; Honda, F.; Ueda, Y.; Shidatsu, M.; Kawamuro, T.; Hori, T.; Tsuboi, Y.; Kawagoe, A.; Yamauchi, M.; Morooka, Y.; Itoh, D.; Yamaoka, K.

    2015-02-01

    The MAX/GSC detected the increase of X-ray flux from the position consistent with the high mass X-ray binary pulsar, 2S 1553-542. The light curve indicates that the current activity started on around January 28 (MJD 57050) and the flux has been increasing gradually.

  9. The mass function of hydrogen-rich white dwarfs: robust observational evidence for a distinctive high-mass excess near 1Msun

    E-print Network

    Rebassa-Mansergas, A; Liu, X -W; Han, Z; Garcia-Berro, E

    2015-01-01

    The mass function of hydrogen-rich atmosphere white dwarfs has been frequently found to reveal a distinctive high-mass excess near 1Msun. However, a significant excess of massive white dwarfs has not been detected in the mass function of the largest white dwarf catalogue to date from the Sloan Digital Sky Survey. Hence, whether a high-mass excess exists or not has remained an open question. In this work we build the mass function of the latest catalogue of data release 10 SDSS hydrogen-rich white dwarfs, including the cool and faint population (i.e. effective temperatures 6,000 ~ 12,000 K, Mbol <~ 12 mag) are considered. This naturally explains why previous SDSS mass functions failed at detecting a significant excess of high-mass white dwarfs. Thus, our results provide additional and robust observational evidence for the existence of a distinctive high-mass excess near 1Msun. We investigate possible origins of this feature and argue that the most plausible scenario that may lead to an observed excess of ma...

  10. Gallium nitride nanowire electromechanical resonators

    NASA Astrophysics Data System (ADS)

    Gray, Jason Michael

    Nanoscale mechanical resonators are of great interest for high-resolution sensing applications, where the small resonator mass and high quality factor (Q, defined as resonance frequency f0 over full width at half maximum power) lead to unprecedented sensitivity. Here, we investigate gallium nitride (GaN) nanowire (NW) resonators. The single-crystal, c-axis NWs are 5 mum -- 20 mum long, with diameters from 50 nm -- 500 nm, and grow essentially free of defects. Our initial experiments involve measuring the resonances of as-grown NWs in a scanning electron microscope, where we observe exceptionally high Q values of 10 4 -- 105, one to two orders of magnitude higher than most NWs of comparable size. Using a single NW as a mass sensor, we then demonstrate a sub-attogram mass sensitivity. To provide a more flexible measurement technique that avoids electron-microscope detection, we fabricate doubly clamped NWs with an entirely electronic drive and readout scheme using a combination of lithographic patterning and dielectrophoresis. An electrostatic gate induces vibration, while readout utilizes the piezoresistivity of GaN. Observed resonances range from 9--36 MHz with Q values typically around 103 at room temperature and 10 -4 Pa. We use the behavior of f0 and Q to sense the NW's local environment, such as the additional sources of energy dissipation not present in the as-grown NWs. By cooling the device to 8 K, Q increases by an order of magnitude to above 104, with a highest value to date of 26,000 under vacuum. We explore additional NW properties through the thermal noise in the NW's mechanical motion and the exponential decay of mechanical motion in the presence of burst drive. Finally, we investigate the low-frequency 1/f parameter noise displayed by f0. We show that the noise in f0 is consistent with noise in the NW's resistance leading to temperature noise from local Joule heating, which in turn generates resonance frequency noise. For sensor applications, there will be optimal drive conditions that balance the f 0 noise with the signal-to-noise ratio of the system. With these insights, along with the simple drive and readout technique, these GaN-NW doubly clamped resonators have significant potential for high-resolution sensing applications.

  11. Resonances in photon-photon scattering

    SciTech Connect

    Chanowitz, M.S.

    1984-11-01

    A quantity called stickiness is introduced which should be largest for J not equal to 0 glueballs and can be measured in two photon scattering and radiative J/psi decay. An argument is reviewed suggesting that light J = 0 glueballs may have large couplings to two photons. The analysis of radiative decays of eta and eta' is reviewed and a plea made to desist from false claims that they are related to GAMMA(..pi../sup 0/ ..-->.. ..gamma gamma..) by SU(3) symmetry. It is shown that two photon studies can refute the difficult-to-refute hypothesis that xi(2220) or zeta(8320) are Higgs bosons. A gallery of rogue resonances and resonance candidates is presented which would usefully be studied in ..gamma gamma.. scattering, including especially the low mass dipion. 34 references.

  12. Small Molecule Immunosensing Using Surface Plasmon Resonance

    PubMed Central

    Mitchell, John

    2010-01-01

    Surface plasmon resonance (SPR) biosensors utilize refractive index changes to sensitively detect mass changes at noble metal sensor surface interfaces. As such, they have been extensively applied to immunoassays of large molecules, where their high mass and use of sandwich immunoassay formats can result in excellent sensitivity. Small molecule immunosensing using SPR is more challenging. It requires antibodies or high-mass or noble metal labels to provide the required signal for ultrasensitive assays. Also, it can suffer from steric hindrance between the small antigen and large antibodies. However, new studies are increasingly meeting these and other challenges to offer highly sensitive small molecule immunosensor technologies through careful consideration of sensor interface design and signal enhancement. This review examines the application of SPR transduction technologies to small molecule immunoassays directed to different classes of small molecule antigens, including the steroid hormones, toxins, drugs and explosives residues. Also considered are the matrix effects resulting from measurement in chemically complex samples, the construction of stable sensor surfaces and the development of multiplexed assays capable of detecting several compounds at once. Assay design approaches are discussed and related to the sensitivities obtained. PMID:22163605

  13. Study of the D0 ---> pi- pi+ pi- pi+ decay

    SciTech Connect

    Link, J.M.; Yager, P.M.; /UC, Davis; Anjos, J.C.; Bediaga, I.; Castromonte, C.; Machado, A.A.; Magnin, J.; Massafferri, A.; de Miranda, J.M.; Pepe, I.M.; Polycarpo, E.; /Rio de Janeiro, CBPF /CINVESTAV, IPN /Colorado U. /Fermilab /Frascati /Guanajuato U. /Illinois U., Urbana /Indiana U. /Korea U. /Kyungpook Natl. U. /INFN, Milan /Milan U.

    2007-01-01

    Using data from the FOCUS (E831) experiment at Fermilab, they present new measurements for the Cabbibo-suppressed decay mode D{sup 0} {yields} {pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +}. They measure the branching ratio {Lambda}(D{sup 0} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -})/{Lambda}(D{sup 0} {yields} K{sup -} {pi}{sup +}{pi}{sup -}{pi}{sup +}) = 0.0914 {+-} 0.0018 {+-} 0.0022. An amplitude analysis has been performed, a first for this channel, in order to determine the resonant substructure of this decay mode. The dominant component is the decay D{sup 0} {yields} a{sub 1}(1260){sup +}{pi}{sup -}, accounting for 60% of the decay rate. The second most dominant contribution comes from the decay D{sup 0} {yields} {rho}(770){sup 0}{rho}(770){sup 0}, with a fraction of 25%. They also study the a{sub 1}(1260) line shape and resonant substructure. Using the helicity formalism for the angular distribution of the decay D{sup 0} {yields} {rho}(770){sup 0}{rho}(770){sup 0}, they measure a longitudinal polarization of P{sub L} = (71 {+-} 4 {+-} 2)%.

  14. Coherent resonant x-ray scattering from a rotating medium.

    PubMed

    Rohlsberger, R; Toellner, T S; Sturhahn, W; Quast, K W; Alp, E E; Bernhard, A; Burkel, E; Leupold, O; Gerdau, E

    2000-01-31

    A coherently excited nuclear state in a rotating sample acquires a phase shift during its time evolution that is proportional to its angular momentum and the rotation angle. As a consequence, the radiative decay of the excited state proceeds into the rotated direction, and the time spectrum of the nuclear decay is mapped onto an angular scale. This effect has been observed in nuclear resonant scattering of synchrotron radiation from a 57Fe metal foil rotating at 18 kHz. PMID:11017427

  15. Regenerative feedback resonant circuit

    SciTech Connect

    Jones, A. Mark; Kelly, James F.; McCloy, John S.; McMakin, Douglas L.

    2014-09-02

    A regenerative feedback resonant circuit for measuring a transient response in a loop is disclosed. The circuit includes an amplifier for generating a signal in the loop. The circuit further includes a resonator having a resonant cavity and a material located within the cavity. The signal sent into the resonator produces a resonant frequency. A variation of the resonant frequency due to perturbations in electromagnetic properties of the material is measured.

  16. Double beta decay experiments

    E-print Network

    A. S. Barabash

    2006-02-22

    The present status of double beta decay experiments are reviewed. The results of the most sensitive experiments, NEMO-3 and CUORICINO, are discussed. Proposals for future double beta decay experiments are considered. In these experiments sensitivity for the effective neutrino mass will be on the level of (0.1-0.01) eV.

  17. Beta Decay of Hyperons

    Microsoft Academic Search

    Reinhard Oehme; Roland Winston; Augusto Garcia

    1971-01-01

    The formulas for spin and angular correlations in hyperon beta decay are brought into forms which can give specific information about the character of possible deviations from the universal SU(3) scheme. The recent experimental results for Lambda-particle beta decay are discussed qualitatively in terms of the proposed combinations of integrated correlation coefficients.

  18. Double beta decay experiments

    E-print Network

    A. S. Barabash

    2011-07-28

    The present status of double beta decay experiments is reviewed. The results of the most sensitive experiments are discussed. Proposals for future double beta decay experiments with a sensitivity to the $$ at the level of (0.01--0.1) eV are considered.

  19. The Decayed Pumpkin

    NSDL National Science Digital Library

    2014-04-30

    In this "Sid the Science Kid" activity, learners explore the effects of decay by comparing and contrasting something (an old pumpkin) that's decayed with the same thing before it changes (a fresh pumpkin). Use this activity during the Fall and Halloween! This activity includes a "Sid the Science Kid" video showing how to conduct the investigation.

  20. Accelerated Decay: Theoretical Models

    Microsoft Academic Search

    Eugene F. Chaffin

    2003-01-01

    I discuss the possibility of variation of coupling constants and particle masses within modern physics. Quantum mechanical calculations are presented giving the decay constant for alpha decay and its variation with depth of the nuclear potential well. Finally, a concrete, numerical approach is given for the possible variation of the Fermi constant over the history of the earth.

  1. Multiplicity Fluctuations in Hadron-Resonance Gas

    E-print Network

    V. V. Begun; M. I. Gorenstein; M. Hauer; V. P. Konchakovski; O. S. Zozulya

    2006-06-20

    The charged hadron multiplicity fluctuations are considered in the canonical ensemble. The microscopic correlator method is extended to include three conserved charges: baryon number, electric charge and strangeness. The analytical formulae are presented that allow to include resonance decay contributions to correlations and fluctuations. We make the predictions for the scaled variances of negative, positive and all charged hadrons in the most central Pb+Pb (Au+Au) collisions for different collision energies from SIS and AGS to SPS and RHIC.

  2. High-Mass X-ray Binaries in our Backyard: Studying Their Formation and Evolution in the Magellanic Clouds

    NASA Astrophysics Data System (ADS)

    Antoniou, Vallia

    2013-04-01

    Our nearest star-forming galaxy, the Large Magellanic Cloud (LMC), offers unique insights into the observational characteristics of young (<100 Myr) X-ray binaries (XRBs) in other distant star-forming galaxies for which these faint luminosity levels are out of reach. The number of currently known High-Mass X-ray Binaries (HXMBs) in this galaxy 40) allows the investigation of the parameters affecting their formation, such as the star-formation rate, the age of the parent stellar populations and the metallicity. Most importantly though, it allows for a direct comparison with the well-studied population of HMXBs in the Small Magellanic Cloud (SMC). We find that the HMXBs (and as expected the X-ray pulsars) are shown in regions with star-formation rate bursts ~6-25 Myr ago, in contrast to the SMC, for which this population peaks at later ages 25-60 Myr ago), a direct result of the younger parent stellar populations in the LMC. Although the SMC is widely believed to have lower metallicity than the LMC 1/5Zsun and ~1/3Zsun, respectively), in this work we have used the available star-formation history for the youngest stellar populations, even if this resulted in the same metallicity 1/2Zsun for Zsun=0.0134) for the HMXB populations in both Magellanic Clouds, thus in this work we do not investigate directly the effect of metallicity. Using the mean offset between each HMXB and its nearest star cluster, we estimate the distance that the HMXBs may have travelled since birth. Although the HMXBs in the LMC seem to travel twice as large distances as their counterparts in the SMC, at the same time they are significantly younger than the HMXBs in the SMC (i.e. with ages of ~6-25 Myr and ~25-60 Myr, respectively). For this reason, we derive similar kick velocities for the HMXBs in both galaxies, which are also in agreement with values estimated for the Galactic systems 10-20 km/s). The young XRBs are tracers of past populations of massive stars, while the study of their compact objects help us understand general relativity and the physics of ultra-dense matter. This work is supported by the National Aeronautics and Space Administration under Grant No. NNX10AH47G issued through the Astrophysics Data Analysis Program.

  3. The VLT-FLAMES Tarantula Survey. IV. Candidates for isolated high-mass star formation in 30 Doradus

    NASA Astrophysics Data System (ADS)

    Bressert, E.; Bastian, N.; Evans, C. J.; Sana, H.; Hénault-Brunet, V.; Goodwin, S. P.; Parker, R. J.; Gieles, M.; Bestenlehner, J. M.; Vink, J. S.; Taylor, W. D.; Crowther, P. A.; Longmore, S. N.; Gräfener, G.; Maíz Apellániz, J.; de Koter, A.; Cantiello, M.; Kruijssen, J. M. D.

    2012-06-01

    Whether massive stars (?30 M?) can occasionally form in relative isolation (e.g. in clusters with M < 100 M?) or if they require a large cluster of lower-mass stars around them is a key test in the differentiation of star-formation theories as well as how the initial mass function of stars is sampled. Previous attempts to find O-type stars that formed in isolation were hindered by the possibility that such stars are merely runaways from clusters, i.e., their current isolation does not reflect their birth conditions. We introduce a new method to find O-type stars that are not affected by such a degeneracy. Using the VLT-FLAMES Tarantula Survey and additional high resolution imaging we have identified stars that satisfy the following constraints: 1) they are O-type stars that are not detected to be part of a binary system based on radial velocity (RV) time series analysis; 2) they are designated spectral type O7 or earlier; 3) their velocities are within 1? of the mean of OB-type stars in the 30 Doradus region, i.e. they are not runaways along our line-of-sight; 4) the projected surface density of stars does not increase within 3 pc towards the O-star (no evidence for clusters); 5) their sight lines are associated with gaseous and/or dusty filaments in the interstellar medium (ISM); and 6) if a second candidate is found in the direction of the same filament with which the target is associated, both are required to have similar velocities. With these criteria, we have identified 15 stars in the 30 Doradus region, which are strong candidates for being high-mass stars that have formed in isolation. Additionally, we employed extensive Monte Carlo stellar cluster simulations to confirm that our results rule out the presence of clusters around the candidates. Eleven of these are classified as Vz stars, possibly associated with the zero-age main sequence. We include a newly discovered Wolf-Rayet star as a candidate, although it does not meet all of the above criteria. Appendices are available in electronic form at http://www.aanda.org

  4. Can 21-cm observations discriminate between high-mass and low-mass galaxies as reionization sources?

    NASA Astrophysics Data System (ADS)

    Iliev, Ilian T.; Mellema, Garrelt; Shapiro, Paul R.; Pen, Ue-Li; Mao, Yi; Koda, Jun; Ahn, Kyungjin

    2012-07-01

    The prospect of detecting the first galaxies by observing their impact on the intergalactic medium (IGM) as they reionized it during the first billion years leads us to ask whether such indirect observations are capable of diagnosing which types of galaxies were most responsible for reionization. We attempt to answer this with new large-scale radiative transfer simulations of reionization including the entire mass range of atomically cooling haloes (M > 108 M?). We divide these haloes into two groups, high-mass, atomically cooling haloes, or HMACHs (M > 109 M?), and low-mass, atomically cooling haloes, or LMACHs (108 < M < 109 M?), the latter being susceptible to negative feedback due to Jeans mass filtering in ionized regions, which leads to a process we refer to as self-regulation. We focus here on predictions of the redshifted 21-cm emission, to see if upcoming observations are capable of distinguishing a universe ionized primarily by HMACHs from one in which both HMACHs and LMACHs are responsible, and to see how these results depend upon the uncertain source efficiencies. We find that 21-cm fluctuation power spectra observed by the first-generation Epoch of Reionization 21-cm radio interferometer arrays should be able to distinguish the case of reionization by HMACHs alone from that by both HMACHs and LMACHs, together. Some reionization scenarios, e.g. one with abundant low-efficiency sources versus one with self-regulation, yield very similar power spectra and rms evolution and thus can only be discriminated by their different mean reionization history and 21-cm probability distribution function (PDF) distributions. We also find that the skewness of the 21-cm PDF distribution smoothed with Low Frequency Array (LOFAR)-like resolution shows a clear feature correlated with the rise of the rms due to patchiness. This is independent of the reionization scenario and thus provides a new approach for detecting the rise of large-scale patchiness. The peak epoch of the 21-cm rms fluctuations depends significantly on the beam and bandwidth smoothing size as well as on the reionization scenario and can occur for ionized fractions as low as 30 per cent and as high as 70 per cent. Measurements of the mean photoionization rates are sensitive to the average density of the regions being studied and therefore could be strongly skewed in certain cases. Finally, the simulation volume employed has very modest effects on the results during the early and intermediate stages of reionization, but late-time signatures could be significantly affected.

  5. Clumped stellar winds in supergiant high-mass X-ray binaries: X-ray variability and photoionization

    NASA Astrophysics Data System (ADS)

    Oskinova, L. M.; Feldmeier, A.; Kretschmar, P.

    2012-04-01

    The clumping of massive star winds is an established paradigm, which is confirmed by multiple lines of evidence and is supported by stellar wind theory. The purpose of this paper is to bridge the gap between detailed models of inhomogeneous stellar winds in single stars and the phenomenological description of donor winds in supergiant high-mass X-ray binaries (HMXBs). We use the results from time-dependent hydrodynamical models of the instability in the line-driven wind of a massive supergiant star to derive the time-dependent accretion rate on to a compact object in the Bondi-Hoyle-Lyttleton approximation. The strong density and velocity fluctuations in the wind result in strong variability of the synthetic X-ray light curves. The model predicts a large-scale X-ray variability, up to eight orders of magnitude, on relatively short time-scales. The apparent lack of evidence for such strong variability in the observed HMXBs indicates that the details of the accretion process act to reduce the variability resulting from the stellar wind velocity and density jumps. We study the absorption of X-rays in the clumped stellar wind by means of a two-dimensional stochastic wind model. The monochromatic absorption in the cool stellar wind, depending on the orbital phase, is computed for realistic stellar wind opacity. We find that the absorption of X-rays changes strongly at different orbital phases. The degree of the variability resulting from the absorption in the wind depends on the shape of the wind clumps, and this is stronger for oblate clumps. We address the photoionization in the clumped wind, and we show that the degree of ionization is affected by the wind clumping. We derive a correction factor for the photoionization parameter, and we show that the photoionization parameter is reduced by a factor ? compared to the smooth wind models with the same mass-loss rate, where ? is the wind inhomogeneity parameter. We conclude that wind clumping must also be taken into account when comparing the observed and model spectra of the photoionized stellar wind.

  6. Evidence for a Second F35 Pion-Nucleon Resonance near 2000 MeV

    NASA Astrophysics Data System (ADS)

    Manley, D. Mark

    1984-06-01

    A recent isobar-model, partial-wave analysis of ?N-->??N finds strong indications of the F35 pion-nucleon resonance belonging to the (70,L=2+) baryon multiplet. This conclusion is drawn from recent predictions of baryon decays obtained with baryon compositions determined by the Isgur-Karl quark model. The highly inelastic F35 resonance is observed through its dominant p-wave decay to ?N.

  7. Evidence for a Second F35 Pion-Nucleon Resonance near 2000 MeV

    Microsoft Academic Search

    D. Mark Manley

    1984-01-01

    A recent isobar-model, partial-wave analysis of piN-->pipiN finds strong indications of the F35 pion-nucleon resonance belonging to the (70,L=2+) baryon multiplet. This conclusion is drawn from recent predictions of baryon decays obtained with baryon compositions determined by the Isgur-Karl quark model. The highly inelastic F35 resonance is observed through its dominant p-wave decay to rhoN.

  8. First search for double $?$ decay of dysprosium

    E-print Network

    P. Belli; R. Bernabei; F. Cappella; R. Cerulli; F. A. Danevich; S. d'Angelo; M. L. Di Vacri; A. Incicchitti; M. Laubenstein; S. S. Nagorny; S. Nisi; A. V. Tolmachev; V. I. Tretyak; R. P. Yavetskiy

    2011-03-28

    A search for double $\\beta$ decay of dysprosium was realized for the first time with the help of an ultra low-background HP Ge $\\gamma$ detector. After 2512 h of data taking with a 322 g sample of dysprosium oxide limits on double beta processes in $^{156}$Dy and $^{158}$Dy have been established on the level of $T_{1/2}\\geq 10^{14}-10^{16}$ yr. Possible resonant double electron captures in $^{156}$Dy and $^{158}$Dy were restricted on a similar level. As a by-product of the experiment we have measured the radioactive contamination of the Dy$_2$O$_3$ sample and set limits on the $\\alpha$ decay of dysprosium isotopes to the excited levels of daughter nuclei as $T_{1/2}\\geq 10^{15} - 10^{17}$ yr.

  9. PROSPECTS FOR DISCOVERY OF THE ?- ? ?-?+?-?? DECAYS

    NASA Astrophysics Data System (ADS)

    Roig, Pablo

    2014-12-01

    We study the phenomenology of the ?- ? ?-???+?- decays (? = e, ?), predicting the respective branching ratios and di-lepton invariant-mass spectra. In addition to the model-independent (QED) contributions, we investigate the structure-dependent (SD) terms, encoding features of the hadronization of QCD currents. The relevant form factors are evaluated by supplementing Chiral Perturbation Theory with the inclusion of the lightest (axial-)vector resonance multiplet as dynamical fields. The Lagrangian couplings are fully predicted requiring the known QCD asymptotic behavior to the relevant Green functions and associated form factors in the limit of an infinite number of colours. As a consequence we predict that the ?- ? ?-??e+e- decays should be discovered soon while this is not granted for the ? = ? case.