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1

Search for High Mass Resonances Decaying to Muon Pairs in s=1.96TeV pp¯ Collisions  

NASA Astrophysics Data System (ADS)

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 4.6fb-1 of integrated luminosity collected by the CDF detector in pp¯ collisions at s=1960GeV, 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>1071GeV/c2 at 95% confidence level for a Z' boson with the same couplings to fermions as the Z boson.

Aaltonen, T.; Álvarez 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.

2011-03-01

2

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

Microsoft Academic Search

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,

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

3

Search for high-mass resonances decaying into ZZ in pp¯ collisions at s=1.96TeV  

NASA Astrophysics Data System (ADS)

We search for high-mass resonances decaying into Z boson pairs using data corresponding to 6fb-1 collected by the CDF experiment in pp¯ collisions at s=1.96TeV. The search is performed in three distinct final states: ZZ??+?-?+?-, ZZ??+?-??, and ZZ??+?-jj. For a Randall-Sundrum graviton G*, the 95% CL upper limits on the production cross section times branching ratio to ZZ, ?(pp¯?G*?ZZ), vary between 0.26 pb and 0.045 pb in the mass range 300

Aaltonen, T.; Álvarez González, B.; 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.; Bisello, D.; Bizjak, I.; 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.; Buzatu, A.; Calamba, A.; Calancha, C.; Camarda, S.; Campanelli, M.; Campbell, M.; Canelli, F.; 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.; Chung, W. H.; Chung, Y. S.; Ciocci, M. A.; Clark, A.; Clarke, C.; Compostella, G.; Convery, M. E.; Conway, J.; Corbo, M.; Cordelli, M.; Cox, C. A.; Cox, D. J.; Crescioli, F.; Cuevas, J.; Culbertson, R.; Dagenhart, D.; D'Ascenzo, N.; Datta, M.; de Barbaro, P.; Dell'Orso, M.; Demortier, L.; 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, S.; Ershaidat, N.; Eusebi, R.; Farrington, S.; Feindt, M.; Fernandez, J. P.; Field, R.; Flanagan, G.; Forrest, R.; Frank, M. J.; Franklin, M.; Freeman, J. C.; Funakoshi, Y.; Furic, I.; Gallinaro, M.; 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.; 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.; Grinstein, S.; Grosso-Pilcher, C.; Group, R. C.; Guimaraes da Costa, J.; 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.; 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.; Jindariani, S.; Jones, M.; Joo, K. K.; Jun, S. Y.; Junk, T. R.; Kamon, T.; Karchin, P. E.; Kasmi, A.; Kato, Y.; Ketchum, W.; Keung, J.; Khotilovich, V.; 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.; Klimenko, S.; Knoepfel, K.; Kondo, K.; Kong, D. J.; Konigsberg, J.; Kotwal, A. V.; Kreps, M.; Kroll, J.; Krop, D.; 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.; Lecompte, T.; Lee, E.; Lee, H. S.; Lee, J. S.; Lee, S. W.; Leo, S.; Leone, S.; Lewis, J. D.; Limosani, A.; Lin, C.-J.; Lindgren, M.; Lipeles, E.; Lister, A.; Litvintsev, D. O.; Liu, C.; 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.; Maeshima, K.; Maestro, P.; Malik, S.; Manca, G.; Manousakis-Katsikakis, A.; Margaroli, F.; Marino, C.; Martínez, M.; Mastrandrea, P.; Matera, K.; Mattson, M. E.; Mazzacane, A.; Mazzanti, P.; McFarland, K. S.; McIntyre, P.; McNulty, R.; Mehta, A.; Mehtala, P.; 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.; Noh, S. Y.; Norniella, O.; 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.; Poprocki, S.; Potamianos, K.; Prokoshin, F.; Pranko, A.; Ptohos, F.; Punzi, G.; Rahaman, A.; Ramakrishnan, V.; Ranjan, N.; Redondo, I.; Renton, P.; Rescigno, M.; Riddick, T.; Rimondi, F.; Ristori, L.; Robson, A.; Rodrigo, T.; Rodriguez, T.; Rogers, E.; Rolli, S.; Roser, R.; Ruffini, F.; Ruiz, A.; Russ, J.; Rusu, V.; Safonov, A.; Sakumoto, W. K.; Sakurai, Y.

2012-01-01

4

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

NASA Astrophysics Data System (ADS)

This Letter presents a search for high-mass resonances decaying into ?+?- final states using proton-proton collisions at s=7 TeV produced by the Large Hadron Collider. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 4.6 fb-1. No statistically significant excess above the Standard Model expectation is observed; 95% credibility upper limits are set on the cross section times branching fraction of Z? resonances decaying into ?+?- pairs as a function of the resonance mass. As a result, Z? bosons of the Sequential Standard Model with masses less than 1.40 TeV are excluded at 95% credibility.

ATLAS Collaboration Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; 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.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; 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.; Angelidakis, S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Argyropoulos, S.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Atkinson, M.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Backus Mayes, J.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Balek, P.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; 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, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, A. K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; 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.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; 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.; Bittner, B.; Black, C. W.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.

2013-02-01

5

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

SciTech Connect

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.

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

6

Search for High Mass Resonances Decaying to Muon Pairs in $\\sqrt{s}=1.96$ TeV $p\\bar{p}$ Collisions  

SciTech Connect

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 p{bar p} 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{prime} boson with the same couplings to fermions as the Z boson.

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

2011-01-01

7

Search for High-Mass Resonances Decaying to e? in pp¯ Collisions at s=1.96TeV  

NASA Astrophysics Data System (ADS)

We describe a general search for resonances decaying to a neutral e? final state in pp¯ collisions at a center-of-mass energy of 1.96 TeV. Using a data sample representing 344pb-1 of integrated luminosity recorded by the Collider Detector at Fermilab II experiment, we compare standard model predictions with the number of observed events for invariant masses between 50 and 800GeV/c2. Finding no significant excess (5 events observed vs 7.7±0.8 expected for Me?>100GeV/c2), we set limits on sneutrino and Z' masses as functions of lepton family number violating couplings.

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

2006-06-01

8

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

SciTech Connect

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}.

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

9

Search for high-mass resonances decaying to dilepton final states in pp collisions at sqrt{s}=7 TeV with the ATLAS detector  

NASA Astrophysics Data System (ADS)

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 gravitons, Z * bosons, techni-mesons, Kaluza-Klein Z/? bosons, and bosons predicted by Torsion models. Results are presented based on an analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.9 fb-1 in the e + e - channel and 5.0 fb-1 in the ? + ? -channel. A Z ' boson with Standard Model-like couplings is excluded at 95 % confidence level for masses below 2.22 TeV. A Randall-Sundrum graviton with coupling {k / {{{{overline{M}}_{Pl}}}} .}=0.1 is excluded at 95 % confidence level for masses below 2.16 TeV. Limits on the other models are also presented, including Technicolor and Minimal Z' Models.

Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Akdogan, T.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; 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.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A. D.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amorim, A.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Anduaga, X. S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Asfandiyarov, R.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Atkinson, M.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; 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.; 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, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, A. K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Begel, M.; Behar Harpaz, S.; 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.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; 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.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; 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.; Bittner, B.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Bloch, I.; 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.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; 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.; Buat, Q.; Bucci, F.; Buchanan, J.; Buchholz, P.

2012-11-01

10

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

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}.

Tu, Yanjun; /Pennsylvania U.

2008-10-01

11

SEARCH FOR HIGH-MASS RESONANCES DECAYING TO e-mu IN ppbar COLLISIONS AT s**(1/2) = 1.96 TeV  

SciTech Connect

We describe a general search for resonances decaying to a neutral e{mu} final state in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. Using a data sample representing 344 pb{sup -1} of integrated luminosity recorded by the CDF II experiment, we compare Standard Model predictions with the number of observed events for invariant masses between 50 and 800 GeV/c{sup 2}. Finding no significant excess (5 events observed vs. 7.7 {+-} 0.8 expected for M{sub e{mu}} > 100 GeV/c{sup 2}), we set limits on sneutrino and Z' masses as functions of lepton family number violating couplings.

Hahn, Kristian Allan; /Pennsylvania U.

2006-08-01

12

Search for high-mass resonances decaying to e mu in p anti-p collisions at s**(1/2) = 1.96-TeV  

SciTech Connect

The authors describe a general search for resonances decaying to a neutral e{mu} final state in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. Using a data sample representing 344 pb{sup -1} of integrated luminosity recorded by the CDF II experiment, they compare Standard Model predictions with the number of observed events for invariant masses between 50 and 800 GeV/c{sup 2}. Finding no significant excess (5 events observed vs. 7.7 {+-} 0.8 expected for M{sub e{mu}} > 100 GeV/c{sup 2}), they set limits on sneutrino and Z{prime} masses as functions of lepton family number violating couplings.

Abulencia, A.; Acosta, D.; Adelman, Jahred A.; Affolder, T.; Akimoto, T.; Albrow, M.G.; Ambrose, D.; Amerio, S.; Amidei, D.; Anastassov, A.; Anikeev, K.; /Taiwan, Inst. Phys. /Argonne /Barcelona, IFAE /Baylor U. /INFN, Bologna /Bologna U. /Brandeis U. /UC, Davis /UCLA /UC, San Diego /UC, Santa Barbara

2006-03-01

13

Giant resonance decay  

SciTech Connect

Decay studies of giant multipole resonances are discussed, emphasizing the role of Coulomb excitation with intermediate energy heavy ions, which can provide very large cross sections for both isoscalar and isovector resonances. We discuss measurement of the photon decay of one and two phonon giant resonances, reporting results where available. It is pointed out throughout the presentation that the use of E1 photons as a tag'' provides a means to observe weakly excited resonances that cannot be observed in the singles spectra. 30 refs., 16 figs., 1 tab.

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

1990-01-01

14

resonant Auger decay  

Microsoft Academic Search

The Ar resonant Auger spectra have been recorded in Raman conditions at a photon energy of 249 eV corresponding to the Ar 2p1\\/2 ? 3d excitation. The high experimental resolution allowed us to resolve the fine structure in the resonant Auger spectra in much greater detail than obtained previously. Experimental individual angular anisotropy ? parameter values of the Ar 2p?1

S Osmekhin; S Fritzsche; A N Grum-Grzhimailo; H Aksela; S Aksela

15

Search for high mass resonances in dilepton, dijet and diboson final states at the Tevatron  

SciTech Connect

At hadron colliders, new massive particles can be searched for by the observation of high transverse momentum objects forming high-mass resonances. Searches for additional massive vector bosons (W{prime},Z{prime}), Randall-Sundrum gravitons and sneutrinos in R-parity violating scenarios are performed in dilepton, dijets and diboson final states. The most recent results from the CDF and D0 experiments at the Tevatron are presented corresponding to integrated luminosities between 1 and 4 fb{sup -1}.

Jaffre, Michel; /Orsay, LAL

2009-09-01

16

Decay Modes of Narrow Molecular Resonances  

NASA Astrophysics Data System (ADS)

The heavy-ion radiative capture reactions 12C(12C,?)24Mg and 12C(16O,?)28Si have been performed on and off resonance at TRIUMF using the Dragon separator and its associated BGO array. The decay of the studied narrow resonances has been shown to proceed predominantly through quasi-bound doorway states which cluster and deformed configurations would have a large overlap with the entry resonance states.

Courtin, S.; Haas, F.; Salsac, M.-D.; Lebhertz, D.; Michalon, A.; Beck, C.; Rousseau, M.; Zafra, A. Sanchez I.; Jenkins, D. G.; Glover, R. G.; Kent, P. E.; Hutcheon, D.; Davis, C.; Pearson, J. E.; Dragon Collaboration

2006-08-01

17

On representing resonances and decaying states  

NASA Astrophysics Data System (ADS)

Hilbert space quantum mechanics is time-symmetric, but the rigged Hilbert space formulation, which arose from Dirac's bra-ket formalism, allows the choice of asymmetric boundary conditions for representing resonances. Resonances are mathematically represented by Gamow kets, functionals over a space of very well-behaved (Hardy class) vectors, which have been chosen by a boundary condition (outgoing for decaying states). Gamow states have all the properties that one heuristically needs for quasistable states. For them the phenomenological signatures such as the cross section or Golden rule can be derived from the fundamental probabilities P (t) = Tr(?(t) W(t0)). In particular, the case of relativistic resonance formation is reviewed and applied to the construction of relativistic Gamow vectors. The relativistic Gamow vectors can be used to fix the definition of mass and width of relativistic resonances like the Z-boson.

Harshman, Nathan Lee

18

Searches for resonances decaying to top  

SciTech Connect

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.

Meyer, Jorg; /Gottingen U.

2008-04-01

19

Resonance decay effects on anisotropy parameters  

SciTech Connect

We present the elliptic flow v{sub 2} of pions produced from resonance decays. The transverse momentum p{sub T} spectra of the parent particles are taken from thermal model fits and their v{sub 2} are fit under the assumption that they follow a number-of-constituent-quark (NCQ) scaling law expected from quark-coalescence models. The v{sub 2} of pions from resonance particle decays is found to be similar to the measured pion v{sub 2}. We also propose the measurement of electron v{sub 2} as a means to extract open-charm v{sub 2} and investigate whether a thermalized system of quasi-free quarks and gluons (a quark-gluon plasma) is created in collisions of Au nuclei at RHIC.

Dong, Xin; Esumi, S.; Sorensen, P.; Xu, Nu; Xu, Z.

2004-03-11

20

Laser desorption studies of high mass biomolecules in Fourier-transform ion cyclotron resonance mass spectrometry.  

PubMed Central

Matrix-assisted laser desorption ionization is used to obtain Fourier-transform ion cyclotron resonance mass spectra of model peptides (e.g., gramicidin S, angiotensin I, renin substrate, melittin, and bovine insulin). Matrix-assisted laser desorption ionization yields ions having appreciable kinetic energies. Two methods for trapping the high kinetic energy ions are described: (i) the ion signal for [M+H]+ ions is shown to increase with increasing trapping voltages, and (ii) collisional relaxation is used for the detection of [M+H]+ ions of bovine insulin. Images

Solouki, T; Russell, D H

1992-01-01

21

High Mass Resolving Power Radio Frequency Glow Discharge Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (RFGD-FTICR/MS)  

SciTech Connect

The combination of a radio frequency glow discharge (rfGD) external ion source with a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer has resulted in the ability to perform high mass resolution elemental analysis of both conductive and nonconductive materials. Samples investigated in the present study include copper, brass, and a National Institute of Standards and Technology (NIST) glass standard, SRM 1412. Analyses of both the copper and the brass materials resulted in ultra-high mass resolving power (m/Dm > 100,000). A mass resolving power of 280,000 (FWHM) was obtained for the 63Cu+ isotope of the copper sample, the highest reported to date for rfGD studies. In addition, study of the SRM 1412 glass standard revealed mass spectral peaks related to metal oxides present in the glass matrix at concentrations of approximately 4 percent (by weight). The resulting preliminary data demonstrate the capabilities of a rfGD-FTICR instrument and its promise as a powerful tool in distinguishing between isobaric and other mass spectral interferences in insulators, as well as conducting materials.

Nichols, L.S.

2001-01-05

22

Ultra High-Mass Resolution Paper Spray by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry  

PubMed Central

Paper Spray Ionization is an atmospheric pressure ionization technique that utilizes an offline electro-osmotic flow to generate ions off a paper medium. This technique can be performed on a Bruker SolariX Fourier transform ion cyclotron resonance mass spectrometer by modifying the existing nanospray source. High-resolution paper spray spectra were obtained for both organic and biological samples to demonstrate the benefit of linking the technique with a high-resolution mass analyzer. Error values in the range 0.23 to 2.14?ppm were obtained for calf lung surfactant extract with broadband mass resolving power (m/?m50%) above 60,000 utilizing an external calibration standard.

Quinn, Kevin D.; Cruickshank, Charmion I.; Wood, Troy D.

2012-01-01

23

Search for high-mass dielectron resonances with the ATLAS detector  

NASA Astrophysics Data System (ADS)

This thesis describes a search for new heavy particles decaying into electron-positron pairs. The search utilizes 1.08 inverse femtobarn of proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 TeV, produced in 2011 by the Large Hadron Collider and recorded with the ATLAS detector at the CERN laboratory in Switzerland. The reconstructed dielectron invariant mass spectrum is compared to Standard Model expectations. Since no significant excess is found, upper limits on the cross-section times branching ratio of Z' bosons and Randall-Sundrum gravitons are determined at the 95% confidence level using a Bayesian approach. These limits are combined with limits obtained by a parallel analysis in the muon channel and converted into lower limits on the masses of the Sequential Standard Model Z' boson (1.88 TeV), E6 Z' bosons (1.54 - 1.68 TeV) as well as the Randall-Sundrum graviton (1.67 TeV for k/M¯Pl = 0.1).

Heim, Sarah

24

Search for high mass ?? resonances ine^ + e^ - to ell ^ + ell ^ - ? ? ,? bar ? ? ? andqbar q? ? at LEP Iat LEP I  

NASA Astrophysics Data System (ADS)

A search for high mass photon pairs from the processese^ + e^ - to ell ^ + ell ^ - ? ? ,e^ + e^ - to qbar q? ? ande^ + e^ - to ? bar ? ? ? with the DELPHI detector at LEP I is reported. From a data sample containing 3.5 million hadronic Z0 decays, collected by DELPHI during the years 1991 to 1994, 79 events with two charged leptons and two isolated photons were selected with photon pair masses above 10 GeV/c2, where 76±6 events were predicted from standard sources. In the same data sample, no? bar ? ? ? candidates were found and no accumulation of events was visible for ?? masses above 10 GeV/c2 in theqbar q? ? channel. Upper limits at 95% confidence level on the Z0 branching ratios for the three different channels were extracted from the data. In the mass region m ?? >30 GeV/c2 the limits obtained are between 3×10-6 and 4×10-6.

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

1996-06-01

25

Search for exclusive multibody non- decays at the resonance.  

PubMed

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. PMID:16486686

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

2006-01-27

26

Heavy ion excitation and photon decay of giant resonances  

SciTech Connect

Results are presented for excitation of giant multipole resonances by inelastic scattering of 350 and 500 MeV /sup 16/O projectiles from /sup 90/Zr and /sup 208/Pb. The giant quadrupole resonance is excited with large cross sections and a very large resonance peak to continuum ratio is obtained. Extracted cross sections agree with DWBA calculations which use standard collective model form factors. Using 380 MeV 170 to excite the giant resonances, the ..gamma..-ray decay has been measured for the giant quadrupole resonance region of /sup 208/Pb. 10 references.

Bertrand, F.E.; Beene, J.R.; Sjoreen, T.P.

1983-01-01

27

Current Drive Using a Resonant Decay Instability.  

National Technical Information Service (NTIS)

The ordinary mode near the second harmonic of electron cyclotron frequency obliquely launched to a tokamak with central density higher than the cutoff density may excite a Langmuir wave by parametric decay instability. It is demonstrated that a steady tra...

K. Matsuda

1989-01-01

28

Charmless 3-BODY B Decays:. Resonant and Nonresonant Contributions  

NASA Astrophysics Data System (ADS)

Charmless 3-body decays of B mesons are studied using a simple model based on the framework of the factorization approach. We have identified a large source of the nonresonant signal in the matrix elements of scalar densities, e.g. < K/line{K}? /line{s}s ? 0 >. This explains the dominance of the nonresonant background in B ? KKK decays, the sizable nonresonant fraction of order (35 40)% in K-?+?- and /line{K}0? +? - modes and the smallness of nonresonant rates in B ? ??? decays. We have computed the resonant and nonresonant contributions to charmless 3-body decays and determined the rates for the quasi-two-body decays B ? VP and B ? SP. Time-dependent CP asymmetries sin 2?eff and ACP in K+K-KS, KSKSKS, KS?+?- and KS?0?0 modes are estimated.

Cheng, Hai-Yang

29

Resonance-assisted decay of nondispersive wave packets.  

PubMed

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

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

2006-07-25

30

J/(psi) production and decay at the Z resonance.  

National Technical Information Service (NTIS)

In the Large Electron Positron collider (LEP) bunches of electrons and positrons are brought in collision. At a collision energy of 91.2 GeV the Z resonance is excited. The Z boson, the uncharged mediator of the weak force, decays into a particle and an a...

P. Vikas

1994-01-01

31

Resonance chiral Lagrangian currents and ? decay Monte Carlo  

NASA Astrophysics Data System (ADS)

In the present paper we describe the set of form factors for hadronic ? 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 the 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. The description of the current for each ? decay mode is complemented with technical numerical tests. The set is ready for fits, paramxers 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 ? decay data, but not yet ready for the general use, cover more than 88% of hadronic ? decay width.

Shekhovtsova, O.; Przedzi?ski, T.; Roig, P.; Wa?, Z.

2012-12-01

32

Search for invisible decays of the {upsilon}(1S) resonance  

SciTech Connect

We present a measurement of the branching fraction of invisible {upsilon}(1S) decays, using 1.2 fb{sup -1} of data collected at the {upsilon}(2S) resonance with the CLEO III detector at CESR. After subtracting expected backgrounds from events that pass selection criteria for invisible {upsilon}(1S) decay in {upsilon}(2S){yields}{pi}{sup +}{pi}{sup -}{upsilon}(1S), we deduce a 90% C.L. upper limit of B[{upsilon}(1S){yields}invisible]<0.39%.

Rubin, P. [George Mason University, Fairfax, Virginia 22030 (United States); Cawlfield, C.; Eisenstein, B. I.; Karliner, I.; Kim, D.; Lowrey, N.; Naik, P.; Selen, M.; White, E. J.; Wiss, J. [University of Illinois, Urbana-Champaign, Illinois 61801 (United States); Mitchell, R. E.; Shepherd, M. R. [Indiana University, Bloomington, Indiana 47405 (United States); Besson, D. [University of Kansas, Lawrence, Kansas 66045 (United States); Pedlar, T. K. [Luther College, Decorah, Iowa 52101 (United States); Cronin-Hennessy, D.; Gao, K. Y.; Hietala, J.; Kubota, Y.; Klein, T.; Lang, B. W. [University of Minnesota, Minneapolis, Minnesota 55455 (United States)] (and others)

2007-02-01

33

? - ?K - ? ( ') ? ? decays in Chiral Perturbation Theory with resonances  

NASA Astrophysics Data System (ADS)

We have studied the ? - ? K - ? ( ') ? ? decays within Chiral Perturbation Theory including resonances as explicit degrees of freedom. We have considered three different form factors according to treatment of final-state interactions. In increasing degree of soundness: Breit-Wigner, exponential resummation and dispersive representation. We find that although the first one fails in accounting for the data on the K? mode, the other two approaches provide good fits to them which are sensitive to the K ? (1410) pole parameters, that are determined to be MeV and MeV. These values are competitive with the standard determination from ? - ? ( K?)- ? ? decays. The corresponding predictions for the ? - ? K - ? ' ? ? channel respect the current upper bound and hint to the discovery of this decay mode in the near future.

Escribano, R.; González-Solís, S.; Roig, P.

2013-10-01

34

A new mass reconstruction technique for resonances decaying to ??  

NASA Astrophysics Data System (ADS)

Accurate reconstruction of the mass of a resonance decaying to a pair of ? leptons is challenging because of the presence of multiple neutrinos from ? decays. The existing methods rely on either a partially reconstructed mass, which has a broad spectrum that reduces sensitivity, or the collinear approximation, which is applicable only to the relatively small fraction of events. We describe a new technique, which provides an accurate mass reconstruction of the original resonance and does not suffer from the limitations of the collinear approximation. The major improvement comes from replacing assumptions of the collinear approximation by a requirement that mutual orientations of the neutrinos and other decay products are consistent with the mass and decay kinematics of a ? lepton. This is achieved by maximizing a probability defined in the kinematically allowed phase space region. In this paper we describe the technique and illustrate its performance using Z/?*??? and H??? events simulated with the realistic detector resolution. The method is also tested on a clean sample of data Z/?*??? events collected by the CDF experiment at the Tevatron. We expect that this new technique will allow for a major improvement in searches for the Higgs boson at both the LHC and the Tevatron.

Elagin, A.; Murat, P.; Pranko, A.; Safonov, A.

2011-10-01

35

High mass resolution SIMS  

NASA Astrophysics Data System (ADS)

We are developing a method to conduct SIMS analysis at high mass resolution ( m/? m>50,000), to facilitate the examination and study of complex organic and biomolecules on surfaces. The approach uses a primary-ion beam probe (rastered 25 keV Ga + ion source), providing high (100 nm) spatial resolution, and an ion cyclotron resonance (ICR) cell, capable of mass analysis at a resolution in excess of 10 5 and mass accuracy of less than 1.0 ppm. The apparatus includes a time-of-flight (ToF) mass analyzer, offering rapid chemical mapping at low ( m/? m<10,000) mass resolution to identify points of interest for subsequent high mass resolution analysis. To combine both ICR and ToF mass analysis in one instrument requires the sample to be near ground potential, to inject secondary ions into the grounded ICR cell at low enough kinetic energies to permit high trapping efficiency. Consequently, the optics and detector for ToF analysis must be electrically floating at the desired acceleration potential for the secondary ions. For high-resolution mass analysis, secondary ions are transmitted to the ICR cell, which is in line-of-sight to the sample and immersed in a homogeneous magnetic field (7 T). Initial results from the instrument show that it is possible to trap simple ions effectively for high-resolution analysis, but high-mass ions ( m/ z>300), although, readily detected by the ToF analyzer, are inefficiently transmitted to the ICR cell. This has stimulated the design of a new ion optics coupling arrangement, which provides a higher mass resolution over a wider mass range.

Maharrey, S.; Bastasz, R.; Behrens, R.; Highley, A.; Hoffer, S.; Kruppa, G.; Whaley, J.

2004-06-01

36

Theory of decay of metastable states in resonant tunneling structures  

NASA Astrophysics Data System (ADS)

The problems of decay of metastable states arise in various fields, including condensed matter physics, quantum field theory, chemical kinetics, and biology. Recently, with advances of miniaturization techniques it became possible to study a new type of system---resonant tunneling structures, such as tunneling diodes and superlattices. The advantage of these devices is that their parameters can be tuned very precisely. This dissertation is devoted to the theory of decay of metastable states in these structures. In a certain range of bias, current-voltage (I-V) characteristics of double-barrier resonant tunneling structures exhibit intrinsic bistability. In the bistable region of the I-V curve two different steady states of current are possible at each value of the bias. Near the upper boundary Vth of the bistable region the upper current state is metastable. This state decays to the stable lower-current state at a random moment in time. As the bias V is tuned into the bistable region from its boundary value Vth, the mean switching time tau increases exponentially. In the first part of this dissertation we find full expressions for tau (including prefactors) as functions of bias, sample geometry, and in-plane conductivity. In particular, in samples of small area we obtain ln tau ? (Vth - V)3/2, while in larger samples ln tau ? (Vth - V). Our results take universal form upon appropriate renormalization of the threshold voltage Vth. We also show that in large samples the switching process initiates inside, at the edge, or at a corner of the sample depending on the parameters of the system. The second part is devoted to the study of the switching time in the special case of strip-shaped devices, with the width small compared to the length. We show that in long strips ln tau ? (Vth - V)5/4. The one-dimensional geometry of the problem enables us to obtain exact analytical expressions for both the exponential and the prefactor of tau as functions of bias, in-plane conductivity, and length of the strip. Furthermore, we show that, depending on the parameters of the system, the switching can be initiated either in the middle of the strip, or at its ends.

Tretiakov, Oleg A.

37

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 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

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

38

Bounding resonant Majorana neutrinos from four-body B and D decays  

NASA Astrophysics Data System (ADS)

Searches of lepton-number violation in different processes are very useful to constrain the parameter space of Majorana neutrinos. Here we use available upper bounds on the branching fractions of B-?D0?+?-?- and D0?(?-?-/K-?-)?-?- decays to derive constraints on the mass and mixings of Majorana neutrinos by assuming they are produced resonantly in these four-body decays. While the excluded region obtained from B- decays are competitive with existing limits from three-body D- and B- decays, it is shown that experimental improvements on D0 decays offer a good potential to provide similar results.

López Castro, G.; Quintero, N.

2013-04-01

39

Observation of a Resonance in B^{+}?K^{+}?^{+}?^{-} Decays at Low Recoil.  

PubMed

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/c^{2} and 65_{-16}^{+22}??MeV/c^{2}, 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/c^{2}. This contribution is larger than theoretical estimates. PMID:24074076

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

2013-09-10

40

Observation of a Resonance in B+?K+?+?- Decays at Low Recoil  

NASA Astrophysics Data System (ADS)

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+9MeV/c2 and 65-16+22MeV/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 3770MeV/c2. This contribution is larger than theoretical estimates.

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., Jr.; 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.

2013-09-01

41

Statistical and nonstatistical neutron decay of the giant electric dipole resonance of 208Pb  

Microsoft Academic Search

The neutron decay of the giant electric dipole resonance of 208Pb has been determined by a measurement of the differential cross section, dsigma(Egamma,En)\\/dEn of the 208Pb(gamma,n) reaction for 20 contiguous photon energy bands between 11.2 and 15.7 MeV. The statistical component of the decay was calculated in the Hauser-Feshbach formalism. A nonstatistical component of the decay to low-lying hole states

R. Alarcon; P. L. Cole; D. S. Dale; P. T. Debevec; L. J. Morford

1991-01-01

42

Non-resonant contribution in non-leptonic charm meson decays  

SciTech Connect

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 +}.

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

43

Search for a narrow resonance in Z0 decays into hadrons and isolated photons  

NASA Astrophysics Data System (ADS)

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, as expected for Higgs production, e+e-?Z0?H0 ? withH^0 to bbar b, in the Standard Model or some of its extensions. No evidence for such a resonance is observed in a sample of about 5 million produced Z0’s. The results are interpreted in terms of models of non-standard Higgs production. An update of a search for a resonance produced in association with hadrons and the subsequent resonance decay into two photons is also presented.

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

1996-03-01

44

A study of the Roper resonance as a hybrid state from J/? decays  

NASA Astrophysics Data System (ADS)

The structure of the Roper resonance as a hybrid baryon is investigated through studying the transitional amplitudes in J/??p¯N*, N¯*N* decays. We begin with perturbative QCD to describe the dynamical process for the J/??3q¯+3q decay to the lowest order of ?s, and by extending the modified quark creation model to the J/? energy region to describe the J/??3q¯+3q+g process. The nonperturbative effects are incorporated by a simple quark model of baryons to evaluate the angular distribution parameters and decay widths for the processes J/??p¯N*, N¯*N*. From fitting the decay width of J/???pp¯ to the experimental data, we extract the quark-pair creation strength gI=15.40 GeV. Our numerical results for J/??p¯N*, N¯*N* decays show that the branching ratios for these decays are quite different if the Roper resonance is assumed to be a common 3q state or a pure hybrid state. For testing its mixing properties, we present a scheme to construct the Roper wave function by mixing |qqqg> state with a normal |qqq,2s> state. Under this picture, the ratios of the decay widths to that of the J/??pp¯ decay are re-evaluated versus the mixing parameter. A test of the hybrid nature of the Roper resonance in J/? decays is discussed.

Ping, R. G.; Chiang, H. C.; Zou, B. S.

2004-10-01

45

Evidence for light scalar resonances in charm meson decays from Fermilab E791  

SciTech Connect

From Dalitz-plot analyses of D{sup +} {yields} {pi}{sup -}{pi}{sup +}{pi}{sup +} and D{sup +} {yields} K{sup -}{pi}{sup +}{pi}{sup +} decays, we find evidence for light and broad scalar resonances {sigma}(500) and {kappa}(800). From a Dalitz-plot analysis of D{sub s}{sup +} {yields} {pi}{sup -}{pi}{sup +}{pi}{sup +} decays, they measure the masses and decay widths of the scalar resonances f{sub 0}(980) and f{sub 0}(1370).

Alan J. Schwartz

2003-01-24

46

Narrow Resonances in Light Heavy-Ion Collisions: Formation and Decay  

SciTech Connect

Resonances in light heavy-ion collisions have been observed in systems with a small number of open channels. Very narrow resonances have been reported in the {sup 24}Mg+{sup 24}Mg and {sup 12}C+{sup 12}C cases for which the results of recent experiments on their decay modes will be presented. Special emphasis will be given to the {sup 12}C+{sup 12}C reaction where weak absorption allows the observation of resonant and refractive effects over a large bombarding energy range. The nature of recently observed sub-coulomb resonances will also be raised.

Haas, F.; Courtin, S.; Lebhertz, D.; Salsac, M.-D. [IPHC-DRS, ULP, CNRS/IN2P3, 23 rue du Loess, 67037 Strasbourg Cedex 2 (France)

2009-03-04

47

Experimental evidence for a light and broad scalar resonance in D+ ? ???+?+ decay  

Microsoft Academic Search

From a sample of 1172 ± 61 D+ ? ???+?+ decay, we find ( D+ ? ???+?+)\\/( D+ ? K ??+?+) = 0.0311±0.0018+0.0016 ?0.0026. Using a coherent am- plitude analysis to fit the Dalitz plot of these decays, we find strong evidence that a scalar resonance of mass 478+24?23 ± 17 MeV\\/c 2 and width 324+42?40 ± 21 MeV\\/c2 accounts

E. M. Aitala; S. Amato; J. C. Anjos; J. A. Appel; D. Ashery; S. Banerjee; I. Bediaga; G. Blaylock; S. B. Bracker; R. A. Burnstein; T. Carter; H. S. Carvalho; N. K. Copty; L. M. Cremaldi; C. Darling; K. Denisenko; S. Devmal; A. Fernandez; G. F. Fox; P. Gagnon; C. Gobel; K. Gounder; A. M. Halling; G. Herrera; G. Hurvits; C. James; P. A. Kasper; S. Kwan; D. C. Langs; J. Leslie; B. Lundberg; J. Magnin; A. Massafferri; S. MayTal-Beck; B. Meadows; D. Mihalcea; R. H. Milburn; J. M. de Miranda; A. Napier; A. Nguyen; A. B. d'Oliveira; K. O'Shaughnessy; K. C. Peng; L. P. Perera; M. V. Purohit; B. Quinn; S. Radeztsky; A. Rafatian; N. W. Reay; J. J. Reidy; H. A. Rubin; D. A. Sanders; A. K. S. Santha; A. F. S. Santoro; A. J. Schwartz; M. Sheaff; R. A. Sidwell; A. J. Slaughter; M. D. Sokoloff; J. Solano; N. R. Stanton; R. J. Stefanski; K. Stenson; D. J. Summers; S. Takach; K. Thorne; A. K. Tripathi; S. Watanabe; J. Wiener; N. Witchey; E. Wolin; S. M. Yang; D. Yi; S. Yoshida; R. Zaliznyak; C. Zhang

48

Experimental Evidence for a Light and Broad Scalar Resonance in D+ --> pi-pi+pi+ Decay  

Microsoft Academic Search

From a sample of 1172+\\/-61 D+-->pi-pi+pi+ decays, we find gamma\\\\(D+-->pi- pi+pi+\\\\)\\/gamma\\\\(D+-->K-pi+pi+\\\\) = 0.0311+\\/-0.0018+0.0016-0.0026. Using a coherent amplitude analysis to fit the Dalitz plot of these decays, we find strong evidence that a scalar resonance of mass 478+24-23+\\/-17 MeV\\/c2 and width 324+42-40+\\/-21 MeV\\/c2 accounts for approximately half of all decays.

E. M. Aitala; S. Amato; J. C. Anjos; J. A. Appel; D. Ashery; S. Banerjee; I. Bediaga; G. Blaylock; S. B. Bracker; P. R. Burchat; R. A. Burnstein; T. Carter; H. S. Carvalho; N. K. Copty; L. M. Cremaldi; C. Darling; K. Denisenko; S. Devmal; A. Fernandez; G. F. Fox; P. Gagnon; C. Gobel; K. Gounder; A. M. Halling; G. Herrera; G. Hurvits; C. James; P. A. Kasper; S. Kwan; D. C. Langs; J. Leslie; B. Lundberg; J. Magnin; A. Massafferri; S. Maytal-Beck; B. Meadows; J. R. de Mello Neto; D. Mihalcea; R. H. Milburn; J. M. de Miranda; A. Napier; A. Nguyen; A. B. D'Oliveira; K. O'Shaughnessy; K. C. Peng; L. P. Perera; M. V. Purohit; B. Quinn; S. Radeztsky; A. Rafatian; N. W. Reay; J. J. Reidy; A. C. Dos Reis; H. A. Rubin; D. A. Sanders; A. K. Santha; A. F. Santoro; A. J. Schwartz; M. Sheaff; R. A. Sidwell; A. J. Slaughter; M. D. Sokoloff; J. Solano; N. R. Stanton; R. J. Stefanski; K. Stenson; D. J. Summers; S. Takach; K. Thorne; A. K. Tripathi; S. Watanabe; R. Weiss-Babai; J. Wiener; N. Witchey; E. Wolin; S. M. Yang; D. Yi; S. Yoshida; R. Zaliznyak; C. Zhang

2001-01-01

49

Decay pattern of the pygmy dipole resonance in 60Ni  

NASA Astrophysics Data System (ADS)

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.

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

50

Gamma decay of isovector giant resonances built on highly excited states in 111Sn  

Microsoft Academic Search

Gamma-ray transition-energy spectra up to Egamma~=33 MeV have been measured for the decay of the compound nucleus 111Sn* populated at excitation energies up to E*~=100 MeV. Above Egamma~=20 MeV an excess of gamma rays over the contribution from the isovector giant dipole resonance is observed in the energy range where the isovector giant quadrupole resonance built on excited states is

J. J. Gaardhøje; C. Ellegaard; B. Herskind; R. M. Diamond; M. A. Deleplanque; G. Dines; A. O. Macchiavelli; F. S. Stephens

1986-01-01

51

Effect of three-pion unitarity on resonance poles from heavy meson decays  

SciTech Connect

We study the final state interaction in 3{pi} decay of meson resonances at the Excited Baryon Analysis Center (EBAC) of JLab. We apply the dynamical coupled-channels formulation which has been extensively used by EBAC to extract N{sup *} information. The formulation satisfies the 3{pi} unitarity condition which has been missed in the existing works with the isobar models. We report the effect of the 3{pi} unitarity on the meson resonance pole positions and Dalitz plot.

Nakamura, Satoshi X. [Excited Baryon Analysis Center, Jefferson Laboratory, Newport News, Virginia 23606 (United States)

2011-10-21

52

Effect of three-pion unitarity on resonance poles from heavy meson decays  

SciTech Connect

We study the final state interaction in 3-pion decay of meson resonances at the Excited Baryon Analysis Center (EBAC) of JLab. We apply the dynamical coupled-channels formulation which has been extensively used by EBAC to extract N* information. The formulation satisfies the 3-pion unitarity condition which has been missed in the existing works with the isobar models. We report the effect of the 3-pion unitarity on the meson resonance pole positions and Dalitz plot.

Satoshi X. Nakamura

2011-10-01

53

Decay Times and Quality Factors for a Resonance Apparatus  

ERIC Educational Resources Information Center

|The commercial resonance demonstration apparatus shown in Fig. 1 exhibits curious behavior. It consists of three pairs of slender spring-steel rods attached to a horizontal bar. When one of the rods is pulled aside and released, the rod of corresponding length is excited into visible motion, but the other rods remain apparently stationary. This…

Stephens, Heather; Tam, Austin; Moloney, Michael

2011-01-01

54

A search for resonance decays to e-jet in ep collisions at HERA  

NASA Astrophysics Data System (ADS)

A search for narrow resonances which decay into e+jet(s) has been performed. The data samples used were 113 pb-1 of integrated luminosity of e+p collisions and 16 pb-1 of e- p collisions collected with the ZEUS detector at HERA. No evidence for a resonance was found, and limits on the hypothetical Yukawa coupling lambda were derived as a function of the resonance mass. Limits were also derived for leptoquarks predicted by the Buchmuller-Ruckl-Wyler model. The limits vary with the leptoquark type, but extend to masses of 290 GeV for lambda = 0.1.

Liu, Xiang

55

Decay of a J{pi}=36+ Resonance in the 24Mg + 24Mg Reaction  

SciTech Connect

The narrow ({gamma}=170 keV) and high spin (J{pi}=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 the 24Mg states selectively populated: the 2+ and 4+ members of the ground state band.

Salsac, M.-D.; Haas, F.; Courtin, S.; Beck, C.; Rousseau, M.; Zafra, A. Sanchez I. [IReS, Strasbourg (France); Algora, A.; Dombradi, Z. [Institute of Nuclear Research, Debrecen (Hungary); Beghini, S.; Farnea, E.; Lenzi, S.; Montagnoli, G.; Scarlassara, F. [University of Padova, Padova (Italy); INFN, Padova (Italy); Behera, B.R.; Corradi, L.; Fioretto, E.; Gadea, A.; Latina, A.; Marginean, N.; Napoli, D. [INFN, Laboratori Nazionali di Legnaro (Italy)] [and others

2005-11-21

56

Decay of a J?=36+ Resonance in the 24Mg + 24Mg Reaction  

NASA Astrophysics Data System (ADS)

The narrow (?=170 keV) and high spin (J?=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-? coincidence measurements performed ON and OFF resonance using the PRISMA-CLARA array, we have identified the 24Mg states selectively populated: the 2+ and 4+ members of the ground state band.

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

2005-11-01

57

Nature and decay of a J?=36+ resonance in the 24Mg + 24Mg reaction  

NASA Astrophysics Data System (ADS)

It has been proposed to associate the narrow (?=170 keV) and high spin (J?=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-? coincidence measurements performed ON and OFF resonance using the PRISMA-CLARA array, we have established that the 24Mg states selectively populated are the 2+ and 4+ members of the ground state band.

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

2006-08-01

58

E1 radiation decay of isobaric analog resonances  

Microsoft Academic Search

Within the framework of the shell-optical model a quantitative interpretation for partial E1 radiation widths of isobaric analog resonances (IAR) has been proposed for near-magic nuclei over a wide atomic mass range. Spin-flip transitions as well as non-spin-flip ones are considered. A dependence of polarization effects on the spin-isospin part of the quasiparticle effective interaction is cleared up for transitions

V. G. Guba; O. A. Rumyantsev; M. G. Urin

1988-01-01

59

Hadronic decays of the tau lepton into KK{pi} modes within Resonance Chiral Theory  

SciTech Connect

{tau} decays into hadrons have a twofold interest: On the one hand, they are a clean environment for studying the hadronization of the left-handed current of QCD, while, on the other side, provide relevant dynamical information of the resonances that mediate these processes. Within an effective field theory-like framework, namely Resonance Chiral Theory, we analyse the decays ot the {tau} into KK{pi} modes and compare the results with CLEO and BaBar data. In this way, we provide bounds on the couplings entering our Lagrangian and predict the corresponding spectral functions. As a main result -and contrary to the bulk of theoretical studies and experimental analyses- we find vector current dominance on these decays.

Roig, P. [Instituto de Fisica Corpuscular, IFIC, CSIC-Universitat de Valencia. Apt. de Correus 22085, E-46071 Valencia (Spain)

2007-11-19

60

Study of resonances in exclusive B decays to D¯(*)D(*)K  

NASA Astrophysics Data System (ADS)

We present a study of resonances in exclusive decays of B mesons to D¯(*)D(*)K. We report the observation of the decays B?D¯(*)Ds1+(2536) where the Ds1+(2536) is reconstructed in the D*0K+ and D*+KS0 decay channels. We report also the observation of the decays B??(3770)K where the ?(3770) decays to D¯0D0 and D-D+. In addition, we present the observation of an enhancement for the D¯*0D0 invariant mass in the decays B?D¯*0D0K, at a mass of (3875.1-0.5+0.7±0.5)MeV/c2 with a width of (3.0-1.4+1.9±0.9)MeV (the first errors are statistical and the second are systematic). Branching fractions and spin studies are shown for the three resonances. The results are based on 347fb-1 of data collected with the BABAR detector at the PEP-II B factory.

Aubert, B.; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prudent, X.; Tisserand, V.; Zghiche, A.; Tico, J. Garra; Grauges, E.; Lopez, L.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Sun, L.; Abrams, G. S.; Battaglia, M.; Brown, D. N.; Button-Shafer, J.; Cahn, R. N.; Groysman, Y.; Jacobsen, R. G.; Kadyk, J. A.; Kerth, L. T.; Kolomensky, Yu. G.; Kukartsev, G.; Pegna, D. Lopes; Lynch, G.; Mir, L. M.; Orimoto, T. J.; Osipenkov, I. L.; Ronan, M. T.; Tackmann, K.; Tanabe, T.; Wenzel, W. A.; Del Amo Sanchez, P.; Hawkes, C. M.; Watson, A. T.; Koch, H.; Schroeder, T.; Walker, D.; Asgeirsson, D. J.; Cuhadar-Donszelmann, T.; Fulsom, B. G.; Hearty, C.; Mattison, T. S.; McKenna, J. A.; Khan, A.; Saleem, M.; Teodorescu, L.; Blinov, V. E.; Bukin, A. D.; Druzhinin, V. P.; Golubev, V. B.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Bondioli, M.; Curry, S.; Eschrich, I.; Kirkby, D.; Lankford, A. J.; Lund, P.; Mandelkern, M.; Martin, E. C.; Stoker, D. P.; Abachi, S.; Buchanan, C.; Foulkes, S. D.; Gary, J. W.; Liu, F.; Long, O.; Shen, B. C.; Vitug, G. M.; Zhang, L.; Paar, H. P.; Rahatlou, S.; Sharma, V.; Berryhill, J. W.; Campagnari, C.; Cunha, A.; Dahmes, B.; Hong, T. M.; Kovalskyi, D.; Richman, J. D.; Beck, T. W.; Eisner, A. M.; Flacco, C. J.; Heusch, C. A.; Kroseberg, J.; Lockman, W. S.; Schalk, T.; Schumm, B. A.; Seiden, A.; Wilson, M. G.; Winstrom, L. O.; Chen, E.; Cheng, C. H.; Fang, F.; Hitlin, D. G.; Narsky, I.; Piatenko, T.; Porter, F. C.; Andreassen, R.; Mancinelli, G.; Meadows, B. T.; Mishra, K.; Sokoloff, M. D.; Blanc, F.; Bloom, P. C.; Chen, S.; Ford, W. T.; Hirschauer, J. F.; Kreisel, A.; Nagel, M.; Nauenberg, U.; Olivas, A.; Smith, J. G.; Ulmer, K. A.; Wagner, S. R.; Zhang, J.; Gabareen, A. M.; Soffer, A.; Toki, W. H.; Wilson, R. J.; Winklmeier, F.; Altenburg, D. D.; Feltresi, E.; Hauke, A.; Jasper, H.; Merkel, J.; Petzold, A.; Spaan, B.; Wacker, K.; Klose, V.; Kobel, M. J.; Lacker, H. M.; Mader, W. F.; Nogowski, R.; Schubert, J.; Schubert, K. R.; Schwierz, R.; Sundermann, J. E.; Volk, A.; Bernard, D.; Bonneaud, G. R.; Latour, E.; Lombardo, V.; Thiebaux, Ch.; Verderi, M.; Clark, P. J.; Gradl, W.; Muheim, F.; Playfer, S.; Robertson, A. I.; Watson, J. E.; Xie, Y.; Andreotti, M.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cecchi, A.; Cibinetto, G.; Franchini, P.; Luppi, E.; Negrini, M.; Petrella, A.; Piemontese, L.; Prencipe, E.; Santoro, V.; Anulli, F.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Pacetti, S.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Buzzo, A.; Contri, R.; Lo Vetere, M.; Macri, M. M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Santroni, A.; Tosi, S.; Chaisanguanthum, K. S.; Morii, M.; Wu, J.; Dubitzky, R. S.; Marks, J.; Schenk, S.; Uwer, U.; Bard, D. J.; Dauncey, P. D.; Flack, R. L.; Nash, J. A.; Vazquez, W. Panduro; Tibbetts, M.; Behera, P. K.; Chai, X.; Charles, M. J.; Mallik, U.; Cochran, J.; Crawley, H. B.; Dong, L.; Eyges, V.; Meyer, W. T.; Prell, S.; Rosenberg, E. I.; Rubin, A. E.; Gao, Y. Y.; Gritsan, A. V.; Guo, Z. J.; Lae, C. K.; Denig, A. G.; Fritsch, M.; Schott, G.; Arnaud, N.; Béquilleux, J.; D'Orazio, A.; Davier, M.; Grosdidier, G.; Höcker, A.; Lepeltier, V.; Le Diberder, F.; Lutz, A. M.; Pruvot, S.; Rodier, S.; Roudeau, P.; Schune, M. H.; Serrano, J.; Sordini, V.; Stocchi, A.; Wang, W. F.; Wormser, G.; Lange, D. J.; Wright, D. M.; Bingham, I.; Chavez, C. A.; Fry, J. R.; Gabathuler, E.; Gamet, R.; Hutchcroft, D. E.; Payne, D. J.; Schofield, K. C.; Touramanis, C.; Bevan, A. J.; George, K. A.; di Lodovico, F.; Sacco, R.; Cowan, G.; Flaecher, H. U.; Hopkins, D. A.; Paramesvaran, S.; Salvatore, F.; Wren, A. C.; Brown, D. N.; Davis, C. L.; Allison, J.; Bailey, D.; Barlow, N. R.; Barlow, R. J.; Chia, Y. M.; Edgar, C. L.; Lafferty, G. D.; West, T. J.; Yi, J. I.; Anderson, J.; Chen, C.; Jawahery, A.; Roberts, D. A.; Simi, G.; Tuggle, J. M.; Blaylock, G.; Dallapiccola, C.; Hertzbach, S. S.; Li, X.; Moore, T. B.; Salvati, E.; Saremi, S.; Cowan, R.; Dujmic, D.; Fisher, P. H.; Koeneke, K.; Sciolla, G.; Spitznagel, M.; Taylor, F.; Yamamoto, R. K.; Zhao, M.; Zheng, Y.; McLachlin, S. E.; Patel, P. M.; Robertson, S. H.; Lazzaro, A.; Palombo, F.; Bauer, J. M.; Cremaldi, L.; Eschenburg, V.; Godang, R.; Kroeger, R.; Sanders, D. A.; Summers, D. J.; Zhao, H. W.; Brunet, S.; Côté, D.; Simard, M.; Taras, P.; Viaud, F. B.; Nicholson, H.; de Nardo, G.; Fabozzi, F.; Lista, L.; Monorchio, D.; Sciacca, C.; Baak, M. A.; Raven, G.; Snoek, H. L.; Jessop, C. P.; Knoepfel, K. J.; Losecco, J. M.; Benelli, G.; Corwin, L. A.; Honscheid, K.; Kagan, H.; Kass, R.; Morris, J. P.; Rahimi, A. M.; Regensburger, J. J.; Sekula, S. J.; Wong, Q. K.; Blount, N. L.; Brau, J.; Frey, R.

2008-01-01

61

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

PubMed

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

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

2013-07-16

62

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

NASA Astrophysics Data System (ADS)

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.

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

2013-09-01

63

Statistical and nonstatistical neutron decay of the giant electric dipole resonance of sup 208 Pb  

Microsoft Academic Search

The neutron decay of the giant electric dipole resonance of ²°⁸Pb has been determined by a measurement of the differential cross section, {ital d}Ï({ital E}{sub γ},{ital E}{sub {ital n}})\\/{ital dE}{sub {ital n}} of the ²°⁸Pb(γ,{ital n}) reaction for 20 contiguous photon energy bands between 11.2 and 15.7 MeV. The statistical component of the decay was calculated in the Hauser-Feshbach formalism.

R. Alarcon; P. L. Cole; D. S. Dale; P. T. Debevec; L. J. Morford

1991-01-01

64

Production characteristics of K 0 and light meson resonances in hadronic decays of the Z 0  

Microsoft Academic Search

An analysis of inclusive production of K0 and the meson resonances K*±(892), ?0(770),f0(975) andf2(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±0.15?0(770) per hadronic Z0 decay. The average multiplicities off0(975)

P. Abreu; W. Adam; T. Adye; E. Agasi; I. Ajinenko; R. Aleksan; G. D. Alekseev; P. P. Allport; S. Almehed; F. M. L. Almeida; S. J. Alvsvaag; U. Amaldi; A. Andreazza; P. Antilogus; V. Anykeyev; W. D. Apel; R. J. Apsimon; Y. Arnoud; B. Asman; J. E. Augustin; A. Augustinus; P. Baillon; P. Bambade; F. Barao; R. Barate; G. Barbiellini; D. Y. Bardin; G. J. Barker; 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; P. Beltran; A. 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; C. Caso; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; L. Cerrito; V. Chabaud; A. Chan; M. Chapkin; Ph. Charpentier; L. Chaussard; J. Chauveau; P. Checchia; G. A. Chelkov; P. 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. Crennell; G. Crosetti; J. Cuevas Maestro; S. Czellar; E. Dahl-Jensen; J. Dahm; B. Dalmagne; M. Dam; G. Damgaard; E. Daubie; A. Daum; P. D. Dauncey; M. Davenport; J. Davies; W. Da Silva; C. Defoix; P. Delpierre; N. Demaria; A. De Angelis; H. De Boeck; W. 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. De Paula; C. De Saint-Jean; H. Dijkstra; L. Di Ciaccio; F. Djama; J. Dolbeau; M. Donszelmann; K. Doroba; M. Dracos; J. Drees; M. Dris; Y. Dufour; F. Dupont; D. Edsall; R. Ehret; T. Ekelof; G. Ekspong; M. Elsing; J.-P. Engel; N. Ershaidat; M. Espirito Santo; D. Fassouliotis; M. Feindt; A. Ferrer; T. A. Filippas; A. Firestone; H. Foeth; E. Fokitis; F. Fontanelli; F. Formenti; J. L. Fousset; B. Franek; P. Frenkiel; D. C. Fries; A. G. Frodesen; R. Fruhwirth; F. Fulda-Quenzer; H. Furstenau; J. 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; G. Gopal; L. Gorn; M. Gorski; V. 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. Henriques; J. J. Hernandez; J. A. Hernando; P. Herquet; H. Herr; T. L. Hessing; E. Higon; H. J. Hilke; T. S. Hill; S. O. Holmgren; P. J. Holt; D. Holthuizen; P. F. Honore; M. Houlden; J. 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. Jonsson; P. Juillot; M. Kaiser; G. Kalmus; F. Kapusta; M. Karlsson; E. Karvelas; S. Katsanevas; E. C. Katsoufis; R. Keranen; B. A. Khomenko; N. N. Khovanski; B. King; N. J. Kjaer; H. Klein; A. Kovning; P. 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; M. Krammer; C. Kreuter; J. Krolikowski; I. Kronkvist; W. Krupinski; W. Kucewicz; K. Kulka; K. Kurvinen; C. Lacasta; I. Laktineh; C. Lambropoulos; J. W. Lamsa; L. Lanceri; P. Langefeld; V. Lapin; I. Last; J. P. Laugier; R. Lauhakangas; G. Leder; F. Ledroit; R. Leitner; Y. Lemoigne; J. Lemonne; G. 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. Los; D. Loukas; J. J. Lozano; 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; G. 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; 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; S. Nemecek; W. Neumann; N. Neumeister; R. Nicolaidou; B. S. Nielsen; P. Niss; A. Nomerotski; A. Normand; M. Novak; V. Obraztsov; A. G. Olshevski; R. Orava; K. Osterberg; A. Ouraou; P. Paganini; M. Paganoni; R. Pain; H. Palka

1995-01-01

65

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

Microsoft Academic Search

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.

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

66

Determination of the decay channel of the 4d. -->. 4f resonance in Tm  

SciTech Connect

We have found that the shape of the potential for 4f electrons in Tm predicts quite well the character of the 4d..-->..4f autoionization resonance observed in the photoelectron spectra. The direct photoemission from the 4d shell is suppressed by a barrier in the potential. Tunneling through this barrier is significantly slower than the decay of the excited electron back into the 4d hole. This decay is thus the dominant channel and is observed to lead predominantly to autoionization of the 4f shell.

Egelhoff, W.F. Jr.; Tibbetts, G.G.; Hecht, M.H.; Lindau, I.

1981-04-20

67

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

Microsoft Academic Search

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 >

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

68

Resonant structure and flavour tagging in the B? ± system using fully reconstructed B decays  

Microsoft Academic Search

Starting from a sample of four million hadronic Z decays collected with the ALEPH detector at LEP, 404 charged and neutral B mesons are fully reconstructed and used to look for resonant structure in the B? system. An excess of events is observed above the expected background in the B? mass spectrum at a mass ?5.7 GeV\\/c2, consistent with the

R. Barate; Damir Buskulic; D. Decamp; P. Ghez; C. Goy; J.-P. Lees; A. Lucotte; E. Merle; M.-N. Minard; J.-Y. Nief; B. Pietrzyk; R. Alemany; G. Boix; M. P. Casado; M. Chmeissani; J. M. Crespo; M C Delfino; E. Fernandez; M. Fernandez-Bosman; Ll. Garrido; E Graugès-Pous; A. Juste; M. Martinez; G. Merino; R. Miquel; Ll. M. Mir; I. C. Park; A. Pascual; J. A. Perlas; I. Riu; F. Sanchez; A. Colaleo; D. Creanza; M. de Palma; G. Gelao; Giuseppe 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; U. Becker; P G Bright-Thomas; David William Casper; M. Cattaneo; V. Ciulli; G. Dissertori; H. Drevermann; Roger W Forty; M. Frank; R. Hagelberg; J. B. Hansen; J. Harvey; R. Jacobsen; P. Janot; B. Jost; Ivan Lehraus; P. Mato; Adolf G Minten; L. Moneta; A. Pacheco; J.-F. Pusztaszeri; F. Ranjard; Luigi Rolandi; D. Rousseau; D. Schlatter; M. Schmitt; O. Schneider; W. Tejessy; F. Teubert; I. R. Tomalin; H W Wachsmuth; A. Wagner; Ziad J Ajaltouni; F. Badaud; G. Chazelle; O. Deschamps; A. Falvard; C. Ferdi; P. Gay; C. Guicheney; P. Henrard; J. Jousset; B. Michel; S. Monteil; J. C. Montret; D. Pallin; P. Perret; F. Podlyski; J. Proriol; P. Rosnet; J. D. Hansen; P. H. Hansen; B. S. Nilsson; B. Rensch; A. Wäänänen; G. Daskalakis; A. Kyriakis; C. Markou; Errietta Simopoulou; I. Siotis; Anna Vayaki; A. Blondel; G R Bonneaud; J.-C. Brient; P. Bourdon; A. Rougé; M. Rumpf; Andrea Valassi; M. Verderi; H L Videau; E. Focardi; G. Parrini; K. Zachariadou; M. Corden; C H Georgiopoulos; D. E. Jaffe; A. Antonelli; G. Bencivenni; F. Bossi; P. Campana; G. Capon; F. Cerutti; V. Chiarella; G. Felici; P. Laurelli; G. Mannocchi; F. Murtas; G. P. Murtas; L. Passalacqua; M. Pepe-Altarelli; L. Curtis; A. W. Halley; J. G. Lynch; P. Negus; V. O'Shea; C. Raine; J. M. Scarr; K. Smith; P. Teixeira-Dias; A. S. Thompson; E. Thomson; O L Buchmüller; S. Dhamotharan; C. Geweniger; G. Graefe; P. Hanke; G. Hansper; V. Hepp; E. E. Kluge; A. Putzer; J. Sommer; K. Tittel; S. Werner; M. Wunsch; R. Beuselinck; David M Binnie; W. Cameron; Peter J Dornan; M. Girone; S M Goodsir; E. B. Martin; N. Marinelli; A. Moutoussi; J. Nash; J. K. Sedgbeer; P. Spagnolo; M. D. Williams; V. M. Ghete; P. Girtler; E. Kneringer; D. Kuhn; G. Rudolph; A. P. Betteridge; C. K. Bowdery; P. G. Buck; P. Colrain; G. Crawford; A. J. Finch; F. Foster; G. Hughes; R. W. L. Jones; M. I. Williams; I. Giehl; A. M. Greene; C. Hoffmann; K. Jakobs; K. Kleinknecht; G. Quast; B. Renk; E. Rohne; H.-G. Sander; P. van Gemmeren; C. Zeitnitz; Jean-Jacques Aubert; C. Benchouk; A. Bonissent; G. Bujosa; D. Calvet; J. Carr; P. Coyle; F. Etienne; O. Leroy; F. Motsch; P. Payre; M. Talby; A. Sadouki; M. Thulasidas; K. Trabelsi; M. Aleppo; M. Antonelli; F. Ragusa; R. Berlich; Walter Blum; V. Büscher; H. Dietl; G. Ganis; H. Kroha; G. Lütjens; C. Mannert; W. Männer; H.-G. Moser; S. Schael; Ronald Settles; H C J Seywerd; H. Seywerd; W. Wiedenmann; G. Wolf; J. Boucrot; O. Callot; S. Chen; A. Cordier; M. Davier; L. Duflot; J.-F. Grivaz; Ph. Heusse; A. Höcker; A. Jacholkowska; D. W. Kim; F R Le Diberder; J. Lefrançois; A.-M. Lutz; M.-H. Schune; E. Tournefier; J.-J. Veillet; I. Videau; D. Zerwas; P. Azzurri; G. Bagliesi; G. Batignani; S. Bettarini; T. Boccali; C. Bozzi; G. Calderini; M. Carpinelli; M. Carpinelli; R. Dell'Orso; R. Fantechi; I. Ferrante; L. Foà; F. Forti; A. Giassi; M. A. Giorgi; M. A. Giorgi; F. Ligabue; A. Lusiani; P. S. Marrocchesi; A. Messineo; Fabrizio Palla; G. Rizzo; G. Sanguinetti; A. Sciabà; Roberto Tenchini; G. Tonelli; C. Vannini; A. Venturi; P. G. Verdini; G. A. Blair; L. M. Bryant; J. T. Chambers; M. G. Green; T. Medcalf; P. Perrodo; J. A. Strong; J. H. von Wimmersperg-Toeller; David R Botterill; R. W. Clifft; T. R. Edgecock; S. Haywood; P. R. Norton; J. C. Thompson; A. E. Wright; B. Bloch-Devaux; P. Colas; S. Emery; Witold Kozanecki; E. Lançon; M.-C. Lemaire; E. Locci; P. Perez; J. Rander; J.-F. Renardy; A. Roussarie; J.-P. Schuller; J. Schwindling; A. Trabelsi; B. Vallage; S. N. Black; J. H. Dann; R. P. Johnson; H. Y. Kim; N P Konstantinidis; A. M. Litke; M. A. McNeil; G. Taylor; C. N. Booth; C. A. J. Brew; S L Cartwright; F. Combley; M. S. Kelly; M H Lehto; J. Reeve; L. F. Thompson; K. Affholderbach; A. Böhrer; S. Brandt; G D Cowan; Claus Grupen; P. Saraiva; L. Smolik; F. Stephan; M. Apollonio; L. Bosisio; R. Della Marina; G. Giannini; B. Gobbo; G. Musolino; J E Rothberg; S R Wasserbaech; S. R. Armstrong; E. Charles; P. Elmer; D. P. S. Ferguson; Y. Gao; S. González; T. C. Greening; O. J. Hayes; H. Hu; S. Jin; P. A. McNamara III; J. M. Nachtman; J. Nielsen; W. Orejudos; Y. B. Pan; Y. Saadi; I. J. Scott; J. Walsh; Sau Lan Wu; X. Wu; G. Zobernig

1998-01-01

69

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

SciTech Connect

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.

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

70

Structure and three-body decay of {sup 9}Be resonances  

SciTech Connect

The complex-rotated hyperspherical adiabatic method is used to study the decay of low-lying {sup 9}Be resonances into one neutron and two {alpha} particles. We investigate the six resonances above the breakup threshold and below 6 MeV: 1/2{sup {+-},} 3/2{sup {+-},} and 5/2{sup {+-}.} The short-distance properties of each resonance are studied, and the different angular momentum and parity configurations of the {sup 8}Be and {sup 5}He two-body substructures are determined. We compute the branching ratio for sequential decay via the {sup 8}Be ground state, which qualitatively is consistent with measurements. We extract the momentum distributions after decay directly into the three-body continuum from the large-distance asymptotic structures. The kinematically complete results are presented as Dalitz plots as well as projections on given neutron and {alpha} energy. The distributions are discussed and, in most cases, found to agree with available experimental data.

Alvarez-Rodriguez, R. [Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark); Grupo de Fisica Nuclear, Departamento de Fisica Atomica, Molecular y Nuclear, Universidad Complutense de Madrid, E-28040 Madrid (Spain); Jensen, A. S.; Fedorov, D. V. [Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark); Garrido, E. [Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, Serrano 123, E-28006 Madrid (Spain)

2010-09-15

71

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

SciTech Connect

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.

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

1988-01-01

72

Coherent control of radiationless transitions: simultaneous excitation and decay of overlapping resonances.  

PubMed

We develop a simple analytical theory for the study of coherent control of radiationless transitions, and in particular, internal conversion leading to dissociation, in molecules possessing overlapping resonances. The method is applied to a model diatomic system. In contrast to previous studies, we consider here the control of a molecule that is allowed to decay during and after the preparation process. We use this theory to derive the shape of the laser pulse that creates the specific excited wave packet that best enhances or suppresses the radiationless transitions process. The results show the importance of resonance overlap in the molecule in order to achieve efficient coherent control over radiationless transitions via laser excitation. Specifically, resonance overlap is proven to be crucial in order to alter interference contributions to the controlled observable, and hence to achieve efficient coherent control by varying the phase of the laser field. PMID:23387583

Grinev, Timur; Shapiro, Moshe; Brumer, Paul

2013-01-28

73

Observation of Two New N* Resonances in the Decay ?(3686)?pp¯?0  

NASA Astrophysics Data System (ADS)

Based on 106×106?(3686) events collected with the BESIII detector at the BEPCII facility, a partial wave analysis of ?(3686)?pp¯?0 is performed. The branching fraction of this channel has been determined to be B(?(3686)?pp¯?0)=(1.65±0.03±0.15)×10-4. In this decay, 7 N* intermediate resonances are observed. Among these, two new resonances, N(2300) and N(2570) are significant, one 1/2+ resonance with a mass of 2300-30-0+40+109MeV/c2 and width of 340-30-58+30+110MeV/c2, and one 5/2- resonance with a mass of 2570-10-10+19+34MeV/c2 and width of 250-24-21+14+69MeV/c2. For the remaining 5 N* intermediate resonances [N(1440), N(1520), N(1535), N(1650) and N(1720)], the analysis yields mass and width values that are consistent with those from established resonances.

Ablikim, M.; Achasov, M. N.; Ambrose, D. J.; An, F. F.; An, Q.; An, Z. H.; Bai, J. Z.; Ban, Y.; Becker, J.; Berger, N.; Bertani, M.; Bian, J. M.; Boger, E.; Bondarenko, O.; Boyko, I.; Briere, R. A.; Bytev, V.; Cai, X.; Calcaterra, A.; Cao, G. F.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, S. J.; Chen, Y.; Chen, Y. B.; Cheng, H. P.; Chu, Y. P.; Cronin-Hennessy, D.; Dai, H. L.; Dai, J. P.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; Ding, W. M.; Ding, Y.; Dong, L. Y.; Dong, M. Y.; Du, S. X.; Fang, J.; Fang, S. S.; Fava, L.; Feldbauer, F.; Feng, C. Q.; Ferroli, R. B.; Fu, C. D.; Fu, J. L.; Gao, Y.; Geng, C.; Goetzen, K.; Gong, W. X.; Gradl, W.; Greco, M.; Gu, M. H.; Gu, Y. T.; Guan, Y. H.; Guo, A. Q.; Guo, L. B.; Guo, Y. P.; Han, Y. L.; Hao, X. Q.; Harris, F. A.; He, K. L.; He, M.; He, Z. Y.; Held, T.; Heng, Y. K.; Hou, Z. L.; Hu, H. M.; Hu, J. F.; Hu, T.; Huang, B.; Huang, G. M.; Huang, J. S.; Huang, X. T.; Huang, Y. P.; Hussain, T.; Ji, C. S.; Ji, Q.; Ji, X. B.; Ji, X. L.; Jia, L. K.; Jiang, L. L.; Jiang, X. S.; Jiao, J. B.; Jiao, Z.; Jin, D. P.; Jin, S.; Jing, F. F.; Kalantar-Nayestanaki, N.; Kavatsyuk, M.; Kühn, W.; Lai, W.; Lange, J. S.; Leung, J. K. C.; Li, C. H.; Li, Cheng; Li, Cui; Li, D. M.; Li, F.; Li, G.; Li, H. B.; Li, J. C.; Li, K.; Li, Lei; Li, N. B.; Li, Q. J.; Li, S. L.; Li, W. D.; Li, W. G.; Li, X. L.; Li, X. N.; Li, X. Q.; Li, X. R.; Li, Z. B.; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Liao, X. T.; Liu, B. J.; Liu, B. J.; Liu, C. L.; Liu, C. X.; Liu, C. Y.; Liu, F. H.; Liu, Fang; Liu, Feng; Liu, H.; Liu, H. B.; Liu, H. H.; Liu, H. M.; Liu, H. W.; Liu, J. P.; Liu, K. Y.; Liu, Kai; Liu, Kun; Liu, P. L.; Liu, S. B.; Liu, X.; Liu, X. H.; Liu, Y.; Liu, Y. B.; Liu, Z. A.; Liu, Zhiqiang; Liu, Zhiqing; Loehner, H.; Lu, G. R.; Lu, H. J.; Lu, J. G.; Lu, Q. W.; Lu, X. R.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, T.; Luo, X. L.; Lv, M.; Ma, C. L.; Ma, F. C.; Ma, H. L.; Ma, Q. M.; Ma, S.; Ma, T.; Ma, X. Y.; Ma, Y.; Maas, F. E.; Maggiora, M.; Malik, Q. A.; Mao, H.; Mao, Y. J.; Mao, Z. P.; Messchendorp, J. G.; Min, J.; Min, T. J.; Mitchell, R. E.; Mo, X. H.; Morales Morales, C.; Motzko, C.; Muchnoi, N. Yu.; Nefedov, Y.; Nicholson, C.; Nikolaev, I. B.; Ning, Z.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Park, J. W.; Pelizaeus, M.; Peters, K.; Ping, J. L.; Ping, R. G.; Poling, R.; Prencipe, E.; Pun, C. S. J.; Qi, M.; Qian, S.; Qiao, C. F.; Qin, X. S.; Qin, Y.; Qin, Z. H.; Qiu, J. F.; Rashid, K. H.; Rong, G.; Ruan, X. D.; Sarantsev, A.; Schulze, J.; Shao, M.; Shen, C. P.; Shen, X. Y.; Sheng, H. Y.; Shepherd, M. R.; Song, X. Y.; Spataro, S.; Spruck, B.; Sun, D. H.; Sun, G. X.; Sun, J. F.; Sun, S. S.; Sun, X. D.; Sun, Y. J.; Sun, Y. Z.; Sun, Z. J.; Sun, Z. T.; Tang, C. J.; Tang, X.; Thorndike, E. H.; Tian, H. L.; Toth, D.; Ullrich, M.; Varner, G. S.; Wang, B.; Wang, B. Q.; Wang, J. X.; Wang, K.; Wang, L. L.; Wang, L. S.; Wang, M.; Wang, P.; Wang, P. L.; Wang, Q.; Wang, Q. J.; Wang, S. G.; Wang, X. F.; Wang, X. L.; Wang, Y. D.; Wang, Y. F.; Wang, Y. Q.; Wang, Z.; Wang, Z. G.; Wang, Z. Y.; Wei, D. H.; Weidenkaff, P.; Wen, Q. G.; Wen, S. P.; Werner, M.; Wiedner, U.; Wu, L. H.; Wu, N.; Wu, S. X.; Wu, W.; Wu, Z.; Xia, L. G.; Xiao, Z. J.; Xie, Y. G.; Xiu, Q. L.; Xu, G. F.; Xu, G. M.; Xu, H.; Xu, Q. J.; Xu, X. P.; Xu, Y.; Xu, Z. R.; Xue, F.; Xue, Z.; Yan, L.; Yan, W. B.; Yan, Y. H.; Yang, H. X.; Yang, T.; Yang, Y.; Yang, Y. X.; Ye, H.; Ye, M.; Ye, M. H.; Yu, B. X.; Yu, C. X.; Yu, J. S.; Yu, S. P.; Yuan, C. Z.; Yuan, W. L.; Yuan, Y.; Zafar, A. A.; Zallo, A.; Zeng, Y.; Zhang, B. X.; Zhang, B. Y.; Zhang, C. C.; Zhang, D. H.; Zhang, H. H.; Zhang, H. Y.; Zhang, J.; Zhang, J. G.; Zhang, J. Q.; Zhang, J. W.; Zhang, J. Y.; Zhang, J. Z.; Zhang, L.; Zhang, S. H.; Zhang, T. R.; Zhang, X. J.; Zhang, X. Y.; Zhang, Y.; Zhang, Y. H.; Zhang, Y. S.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, G.; Zhao, H. S.; Zhao, J. W.; Zhao, K. X.; Zhao, Lei; Zhao, Ling; Zhao, M. G.; Zhao, Q.; Zhao, S. J.; Zhao, T. C.; Zhao, X. H.; Zhao, Y. B.; Zhao, Z. G.; Zhemchugov, A.; Zheng, B.; Zheng, J. P.; Zheng, Y. H.; Zheng, Z. P.; Zhong, B.; Zhong, J.; Zhou, L.; Zhou, X. K.; Zhou, X. R.; Zhu, C.; Zhu, K.; Zhu, K. J.; Zhu, S. H.; Zhu, X. L.; Zhu, X. W.; Zhu, Y. M.; Zhu, Y. S.; Zhu, Z. A.; Zhuang, J.; Zou, B. S.; Zou, J. H.; Zuo, J. X.

2013-01-01

74

Search in leptonic channels for heavy resonances decaying to long-lived neutral particles  

NASA Astrophysics Data System (ADS)

A search is performed for heavy resonances decaying to two long-lived massive neutral particles, each decaying to leptons. The experimental signature is a distinctive topology consisting of a pair of oppositely charged leptons originating at a separated secondary vertex. Events were collected by the CMS detector at the LHC during pp collisions at sqrt{s}=7 TeV, and selected from data samples corresponding to 4.1 (5.1) fb-1 of integrated luminosity in the electron (muon) channel. No significant excess is observed above standard model expectations, and an upper limit is set with 95% confidence level on the production cross section times the branching fraction to leptons, as a function of the long-lived massive neutral particle lifetime.[Figure not available: see fulltext.

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, M.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Aldá, 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.; Heracleous, N.

2013-02-01

75

Hadronic decays of the tau lepton : {tau}- {yields} ({pi}{pi}{pi})- {nu}{tau} within Resonance Chiral Theory  

SciTech Connect

{tau} decays into hadrons foresee the study of the hadronization of vector and axial-vector QCD currents, yielding relevant information on the dynamics of the resonances entering into the processes. We analyse {tau} {yields} {pi}{pi}{pi}{nu}{tau} decays within the framework of the Resonance Chiral Theory, comparing this theoretical scheme with the experimental data, namely ALEPH spectral function and branching ratio. Hence we get values for the mass and on-shell width of the a 1 (1260) resonance, and provide the structure functions that have been measured by OPAL and CLEO-II.

Gomez Dumm, D. [IFLP, CONICET - Depto. de Fisica, Univ. Nac. de la Plata, C.C. 67, 1900 La Plata (Argentina); Pich, A.; Portoles, J. [Instituto de Fisica Corpuscular, IFIC, CSIC-Universitat de Valencia, Edifici d'Instituts de Paterna, Apt. Correus 22085, E-46071 Valencia (Spain)

2006-01-12

76

Hyperon AND Hyperon Resonance Properties From Charm Baryon Decays At BaBar  

SciTech Connect

This report describes studies of hyperons and hyperon resonances produced in charm baryon decays at BABAR. Using two-body decays of the {Xi}{sub c}{sup 0} and {Omega}{sub c}{sup 0}, it is shown, for the first time, that the spin of the {omega}{sup -} is 3/2. The {Omega}{sup -} analysis procedures are extended to three-body final states and properties of the {Xi}(1690){sup 0} are extracted from a detailed isobar model analysis of the {Lambda}{sub c}{sup +} {yields} {Lambda}{bar K}{sup 0}K{sup +} Dalitz plot. The mass and width values of the {Xi}(1690){sup 0} are measured with much greater precision than attained previously. The hypothesis that the spin of the {Xi}(1690) resonance is 1/2 yields an excellent description of the data, while spin values 3/2 and 5/2 are disfavored. The {Lambda}a{sub 0}(980){sup +} decay mode of the {Lambda}{sub c}{sup +} is observed for the first time. Similar techniques are then used to study {Xi}(1530){sup 0} production in {Lambda}{sub c}{sup +} decay. The spin of the {Xi}(1530) is established for the first time to be 3/2. The existence of an S-wave amplitude in the {Xi}{sup -}{pi}{sup +} system is shown, and its interference with the {Xi}(1530){sup 0} amplitude provides the first clear demonstration of the Breit-Wigner phase motion expected for the {Xi}(1530). The {Xi}{sup -}{pi}{sup +} mass distribution in the vicinity of the {Xi}(1690){sup 0} exhibits interesting structure which may be interpreted as indicating that the {Xi}(1690) has negative parity.

Ziegler, Veronique; /Iowa U.

2007-07-03

77

Neutral decay of double-holed doubly excited resonances of N2  

NASA Astrophysics Data System (ADS)

The neutral decay of doubly excited resonances (DER's) of N2 has been observed by measuring the excitation spectrum of vacuum ultraviolet fluorescence emitted from photodissociation fragments in the 20-38-eV region. A number of DER's with the [(1?u)-1(3?g)-1(?g)1:C 2?+u]ns?g Rydberg series (n=3-10) have been revealed. Rydberg progressions onto the N+2(D 2?g) state have also been observed. Strongly dissociative DER's correlating with satellites have been shown as broad peaks in the 23-33-eV region, which have appeared to have a correlation with the single-holed (X 2?+g)?u shape resonance.

Ukai, Masatoshi; Kameta, Kosei; Kouchi, Noriyuki; Hatano, Yoshihiko; Tanaka, Kenichiro

1992-12-01

78

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

NASA Astrophysics Data System (ADS)

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.

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

79

Resonant Auger Decay of Molecules in Intense X-Ray Laser Fields: Light-Induced Strong Nonadiabatic Effects  

SciTech Connect

The resonant Auger process is studied in intense x-ray laser fields. It is shown that the dressing of the initial and decaying states by the field leads to coupled complex potential surfaces which, even for diatomic molecules, possess intersections at which the nonadiabatic couplings are singular. HCl is studied as an explicit showcase example. The exact results differ qualitatively from those without rotations. A wealth of nonadiabatic phenomena is expected in decay processes in intense x-ray fields.

Cederbaum, Lorenz S.; Chiang, Ying-Chih; Demekhin, Philipp V. [Theoretische Chemie, Universitaet Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg (Germany); Moiseyev, Nimrod [Schulich Faculty of Chemistry and Minerva Center, Technion--Israel Institute of Technology, Haifa 32000 (Israel)

2011-03-25

80

Complete next-to-leading order QCD description of resonant Z' production and decay into tt¯ final states  

NASA Astrophysics Data System (ADS)

We discuss QCD radiative corrections to the production of a heavy neutral resonance Z' at the LHC assuming that it decays into a tt¯ final state. Compared to previous studies, our computation includes top quark decays as well as interference between the Z' signal process and the QCD tt¯ background. The interference contribution appears for the first time at next-to-leading order QCD and requires new one-loop amplitudes that are not present when signal and background are treated separately. We describe some examples of how QCD radiative corrections may influence both the exclusion limits and studies of properties of the new resonance, once it is discovered.

Caola, Fabrizio; Melnikov, Kirill; Schulze, Markus

2013-02-01

81

Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in pp Collisions with ATLAS at ?s = 7 TeV  

NASA Astrophysics Data System (ADS)

A search for a new top quark pair resonance at the CERN Large Hadron Collider with the ATLAS detector is performed on 4.66 fb-1 of data collected at ?s = 7 TeV. The search uses a new method for tagging jets that correspond to highly energetic top quark decays that tests the agreement of calorimetric energy depositions with the three-prong top quark decay hypothesis. The top quark plays an important role in many theories of physics beyond the Standard Model which often predict the existence of a new massive boson that couples dominantly to top quarks. The search reveals no evidence of a new top quark pair resonance, and the result is used to exclude Kaluza-Klein gluons as predicted by the Randall-Sundrum model with masses between 1.02 and 1.62 TeV, and to set cross-section limits on the leptophobic Z' boson.

Swedish, Stephen

2012-10-01

82

Resonant Auger decay of the core-excited C{sup *}O molecule in intense x-ray laser fields  

SciTech Connect

The dynamics of the resonant Auger (RA) process of the core-excited C*O(1s{sup -1}{pi}*,v{sub r}=0) molecule in an intense x-ray laser field is studied theoretically. The theoretical approach includes the analog of the conical intersections of the complex potential energy surfaces of the ground and 'dressed' resonant states due to intense x-ray pulses, taking into account the decay of the resonance and the direct photoionization of the ground state, both populating the same final ionic states coherently, as well as the direct photoionization of the resonance state itself. The light-induced nonadiabatic effect of the analog of the conical intersections of the resulting complex potential energy surfaces gives rise to strong coupling between the electronic, vibrational, and rotational degrees of freedom of the diatomic CO molecule. The interplay of the direct photoionization of the ground state and of the decay of the resonance increases dramatically with the field intensity. The coherent population of a final ionic state via both the direct photoionization and the resonant Auger decay channels induces strong interference effects with distinct patterns in the RA electron spectra. The individual impact of these physical processes on the total electron yield and on the CO{sup +}(A {sup 2}{Pi}) electron spectrum are demonstrated.

Demekhin, Philipp V.; Chiang, Ying-Chih; Cederbaum, Lorenz S. [Theoretische Chemie, Physikalisch-Chemisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

2011-09-15

83

Cascade ? decay study of 108Ag following thermal and resonance neutron capture in 107Ag  

NASA Astrophysics Data System (ADS)

With the aim to obtain information on the E1 and M1 photon strength functions at ?-ray energies below the neutron separation energy, we studied two-step ? cascades following the capture of thermal neutrons in 107Ag. For this purpose, we undertook an experiment with the dedicated facility for two-step ? cascades at the ?ež research reactor. The obtained data were discussed in conjunction with previous results from resonance neutron capture measurements with the same isotope, obtained at the GELINA facility of the Institute for Reference Materials and Measurements. The cascade ? decay of the 108Ag compound nucleus has been simulated with the aid of the Monte Carlo algorithm DICEBOX assuming several models for photon strength functions. To interpret the results of the experiments, the outcome from these simulations was confronted with the observed cascade-related quantities. The results indicate that the E1 photon strength function below the neutron binding energy is suppressed with respect to the conventional Brink-Axel model and that the M1 and/or possibly E2 photon strengths may play an important role in the decay of compound nucleus at excitations below ?3 MeV.

Zanini, L.; Corvi, F.; Postma, H.; Be?vá?, F.; Krti?ka, M.; Honzátko, J.; Tomandl, I.

2003-07-01

84

Resonant structure and flavour tagging in the B?+/- system using fully reconstructed B decays  

NASA Astrophysics Data System (ADS)

Starting from a sample of four million hadronic Z decays collected with the ALEPH detector at LEP, 404 charged and neutral B mesons are fully reconstructed and used to look for resonant structure in the B? system. An excess of events is observed above the expected background in the B? mass spectrum at a mass ~5.7 GeV/c2, consistent with the production and decay to B(*)? of the B** states predicted by Heavy Quark Symmetry (HQS). In the framework of HQS, it is found that the mass of the B2* state is (5739+ 8-11(stat)+6-4(syst)) MeV/c2 and the relative production rate of the B** system is BR(b-->B**-->B(*)?)/BR(b-- >Bu,d)=(31+/-9(stat)+6-5(syst))%. In the same sample of B mesons, significant B?+/- charge-flavour correlations are observed, which may prove important for tagging the initial B state in future CP violation studies.

ALEPH Collaboration; Barate, R.; Buskulic, D.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J.-P.; Lucotte, A.; Merle, E.; Minard, M.-N.; Nief, J.-Y.; Pietrzyk, B.; Alemany, R.; Boix, G.; Casado, M. P.; Chmeissani, M.; Crespo, J. M.; Delfino, M.; Fernandez, E.; Fernandez-Bosman, M.; Garrido, Ll.; Graugès, E.; Juste, A.; Martinez, M.; Merino, G.; Miquel, R.; Mir, Ll. M.; Park, I. C.; Pascual, A.; Perlas, J. A.; Riu, I.; Sanchez, F.; Colaleo, A.; Creanza, D.; de Palma, M.; Gelao, G.; Iaselli, G.; Maggi, G.; Maggi, M.; Nuzzo, S.; Ranieri, A.; Raso, G.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Tricomi, A.; Zito, G.; Huang, X.; Lin, J.; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Abbaneo, D.; Becker, U.; Bright-Thomas, P.; Casper, D.; Cattaneo, M.; Ciulli, V.; Dissertori, G.; Drevermann, H.; Forty, R. W.; Frank, M.; Hagelberg, R.; Hansen, J. B.; Harvey, J.; Jacobsen, R.; Janot, P.; Jost, B.; Lehraus, I.; Mato, P.; Minten, A.; Moneta, L.; Pacheco, A.; Pusztaszeri, J.-F.; Ranjard, F.; Rolandi, L.; Rousseau, D.; Schlatter, D.; Schmitt, M.; Schneider, O.; Tejessy, W.; Teubert, F.; Tomalin, I. R.; Wachsmuth, H.; Wagner, A.; Ajaltouni, Z.; Badaud, F.; Chazelle, G.; Deschamps, O.; Falvard, A.; Ferdi, C.; Gay, P.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Monteil, S.; Montret, J.-C.; Pallin, D.; Perret, P.; Podlyski, F.; Proriol, J.; Rosnet, P.; Hansen, J. D.; Hansen, J. R.; Hansen, P. H.; Nilsson, B. S.; Rensch, B.; Wäänänen, A.; Daskalakis, G.; Kyriakis, A.; Markou, C.; Simopoulou, E.; Siotis, I.; Vayaki, A.; Blondel, A.; Bonneaud, G.; Brient, J.-C.; Bourdon, P.; Rougé, A.; Rumpf, M.; Valassi, A.; Verderi, M.; Videau, H.; Focardi, E.; Parrini, G.; Zachariadou, K.; Corden, M.; Georgiopoulos, C.; Jaffe, D. E.; Antonelli, A.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Cerutti, F.; Chiarella, V.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, G. P.; Passalacqua, L.; Pepe-Altarelli, M.; Curtis, L.; Halley, A. W.; Lynch, J. G.; Negus, P.; O'Shea, V.; Raine, C.; Scarr, J. M.; Smith, K.; Teixeira-Dias, P.; Thompson, A. S.; Thomson, E.; Buchmüller, O.; Dhamotharan, S.; Geweniger, C.; Graefe, G.; Hanke, P.; Hansper, G.; Hepp, V.; Kluge, E. E.; Putzer, A.; Sommer, J.; Tittel, K.; Werner, S.; Wunsch, M.; Beuselinck, R.; Binnie, D. M.; Cameron, W.; Dornan, P. J.; Girone, M.; Goodsir, S.; Martin, E. B.; Marinelli, N.; Moutoussi, A.; Nash, J.; Sedgbeer, J. K.; Spagnolo, P.; Williams, M. D.; Ghete, V. M.; Girtler, P.; Kneringer, E.; Kuhn, D.; Rudolph, G.; Betteridge, A. P.; Bowdery, C. K.; Buck, P. G.; Colrain, P.; Crawford, G.; Finch, A. J.; Foster, F.; Hughes, G.; Jones, R. W. L.; Williams, M. I.; Giehl, I.; Greene, A. M.; Hoffmann, C.; Jakobs, K.; Kleinknecht, K.; Quast, G.; Renk, B.; Rohne, E.; Sander, H.-G.; van Gemmeren, P.; Zeitnitz, C.; Aubert, J. J.; Benchouk, C.; Bonissent, A.; Bujosa, G.; Calvet, D.; Carr, J.; Coyle, P.; Etienne, F.; Leroy, O.; Motsch, F.; Payre, P.; Talby, M.; Sadouki, A.; Thulasidas, M.; Trabelsi, K.; Aleppo, M.; Antonelli, M.; Ragusa, F.; Berlich, R.; Blum, W.; Büscher, V.; Dietl, H.; Ganis, G.; Kroha, H.; Lütjens, G.; Mannert, C.; Männer, W.; Moser, H.-G.; Schael, S.; Settles, R.; Seywerd, H.; Stenzel, H.; Wiedenmann, W.; Wolf, G.; Boucrot, J.; Callot, O.; Chen, S.; Cordier, A.; Davier, M.; Duflot, L.; Grivaz, J.-F.; Heusse, Ph.; Höcker, A.; Jacholkowska, A.; Kim, D. W.; Le Diberder, F.; Lefrançois, J.; Lutz, A.-M.; Schune, M.-H.; Tournefier, E.; Veillet, J.-J.; Videau, I.; Zerwas, D.; Azzurri, P.; Bagliesi, G.; Batignani, G.; Bettarini, S.; Boccali, T.; Bozzi, C.; Calderini, G.; Carpinelli, M.; Ciocci, M. A.; dell'Orso, R.; Fantechi, R.; Ferrante, I.; Foà, L.; Forti, F.; Giassi, A.; Giorgi, M. A.; Gregorio, A.; Ligabue, F.; Lusiani, A.; Marrocchesi, P. S.; Messineo, A.; Palla, F.; Rizzo, G.; Sanguinetti, G.; Sciabà, A.; Tenchini, R.; Tonelli, G.; Vannini, C.; Venturi, A.; Verdini, P. G.; Blair, G. A.; Bryant, L. M.; Chambers, J. T.; Green, M. G.; Medcalf, T.; Perrodo, P.; Strong, J. A.; von Wimmersperg-Toeller, J. H.; Botterill, D. R.; Clifft, R. W.; Edgecock, T. R.; Haywood, S.; Norton, P. R.; Thompson, J. C.; Wright, A. E.; Bloch-Devaux, B.; Colas, P.; Emery, S.; Kozanecki, W.; Lançon, E.; Lemaire, M.-C.; Locci, E.; Perez, P.; Rander, J.; Renardy, J.-F.; Roussarie, A.; Schuller, J.-P.; Schwindling, J.; Trabelsi, A.; Vallage, B.; Black, S. N.; Dann, J. H.; Johnson, R. P.; Kim, H. Y.; Konstantinidis, N.; Litke, A. M.; McNeil, M. A.; Taylor, G.; Booth, C. N.; Brew, C. A. J.; Cartwright, S.; Combley, F.; Kelly, M. S.; Lehto, M.; Reeve, J.; Thompson, L. F.; Affholderbach, K.; Böhrer, A.; Brandt, S.; Cowan, G.; Grupen, C.; Saraiva, P.; Smolik, L.; Stephan, F.; Apollonio, M.; Bosisio, L.; della Marina, R.

1998-04-01

85

Nature and decay of a J{pi}=36+ resonance in the 24Mg + 24Mg reaction  

SciTech Connect

It has been proposed to associate the narrow ({gamma}=170 keV) and high spin (J{pi}=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, we have established that the 24Mg states selectively populated are the 2+ and 4+ members of the ground state band.

Salsac, M.-D.; Haas, F.; Courtin, S.; Beck, C.; Rousseau, M.; Zafra, A. Sanchez I. [IPHC, Strasbourg (France); Algora, A.; Dombradi, Z. [Institute of Nuclear Research, Debrecen (Hungary); Beghini, S.; Farnea, E.; Lenzi, S.; Montagnoli, G.; Scarlassara, F. [University of Padova, Padova (Italy); INFN, Padova (Italy); Behera, B. R.; Corradi, L.; Fioretto, E.; Gadea, A.; Latina, A.; Marginean, N.; Napoli, D. [INFN, Laboratori Nazionali di Legnaro (Italy)] (and others)

2006-08-14

86

Search for resonant production of tt¯ decaying to jets in pp¯ collisions at s=1.96TeV  

NASA Astrophysics Data System (ADS)

This paper reports a search for nonstandard model topquark resonances, Z', decaying to tt¯?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 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 2.8fb-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 ?Z'=0.012MZ'. Within this model, we exclude a Z' boson with masses below 805GeV/c2 at the 95% confidence level.

Aaltonen, T.; Álvarez 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.; 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.; 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.; Clarke, C.; 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.; 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.; 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.; Kasmi, A.; 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.; Lecompte, T.; Lee, E.; Lee, H. S.; Lee, J. S.; Lee, S. W.; Leo, S.; Leone, S.; Lewis, J. D.; Limosani, A.; Lin, C.-J.; Linacre, J.; Lindgren, M.; Lipeles, E.; Lister, A.; Litvintsev, D. O.; Liu, C.; Liu, Q.; Liu, T.; Lockwitz, S.; Loginov, A.; Lucchesi, D.; Lueck, J.; Lujan, P.; Lukens, P.; Lungu, G.; Lys, J.; Lysak, R.; Madrak, R.; Maeshima, K.; Makhoul, K.; Malik, S.; Manca, G.; Manousakis-Katsikakis, A.; Margaroli, F.; Marino, C.; Martínez, M.; Martínez-Ballarín, R.; Mastrandrea, P.; 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.

2011-10-01

87

In-source decay and pseudo tandem mass spectrometry fragmentation processes of entire high mass proteins on a hybrid vacuum matrix-assisted laser desorption ionization-quadrupole ion-trap time-of-flight mass spectrometer.  

PubMed

In-source decay (ISD), although a process known for decades in mass spectrometry, has a renewed interest due to increased theoretical knowledge in fragmentation processes of large biomolecules coupled with technological improvements. We report here an original method consisting of isolating matrix-assisted laser desorption ionization (MALDI)-generated in-source fragments of large proteins and subsequently performing selective fragmentation experiments (up to four cycles) using a hybrid MALDI quadrupole ion-trap time-of-flight mass spectrometer (MALDI-QIT-TOF). This technology takes advantage of keeping high resolution on the selection of precursors and detection of fragments. It allows exhaustive N- and C-terminal sequencing of proteins. In this work, human serum albumin (HSA), ?-casein, and recombinant Tau proteins were submitted to in source decay in the MALDI source. The fragments were stored in the ion-trap and submitted to sequential collision-induced dissociation (CID). Finally, ISD and pseudo MS(n) were performed on oxidized Tau protein and acetylated bovine serum albumin to identify amino acid modifications. This work highlights the potential of the MALDI-QIT-TOF instrument for pseudo MS(n) strategies and top down proteomics. PMID:22721425

Sellami, Lyna; Belgacem, Omar; Villard, Claude; Openshaw, Matthew E; Barbier, Pascale; Lafitte, Daniel

2012-05-25

88

Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at sqrt{s}=7 TeV  

NASA Astrophysics Data System (ADS)

A search for resonances produced in 7 TeV proton-proton collisions and decaying into top-quark pairs is described. In this Letter events where the top-quark decay produces two massive jets with large transverse momenta recorded with the ATLAS detector at the Large Hadron Collider are considered. Two techniques that rely on jet substructure are used to separate top-quark jets from those arising from light quarks and gluons. In addition, each massive jet is required to have evidence of an associated bottom-quark decay. The data are consistent with the Standard Model, and limits can be set on the production cross section times branching fraction of a Z' boson and a Kaluza-Klein gluon resonance. These limits exclude, at the 95% credibility level, Z' bosons with masses 0.70-1.00 TeV as well as 1.28-1.32 TeV and Kaluza-Klein gluons with masses 0.70-1.62 TeV.

Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Aharrouche, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; 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.; Allbrooke, B. M. M.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; 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.; Angelidakis, S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Argyropoulos, S.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnault, C.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astbury, A.; Atkinson, M.; Aubert, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Avramidou, R.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Backus Mayes, J.; Badescu, E.; Bagnaia, P.; Bahinipati, S.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, M. D.; Baker, S.; Balek, P.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; 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, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Begel, M.; Behar Harpaz, S.; Behera, P. K.; Beimforde, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; 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.; Bernat, P.; Bernhard, R.; Bernius, C.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; 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.; Bittner, B.; Black, C. W.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blanchot, G.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blondel, A.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boek, T. T.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Brown, H.; Bruckman de Renstrom, P. A.; Bruncko, D.

2013-01-01

89

Search for a narrow, spin-2 resonance decaying to a pair of Z bosons in the qq¯?+?- final state  

NASA Astrophysics Data System (ADS)

Results are presented from a search for a narrow, spin-2 resonance decaying into a pair of Z bosons, with one Z-boson decaying into leptons (e+e- or ?+?-) and the other into jets. An example of such a resonance is the Kaluza-Klein graviton, GKK, predicted in Randall-Sundrum models. The analysis is based on a 4.9 fb-1 sample of proton-proton collisions at a center-of-mass energy of 7 TeV, collected with the CMS detector at the LHC. Kinematic and topological properties including decay angular distributions are used to discriminate between signal and background. No evidence for a resonance is observed, and upper limits on the production cross sections times branching fractions are set. In two models that predict Z-boson spin correlations in graviton decays, graviton masses are excluded lower than a value which varies between 610 and 945 GeV, depending on the model and the strength of the graviton couplings.

CMS Collaboration 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.; Hammer, J.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Pernicka, M.; Rahbaran, B.; Rohringer, C.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Waltenberger, W.; Walzel, G.; Widl, E.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Luyckx, S.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Staykova, Z.; 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.; 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 Marcken, G.; 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.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Verwilligen, P.; 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.; Schul, N.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Correa Martins Junior, M.; De Jesus Damiao, D.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Aldá Júnior, W. L.; Carvalho, W.; Custódio, A.; Da Costa, E. M.; De Oliveira Martins, C.; Fonseca De Souza, S.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Oguri, V.; Prado Da Silva, W. L.; Santoro, A.; Soares Jorge, L.; Sznajder, 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, S.; Guo, Y.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Teng, H.; Wang, D.; Zhang, L.; Zhu, B.; Zou, W.; Avila, C.; 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.; Morovic, S.; 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.; Khalil, S.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Müntel, 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.; Banzuzi, K.; Karjalainen, A.; Korpela, A.; Tuuva, T.; Besancon, M.; Choudhury, S.; 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.; Shreyber, I.; Titov, M.; Baffioni, S.; Beaudette, F.; Benhabib, L.; Bianchini, L.; Bluj, M.; Broutin, C.; Busson, P.; Charlot, C.; Daci, N.; Dahms, T.; Dobrzynski, L.; 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.; Ferro, C.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Juillot, P.; Le Bihan, A.-C.; Van Hove, P.; Fassi, F.; Mercier, D.; Beauceron, S.; Beaupere, N.; Bondu, O.; Boudoul, G.; 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.; Sordini, V.; Tschudi, Y.; Verdier, P.; Viret, S.; Tsamalaidze, Z.; Anagnostou, G.; Beranek, S.; Edelhoff, M.; Feld, L.; Heracleous, N.; Hindrichs, O.

2013-01-01

90

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

SciTech Connect

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.

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

2010-05-15

91

Proton decay of {sup 18}Ne states populated in the {sup 14}O+{alpha} resonance interaction  

SciTech Connect

Single and double proton emissions in the {sup 14}O+{sup 4}He interaction were observed with the thick target inverse kinematic method at initial energy for {sup 14}O at 32.7 MeV. It was found that the protons mainly originate from the resonance excitation of states in {sup 18}Ne. The decay of a state in {sup 18}Ne at E{sub ex} = 8.45 MeV demonstrates the features of a decay by a correlated proton pair.

Fu Changbo; Goldberg, V. Z.; Mukhamedzhanov, A. M.; Chubarian, G. G.; McCleskey, M.; Zhai, Y.; Al-Abdullah, T.; Tabacaru, G.; Trache, L.; Tribble, R. E. [Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States); Rogachev, G. V. [Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States); Skorodumov, B. [Department of Physics, University of Notre Dame, Indiana 46556 (United States)

2008-04-17

92

Dynamic electronic after-effects of nuclear decay in Mössbauer resonances  

Microsoft Academic Search

A theory has been constructed for the effect of a decaying atomic state on the Mössbauer line shapes. A most general case has been considered in which the nucleus interacts with its surroundings via electric monopole as well as electric quadrupole and magnetic dipole coupling, and the decay of the excited atomic state results in a change in the direction

Ajay Gupta; K. Rama Reddy

1983-01-01

93

Search for exotic resonances decaying into WZ/ZZ in pp collisions at sqrt{s}=7 TeV  

NASA Astrophysics Data System (ADS)

A search for new exotic particles decaying to the VZ final state is performed, where V is either a W or a Z boson decaying into two overlapping jets and the Z decays into a pair of electrons, muons or neutrinos. The analysis uses a data sample of pp collisions corresponding to an integrated luminosity of 5 fb-1 collected by the CMS experiment at the LHC at sqrt{s}=7 TeV in 2011. No significant excess is observed in the mass distribution of the VZ candidates compared with the background expectation from standard model processes. Model-dependent upper limits at the 95% confidence level are set on the product of the cross section times the branching fraction of hypothetical particles decaying to the VZ final state as a function of mass. Sequential standard model W' bosons with masses between 700 and 940 GeV are excluded. In the Randall-Sundrum model for graviton resonances with a coupling parameter of 0.05, masses between 750 and 880 GeV are also excluded.[Figure not available: see fulltext.

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.; Hammer, J.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Pernicka, M.; Rahbaran, B.; Rohringer, C.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Waltenberger, W.; Walzel, G.; Widl, E.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Luyckx, S.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Staykova, Z.; 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.; 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 Marcken, G.; 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.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Verwilligen, P.; 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.; Schul, N.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Correa Martins, M.; De Jesus Damiao, D.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Aldá, W. L.; Carvalho, W.; Custódio, A.; Da Costa, E. M.; De Oliveira Martins, C.; Fonseca De Souza, S.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Oguri, V.; Prado Da Silva, W. L.; Santoro, A.; Soares Jorge, L.; Sznajder, 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.; Gomez, J. P.; Gomez Moreno, B.; Osorio Oliveros, A. F.; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Plestina, R.; Polic, D.; Puljak, I.; Antunovicc, Z.; Kovac, M.; Brigljevic, V.; Duric, S.; Kadija, K.; Luetic, J.; Morovic, S.; 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.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Müntel, 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.; Banzuzi, K.; Karjalainen, A.; Korpela, A.; Tuuva, T.; Besancon, M.; Choudhury, S.; 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.; Shreyber, I.; Titov, M.; Baffioni, S.; Beaudette, F.; Benhabib, L.; Bianchini, L.; Bluj, M.; Broutin, C.; Busson, P.; Charlot, C.; Daci, N.; Dahms, T.; Dobrzynski, L.; 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.; Ferro, C.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Juillot, P.; Le Bihan, A.-C.; Van Hove, P.; Fassi, F.; Mercier, D.; Beauceron, S.; Beaupere, N.; Bondu, O.; Boudoul, G.; 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.; Anagnostou, G.; Autermann, C.; Beranek, S.; Edelhoff, M.; Feld, L.; Heracleous, N.; Hindrichs, O.; Jussen, R.; Klein, K.; Merz, J.

2013-02-01

94

Angular distribution of Auger electrons in the decay of resonantly excited 4d-13/2,5/2 6p states in Xe  

NASA Astrophysics Data System (ADS)

The angular distribution of Auger electrons originating from the decay of resonantly excited 4d-16p states in Xe has been studied with very high photon and electron energy resolution. The resolution enhancement via the Auger resonant Raman effect has enabled to resolve the ? parameters for individual resonant Auger transitions. The results are compared to previous experiments and to theoretical predictions calculated by using the multiconfigurational Dirac-Fock approach.

Aksela, H.; Jauhiainen, J.; Nõmmiste, E.; Sairanen, O.-P.; Karvonen, J.; Kukk, E.; Aksela, S.

1996-10-01

95

EXISTENCE OF SUPERSCRIPT 4 SUBSCRIPT LAMBDA SUBSCRIPT LAMBDA H AND DECAY TO A RESONANCE IN SUPERSCRIPT 4 LAMBDA.  

SciTech Connect

Experiment E906 at the BNL-AGS, searching for light S = -2 hypernuclei, found strong evidence for the nuclide {sub {Lambda}{Lambda}}{sup 4}H. Perhaps the most striking feature of this experiment was the presence in the data of a narrow low-momentum {pi}{sup -} line at k{sub {pi}} = 104-105 MeV/c. This line was ascribed to the decay of {sub {Lambda}{Lambda}}{sup 4}H into a resonant state in {sub {Lambda}}{sup 4}H. The existence of such a state is shown to be plausible, its characteristics delineated, and its relevance to ongoing theoretical calculations considered.

KAHANA,S.H.MILLENER,D.J.

2003-10-14

96

Effects of off-diagonal radiative-decay coupling on electron transitions in resonant double quantum wells  

NASA Astrophysics Data System (ADS)

Density-matrix equations for electrons in laser-coupled quantum wells are derived in second quantization, including an off-diagonal radiative-decay coupling between a pair of electron transitions. Calculations of spontaneous photoluminescence and time-resolved optical absorption for the probe field are formulated. The zero absorption of the pump-laser field within an overlapping region between two absorption peaks is found in a resonant asymmetric double-quantum-well system and explained as the quantum interference between two nearly degenerate electron transitions. Quantum interference is clearly demonstrated through phase cancellation between the two statistically averaged transition dipole moments. The laser frequency for zero absorption can be tuned within a tunneling gap by applying a small dc bias field. The k||-dependent energy-level separation is found to be a crucial factor for destroying quantum interference. The optical gain of the probe field is seen as a hole in the weak absorption peak for the resonant asymmetric double quantum wells selectively coupled by a laser field and shown to be a result of the partial inversion of the electron occupation probabilities in momentum space after laser excitation. The probe-field gain increases with the strength of the pump laser. The effects of transition blocking, induced quantum coherence, and off-diagonal radiative-decay coupling are quantitatively analyzed for this gain.

Huang, Danhong; Cardimona, D. A.

2001-07-01

97

Decay of the loosely bound or resonant. lambda. Lambda-bar state and comparison with recent experimental data  

SciTech Connect

The decay of the narrow state xi/X(2.2) observed by the Mark III and GAMS groups is studied, assuming that it is a loosely bound or resonant ..lambda..Lambda-bar state. The branching ratios of the decay into two nonstrange mesons and to etaeta, etaeta', and to phiphi are calculated in the /sup 3/P/sub 0/ model or the quark-annihilation model with two qq-bar pair annihilations and one qq-bar pair creation. The xi(2.2) with the quantum number /sup 3/P/sub 2/ is not in conflict with the model if the coupling to the intermediate ss-bar and to the intermediate (uu-bar+dd-bar)/ ..sqrt..2 are different, which is suggested by the flux-tube model and the e/sup +/e/sup -/..-->..hadron jets experiment. X(2.2) with the quantum number /sup 3/P/sub 0/ can also be a loosely bound ..lambda..Lambda-bar but in the decay the quark rearrangement with one qq-bar pair annihilation may also play a role in this state.

Furui, S.; Ono, S.

1988-10-01

98

The decay of isoscalar giant resonances in 24Mg and 40Ca  

NASA Astrophysics Data System (ADS)

In this paper we present data on the charged-particle decay of the isoscalar 2+ strength between 10 and 20 MeV excitation energy (Ex) in 24Mg and 40Ca. The isoscalar strength was excited by inelastic scattering of 120MeV ?-particles at 14° and 12.5° for 24Mg and 40Ca, respectively. The charged particles originating from the decay were detected in coincidence with the ?' particles at several angles in the scattering plane. J? assignments of the decaying states were made on the basis of the angular correlation pattern of the ?0 decay to the ground state of 20Ne and 36Ar, respectively, using a DWBA calculation for the m-state population of the decaying state. For 40Ca, about 40% of the E2 EWSR is found to be located in the interval Ex = 13.5 +/- 1.5 MeV, which is similar to what has been found from previous inelastic scattering experiments at Ex = 18 +/- 2 MeV, but much more than such experiments located in the region Ex = 12-15 MeV. The difference for the region Ex < 16 MeV is due to the fact that from our ?0 angular correlation pattern we conclude that virtually no continuum is excited in the (?, ?') process up to Ex = 16 MeV while all previous inelastic hadron scattering experiments assumed such a continuum to be present. The E2 strength distribution for 40Ca thus obtained is very different from what previous theoretical calculations predict. For 24Mg about 30% of the E2 EWSR is present in the interval 12.5 <= Ex <= experiments. 16.5 MeV which again is about twice as much as deduced from previous inelastic scattering The observed branching ratios are compared with calculated ones assuming statistical decay. Reasonable agreement was obtained for 40Ca, but for 24Mg especially the ?0-decay branch and to a lesser extent also the p1 one are much stronger than the statistical calculations predict, indicating that especially the ?0 decay occurs mainly in a non-statistical way. A similar conclusion can be drawn from the behaviour of the forward-backward asymmetry in the angular correlations of the decay particles as a function of the excitation energy FBA(Ex). For 40Ca, FBA(Ex) for all decay channels increases smoothly on the average once Ex is above a well-defined threshold, which is due to the onset of knock-out processes. For 24Mg, however, the FBA(Ex) for the ?0 shows a large fluctuation as a function of Ex, indicating an interference process between semi-direct decay and knock-out processes.

Zwarts, F.; Drentje, A. G.; Harakeh, M. N.; van der Woude, A.

1985-06-01

99

Selective alpha particle decay of 12C+12C resonances to excited 20Ne rotational bands observed in the 12C(12C,?)20Ne reaction  

NASA Astrophysics Data System (ADS)

Excitation functions of the 12C(12C,?)20Ne reaction were measured at ?lab=7.5° between Ec.m.=14-40 MeV and angular distributions were measured from Ec.m.=17.8 to 20.6 MeV. Summed yields reveal prominent intermediate structure resonances over the entire range which correlate well to resonances previously observed in elastic data. The resonances show enhanced decays to excited rotational bands in 20Ne with reduced widths comparable to those for the elastic channel and an order of magnitude greater than those for the 20Ne ground state band. A discussion is given of the resonances as shape-isomeric states in a shell model secondary minimum in 24Mg, and of the selective alpha decay as being transitions to states of related configuration in 20Ne.

Ledoux, R. J.; Ordon¯Ez, C. E.; Bechara, M. J.; Al-Juwair, H. A.; Lavelle, G.; Cosman, E. R.

1984-09-01

100

A study of the hadronic resonance structure in the decay ?-->3???  

NASA Astrophysics Data System (ADS)

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 compared with each model. Below m3?2=2.3 GeV2, all are in good qualitative agreement. Above m3?2=2.3 GeV2, anomalous behaviour is observed, consistent with the existence of a hitherto unseen decay mode of the ? through a radial excitation of the a1 meson.

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

1998-05-01

101

Two-photon decay widths of charmonium resonances formed in proton-antiproton annihilations  

NASA Astrophysics Data System (ADS)

E835 is an experiment dedicated to the precision study of charmonium formed in p¯p annihilations at the Fermilab Antiproton Accumulator. E835 has measured the resonance parameters of the hc resonance: M(hc) = 2985.4 +/- 2.1 MeV, G(hc) =2.1+/-7.56.2 MeV, and G(hc-->gg )=3.9+/-1.5 1.3+/-1.81.1 . Also reported is the two photon width of the c2 , G(c2-->gg )=0.29+/-0.06+/-0.04 . A search for the h'c resonance has resulted in an upper limit for the product of the branching ratios B(h'c--> pp)×B( h'c-->gg) < 12 × 10-8. An upper limit G(c0-->gg ) < 2.7 keV is set.

Stancari, Michelle Dawn

102

12C+16O: Properties of sub-barrier resonance ?-decay  

NASA Astrophysics Data System (ADS)

In a recent experiment performed at Triumf using the Dragon 0° spectrometer and its associated BGO array, the complete ?-decay of the radiative capture channel below the Coulomb barrier has been measured for the first time. This measurement has been performed at two energies Ec.m. = 6.6 and 7.2 MeV. A selective contribution of the entrance spins 2+ and 3- has been evidenced which is consistent with existing results above the barrier.

Goasduff, A.; Courtin, S.; Haas, F.; Lebhertz, D.; Jenkins, D. G.; Fallis, J.; Ruiz, C.; Hutcheon, D. A.; Amandruz, P.-A.; Davis, C.; Hager, U.; Ottewell, D.; Ruprecht, G.

2012-10-01

103

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

Microsoft Academic Search

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

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

104

Decay properties of tau leptons measured at the Z0 resonance  

Microsoft Academic Search

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

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

105

Search for W{sup '} Boson Resonances Decaying to a Top Quark and a Bottom Quark  

SciTech Connect

We search for the production of a heavy W{sup '} gauge boson that decays to third generation quarks in 0.9 fb{sup -1} of pp collisions at {radical}(s)=1.96 TeV, 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 left-handed W{sup '} boson with SM couplings, we set a lower mass limit of 731 GeV. For right-handed W{sup '} bosons, we set lower mass limits of 739 GeV if the W{sup '} boson decays to both leptons and quarks and 768 GeV if the W{sup '} boson decays only to quarks. We also set limits on the coupling of the W{sup '} boson to fermions as a function of its mass.

Abazov, V. M.; Alexeev, G. D.; Kalinin, A. M.; Kharzheev, Y. M.; Malyshev, V. L.; Tokmenin, V. V.; Vertogradov, L. S.; Yatsunenko, Y. A. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Abbott, B.; Gutierrez, P.; Hossain, S.; Jain, S.; Rominsky, M.; Severini, H.; Skubic, P.; Strauss, M. [University of Oklahoma, Norman, Oklahoma 73019 (United States); Abolins, M.; Benitez, J. A.; Brock, R.; Dyer, J. [Michigan State University, East Lansing, Michigan 48824 (United States)] (and others)

2008-05-30

106

Search for W-prime Boson Resonances Decaying to a Top Quark and a Bottom Quark  

SciTech Connect

We search for the production of a heavy W{prime} gauge boson that decays to third generation quarks in 0.9 fb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV, 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 left-handed W{prime} boson with SM couplings, we set a lower mass limit of 731 GeV. For right-handed W{prime} bosons, we set lower mass limits of 739 GeV if the W{prime} boson decays to both leptons and quarks and 768 GeV if the W{prime} boson decays only to quarks. We also set limits on the coupling of the W{prime} boson to fermions as a function of its mass.

Abazov, V.M.; Abbott, B.; /Dubna, JINR; Abolins, M.; /Oklahoma U.; Acharya, B.S.; /Michigan State U.; Adams, M.; /Tata Inst.; Adams, T.; /Illinois U., Chicago; Aguilo, E.; /Florida State U.; Ahn, S.H.; /York U., Canada; Ahsan, M.; /Korea U., KODEL; Alexeev, G.D.; /Kansas State U.; Alkhazov, Georgiy; /Dubna, JINR /St. Petersburg, INP /Northeastern U.

2008-03-01

107

Search for a narrow baryonic resonance decaying to K s 0 p or K s 0 p ¯ in deep inelastic scattering at HERA  

Microsoft Academic Search

A search for a narrow baryonic resonance decaying to Ks0p or Ks0p¯ is carried out in deep inelastic ep scattering with the H1 detector at HERA. Such a resonance could be a strange pentaquark ?+, evidence for which has been reported by several experiments. The Ks0p and Ks0p¯ invariant mass distributions presented here do not show any significant peak in

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

2006-01-01

108

Excitation and decay of the isovector spin-flip giant monopole resonance via the 208Pb( 3He, tp) reaction at 410 MeV  

Microsoft Academic Search

The excitation and subsequent decay by proton emission of the isovector spin-flip giant monopole resonance are studied via the208Pb(3He,t) reaction at 410 MeV. In the triton-singles spectrum 60 ± 5% of the non-energy-weighted sum-rule strength for this 2?? resonance is found in the region29 < Ex(208Bi) < 51 MeV. The central excitation energy and width of the IVSGMR are determined

R. G. T. Zegers; H. Abend; H. Akimune; A. M. van den Berg; H. Fujimura; H. Fujita; Y. Fujita; M. Fujiwara; K. Hara; M. N. Harakeh; T. Ishikawa; T. Kawabata; K. Kawase; T. Mibe; K. Nakanishi; S. Nakayama; H. Toyokawa; M. Uchida; T. Yamagata; K. Yamasaki; M. Yosoi

2004-01-01

109

Study of Branching Ratio And Polarization Fraction in Neutral B Meson Decays to Negative Rho Meson Positive Kaon Resonance  

SciTech Connect

We present the preliminary results on the search for B{sup 0} {yields} {rho}{sup -}K*{sup +}. The data sample comprises 122.7 million B{bar B} pairs in the e{sup +}e{sup -} annihilation through the {Upsilon}(4S) resonance collected during 1999-2003 with the BABAR detector at the PEP-II asymmetric-energy collider at Stanford Linear Accelerator Center (SLAC). We obtain an upper limit of the branching ratio at 90% confidence level as {Beta}(B{sup 0} {yields} {rho}{sup -}K*{sup +}) < 17.2 x 10{sup -6}. The fitted result on the polarization fraction shows no evidence that the decay is longitudinally dominated as predicted by various theoretical models.

Cheng, Baosen; /Wisconsin U., Madison

2006-03-07

110

Studying ultra-cold molecules formation and decay via a feshbach resonance  

Microsoft Academic Search

Quantum degenerate sodium dimer molecules are produced from an atomic Bose-Einstein condensate via a magnetically induced Feshbach resonance, with an initial phase-space density above 20. Atom-molecule coupling strength is probed by studying dissociation dynamics above threshold

K. Xu. T. Mukaiyama; J. R. Abo-Shaeer; J. K. Chin; D. E. Miller; W. Ketterle

2004-01-01

111

Utility decay rates of t(1)-weighted magnetic resonance imaging contrast based on redox-sensitive paramagnetic nitroxyl contrast agents.  

PubMed

The availability and applicability of the combination of paramagnetic nitroxyl contrast agent and T(1)-weighted gradient echo (GE)-based dynamic magnetic resonance imaging (MRI) measurement for redox imaging are described. The time courses of T(1)-weighted GE MRI signal intensities according to first-order paramagnetic loss of a nitroxyl contrast agent were simulated for several experimental conditions. The apparent decay rate calculated based on decreasing T(1)-weighted MRI contrast (k(MRI)) can show an approximate value of the original decay rate (k(true)) discretionarily given for simulation with suitable experimental parameters. The difference between k(MRI) and k(true) can be sufficiently small under T(1)-weighted spoiled gradient echo (SPGR) scan conditions (repetition time=75 ms, echo time=3 ms, and flip angle=45 degrees ), with a conventional redox-sensitive nitroxyl contrast agent, such as 4-hydroxy-2,2,6,6,-tetramethylpiperidine-N-oxyl (TEMPOL) and/or 3-carbamoyl-2,2,5,5-tetramethylpyrrolidine-N-oxyl (carbamoyl-PROXYL), and with i.v. doses of below 1.5 micromol/g b.w. for mice. The results of this simulation suggest that the k(MRI) of nitroxyl contrast agents can be the primary index of redox status under biological conditions. PMID:19336910

Matsumoto, Ken-Ichiro

2009-04-01

112

{sup 12}C+{sup 16}O: Properties of sub-barrier resonance {gamma}-decay  

SciTech Connect

In a recent experiment performed at Triumf using the Dragon 0 Degree-Sign spectrometer and its associated BGO array, the complete {gamma}-decay of the radiative capture channel below the Coulomb barrier has been measured for the first time. This measurement has been performed at two energies E{sub c.m.}= 6.6 and 7.2 MeV. A selective contribution of the entrance spins 2{sup +} and 3{sup -} has been evidenced which is consistent with existing results above the barrier.

Goasduff, A.; Courtin, S.; Haas, F.; Lebhertz, D.; Jenkins, D. G.; Fallis, J.; Ruiz, C.; Hutcheon, D. A.; Amandruz, P.-A.; Davis, C.; Hager, U.; Ottewell, D.; Ruprecht, G. [Universite de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg (France) and CNRS, UMR7178, 67037 Strasbourg (France); GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5 (France); Department of Physics, University of York, Heslington, York YO10 5DD (United Kingdom); TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)

2012-10-20

113

Search for WW and WZ Resonances Decaying to Electron, Missing ET, and Two Jets in p(p)over-bar Collisions at root s=1.96 TeV  

Microsoft Academic Search

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

T. Aaltonen; J. Adelman; B. A. Gonzalez; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. Appel; A. Apresyan; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; A. Attal; A. Aurisano; F. Azfar; W. Badgett; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; G. Bauer; P. H. Beauchemin; F. Bedeschi; D. Beecher; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; M. Binkley; D. Bisello; I. Bizjak; R. E. Blair; C. Blocker; B. Blumenfeld; A. Bocci; A. Bodek; V. Boisvert; D. Bortoletto; J. Boudreau; A. Boveia; B. Brau; A. Bridgeman; L. Brigliadori; C. Bromberg; E. Brubaker; J. Budagov; H. S. Budd; S. Budd; K. Burkett; G. Busetto; P. Bussey; A. Buzatu; K. L. Byrum; S. Cabrera; 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; S. H. Chang; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; F. Chlebana; K. Cho; D. Chokheli; J. P. Chou; K. Chung; W. H. Chung; Y. S. Chung; T. Chwalek; C. I. Ciobanu; M. A. Ciocci; A. Clark; D. Clark; G. Compostella; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; F. Crescioli; C. C. Almenar; J. Cuevas; R. Culbertson; J. C. Cully; D. Dagenhart; N. dAscenzo; M. Datta; T. Davies; P. de Barbaro; S. De Cecco; A. Deisher; G. De Lorenzo; M. DellOrso; C. Deluca; L. Demortier; J. Deng; M. Deninno; M. dErrico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. DOnofrio; S. Donati; P. Dong; T. Dorigo; S. Dube; K. Ebina; A. Elagin; R. Erbacher; D. Errede; S. Errede; N. Ershaidat; R. Eusebi; H. C. Fang; S. Farrington; W. T. Fedorko; R. G. Feild; M. Feindt; J. P. Fernandez; C. Ferrazza; R. Field; G. Flanagan; R. Forrest; M. J. Frank; M. Franklin; J. C. Freeman; I. Furic; M. Gallinaro; J. Galyardt; F. Garberson; J. E. Garcia; A. F. Garfinkel; P. Garosi; H. Gerberich; D. Gerdes; A. Gessler; S. Giagu; V. Giakoumopoulou; P. Giannetti; K. Gibson; J. L. Gimmell; C. M. Ginsburg; N. Giokaris; M. Giordani; P. Giromini; M. Giunta; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; 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; U. Grundler; J. G. da Costa; Z. Gunay-Unalan; C. Haber; S. R. Hahn; E. Halkiadakis; B. Y. Han; J. Y. Han; F. Happacher; K. Hara; D. Hare; M. Hare; R. F. Harr; M. Hartz; K. Hatakeyama; C. Hays; M. Heck; J. Heinrich; M. Herndon; J. Heuser; S. Hewamanage; D. Hidas; C. S. Hill; D. Hirschbuehl; A. Hocker; S. Hou; M. Houlden; S. C. Hsu; R. E. Hughes; M. Hurwitz; U. Husemann; M. Hussein; J. Huston; J. Incandela; 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; J. E. Jung; T. R. Junk; T. Kamon; D. Kar; P. E. Karchin; Y. Kato; R. Kephart; 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; L. Kirsch; S. Klimenko; B. R. Ko; K. Kondo; D. J. Kong; J. Konigsberg; A. Korytov; A. V. Kotwal; M. Kreps; J. Kroll; D. Krop; N. Krumnack; M. Kruse; V. Krutelyov; T. Kuhr; N. P. Kulkarni; 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. Leone; J. D. Lewis; C. J. Lin; J. Linacre; M. Lindgren; E. Lipeles; A. Lister; D. O. Litvintsev; C. Liu; T. Liu; N. S. Lockyer; A. Loginov; L. Lovas; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; D. MacQueen; R. Madrak; K. Maeshima; K. Makhoul; P. Maksimovic; S. Malde; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; C. Marino; A. Martin; V. Martin; 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; N. Miladinovic; R. Miller; C. Mills; M. Milnik; A. Mitra; G. Mitselmakher; H. Miyake; S. Moed; N. Moggi; M. N. Mondragon; C. S. Moon; R. Moore; M. J. Morello; J. Morlock; P. M. Fernandez; J. Mulmenstadt; A. Mukherjee; T. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; K. Nakamura; I. Nakano; A. Napier; J. Nett; C. Neu; M. S. Neubauer; S. Neubauer; J. Nielsen; L. Nodulman; M. Norman; O. Norniella; E. Nurse; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; K. Osterberg; S. P. Griso; C. Pagliarone; E. Palencia; V. Papadimitriou; A. Papaikonomou; A. A. Paramanov; B. Parks; S. Pashapour; J. Patrick; G. Pauletta; M. Paulini; C. Paus; T. Peiffer; D. E. Pellett; A. Penzo; T. J. Phillips; G. Piacentino; E. Pianori; L. Pinera

2010-01-01

114

Measurement of the relative amplitude and strong phase between antineutral D meson decaying to kaon+ resonance kaon- and neutral D meson decaying to kaon+ resonance kaon- via Dalitz plot analysis of neutral D meson decaying to kaon+ kaon- neutral pion decays  

NASA Astrophysics Data System (ADS)

I present physics concepts, which are useful to understand our analyses, and describe the CLEO III and CLEO-c experiments at the Cornell Electron Storage Ring. I also present motivations for a Dalitz plot analysis of the Cabibbo-suppressed charmed meson decay mode D0 ? K+K-pi 0 at CLEO. The analysis uses 9.0 fb-1 of data collected at s ? 10.58 GeV with the CLEO III detector. We find the strong phase difference deltaD ? argAD 0?K*+K- AD0?K*+K - = 332° +/- 8° +/- 11° and relative amplitude rD ? AD0? K*+K-A D0?K*+K- = 0.52 +/- 0.05 +/- 0.04. This measurement indicates significant destructive interference between D0 ? K+(K-pi 0)K*- and D0 ? K- (K+pi0) K*+ in the D 0 ? K+ K-pi0 Dalitz plot region where these two modes overlap. The fit includes the K*+/- and ? resonances and a non-resonant amplitude, and the measured fit fractions for each resonance (with statistical uncertainty only) are (46.1 +/- 3.1)% for the K*+, (12.3 +/- 2.2)% for the K*-, (14.9 +/- 1.6)% for the ?, and (36.0 +/- 3.7)% for the non-resonant contribution. We find deltaD = 313° +/- 9° (stat.) and an amplitude ratio of rD = 0.52 +/- 0.05 (stat.) from a second fit which substitutes scalar kappa+/- (mass 878 MeV/c2, width 499 MeV/c2) amplitudes for the non-resonant amplitude. The measured fit fractions for each resonance (with statistical uncertainty only) are (48.1 +/- 4.5)% for the K*+, (12.9 +/- 2.6)% for the K*-, (16.1 +/- 1.9)% for the ?, (12.6 +/- 5.8)% for the kappa+, and (11.1 +/- 4.7)% for the kappa-. We also investigate the D 0 ? K+K -pi0 Dalitz plot in 281 pb-1 of data collected at s ? 3.77 GeV with the CLEO-c detector. We find results which are consistent with the CLEO III analysis. I conclude by summarizing our results and present a brief appendix detailing the K-matrix formalism.

Naik, Paras P.

115

Dynamically Generated Resonances from Two Vectors in the Charm Sector and their Decays  

NASA Astrophysics Data System (ADS)

In this talk we study dynamically generated resonances from two-vector mesons within the hidden gauge formalism in a coupled channel unitary approach. We focus on the sectors with charm and/or strangeness and double charm, being some of them flavor exotic. Concretely, by looking for poles in the complex plane, we get three poles in the T-matrix around 2,460, 2,640 and 2,572 MeV that we identify with the and , coupling strongly to D* ? (the first two) and D* K* respectively. In addition, we obtain resonances in other exotic sectors such as ( charm = 1; strangeness = -1), ( charm = 2; strangeness = 0, 1). This 'flavor-exotic' states are interpreted as and molecular states and have not been observed yet. The observation of these peculiar states is a challenge for the experimentalist.

Molina, R.; Nagahiro, H.; Hosaka, A.; Branz, T.; Oset, E.

2013-08-01

116

Resonant Auger Decay of Xe 3d-16p to Xe+ 4d-2np  

NASA Astrophysics Data System (ADS)

Angle-resolved resonant Auger spectra for the transitions Xe 3d5/2-16p -> 4d-2np are recorded with optical and electron energy bandwidths smaller than the lifetime widths ? of the Auger initial and final states. All the multiplet structures are resolved for the ionic core 4d-2 of the spectator Auger final states and assigned as 4d-21S0np, 1D2np, 1G4np, 3P0, 1, 2np and 3F1, 2, 3np, n = 6, 7, by comparison with previous measurements and calculations for the corresponding normal Auger emission. The resonant Auger anisotropy parameters obtained from the angular distribution measurements agree well with those expected from the spectator model.

de Fanis, Alberto; Ueda, Kiyoshi; Saito, Norio; Kitajima, Masashi; Tanaka, Hiroshi; Shimizu, Yuichiro; Okada, Kazumasa; Koyano, Inosuke

117

Study of the B0 semileptonic decay spectrum at the gamma(4S) resonance  

Microsoft Academic Search

We have made a first measurement of the lepton momentum spectrum in a sample of events enriched in neutral B's through a partial reconstruction of B0 -> D*-l+v. This spectrum, measured with 2.38 fb-1 of data collected at the gamma (4S) resonance by the CLEO II detector, is compared directly to the inclusive lepton spectrum from all gamma (4S) events

M. Artuso; A. Efimov; F. Frasconi; M. Gao; M. Goldberg; D. He; S. Kopp; G. C. Moneti; Y. Mukhin; S. Schuh; T. Skwarnicki; S. Stone; G. Viehhauser; X. Xing; J. Batelt; S. E. Csorna; V. Jain; S. Marka; A. Freyberger; R. Godang; K. Kinoshita; I. C. Lai; P. Pomianowski; S. Schrenk; G. Bonvicini; D. Cinabro; R. Greene; L. P. Perera; B. Barish; M. Chadha; S. Chan; G. Eigen; J. S. Miller; C. O'Grady; M. Schmidtler; J. Urheim; A. J. Weinstein; F. Würthwein; D. M. Asner; D. W. Bliss; W. S. Brower; G. Masek; H. P. Paar; V. Sharma; J. Gronberg; R. Kutschke; D. J. Lange; S. Menary; R. J. Morrison; H. N. Nelson; T. K. Nelson; C. Oiao; J. D. Richman; D. Roberts; A. Ryd; M. S. Witherell; R. Balest; B. H. Behrens; K. Cho; W. T. Ford; P. Rankin; J. Roy; J. G. Smith; J. P. Alexander; C. Bebek; B. E. Berger; K. Berkelman; K. Bloom; D. G. Cassel; H. A. Cho; D. M. Coffman; D. S. Crowcroft; M. Dickson; P. S. Drell; K. M. Ecklund; R. Ehrlich; R. Elia; A. D. Foland; P. Gaidarev; B. Gittelman; S. W. Gray; D. L. Hartill; B. K. Heltsley; P. I. Hopman; J. Kandaswamy; N. Katayama; P. C. Kim; D. L. Kreinick; T. Lee; Y. Liu; G. S. Ludwig; J. Masui; J. Mevissen; N. B. Mistry; C. R. Ng; E. Nordberg; M. Ogg; J. R. Patterson; D. Peterson; D. Riley; A. Soffer; C. Ward; M. Athanas; P. Avery; C. D. Jones; M. Lohner; C. Prescott; S. Yang; J. Yelton; J. Zheng; G. Brandenburg; R. A. Briere; Y. S. Gao; D. Y.-J. Kim; R. Wilson; H. Yamamoto; T. E. Browder; F. Li; Y. Li; J. L. Rodriguez; T. Bergfeld; B. I. Eisenstein; J. Ernst; G. E. Gladding; G. D. Gollin; R. M. Hans; E. Johnson; I. Karliner; M. A. Marsh; M. Palmer; M. Selen; J. J. Thaler; K. W. Edwards; A. Bellerive; R. Janicek; D. B. Macfarlane; K. W. McLean; P. M. Patel; A. J. Sadoff; R. Ammar; P. Baringer; A. Bean; D. Besson; D. Coppage; C. Darling; R. Davis; N. Hancock; S. Kotov; I. Kravchenko; N. Kwak; S. Anderson; Y. Kubota; M. Lattery; J. J. O'Neill; S. Patton; R. Poling; T. Riehle; V. Savinov; A. Smith; M. S. Alam; S. B. Athar; Z. Ling; A. H. Mahmood; H. Severini; S. Timm; F. Wappler; A. Anastassov; S. Blinov; J. E. Duboscq; K. D. Fisher; D. Fujino; R. Fulton; K. K. Gan; T. Hart; K. Honscheid; H. Kagan; R. Kass; J. Lee; M. B. Spencer; M. Sung; A. Undrus; R. Wanke; A. Wolf; M. M. Zoeller; B. Nemati; S. J. Richichi; W. R. Ross; P. Skubic; M. Wood; M. Bishai; J. Fast; E. Gerndt; J. W. Hinson; N. Menon; D. H. Miller; E. I. Shibata; I. P. J. Shipsey; M. Yurko; J. Gibbons; S. D. Johnson; Y. Kwon; S. Roberts; E. H. Thorndike; C. P. Jessop; K. Lingel; H. Marsiske; M. L. Perl; S. F. Schaffner; D. Ugolini; R. Wang; X. Zhou; T. E. Coan; V. Fadeyev; I. Korolkov; Y. Maravin; I. Narsky; V. Shelkov; J. Staeck; R. Stroynowski; I. Volobouev; J. Ye

1997-01-01

118

Study of the B 0 semileptonic decay spectrum at the ? (4S) resonance  

Microsoft Academic Search

We have made a first measurement of the lepton momentum spectrum in a sample of events enriched in neutral B's through a partial reconstruction of B0 ? D???+?. This spectrum, measured with 2.38 fb?1 of data collected at the ?(4S) resonance by the CLEO II detector, is compared directly to the inclusive lepton spectrum from all ?(4S) events in the

M Artuso; A Efimov; F Frasconi; M Gao; M Goldberg; D He; S Kopp; G. C Moneti; Y Mukhin; S Schuh; T Skwarnicki; S Stone; G Viehhauser; X Xing; J Bartelt; S. E Csorna; V Jain; S Marka; A Freyberger; R Godang; K Kinoshita; I. C Lai; P Pomianowski; S Schrenk; G Bonvicini; D Cinabro; R Greene; L. P Perera; B Barish; M Chadha; S Chan; G Eigen; J. S Miller; C O'Grady; M Schmidtler; J Urheim; A. J Weinstein; F Würthwein; D. M Asner; D. W Bliss; W. S Brower; G Masek; H. P Paar; V Sharma; J Gronberg; R Kutschke; D. J Lange; S Menary; R. J Morrison; H. N Nelson; T. K Nelson; C Qiao; J. D Richman; D Roberts; A Ryd; M. S Witherell; R Balest; B. H Behrens; K Cho; W. T Ford; P Rankin; J Roy; J. G Smith; J. P Alexander; C Bebek; B. E Berger; K Berkelman; K Bloom; D. G Cassel; H. A Cho; D. M Coffman; D. S Crowcroft; M Dickson; P. S Drell; K. M Ecklund; R Ehrlich; R Elia; A. D Foland; P Gaidarev; B Gittelman; S. W Gray; D. L Hartill; B. K Heltsley; P. I Hopman; J Kandaswamy; N Katayama; P. C Kim; D. L Kreinick; T Lee; Y Liu; G. S Ludwig; J Masui; J Mevissen; N. B Mistry; C. R Ng; E Nordberg; M Ogg; J. R Patterson; D Peterson; D Riley; A Soffer; C Ward; M Athanas; P Avery; C. D Jones; M Lohner; C Prescott; S Yang; J Yelton; J Zheng; G Brandenburg; R. A Briere; Y. S Gao; D. Y.-J Kim; R Wilson; H Yamamoto; T. E Browder; F Li; Y Li; J. L Rodriguez; T Bergfeld; B. I Eisenstein; J Ernst; G. E Gladding; G. D Gollin; R. M Hans; E Johnson; I Karliner; M. A Marsh; M Palmer; M Selen; J. J Thaler; K. W Edwards; A Bellerive; R Janicek; D. B MacFarlane; K. W McLean; P. M Patel; A. J Sadoff; R Ammar; P Baringer; A Bean; D Besson; D Coppage; C Darling; R Davis; N Hancock; S Kotov; I Kravchenko; N Kwak; S Anderson; Y Kubota; M Lattery; J. J O'Neill; S Patton; R Poling; T Riehle; V Savinov; A Smith; M. S Alam; S. B Athar; Z Ling; A. H Mahmood; H Severini; S Timm; F Wappler; A Anastassov; S Blinov; J. E Duboscq; K. D Fisher; D Fujino; R Fulton; K. K Gan; T Hart; K Honscheid; H Kagan; R Kass; J Lee; M. B Spencer; M Sung; A Undrus; R Wanke; A Wolf; M. M Zoeller; B Nemati; S. J Richichi; W. R Ross; P Skubic; M Wood; M Bishai; J Fast; E Gerndt; J. W Hinson; N Menon; D. H Miller; E. I Shibata; I. P. J Shipsey; M Yurko; L Gibbons; S. D Johnson; Y Kwon; S Roberts; E. H Thorndike; C. P Jessop; K Lingel; H Marsiske; M. L Perl; S. F Schaffner; D Ugolini; R Wang; X Zhou; T. E Coan; V Fadeyev; I Korolkov; Y Maravin; I Narsky; V Shelkov; J Staeck; R Stroynowski; I Volobouev; J Ye

1997-01-01

119

Circular polarization of ion fluorescence completing the analysis of resonant Xe* 4d(-1)(5/2)6p Auger decay.  

PubMed

The relative contributions of the partial electron waves emitted in the Auger decay of the Xe* 4d(-1)(5/2)6p(J(*)=1) resonance have been determined by fluorescence polarimetry after excitation with circularly polarized synchrotron radiation. The analysis of circularly polarized fluorescence of the photoion leads to an independent determination of the orientation parameters for all states of the Xe II 5p(4)6p multiplet. The present study provides, in combination with data on the angular distribution and spin polarization of the Auger electrons, complete quantum mechanical information on the resonant Auger decay, i.e., branching ratios and relative phases of the Auger decay amplitudes. PMID:12570543

O'Keeffe, P; Aloïse, S; Meyer, M; Grum-Grzhimailo, A N

2003-01-15

120

Pulse saturation recovery, pulse ELDOR, and free induction decay electron paramagnetic resonance detection using time-locked subsampling  

NASA Astrophysics Data System (ADS)

Time locked subsampling (TLSS) in electron paramagnetic resonance (EPR) involves the steps of (i) translation of the signal from a microwave carrier to an intermediate frequency (IF) carrier where the (IF) offset between the signal oscillator and local oscillator frequencies is synthesized, (ii) sampling the IF carrier four times in an odd number of cycles, say 4 in 3, where the analog-to-digital (A/D) converter is driven by a frequency synthesizer that has the same clock input as the IF synthesizer, (iii) signal averaging as required for adequate signal to noise, (iv) separating the even and odd digitized words into two separate signal channels, which correspond to signals in phase and in quadrature with respect to the IF carrier, i.e., I and Q, and (v) detecting the envelope of I and also of Q by changing the signs of alternate words in each of the two channels. TLSS detection has been demonstrated in three forms of pulse EPR spectroscopy at X band: saturation recovery, pulse electron-electron double resonance, and free induction decay. The IF was 187.5 MHz, the A/D converter frequency was 250 MHz, the overall bandwidth was 125 MHz, and the bandwidths for the separate I and Q channels were each 62.5 MHz. Experiments were conducted on nitroxide radical spin labels. The work was directed towards development of methodology to monitor bimolecular collisions of oxygen with spin labels in a context of site-directed spin labeling.

Froncisz, W.; Camenisch, Theodore G.; Ratke, Joseph J.; Hyde, James S.

2001-03-01

121

High Mass Star Formation in the Galaxy.  

National Technical Information Service (NTIS)

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 regi...

N. Z. Scoville J. C. Good

1987-01-01

122

Projection of excited orbitals into kinetic energies of emitted electrons in resonant Si KLL Auger decays of SiF{sub 4}  

SciTech Connect

Spectator resonant Auger-electron spectra have been measured in the Si 1s photoexcitation region of SiF{sub 4} using an electron spectroscopic technique combined with undulator radiation. A transition with the highest intensity in the total ion yield spectrum, which comes from excitation of a 1s electron into the 6t{sub 2} valence orbital, generates resonant Auger decays in which the excited electron remains predominantly in the valence orbital or is partly shaken up into a high-lying Rydberg orbital. The higher-lying peak generated through excitation into Rydberg orbitals induces resonant Auger decays in which the excited Rydberg electron is partly shaken up to a higher-lying Rydberg orbital or shaken down to a lower-lying valence molecular orbital. These findings exhibit a clear disentanglement effect among excited orbitals which are smeared out in the 1s electron excitation spectrum.

Suzuki, I. H. [Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801 (Japan); Kono, Y.; Ikeda, A.; Nagaoka, S. [Department of Chemistry, Faculty of Science, Ehime University, Matsuyama 790-8577 (Japan); Ouchi, T.; Ueda, K. [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Takahashi, O. [Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526 (Japan); Higuchi, I.; Tamenori, Y. [Japan Synchrotron Radiation Research Institute/SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun 679-5198 (Japan)

2010-10-15

123

High mass star formation in the galaxy  

Microsoft Academic Search

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 (nH2)1.9 where (nH2) is the local

N. Z. Scoville; J. C. Good

1987-01-01

124

Resonant Auger decay of Xe* 4 d -1 5/2 6p : A contribution to the complete experiment from fluorescence polarization studies  

NASA Astrophysics Data System (ADS)

Fluorescence polarimetry has been used to determine the relative partial-wave Auger decay widths for transitions to states of the XeII 5p46p multiplet after photoexcitation of the Xe*4d5/2-16p(J*=1) resonance by linearly and circularly polarized synchrotron radiation. Combination with data on the angular distribution and spin polarization of the Auger electrons, providing information on the relative phases of the amplitudes, constitutes the complete experiment on the Auger decay. Multiconfiguration relativistic calculations of the amplitudes have been performed and compared to the measurements.

O'Keeffe, P.; Aloïse, S.; Fritzsche, S.; Lohmann, B.; Kleiman, U.; Meyer, M.; Grum-Grzhimailo, A. N.

2004-07-01

125

From high-mass starless cores to high-mass protostellar objects  

NASA Astrophysics Data System (ADS)

Aims: Our aim is to understand the evolutionary sequence of high-mass star formation from the earliest evolutionary stage of high-mass starless cores, via high-mass cores with embedded low- to intermediate-mass objects, to finally high-mass protostellar objects. Methods: Herschel far-infrared PACS and SPIRE observations are combined with existing data at longer and shorter wavelengths to characterize the spectral and physical evolution of massive star-forming regions. Results: The new Herschel images spectacularly show the evolution of the youngest and cold high-mass star-forming regions from mid-infrared shadows on the Wien-side of the spectral energy distribution (SED), via structures almost lost in the background emission around 100 ?m, to strong emission sources at the Rayleigh-Jeans tail. Fits of the SEDs for four exemplary regions covering evolutionary stages from high-mass starless cores to high-mass protostellar objects reveal that the youngest regions can be fitted by single-component black-bodies with temperatures on the order of 17 K. More evolved regions show mid-infrared excess emission from an additional warmer component, which however barely contributes to the total luminosities for the youngest regions. Exceptionally low values of the ratio between bolometric and submm luminosity additionally support the youth of the infrared-dark sources. Conclusions: The Herschel observations reveal the spectral and physical properties of young high-mass star-forming regions in detail. The data clearly outline the evolutionary sequence in the images and SEDs. Future work on larger samples as well as incorporating full radiative transfer calculations will characterize the physical nature at the onset of massive star formation in even more depth. Herschel is an ESA space observatory with science instruments provided by Principal Investigator consortia. It is open for proposals for observing time from the worldwide astronomical community.

Beuther, H.; Henning, Th.; Linz, H.; Krause, O.; Nielbock, M.; Steinacker, J.

2010-07-01

126

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

SciTech Connect

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.

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

127

Resonance  

NSDL National Science Digital Library

For advanced undergraduate students: Observe resonance in a collection of driven, damped harmonic oscillators. Vary the driving frequency and amplitude, the damping constant, and the mass and spring constant of each resonator. Notice the long-lived transients when damping is small, and observe the phase change for resonators above and below resonance.

Simulations, Phet I.; Dubson, Michael; Loeblein, Patricia; Olson, Jonathan; Perkins, Kathy; Gratny, Mindy

2011-07-20

128

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

SciTech Connect

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 up to 2 GeV) decays to spectra, interferometry volumes, and phase-space densities are calculated and discussed in detail. The estimates of average phase-space densities and chemical potentials of thermal pions are obtained for SPS and RHIC energies. They demonstrate that multibosonic phenomena at those energies might be considered as a correction factor rather than as a significant physical effect. The analysis of the evolution of the pion average phase-space density in chemically frozen hadron systems shows that it is almost constant or slightly increases with time while the particle density and phase-space density at each space point decreases rapidly during the system's expansion. We found that, unlike the particle density, the average phase-space density has no direct link to the freeze-out criterion and final thermodynamic parameters, being connected rather to the initial phase-space density of hadronic matter formed in relativistic nucleus-nucleus collisions.

Akkelin, S.V.; Sinyukov, Yu.M. [Bogolyubov Institute for Theoretical Physics, Kiev 03143, Metrologichna 14b (Ukraine)

2004-12-01

129

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

SciTech Connect

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.

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

130

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

SciTech Connect

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.

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

1999-12-15

131

Resonant Auger decay of Xe* 4 d -1 5\\/2 6p : A contribution to the complete experiment from fluorescence polarization studies  

Microsoft Academic Search

Fluorescence polarimetry has been used to determine the relative partial-wave Auger decay widths for transitions to states of the XeII 5p46p multiplet after photoexcitation of the Xe*4d5\\/2-16p(J*=1) resonance by linearly and circularly polarized synchrotron radiation. Combination with data on the angular distribution and spin polarization of the Auger electrons, providing information on the relative phases of the amplitudes, constitutes the

P. O'Keeffe; S. Aloiese; S. Fritzsche; B. Lohmann; U. Kleiman; M. Meyer; A. N. Grum-Grzhimailo

2004-01-01

132

Polarization analysis of fluorescence probing the alignment of Xe+ ions in the resonant Auger decay of the Xe* 4d-15\\/26p photoexcited state  

Microsoft Academic Search

Xe II fluorescence, following the resonant Auger decay of the Xe* 4d-15\\/26p photoexcited state, has been measured in the wavelength region 400 nm <=lambda (fluo) <=610 nm by means of dispersed fluorescence spectroscopy, and the degree of linear polarization of the emitted light has been analyzed. From these data, the alignment of the ionic 5p46p states produced by the Auger

M. Meyer; A. Marquette; A. N. Grum-Grzhimailo; U. Kleiman; B. Lohmann

2001-01-01

133

Analysis of neutral-D decays to a charged kaon, a charged pion, and a neutral pion: Search for neutral-D mixing, and measurements of the doubly Cabibbo-suppressed decay rate and resonance contributions  

NASA Astrophysics Data System (ADS)

Analyzing D0 ? K +pi-pi0 decays, herein are presented the methods and results of a search for D0- D¯0 mixing, a measurement of the branching ratio R ? Gamma(D0 ? K+pi-pi0)/Gamma( D0 ? K-pi +pi0), and measurements of the contributions from D0 ? K+pi -, K*+pi-, K*0pi0; 230.4fb-1 of data collected from the BABAR detector at the PEP-II collider during 2000-2004 (Runs 1-4) are analyzed. An event-level tagging technique is developed, which facilitates the accurate determination of doubly Cabibbo-suppressed resonance contributions by suppressing background from Cabibbo-favored decays. The branching ratio is measured as R = (0.214 +/- 0.008 (stat)+/-0.008 (syst))%, with (46.1+/-3.3 (stat)+/-2.9 (syst))% of D0 ? K+pi -pi0 decays proceeding through the channel D0 ? K*+pi -. The data are consistent with the null-D-mixing hypothesis at a confidence level of 10%, and the expected value of +/- x2+y2 is measured as -0.013 +/- 0.010 (stat), indicating negative interference between mixing and doubly Cabibbo-suppressed decay. The expected value of the integrated mixing rate is (x2 + y2)/2 = (0.013 +/- 0.013 (stat))%.

Wilson, Michael Galante

134

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

NASA Astrophysics Data System (ADS)

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=7TeV corresponding to an integrated luminosity of 5.0fb-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'<1.3TeV for ?Z'=0.012MZ', and M<1.9TeV for ?Z'=0.10MZ'.

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., Jr.; 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.

2013-04-01

135

Excitation and Photon Decay of Giant Multipole Resonances - the Role and Future of Medium-Energy Heavy Ions.  

National Technical Information Service (NTIS)

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...

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

1988-01-01

136

Resonance  

NSDL National Science Digital Library

All About Circuits is a website that âÂÂprovides 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).

Kuphaldt, Tony R.

2008-07-07

137

Propagation of non-resonant temporal raman solitons in the presence of coherence decay: A perturbation theoretical analysis  

NASA Astrophysics Data System (ADS)

The propagation of a soliton in a Raman medium in the presence of collisional decay of coherence and detuning from Raman line center is studied. The spatial dependence of soliton width, position and amplitude is calculated by treating the decay of coherence as a perturbation. Two approaches are used, one based onthe inverse scattering transform and the other employing constants of motion. Both give identical results which are confirmed through the numerical integration of the equations of Raman scattering. These results confirm the phenomena of soliton narrowing and decay, which have been observed experimentally. Current address: RDA Associates, 2301 Yale Blvd., Building F, Albuquerque, NM 87206, USA.

Yousaf, M.; Druhl, K. J.; Shakir, S. A.

1988-02-01

138

Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions  

SciTech Connect

Analyzing D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays, herein are presented the methods and results of a search for D{sup 0}-{bar D}{sup 0} mixing, a measurement of the branching ratio R {equivalent_to} {Lambda}(D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}{pi}{sup 0}), and measurements of the contributions from D{sup 0} {yields} K{sup +}{rho}{sup -}, K*{sup +}{pi}{sup -}, K*{sup 0}{pi}{sup 0}; 230.4 fb{sup -1} of data collected from the BABAR detector at the PEP-II collider during 2000-2004 (Runs 1-4) are analyzed. An event-level tagging technique is developed, which facilitates the accurate determination of doubly Cabibbo-suppressed resonance contributions by suppressing background from Cabibbo-favored decays. The branching ratio is measured as R = (0.214 {+-} 0.008 (stat) {+-} 0.008 (syst))%, with (46.1 {+-} 3.3 (stat) {+-} 2.9 (syst))% of D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays proceeding through the channel D{sup 0} {yields} K*{sup +}{pi}{sup -}. The data are consistent with the null-D-mixing hypothesis at a confidence level of 10%, and the expected value of {+-} {radical}(x{sup 2} + y{sup 2}) is measured as -0.013 {+-} 0.010 (stat), indicating negative interference between mixing and doubly Cabibbo-suppressed decay. The expected value of the integrated mixing rate is (x{sup 2} + y{sup 2})/2 = (0.013 {+-} 0.013 (stat))%.

Wilson, Michael Galante

2005-12-13

139

Angle-resolved electron spectroscopy of the resonant Auger decay in xenon with meV energy resolution  

Microsoft Academic Search

The angle-resolved resonant Auger spectrum of Xe is investigated with a record high meV energy resolution in the kinetic energy region of 34.45-39.20 eV at hnu=65.110 eV, corresponding to the resonant excitation of the Auger Xe* 4d5\\/2-16p state. New lines have been observed and assigned in the spectra. The results of previous measurements concerning energies, intensities and angular distribution asymmetry

Johan Söderström; Andreas Lindblad; Alexei N. Grum-Grzhimailo; Oksana Travnikova; Christophe Nicolas; Svante Svensson; Catalin Miron

2011-01-01

140

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

SciTech Connect

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.

Benitez, Jose

2012-03-15

141

Search for a heavy resonance decaying into a Z+jet final state in pp¯ collisions at s=1.96TeV using the D0 detector  

Microsoft Academic Search

We have searched for a heavy resonance decaying into a Z+jet final state in pp¯ collisions at a center of mass energy of 1.96TeV at the Fermilab Tevatron collider using the D0 detector. No indication for such a resonance was found in a data sample corresponding to an integrated luminosity of 370pb-1. We set upper limits on the cross section

V. M. Abazov; B. Abbott; M. Abolins; B. S. Acharya; M. Adams; T. Adams; M. Agelou; J.-L. Agram; S. H. Ahn; M. Ahsan; G. D. Alexeev; G. Alkhazov; A. Alton; G. Alverson; G. A. Alves; M. Anastasoaie; T. Andeen; S. Anderson; B. Andrieu; M. S. Anzelc; Y. Arnoud; M. Arov; A. Askew; B. Åsman; A. C. S. Assis Jesus; O. Atramentov; C. Autermann; C. Avila; C. Ay; F. Badaud; A. Baden; L. Bagby; B. Baldin; D. V. Bandurin; P. Banerjee; S. Banerjee; E. Barberis; P. Bargassa; P. Baringer; C. Barnes; J. Barreto; J. F. Bartlett; U. Bassler; D. Bauer; A. Bean; M. Begalli; M. Begel; C. Belanger-Champagne; L. Bellantoni; A. Bellavance; J. A. Benitez; S. B. Beri; G. Bernardi; R. Bernhard; L. Berntzon; I. Bertram; M. Besançon; R. Beuselinck; V. A. Bezzubov; P. C. Bhat; V. Bhatnagar; M. Binder; C. Biscarat; K. M. Black; I. Blackler; G. Blazey; F. Blekman; S. Blessing; D. Bloch; K. Bloom; U. Blumenschein; A. Boehnlein; O. Boeriu; T. A. Bolton; F. Borcherding; G. Borissov; K. Bos; T. Bose; A. Brandt; R. Brock; G. Brooijmans; A. Bross; D. Brown; N. J. Buchanan; D. Buchholz; M. Buehler; V. Buescher; S. Burdin; S. Burke; T. H. Burnett; E. Busato; C. P. Buszello; J. M. Butler; P. Calfayan; S. Calvet; J. Cammin; S. Caron; W. Carvalho; B. C. K. Casey; N. M. Cason; H. Castilla-Valdez; S. Chakrabarti; D. Chakraborty; K. M. Chan; A. Chandra; D. Chapin; F. Charles; E. Cheu; F. Chevallier; D. K. Cho; S. Choi; B. Choudhary; L. Christofek; D. Claes; B. Clément; C. Clément; Y. Coadou; M. Cooke; W. E. Cooper; D. Coppage; M. Corcoran; M.-C. Cousinou; B. Cox; S. Crépé-Renaudin; D. Cutts; M. Cwiok; H. da Motta; A. Das; M. Das; B. Davies; G. Davies; G. A. Davis; K. de; P. de Jong; S. J. de Jong; E. De La Cruz-Burelo; C. De Oliveira Martins; J. D. Degenhardt; F. Déliot; M. Demarteau; R. Demina; P. Demine; D. Denisov; S. P. Denisov; S. Desai; H. T. Diehl; M. Diesburg; M. Doidge; A. Dominguez; H. Dong; L. V. Dudko; L. Duflot; S. R. Dugad; A. Duperrin; J. Dyer; A. Dyshkant; M. Eads; D. Edmunds; T. Edwards; J. Ellison; J. Elmsheuser; V. D. Elvira; S. Eno; P. Ermolov; J. Estrada; H. Evans; A. Evdokimov; V. N. Evdokimov; S. N. Fatakia; L. Feligioni; A. V. Ferapontov; T. Ferbel; F. Fiedler; F. Filthaut; W. Fisher; H. E. Fisk; I. Fleck; M. Ford; M. Fortner; H. Fox; S. Fu; S. Fuess; T. Gadfort; C. F. Galea; E. Gallas; E. Galyaev; C. Garcia; A. Garcia-Bellido; J. Gardner; V. Gavrilov; A. Gay; P. Gay; D. Gelé; R. Gelhaus; C. E. Gerber; Y. Gershtein; D. Gillberg; G. Ginther; N. Gollub; B. Gómez; K. Gounder; A. Goussiou; P. D. Grannis; H. Greenlee; Z. D. Greenwood; E. M. Gregores; G. Grenier; Ph. Gris; J.-F. Grivaz; 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. Hanagaki; 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; G. Hesketh; M. D. Hildreth; R. Hirosky; J. D. Hobbs; B. Hoeneisen; H. Hoeth; M. Hohlfeld; S. J. Hong; R. Hooper; 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; A. Jenkins; R. Jesik; K. Johns; C. Johnson; M. Johnson; A. Jonckheere; P. Jonsson; A. Juste; D. Käfer; S. Kahn; E. Kajfasz; A. M. Kalinin; J. M. Kalk; J. R. Kalk; S. Kappler; D. Karmanov; J. Kasper; P. Kasper; I. Katsanos; D. Kau; R. Kaur; R. Kehoe; S. Kermiche; S. Kesisoglou; N. Khalatyan; A. Khanov; A. Kharchilava; Y. M. Kharzheev; D. Khatidze; H. Kim; T. J. Kim; M. H. Kirby; B. Klima; J. M. Kohli; J.-P. Konrath; M. Kopal; V. M. Korablev; J. Kotcher; B. Kothari; A. Koubarovsky; A. V. Kozelov; J. Kozminski; A. Kryemadhi; S. Krzywdzinski; T. Kuhl; A. Kumar; S. Kunori; A. Kupco; T. Kurca; J. Kvita; S. Lager; S. Lammers; G. Landsberg; J. Lazoflores; A.-C. Le Bihan; P. Lebrun; W. M. Lee; A. Leflat; F. Lehner; V. Lesne; J. Leveque; P. Lewis; J. Li; Q. Z. Li; J. G. R. Lima; D. Lincoln; J. Linnemann; V. V. Lipaev; R. Lipton; Z. Liu; L. Lobo; A. Lobodenko; M. Lokajicek; A. Lounis; P. Love; H. J. Lubatti; M. Lynker; A. L. Lyon; A. K. A. Maciel; R. J. Madaras; P. Mättig; C. Magass; A. Magerkurth; A.-M. Magnan; N. Makovec; P. K. Mal; H. B. Malbouisson; S. Malik; V. L. Malyshev; H. S. Mao; Y. Maravin; M. Martens; S. E. K. Mattingly; R. McCarthy; R. McCroskey; D. Meder; A. Melnitchouk; A. Mendes; L. Mendoza; M. Merkin; K. W. Merritt; A. Meyer; J. Meyer; M. Michaut; H. Miettinen; T. Millet; J. Mitrevski; J. Molina; N. K. Mondal; J. Monk; R. W. Moore; T. Moulik; G. S. Muanza; M. Mulders; M. Mulhearn; L. Mundim; Y. D. Mutaf; E. Nagy; M. Naimuddin; M. Narain; N. A. Naumann; H. A. Neal; J. P. Negret; S. Nelson; P. Neustroev; C. Noeding; A. Nomerotski; S. F. Novaes; T. Nunnemann; V. O'Dell; D. C. O'Neil; G. Obrant; V. Oguri; N. Oliveira; N. Oshima; R. Otec

2006-01-01

142

Two pion decay of electroproduced light quark baryon resonances at Jefferson Laboratory: Experimental perspectives and data analysis  

SciTech Connect

In the framework of the AIACE[1]-CLAS[2] collaboration, the reaction eN ? e?N?? will be used in the mass region between threshold and 2.2 GeV both to investigate poorly known baryon resonances and to search for ?missing? resonances predicted by quark models but not yet found experimentally. Using the CEBAF Large Acceptance Spectrometer CLAS, the hadronic products will be detected in coincidence with the scattered electron. Differential cross sections and perhaps partial wave amplitudes for quasi-two-body iso-bar production could be extracted. Other quantities of physical interest like meson form factors are then briefly discussed.

M. Ripani

1997-09-01

143

Angle-resolved electron spectroscopy of the resonant Auger decay in xenon with meV energy resolution  

NASA Astrophysics Data System (ADS)

The angle-resolved resonant Auger spectrum of Xe is investigated with a record high meV energy resolution in the kinetic energy region of 34.45-39.20 eV at h?=65.110 eV, corresponding to the resonant excitation of the Auger Xe* 4d5/2-16p state. New lines have been observed and assigned in the spectra. The results of previous measurements concerning energies, intensities and angular distribution asymmetry parameters have been refined, complemented and, for some of the lines, corrected.

Söderström, Johan; Lindblad, Andreas; Grum-Grzhimailo, Alexei N.; Travnikova, Oksana; Nicolas, Christophe; Svensson, Svante; Miron, Catalin

2011-07-01

144

First observation and measurement of the resonant structure of the lambda_b->lambda_c pi-pi+pi- decay mode  

SciTech Connect

The authors present the first observation of the {Lambda}{sub b}{sup 0} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -} decay using data from an integrated luminosity of approximately 2.4 fb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV, collected with the CDF II detector at the Fermilab Tevatron. They also present the first observation of the resonant decays {Lambda}{sub b}{sup 0} {yields} {Sigma}{sub c}(2455){sup 0} {pi}{sup +}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, {Lambda}{sub b}{sup 0} {yields} {Sigma}{sub c}(2455){sup ++}{pi}{sup -}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, {Lambda}{sub b}{sup 0} {yields} {Lambda}{sub c}(2595){sup +}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -} and {Lambda}{sub b}{sup 0} {yields} {Lambda}{sub c}(2625){sup +}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, and measure their relative branching ratios.

Azzurri, P.; Barria, P.; Ciocci, M.A.; Donati, S.; Vataga, E.

2009-12-01

145

Inferring the High Mass Stellar IMF in M31  

NASA Astrophysics Data System (ADS)

I will present results from our ongoing study of the high mass stellar initial mass function (IMF) in M31. I will review the probabilistic technique for inferring the present day mass function (MF) of a resolved young star cluster that avoids many of challenges associated traditional IMF studies (e.g., binning of data, observational completeness), and show how this technique can robustly provide constraints on the high mass IMF. I will show preliminary MF measurements for select young clusters observed with PHAT, and discuss progress toward a secure high mass IMF determination in M31 using ~ 1000 young resolved star clusters.

Weisz, Daniel R.; Fouesneau, M.; Hogg, D. W.; Rix, H.; Dolphin, A. E.; Dalcanton, J.; Lang, D.; Johnson, L. C.; Beerman, L.; Bell, E. F.; Gordon, K. D.; Gouliermis, D.; Kalirai, J. S.; Skillman, E. D.; Williams, B. F.; PHAT Team

2013-01-01

146

6{alpha}-cluster resonance structures in {sup 12}C+{sup 12}C system and their decay in {alpha} and {sup 8}Be channels  

SciTech Connect

The excitation functions have been measured for the {sup 12}C ({sup 12}C,{alpha}){sup 20}Ne and {sup 12}C({sup 12}C,{sup 8}Be){sup 16}O reactions leading to the excited states up to 25 MeV in {sup 20}Ne and 20 MeV in {sup 16}O, respectively, in the beam energy range E({sup 12}C)=48{endash}72 MeV. The region of excitation investigated was E{sub x}=38{endash}50 MeV in {sup 24}Mg which is well above the threshold for breakup into six alpha particles. In the {sup 8}Be channel leading to the 6{endash}7 MeV region of {sup 16}O, excitation functions were also measured for {sup 8}Be- {gamma} coincidences in {sup 12}C ({sup 12}C,{sup 8}Be){sup 16}O{sup *}{r_arrow}{gamma}+{sup 16}O{sub g.s.} particularly to distinguish between the otherwise unresolved 6.05 MeV, 0{sup +} and 6.13 MeV, 3{sup {minus}} states in {sup 16}O. It is observed that a cluster of resonances in the excitation region 39{endash}43 MeV in {sup 24}Mg decays via {alpha} and {sup 8}Be channels predominantly to the particle-hole states in {sup 20}Ne and {sup 16}O which are members of deformed bands. Another cluster of resonances in the region 44{endash}49 MeV (centered at E{sub c.m.}=32.5 MeV) decays predominantly to the 20.48 MeV state in {sup 20}Ne (which is above the 5{alpha} breakup threshold) and to a possible 4{alpha} linear chain band in {sup 16}O around 18 MeV, indicating their highly deformed nature. This latter cluster structure coincides in energy with the possible 6{alpha} linear chain resonance identified in the literature at E{sub c.m.}=32.5 MeV in the inelastic scattering channels {sup 12}C{sub 7.65,0{sup +}}+{sup 12}C{sub 7.65,0{sup +}} and {sup 12}C{sub 7.65,0{sup +}}+{sup 12}C{sub 9.64,3{sup {minus}}}. In this excitation energy region intermediate structures in the {sup 8}Be channel are found at E{sub c.m.}=31.5 and 33.5 MeV decaying to the 6.13 MeV, 3{sup {minus}} state and at E{sub c.m.}=32.5 MeV decaying to the 6.92/7.13 MeV states of {sup 16}O. (Abstract Truncated)

Mirgule, E.T.; Eswaran, M.A.; Kumar, S.; Chakrabarty, D.R.; Datar, V.M.; Pal, U.K.; Oza, H.H.; Ragoowansi, N.L. [Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, 400 085 (India)

1997-10-01

147

Creation of entangled photons by two level atom trapped in one-dimensional nanocavity with weakly decaying resonance mode  

NASA Astrophysics Data System (ADS)

The entangled photons components are found to be created in the lossless nanocavity with resonance mode. The smallness of ? ( 0 <= ?<< g- coupling constant for electro-dipolar interaction) was revealed playing the crucial part in their production. It's known that ? determines limits (?c +/- ?) of photon frequency deflection from the mode frequency ?c, when photon passes through empty cavity. When ? = 0 and ?a=?c , the Hamiltonian is time independent and has two eigenstates with eigenvalies (?a +/- g). Each state is superposition of the upper and lower atomic states, taken with signs plus and minus respectively. These states are stationary and form a time-depended superposition. Matrix elements of the interaction Hamiltonian, taken between that superposition and atomic unperturbed states, contain two anti-phases components of entangled photons. Since ? = 0, their emission out of cavity is forbidden so they interfere, producing beatings of the resonance mode by sin (g•t). When 0 < ?<< g those beatings become quasi-stationary, and with probability proportional to ?/4g they go out through the partly transparent mirror and disintegrate into two photons, each of them taking its own spectral place outside the cavity. This process is illustrated by 3D-plots in the (?, t)-space.

Cheltsov, Vladislav

2013-05-01

148

Resonant Auger decay of Xe{sup *} 4d{sub 5/2}{sup -1}6p: A contribution to the complete experiment from fluorescence polarization studies  

SciTech Connect

Fluorescence polarimetry has been used to determine the relative partial-wave Auger decay widths for transitions to states of the Xe II 5p{sup 4}6p multiplet after photoexcitation of the Xe{sup *} 4d{sub 5/2}{sup -1}6p(J{sup *}=1) resonance by linearly and circularly polarized synchrotron radiation. Combination with data on the angular distribution and spin polarization of the Auger electrons, providing information on the relative phases of the amplitudes, constitutes the complete experiment on the Auger decay. Multiconfiguration relativistic calculations of the amplitudes have been performed and compared to the measurements.

O'Keeffe, P. [LURE, Centre Universitaire Paris--Sud, Batiment 209D, F-91898 Orsay Cedex (France); Aloiese, S.; Meyer, M. [LURE, Centre Universitaire Paris--Sud, Batiment 209D, F-91898 Orsay Cedex (France); CEA/DRECAM/SPAM, CEN Saclay, F-91105 Gif-sur-Yvette (France); Fritzsche, S. [Fachbereich Physik, Universitaet Kassel, Heinrich-Plett Strasse 40, D-34132 Kassel (Germany); Lohmann, B. [Institut fuer Theoretische Physik, Westfaelische Wilhelms-Universitaet Muenster, Wilhelm-Klemm-Strasse 9, D-48149 Muenster (Germany); Kleiman, U. [Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin (Germany); Grum-Grzhimailo, A. N. [LURE, Centre Universitaire Paris--Sud, Batiment 209D, F-91898 Orsay Cedex (France); Institute of Nuclear Physics, Moscow State University, Moscow 119899 (Russian Federation)

2004-07-01

149

Observation of a narrow resonance of mass 2.46 GeV\\/c2 decaying to D*+spi0 and confirmation of the D*sJ(2317) state  

Microsoft Academic Search

Using 13.5 fb-1 of e+e- annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to Ds*+pi0 with a mass near 2.46GeV\\/c2. The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at 2.32GeV\\/c2, the DsJ*(2317)+, that decays to Ds+pi0. Reconstructing the Ds+pi0 and Ds*+pi0

D. Besson; S. Anderson; V. V. Frolov; D. T. Gong; Y. Kubota; S. Z. Li; R. Poling; A. Smith; C. J. Stepaniak; J. Urheim; Z. Metreveli; K. K. Seth; A. Tomaradze; P. Zweber; K. Arms; E. Eckhart; K. K. Gan; C. Gwon; T. K. Pedlar; E. von Toerne; H. Severini; P. Skubic; S. A. Dytman; J. A. Mueller; S. Nam; V. Savinov; J. W. Hinson; G. S. Huang; J. Lee; D. H. Miller; V. Pavlunin; B. Sanghi; E. I. Shibata; I. P. J. Shipsey; D. Cronin-Hennessy; C. S. Park; J. B. Thayer; E. H. Thorndike; T. E. Coan; Y. S. Gao; F. Liu; R. Stroynowski; M. Artuso; C. Boulahouache; S. Blusk; E. Dambasuren; O. Dorjkhaidav; H. Muramatsu; R. Nandakumar; T. Skwarnicki; S. Stone; J. C. Wang; A. H. Mahmood; S. E. Csorna; I. Danko; G. Bonvicini; D. Cinabro; M. Dubrovin; S. McGee; A. Bornheim; E. Lipeles; S. P. Pappas; A. Shapiro; W. M. Sun; A. J. Weinstein; R. A. Briere; G. P. Chen; T. Ferguson; G. Tatishvili; H. Vogel; M. E. Watkins; N. E. Adam; J. P. Alexander; K. Berkelman; V. Boisvert; D. G. Cassel; J. E. Duboscq; K. M. Ecklund; R. Ehrlich; R. S. Galik; L. Gibbons; B. Gittelman; S. W. Gray; D. L. Hartill; B. K. Heltsley; L. Hsu; C. D. Jones; J. Kandaswamy; D. L. Kreinick; A. Magerkurth; H. Mahlke-Krüger; T. O. Meyer; N. B. Mistry; J. R. Patterson; D. Peterson; J. Pivarski; S. J. Richichi; D. Riley; A. J. Sadoff; H. Schwarthoff; M. R. Shepherd; J. G. Thayer; D. Urner; T. Wilksen; A. Warburton; M. Weinberger; S. B. Athar; P. Avery; L. Breva-Newell; V. Potlia; H. Stoeck; J. Yelton; B. I. Eisenstein; G. D. Gollin; I. Karliner; N. Lowrey; C. Plager; C. Sedlack; M. Selen; J. J. Thaler; J. Williams; K. W. Edwards

2003-01-01

150

Measured hot-electron intensity thresholds quantified by a two-plasmon-decay resonant common-wave gain in various experimental configurations  

NASA Astrophysics Data System (ADS)

The fraction of laser energy converted into hot electrons by the two-plasmon-decay instability is found to have different overlapped intensity thresholds for various configurations on the Omega Laser Facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997); J. H. Kelly et al., J. Phys. IV 133, 75 (2006)]. A factor-of-2 difference in the overlapped intensity threshold is observed between two- and four-beam configurations. The overlapped intensity threshold increases by a factor of 2 between the 4- and 18-beam configurations and by a factor of 3 between the 4- and 60-beam configurations. This is explained by a linear common-wave model where multiple laser beams drive a common electron-plasma wave in a wavevector region that bisects the laser beams (resonant common-wave region in k-space). These experimental results indicate that the hot-electron threshold depends on the hydrodynamic parameters at the quarter-critical density surface, the configuration of the laser beams, and the sum of the intensity of the beams that share the same angle with the common-wave vector.

Michel, D. T.; Maximov, A. V.; Short, R. W.; Delettrez, J. A.; Edgell, D.; Hu, S. X.; Igumenshchev, I. V.; Myatt, J. F.; Solodov, A. A.; Stoeckl, C.; Yaakobi, B.; Froula, D. H.

2013-05-01

151

Magnetic Field Structure in High-Mass Star Formation Regions.  

National Technical Information Service (NTIS)

We present a preliminary analysis of far-IR polarimetric observations, which were made to study the magnetic field structure in the high-mass star formation regions of M42, NGC2024, and W3. These observations were made from the Kuiper Airborne Observatory...

J. A. Davidson D. Schleuning J. L. Dotson C. D. Dowell R. H. Hildebrand

1995-01-01

152

INNOVATIVE ENERGY ABSORBING MOUNTING SYSTEMS FOR HIGH MASS ROTORCRAFT PAYLOADS  

Microsoft Academic Search

This paper presents recent developments on two innovative types of crashworthy cargo restraints for high mass rotorcraft payloads: textile-based devices and flexible matrix composite devices. Each type of device employs energy dissipation mechanisms to arrest the motion of payloads and limit the maximum load transmitted to tie-down points, thereby maintaining control over payload motion and improving crew survivability in the

William Kong; Chandrashekhar Tiwari; Matthew J. Hagon; Charles E. Bakis; Edward C. Smith; Michael A. Yukish

153

Searches for a High Mass Higgs Boson at the Tevatron  

Microsoft Academic Search

Recent results obtained by the CDF and D0 collaborations are presented here. These Tevatron Higgs searches look for a Standard Model (SM) Higgs boson decaying into W-boson pairs, with the W-bosons decaying into electron-neutrino or muon neutrino final states. In the mass range of 135 GeV\\/c2 to 200 Gev\\/c2, the SM Higgs decays prominently into W-boson pairs. The presented results

D. Benjamin; for the CDF

2009-01-01

154

Viscous timescale in high mass X-ray binaries  

NASA Astrophysics Data System (ADS)

Context. Low mass X-ray binaries are found to have very low frequency breaks in their power density spectra. The power density spectra below these breaks are nearly in white noise structure and at higher frequencies approximately follow the P? ? ?-1.3 law. Aims: To determine whether high mass X-ray binary power density spectra have similar properties and the findings for low mass X-ray binaries are also valid for high mass binaries, we analyzed the time series of high mass X-ray binary sources produced by All Sky Monitor of Rossi X-ray Timing Explorer. Methods: We obtained the power density spectra of the high mass X-ray binaries using the cosine transform of autocorrelation function. Results: We identified break frequencies for seven sources, namely OAO 1657-415, SS 433, Vela X-1, SMC X-1, 4U 1700-377, GX 301-2, and LMC X-1. The normalized break frequencies with respect to the orbital frequency (fbreak/forbit) for sources OAO 1657-415, SS 433, SMC X-1 and LMC X-1 are consistent with those of Roche lobe overflow systems. The other high mass X-ray binary systems, Vela X-1, GX 301-2, and 4U 1700-377, however, have larger break frequency ratios, fbreak/forb, which are indicative of short viscous times. These are all wind-accreting sources and the stellar winds in the systems allow the formation of only short radius discs. Consequently, we qualitatively distinguished the Roche lobe overflow binaries from the wind accreting system by comparing their normalized break frequencies.

Içdem, B.; Baykal, A.

2011-05-01

155

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

PubMed

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

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

2011-12-29

156

Contribution of low-lying vector resonances to polarization observables in B{sub d}{sup 0}{yields}K{sup *0}e{sup +}e{sup -} decay  

SciTech Connect

The branching ratio and other observables for the rare flavor-changing neutral current decay B{sub d}{sup 0}{yields}K{sup *0}({yields}K{sup -}{pi}{sup +})e{sup +}e{sup -} are studied below the cc threshold. The total amplitude for this decay includes the term coming from the standard model effective Hamiltonian and the term generated by the processes B{sub d}{sup 0}{yields}K{sup *0}({yields}K{sup -}{pi}{sup +})V with intermediate low-lying vector resonances V={rho}(770), {omega}(782), {phi}(1020) decaying into the e{sup +}e{sup -} pair. The resonance contribution to the branching ratio, polarization fractions of the K{sup *} meson, and coefficients in the angular distribution is calculated. The influence of the resonances on the integrated observables in the region of electron-positron invariant mass up to 1 GeV is studied in view of the planned measurements of the photon polarization at the LHCb.

Korchin, Alexander Yu.; Kovalchuk, Vladimir A. [NSC Kharkov Institute of Physics and Technology, 61108 Kharkov (Ukraine)

2010-08-01

157

Influence of the initial- and final-state configuration interaction on the anisotropy of the resonant Auger decay of Kr 3d-15p and Xe 4d-16p states  

NASA Astrophysics Data System (ADS)

The anisotropy of resonant Auger decay of photo-excited Kr 3d-13/2,5/25p and Xe 4d-13/2,5/26p states has been studied by multiconfiguration Dirac-Fock method. The calculations account for the configuration interaction both in the initial and in the final states of the Auger decay. For the nonresolved nd-1(n+2)p(J=1) resonances (n=3 for Kr and n=4 for Xe) the average intensities and anisotropies of Auger lines were calculated by weighing each partial rate by the pertinent Dirac-Fock photoexcitation probabilities. Our results show that, in addition to the initial- and final-state correlation, both the relaxation and the exchange interaction have a substantial effect on the anisotropy of these Auger spectra. For most Auger lines there is good agreement between our calculated ? parameters and experimental values for the Kr and Xe nd-15/2(n+2)p photoexcitation resonances; there is also satisfactory agreement for the Kr 3d-13/25p and Xe 4d-13/26p resonant Auger spectra. However, the remaining notable discrepancies between theory and experiment indicate that important correlation effects are still omitted in our calculations. Discrepancies between different experimental results stress the need for further improvements on the experimental side.

Tulkki, J.; Aksela, H.; Kabachnik, N. M.

1994-09-01

158

High-mass star-formation rates in M33  

SciTech Connect

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.

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

1991-04-01

159

EMP stars with high mass IMF and hierarchical galaxy formation  

NASA Astrophysics Data System (ADS)

Extremely metal-poor (EMP) stars in the Galactic halo are stars formed in the very early stage of the chemical evolution of the Galaxy. In previous study, we proposed that typical mass of EMP stars are massive, based on observations of carbon-enhanced EMP stars. In this study, we build a merger tree of the Galaxy semi-analytically and follow the chemical evolution along the merger tree. We also consider the effect of binary and high-mass initial mass function(IMF). Resultant theoretical metallicity distribution function (MDF) and abundance distribution are compared with observed metal-poor halo stars.

Komiya, Yutaka; Suda, Takuma; Habe, Asao; Fujimoto, Masayuki Y.

2010-03-01

160

Determination of the quarkonium--gluonium content of the isoscalar tensor resonances $f_2(1920)$, $f_2(2020)$, $f_2(2240)$, $f_2(2300)$ and of the broad state $f_2(2000)$ based on decay couplings to $\\\\pi^0\\\\pi^0,\\\\eta\\\\eta,\\\\eta\\\\eta'$  

Microsoft Academic Search

In the reactions $p\\\\bar p\\\\to\\\\pi^0\\\\pi^0,\\\\eta\\\\eta,\\\\eta\\\\eta'$ there are four relatively narrow resonances $f_2(1920)$, $f_2(2020)$, $f_2(2240)$, $f_2(2300)$, and a broad one $f_2(2000)$ in the mass region 1990--2400 MeV. In the framework of quark combinatorics we carry out an analysis of the decay constants for all five resonances. It is shown that the relations for the decay constants corresponding to the broad resonance

V. V. Anisovich; M. A. Matveev; J. Nyiri; A. V. Sarantsev

2005-01-01

161

Giant resonances: reaction theory approach.  

National Technical Information Service (NTIS)

The study of giant resonances through the use of reaction theory approach is presented and discussed. Measurements of cross-sections to the many available decay channels following excitation of giant multipole resonances (GMR) led one to view these phenom...

A. F. R. Toledo Piza G. A. Foglia

1989-01-01

162

NIR integral field spectroscopy of high mass young stellar objects  

NASA Astrophysics Data System (ADS)

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.

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

2013-03-01

163

Urban decay  

NSDL National Science Digital Library

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.

Peter Van den Bossche (None;)

2007-09-23

164

Strange decays of the tau lepton  

SciTech Connect

Measurements of hadronic {tau} decays to states containing at least one strange meson are reviewed. New results are presented from a self-consistent analysis of one-prong decays including kaons and from a study of the kaon content in three-prong decays. First observations of the resonance contribution to the strange axial-vector channel are reported. The findings are compared to model predictions of K{sub 1} mixing and interference in {tau} decay.

Ronan, M.T.

1992-12-01

165

Strange decays of the tau lepton  

SciTech Connect

Measurements of hadronic [tau] decays to states containing at least one strange meson are reviewed. New results are presented from a self-consistent analysis of one-prong decays including kaons and from a study of the kaon content in three-prong decays. First observations of the resonance contribution to the strange axial-vector channel are reported. The findings are compared to model predictions of K[sub 1] mixing and interference in [tau] decay.

Ronan, M.T.

1992-12-01

166

High Mass Resolution Plasma Mass Spectrometry of Cr Isotopes  

NASA Astrophysics Data System (ADS)

Natural mass dependent fractionation of Cr isotopes (masses 50, 52, 53 and 54) is associated with redox reactions (Ellis et al., 2002). In reduced aqueous solutions, chromium (VI) is converted to insoluble chromium (III), which is accompanied by a 3 permil isotope effect. Thus the isotopes of Cr may have wide applicability in the earth sciences as a tracer of redox conditions in the solid earth, oceans and atmosphere over time. Our approach for measuring Cr isotopes utilizes the resolving power of the Finnigan Neptune operated in high mass resolution mode. Using a small diameter, high resolution entrance slit and wide diameter collector slits, flat-topped peak shoulders representing the un-interfered Cr isotopes can be located during a mass scan on the low mass side of composite, interfered peaks. Setting the collectors and magnet field to measure on these peak shoulders, near the high mass edge of the Faraday collector, clips the interfering ion beam preventing it from entering the collector. The largest plasma-generated interference is 40Ar14N on mass 54, comprising about 18 percent of the ion bean intensity in a 1 ppm Cr solution. Molecular interferences on the other isotopes of Cr are less than 0.1 percent, and are negligible in >10ppm Cr solutions. All experiments utilize the Finnigan stable introduction system and a PFA microflow nebulizer. Preliminary results show that about 4 permil of the ArN interference on mass 54 remains despite the peak shoulder measurement. This may be due to peak tailing from the ArN interference, which is a composite peak with an additional interference on the low mass side that is part of the HNO3 blank, and may accentuate tailing of the 54Cr peak. The 4 permil effect is easily removed by performing a blank subtraction. Normalized to a 50/52 ratio of 0.051859, we obtained ratios of 0.113452 and 0.028223 on 53/52 and 54/52, respectively, in 3 to 10 ppm solutions. Results thus far show that a reproducibility of better than +/-50 ppm (2 standard deviations) on the 53/52 ratio is easily achieved from Cr solutions of 3 to 10 ppm. To measure natural Cr isotope variations in nature requires sample-standard-bracketing or double spike addition to correct for instrumental mass fractionation. Experiments with a 50-54 double spike are currently underway, and these results will also be reported. Ellis et al., Science, V. 295, p. 2060

Holmden, C.; Eglington, B. M.

2003-12-01

167

Fragmentation in High-Mass Star Forming Regions  

NASA Astrophysics Data System (ADS)

In the last decade, we have started to spatially resolve the relatively small gas and dust condensations in high-mass star-forming regions that will eventually become a massive star or system. We call these condensations of sizes on the order of 0.01 pc “cores”, and by estimating their masses we can construct the so-called Core Mass Function (CMF) of a region, to compare with the IMF and try to determine the evolutionary process from core to star. For massive star-forming regions, the relationship between the CMF and the IMF is not yet well understood. This is, among other factors, due to the fact that there are not many massive CMF determined. Even then, some of those few CMF seem to tell a story of evolution, by presenting different slopes than that of the Salpeter IMF while others, seem to be very similar to the IMF. In this work we show CMFs obtained for a group of massive star-forming regions with SMA and PdBI observations. These CMFs show different slopes, and we explain the possible significance this has on the evolution of the cores.

Rodón, J. A.; Beuther, H.; Schilke, P.; Zhang, Q.

2013-10-01

168

Hydrogen Fluoride in High-mass Star-forming Regions  

NASA Astrophysics Data System (ADS)

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 H2 of 1.5 × 10-8 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 × 10-10. 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 × 10-8) due to the desorption by sputtering. These observations provide further evidence that the chemistry of interstellar fluorine is controlled by freezeout onto gas grains.

Emprechtinger, M.; Monje, R. R.; van der Tak, F. F. S.; van der Wiel, M. H. D.; Lis, D. C.; Neufeld, D.; Phillips, T. G.; Ceccarelli, C.

2012-09-01

169

HYDROGEN FLUORIDE IN HIGH-MASS STAR-FORMING REGIONS  

SciTech Connect

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.

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

170

Cascade of the parametric decay instability in ionospheric heating experiments  

Microsoft Academic Search

Cascade of Langmuir waves excited by parametric decay instability (PDI) in ionospheric heating experiments is studied. In resonance cascade the mother Langmuir wave has to propagate downward to the resonant location of the daughter line for the resonant decay. To balance the propagation loss of the mother Langmuir wave, a large power ratio (~10 dB) between two consecutive cascade lines

S. P. Kuo

2001-01-01

171

Angle-resolved study of Ar 2p{sub 1/2,3/2}{sup {minus}1}ns,d resonant Auger decay  

SciTech Connect

Angle-resolved measurements of the Ar 2p{sub 1/2}{sup {minus}1}4s,3d,4d and 2p{sub 3/2}{sup {minus}1}4s,3d,4d resonant Auger transitions have been carried out using photons from an undulator beamline at the Advanced Light Source. The intensity distributions and angular distribution anisotropy ({beta}) parameters have been reported for nearly all of the possible 3p{sup 4}nl final ionic states. Our results further verify the predictions of the spectator model for the 2p{sub 1/2,3/2}{sup {minus}1}4s resonances and the subsequent breakdown of this model for the 2p{sub 1/2,3/2}{sup {minus}1}3d and 2p{sub 1/2,3/2}{sup {minus}1}4d relative intensities. No prior measurement of the resonant Auger {beta} parameters of the 2p{sub 1/2,3/2}{sup {minus}1}3d and 2p{sub 1/2,3/2}{sup {minus}1}4d resonances, and the intensity distribution for the 2p{sub 1/2}{sup {minus}1}4d resonance has been reported, to the best of our knowledge. Our results have been compared with previous experimental and theoretical results wherever possible. {copyright} {ital 1997} {ital The American Physical Society}

Farhat, A.; Humphrey, M.; Langer, B.; Berrah, N. [Physics Department, Western Michigan University, Kalamazoo, Michigan 49008 (United States); Bozek, J.D. [Lawrence Berkeley National Laboratory, Advanced Light Source, Mail Stop 2-400, Berkeley, California 94720 (United States); Cubaynes, D. [Laboratoire de Spectroscopie Atomique et Ionique, URA 775, CNRS, Universite Paris Sud, 91405 Orsay (France)

1997-07-01

172

Ultra-High-Mass Biomolecule Mass Spectrometry with Cryogenic Detectors  

NASA Astrophysics Data System (ADS)

We present experimental results obtained using a cryogenically-cooled Nb-Al_2O_3-Nb superconducting tunnel junction (STJ) detector operating at 1.3 K as an ion detector in a matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometer. As opposed to microchannel plate ion detectors (MCPs) commonly used in such systems, cryogenic detectors such as STJs offer a near 100 % detection efficiency for all ions including very massive, slow moving macromolecules. Our results indicate that for a molecular mass of 66,000 amu the STJ detector is 2-3 orders of magnitude more sensitive per unit area than a MCP. In addition, we show that the energy-resolving capability of a STJ detector can be used for charge discrimination, a feature not available with MCPs. The STJ detector produces pulses whose heights are approximately proportional to ion energy, thus the height of a pulse generated by the impact of a doubly-charged ion is about twice the height of a singly-charged ion pulse. This feature will be particularly valuable when other launching techniques, such as electrospray, are used which result in less fragmentation but produce a large variety of charge states. We also present the first results from a study of DNA repair proteins with mass spectrometry using STJ detectors and show how the high efficiency of STJ detectors for high-mass biomolecular ions can help to solve problems in structural biology. We discuss potential applications of this new detector technology in biotechnology, plastics engineering and environmental monitoring including DNA sizing and DNA sequencing, and measuring the mass of large polymers, aerosol droplets, dust particles and perhaps entire microorganisms.

Frank, Matthias

1998-03-01

173

Spin-lattice relaxation measurements by improved signal decay method  

Microsoft Academic Search

Spin-lattice relaxation time measurements in solids by decay of the absorption magnetic resonance signal are discribed. The signal decay method is improved by synchronization of the measurements to the trigger mechanism of a computer of average transients.

J. Stepisnik; J. Porok; V. Erzen

1970-01-01

174

Effect of the a{sub 1}(1260) resonance on the {rho} {sup {yields}} 4{pi} and {omega},o {sup {yields}} 5 {pi} decay widths  

SciTech Connect

The contribution of the a{sub 1}(1260) meson to the {rho}(770) {sup {yields}} 4{pi},{omega}(782) {sup {yields}} 5{pi}, and o(1020) {sup {yields}} 5{pi} decay amplitudes is analyzed on the basis of the chiral model of pseudoscalar, vector, and axial-vector mesons that is based on generalized hidden local symmetry and which is supplemented with terms induced by the Wess-Zumino anomaly. It is shown that the intensities of the above decays are enhanced upon taking into account the a{sub 1} meson in intermediate states. For the a{sub 1}-meson mass m{sub a{sub 1}} varying from 1.23 GeV to m{sub p}{radical}2=1.09 GeV, the enhancement factor grows from 1.3 to 1.9.

Achasov, N. N., E-mail: achasov@math.nsc.ru; Kozhevnikov, A. A. [Russian Academy of Sciences, Sobolev Institute of Mathematics, Siberian Division (Russian Federation)], E-mail: kozhev@math.nsc.ru

2006-02-15

175

Chiral Quirkonium Decays  

SciTech Connect

We calculate the two-body decay rates of quirkonium states formed from quirks that acquire mass solely through electroweak symmetry breaking. We consider SU(N){sub ic} infracolor with two flavors of quirks transforming under the electroweak group (but not QCD) of the standard model. In one case, the quirks are in a chiral representation of the electroweak group, while in the other case, a vectorlike representation. The differences in the dominant decay channels between 'chiral quirkonia' versus 'vectorlike quirkonia' are striking. Several chiral quirkonia states can decay into the unique two-body resonance channels WH, ZH, t{bar t}, t{bar b}/b{bar t}, and {gamma}H, which never dominate for vectorlike quirkonia. Additionally, the channels WW, WZ, ZZ, and W{gamma}, are shared among both chiral and vectorlike quirkonia. Resonances of dileptons or light quarks (dijets) can dominate for some vectorlike quirkonia states throughout their mass range, while these modes never dominate for chiral quirkonia unless the decays into pairs of gauge or Higgs bosons are kinematically forbidden.

Fok, R.; /Oregon U.; Kribs, Graham D.; /Fermilab

2011-06-01

176

Out of plane measurements of the decay neutron from the giant resonance in the 12C(e,e(')n)11C reaction  

PubMed

Out of plane measurements of the angular correlations for the 12C(e, e(')n) reaction have been performed for the first time in the giant resonance region. The cross sections were directly separated into the longitudinal and transverse, longitudinal-transverse, and transverse-transverse components. The cross section at the peak of the giant resonance ( omega = 22.5 MeV) has been found to be almost all longitudinal. It was reproduced by the multipole expansion with E0 and E2 components besides E1. The longitudinal-transverse component might have a maximum around 24 MeV. The transverse-transverse component is very small over the giant resonance. PMID:11018879

Oikawa; Saito; Takahisa; Suga; Kino; Nakagawa; Tohei; Abe; Ueno

2000-03-13

177

Standard model high mass Higgs search at CDF  

SciTech Connect

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.

Lucchesi, Donatella; /INFN, Padua

2010-01-01

178

Dalitz Plot Analyses of Charmless B Decays  

SciTech Connect

We present preliminary results of maximum-likelihood Dalitz plot analyses performed by the BABAR Collaboration of the charmless hadronic decays B{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0}, B{sup +} {yields} K{sup +}{pi}{sup -}{pi}{sup +}, and B{sup +} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup +}. We report inclusive decay rates, as well as fractions and phases for intermediate resonant decays.We also report CP-violating charge asymmetries for intermediate resonant decays of neutral B mesons.

Yu, Z.; /Wisconsin U., Madison

2005-10-26

179

Observation of the decay ?? ?? 0  

Microsoft Academic Search

The reaction e+e????0??+???0?0 has been studied with SND detector at VEPP-2M e+e? collider in the vicinity of the ? meson resonance. The observed interference pattern in the energy dependence of the cross section is consistent with existence of the decay ????0 with a branching ratio of B(????0)=(4.8+1.9?1.7±0.8)×10?5. The real and imaginary parts of the decay amplitude were measured. The ????0

M. N. Achasov; S. E. Baru; A. V. Berdyugin; A. V. Bozhenok; D. A. Bukin; S. V. Burdin; T. V. Dimova; S. I. Dolinsky; V. P. Druzhinin; M. S. Dubrovin; I. A. Gaponenko; V. B. Golubev; V. N. Ivanchenko; A. A. Korol; M. S. Korostelev; S. V. Koshuba; E. V. Pakhtusova; A. A. Polunin; E. E. Pyata; A. A. Salnikov; V. V. Shary; S. I. Serednyakov; Yu. M. Shatunov; V. A. Sidorov; A. N. Skrinsky; Z. K. Silagadze; Yu. S. Velikzhanin

1999-01-01

180

Configuration-interaction-induced dynamic spin polarization of the Ar*(2p{sub 1/2,3/2}{sup -1}4s{sub 1/2}){sub J=1} resonant Auger decay  

SciTech Connect

Spin-resolved measurements of the Ar{sup *}(2p{sub 1/2,3/2}{sup -1}4s{sub 1/2}){sub J=1} resonantly excited L{sub 2,3}M{sub 2,3}M{sub 2,3} Auger decay have been performed. The low resolution Auger spectrum, which due to cancellation between different multiplet components should exhibit virtually zero dynamic spin polarization, reveals an unexpected nonvanishing polarization effect. Calculations within a relativistic distorted wave approximation explain this effect as configuration-interaction (CI) induced. The CI generates experimentally unresolved fine structure components with low and high total angular momentum, giving rise to asymmetric cases where the high J part of certain multiplets is suppressed by internal selection rules for diagram lines. In this case, only the low J components survive with no partner for spin-polarization cancellation.

Lohmann, B. [Institut fuer Theoretische Physik, Westfaelische Wilhelms-Universitaet Muenster, Wilhelm-Klemm-Strasse 9, D-48149 Muenster (Germany); Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin (Germany); Langer, B. [Max-Born-Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, D-12489 Berlin (Germany); Snell, G.; Canton, S.; Berrah, N. [Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 (United States); Kleiman, U.; Becker, U. [Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin (Germany); Martins, M. [Institut fuer Experimentalphysik, Universitaet Hamburg, Luruper Chaussee 149, D-22761 Hamburg (Germany)

2005-02-01

181

INTEGRAL observation of the high-mass X-ray transient V 0332+53 during the 2005 outburst decline  

NASA Astrophysics Data System (ADS)

The decline of the high mass X-ray transient V 0332+53 during the Dec. 2004 to Feb. 2005 outburst is analysed from the data recorded by INTEGRAL. The flux is shown to decrease exponentially until 2005 Feb. 10, with a decay time scale of ~30 days above 20 keV and ~20 days at lower energies, and to decrease linearly thereafter. The energy spectrum is well modelled throughout the decay by a power law with a folding energy of ~7.5 keV, and with two cyclotron absorption features. The folding energy does not vary significantly over the decay, but the spectrum becomes harder with time. Most importantly, we show that the parameters describing the fundamental cyclotron line around 27 keV do vary with time: its energy and depth increase (by about 17% for the energy in ~6 weeks), while its width decreases. These changes of the cyclotron line parameters are interpreted as resulting from a change in the extent of the cyclotron scattering region. Two quasi-periodic oscillations are also observed at various times during the observations, one at 0.05 Hz and another one near the pulsation frequency around 0.23 Hz.

Mowlavi, N.; Kreykenbohm, I.; Shaw, S. E.; Pottschmidt, K.; Wilms, J.; Rodriguez, J.; Produit, N.; Soldi, S.; Larsson, S.; Dubath, P.

2006-05-01

182

Structure-function relationships in the 47-kDa antenna protein and its complex with the photosystem II reaction center core: insights from picosecond fluorescence decay kinetics and resonance Raman spectroscopy.  

PubMed

We report the fluorescence decay kinetics and the vibrational properties of chlorophyll a bound to the 47-kDa antenna protein (CP47) of spinach photosystem II. The chlorophyll fluorescence of CP47 samples decays with four lifetimes (tau = 75.8 ps, 1.05 ns, 3.22 ns, and 5.41 ns). The 75.8-ps and 3.22-ns components are associated with chlorophyll a bound to relatively intact centers, the 1.05-ns component corresponds to chlorophyll bound to centers that are slightly perturbed, and the the 5.41-ns phase probably originates from centers that are severely denatured. The resonance Raman spectrum of CP47 at 441.6 nm (this work) and at 406.7 nm [de Paula, J. C., Ghanotakis, D. F., Bowlby, N. R., Dekker, J. P., Yocum, C. F., & Babcock, G. T. (1990) in Current Research in Photosynthesis (Baltscheffsky, M., Ed.), Vol. I, pp 643-646, Kluwer Academic Publishers, Dordrecht, The Netherlands] shows heterogeneity in the C = O stretching region. This part of the spectrum monitors the environment of the keto group at position 9 of the chlorophyll a molecule. We show that several structurally distinct pools of chlorophyll a are bound to CP47. Four of these may be distinguished by their C9 = O stretching frequencies (nu C = O = 1670, 1688, 1693, and 1701 cm-1). By analyzing the resonance enhancement pattern of these modes, we ascribe the 1693-cm-1 vibration to denatured centers. Of the remaining populations, we propose that the 1670-cm-1 vibration is consistent with a hydrogen bond between the C9 = O group of chlorophyll a and the protein. We elaborate on the role of this chromophore-protein interaction in the mechanism of energy transfer within the 47-kDa antenna protein. PMID:8312265

de Paula, J C; Liefshitz, A; Hinsley, S; Lin, W; Chopra, V; Long, K; Williams, S A; Belts, S; Yocum, C F

1994-02-15

183

Observation of a Narrow Baryon Resonance Decaying to pK{sup 0}{sub S} in Proton-Nucleus Interactions at 70 GeV/c with the SVD-2 Setup  

SciTech Connect

Data from the SVD-2 experiment that were obtained at the IHEP accelerator in 70-GeV/c proton-nucleus interactions are analyzed with the aim of searches for an exotic {theta}{sup +} baryon that decays through the pK{sup 0}{sub S} channel. The reaction pN {yields} pK{sup 0}{sub S} + X characterized by a bounded multiplicity of charged secondaries is used for this analysis. A resonance of mass M = 1526 {+-} 3(stat.) {+-} 3(syst.) MeV/c{sup 2} and width {gamma} < 24 MeV/c{sup 2} is observed in the invariant-mass spectrum of the pK{sup 0}{sub S} system at a statistical significance of 5.6{sigma}. The mass and the width of this resonance correspond to the recently found positive-strangeness {theta}{sup +} baryon, which was predicted to be an exotic baryon consisting of five quarks (pentaquark), uudds-bar. The total cross section for the production of a {theta}{sup +} baryon in pA interactions is estimated at a value within the range 30-120 {mu}b for x{sub F} {>=} 0. An analysis of the A dependence of the cross section for {theta}{sup +}-baryon production does not reveal a significant deviation from the A dependence for inelastic events ({approx}A{sup 0.7})

Aleev, A.N.; Amaglobeli, N.S.; Balandin, V.P.; Boguslavsky, I.V.; Gramenitsky, I.M.; Zhidkov, N.K.; Kokoulina, E.S.; Kosarev, I.G.; Kuzmin, N.A.; Lanshikov, G.I.; Nikitin, V.A.; Oleinik, A.A.; Rufanov, I.A.; Topuria, T.P.; Furmanec, N.F.; Shafranov, M.D.; Yukaev, A.I. [Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 (Russian Federation); Ardashev, E.N.; Vasiliev, M.V.; Vorobiev, A. P. [Institute for High Energy Physics, Protvino, Moscow oblast, 142284 (Russian Federation)] [and others

2005-06-01

184

Dynamically generated hadron resonances  

SciTech Connect

As an example of dynamically generated resonances we mention the interaction of vector mesons with baryons within the local hidden gauge formalism which gives rise to a large amount of such states, many of which can be associated to known resonances, while others represent predictions for new resonances. The width of these states coming from decay into pseudoscalar baryon is also addressed. We also mention recent states coming from {rho}{pi} interaction obtained with Faddeev equations.

Oset, E.; Gonzalez, P. [Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Aptd. 22085, 46071 Valencia (Spain); Ramos, A. Torres [Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona (Spain); Martinez, A. [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan); Garzon, E. J.; Xie, Ju Jun

2011-10-21

185

Observation of a narrow resonance of mass 2.46 GeV/c2 decaying to D*+s?0 and confirmation of the D*sJ(2317) state  

NASA Astrophysics Data System (ADS)

Using 13.5 fb-1 of e+e- annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to Ds*+?0 with a mass near 2.46GeV/c2. The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at 2.32GeV/c2, the DsJ*(2317)+, that decays to Ds+?0. Reconstructing the Ds+?0 and Ds*+?0 final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, ?M(Ds?0)=M(Ds?0)-M(Ds) and ?M(Ds*?0)=M(Ds*?0)-M(Ds*), both of them at values near 350MeV/c2. We interpret these peaks as signatures of two distinct states, the DsJ*(2317)+ plus a new state, designated as the DsJ(2463)+. Because of the similar ?M values, each of these states represents a source of background for the other if photons are lost, ignored or added. A quantitative accounting of these reflections confirms that both states exist. We have measured the mean mass differences =350.0±1.2(stat)±1.0(syst)MeV/c2 for the DsJ*(2317)+ state, and =351.2±1.7(stat)±1.0(syst)MeV/c2 for the new DsJ(2463)+ state. We have also searched, but find no evidence, for decays of the two states via the channels Ds*+?,Ds+?, and Ds+?+?-. The observations of the two states at 2.32 and 2.46GeV/c2, in the Ds+?0 and Ds*+?0 decay channels, respectively, are consistent with their interpretations as cs¯ mesons with an orbital angular momentum L=1 and spin and parity JP=0+ and 1+.

Besson, D.; Anderson, S.; Frolov, V. V.; Gong, D. T.; Kubota, Y.; Li, S. Z.; Poling, R.; Smith, A.; Stepaniak, C. J.; Urheim, J.; Metreveli, Z.; Seth, K. K.; Tomaradze, A.; Zweber, P.; Arms, K.; Eckhart, E.; Gan, K. K.; Gwon, C.; Pedlar, T. K.; von Toerne, E.; Severini, H.; Skubic, P.; Dytman, S. A.; Mueller, J. A.; Nam, S.; Savinov, V.; Hinson, J. W.; Huang, G. S.; Lee, J.; Miller, D. H.; Pavlunin, V.; Sanghi, B.; Shibata, E. I.; Shipsey, I. P. J.; Cronin-Hennessy, D.; Park, C. S.; Park, W.; Thayer, J. B.; Thorndike, E. H.; Coan, T. E.; Gao, Y. S.; Liu, F.; Stroynowski, R.; Artuso, M.; Boulahouache, C.; Blusk, S.; Dambasuren, E.; Dorjkhaidav, O.; Mountain, R.; Muramatsu, H.; Nandakumar, R.; Skwarnicki, T.; Stone, S.; Wang, J. C.; Mahmood, A. H.; Csorna, S. E.; Danko, I.; Bonvicini, G.; Cinabro, D.; Dubrovin, M.; McGee, S.; Bornheim, A.; Lipeles, E.; Pappas, S. P.; Shapiro, A.; Sun, W. M.; Weinstein, A. J.; Briere, R. A.; Chen, G. P.; Ferguson, T.; Tatishvili, G.; Vogel, H.; Watkins, M. E.; Adam, N. E.; Alexander, J. P.; Berkelman, K.; Boisvert, V.; Cassel, D. G.; Duboscq, J. E.; Ecklund, K. M.; Ehrlich, R.; Galik, R. S.; Gibbons, L.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hsu, L.; Jones, C. D.; Kandaswamy, J.; Kreinick, D. L.; Magerkurth, A.; Mahlke-Krüger, H.; Meyer, T. O.; Mistry, N. B.; Patterson, J. R.; Peterson, D.; Pivarski, J.; Richichi, S. J.; Riley, D.; Sadoff, A. J.; Schwarthoff, H.; Shepherd, M. R.; Thayer, J. G.; Urner, D.; Wilksen, T.; Warburton, A.; Weinberger, M.; Athar, S. B.; Avery, P.; Breva-Newell, L.; Potlia, V.; Stoeck, H.; Yelton, J.; Eisenstein, B. I.; Gollin, G. D.; Karliner, I.; Lowrey, N.; Plager, C.; Sedlack, C.; Selen, M.; Thaler, J. J.; Williams, J.; Edwards, K. W.

2003-08-01

186

Suppressed Charmed B Decay  

SciTech Connect

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.

Snoek, Hella Leonie; /Vrije U., Amsterdam

2011-11-28

187

Cyclotron Line and Wind studies of Galactic High Mass X-ray Binaries  

NASA Astrophysics Data System (ADS)

High mass X-ray binaries are rotating neutron stars with very strong magnetic fields that channel accreting matter from their companion star onto the magnetic poles with subsequent collimated X-ray emission. The stars are fed either by a strong stellar wind of the optical companion or by an accretion disk, where material follows the magnetic field lines, emitting X-rays throughout this process either in the accretion column or directly from the neutron star surface. The fast rotation and the narrow collimation of the X-ray emission creates an observed pulsation, forming the concept of a pulsar. Some of the key questions of these thesis are the emission processes above the magnetic pole, including the influence of the magnetic field, the formation of the X-ray beam, and the structure of the stellar wind. An important process is the effect of the teraGauss magnetic field. Cyclotron resonance scattering creates spectral features similar to broad absorption lines (CRSFs or cyclotron lines) that are directly related to the magnetic field. The discovery of cyclotron lines ˜ 35 years ago allows for the only direct method to measure the magnetic field strength in neutron star systems. Variations in the line parameters throughout the pulse phase, and a dependence in the observed luminosity can also aid in the understanding of these processes. In this thesis I present the results of phase averaged and phase resolved analysis of the three high mass X-ray binaries CenX-3, 1A 1118--61, and GX301--2. The data used for this work were obtained with NASA's Rossi X-ray Timing Explorer and the Japanese Suzaku mission. Both satellites are ideal to cover the broad energy band, where CRSFs occur and are necessary for understanding the continuum as a whole. In the process of investigating the 3 sources, I discovered a CRSF at ˜ 55 keV in the transient binary 1A 1118--61, which indicates one of the strongest magnetic fields known in these objects. I used the variations of the CRSF in GX 301--2 throughout its pulse phase to develop a simple dipole model of the relationship between the magnetic moment vector and the spin axis of the neutron star. In Cen X-3 I use a similar model to demonstrate that the magnetic field most likely includes higher orders than just the simple dipole. The use of a wind model in high mass X-ray binaries can give information about the type of accretion, disk or wind, and the structure of the wind by measuring the amount of the material in the line of sight versus orbital phase. In Cen X-3, I used a simple spherical wind model throughout the two binary orbits and found that the observed absorption column densities are not consistent with pure wind accretion, and that either an accretion wake or a disk are needed to be consistent with the data. Similar results were observed in GX 301--2, where the neutron star may have passed through an accretion stream, increasing the observed amount of absorbed material.

Suchy, Slawomir

188

Tooth Decay  

MedlinePLUS

... cavity. Your dentist calls it tooth decay or dental caries. They're all names for a hole ... or abscess. To help prevent cavities Brush your teeth every day with a fluoride toothpaste Clean between ...

189

Tooth Decay  

MedlinePLUS

... forward in dental care, reportedly popularized by returning soldiers from World War II. The NIH completed the ... it was a few generations ago. Millions of American children now have little or no decay, and ...

190

Radioactive Decay  

NSDL National Science Digital Library

With knowledge of Maple, Mathmatica, or MatLab, one should be able to develop a mathematical model for decay of radioactive substances and develop a technique for deciding whether quantitative data fits the model or not.

Smith, David

2001-01-22

191

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

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.

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

192

Energy spread of the unstable state and proton decay observation  

Microsoft Academic Search

Because of the extreme smallness of the energy spread of the unstable state describing the decaying proton, due in its turn to the anomalous smallness of the resonance width lambda expected for proton decay, the application of the Heisenberg time-energy relation predicts the measurement times for proton decay observation to be so long as to forbid a ``continuous'' observation of

Giovanni Salesi

1989-01-01

193

Production of orbitally excited charm mesons in semileptonic B decays  

Microsoft Academic Search

A sample of 3.6 million hadronic Z decays recorded between 1991 and 1995 with the ALEPH detector at LEP is used to investigate semileptonic decays of B mesons into final states involving orbitally excited charm mesons. Topological vertex criteria are used to search for decays involving narrow D$^{**}$ states as well as wide D$^{**}$ resonances and non-resonant D$^{(*)}\\\\pi$ final states.

I De Bonis; D. Decamp; P. Ghez; C. Goy; J P Lees; A. Lucotte; M N Minard; J Y Nief; P Odier; B Pietrzyk; M P Casado; M Chmeissani; J M Crespo; M C Delfino; I Efthymiopoulos; E Fernández; M Fernández-Bosman; L Garrido; A Juste; M Martínez; S Orteu; C Padilla; I C Park; A Pascual; J A Perlas; I Riu; F Sánchez; F Teubert; A Colaleo; D Creanza; M De Palma; G Gelao; M Girone; Giuseppe Iaselli; G Maggi; M Maggi; N Marinelli; S Nuzzo; A Ranieri; G Raso; F Ruggieri; G Selvaggi; L Silvestris; P Tempesta; G Zito; X Huang; J Lin; Q Ouyang; T Wang; Y Xie; R Xu; S Xue; J Zhang; L Zhang; W Zhao; R Alemany; A O Bazarko; G Bonvicini; P G Bright-Thomas; M Cattaneo; P Comas; P Coyle; H Drevermann; Roger W Forty; M Frank; R Hagelberg; J Harvey; P Janot; B Jost; E Kneringer; J Knobloch; Ivan Lehraus; G Lutters; E B Martin; P Mato; Adolf G Minten; R Miquel; L M Mir; L Moneta; T Oest; A Pacheco; J F Pusztaszeri; F Ranjard; P E Rensing; G Rizzo; Luigi Rolandi; W D Schlatter; M Schmelling; M Schmitt; O Schneider; W Tejessy; I R Tomalin; A Venturi; H W Wachsmuth; A Wagner; Ziad J Ajaltouni; A Barrès; C Boyer; A Falvard; P Gay; C Guicheney; P Henrard; J Jousset; B Michel; S Monteil; J C Montret; D Pallin; P Perret; F Podlyski; J Proriol; P Rosnet; J M Rossignol; Tom Fearnley; J B Hansen; J D Hansen; P H Hansen; B S Nilsson; B Rensch; A Wäänänen; A Kyriakis; C Markou; Errietta Simopoulou; I Siotis; Anna Vayaki; K Zachariadou; A Blondel; J C Brient; P Bourdon; A Rougé; M Rumpf; Andrea Valassi; M Verderi; H L Videau; D J Candlin; M I Parsons; E Focardi; G Parrini; M Corden; C H Georgiopoulos; D E Jaffe; A Antonelli; G Bencivenni; G Bologna; F Bossi; P Campana; G Capon; David William Casper; V Chiarella; G Felici; P Laurelli; G Mannocchi; F Murtas; G P Murtas; L Passalacqua; M Pepé-Altarelli; L Curtis; S J Dorris; A W Halley; I G Knowles; J G Lynch; V O'Shea; C Raine; P Reeves; J M Scarr; K Smith; P Teixeira-Dias; A S Thompson; F Thomson; S Thorn; R M Turnbull; U Becker; C Geweniger; G Graefe; P Hanke; G Hansper; V Hepp; E E Kluge; A Putzer; M Schmidt; J Sommer; K Tittel; S Werner; M Wunsch; D Abbaneo; R Beuselinck; David M Binnie; W Cameron; Peter J Dornan; A Moutoussi; J Nash; J K Sedgbeer; A M Stacey; M D Williams; G Dissertori; P Girtler; D Kuhn; G Rudolph; A P Betteridge; C K Bowdery; P Colrain; G Crawford; A J Finch; F Foster; G Hughes; Terence Sloan; M I Williams; A Galla; I Giehl; A M Greene; K Jacobs; K Kleinknecht; G Quast; B Renk; E Rohne; H G Sander; P Van Gemmeren; C Zeitnitz; Jean-Jacques Aubert; A M Bencheikh; C Benchouk; A Bonissent; G Bujosa; D Calvet; J Carr; C A Diaconu; F Etienne; N P Konstantinidis; P Payre; D Rousseau; M Talby; A Sadouki; M Thulasidas; K Trabelsi; M Aleppo; F Ragusa; C Bauer; R Berlich; Walter Blum; V Büscher; H Dietl; Friedrich Dydak; G Ganis; C Gotzhein; H Kroha; G Lütjens; Gerhard Lutz; W Männer; H G Moser; R H Richter; A Rosado-Schlosser; S Schael; Ronald Settles; H C J Seywerd; R Saint-Denis; W Wiedenmann; G Wolf; J Boucrot; O Callot; Y Choi; A Cordier; M Davier; L Duflot; J F Grivaz; P Heusse; A Höcker; A Jacholkowska; M Jacquet; D W Kim; F R Le Diberder; J Lefrançois; A M Lutz; I A Nikolic; H J Park; M H Schune; S Simion; J J Veillet; I Videau; D Zerwas; P Azzurri; G Bagliesi; G Batignani; S Bettarini; C Bozzi; G Calderini; M Carpinelli; M A Ciocci; V Ciulli; R Dell'Orso; R Fantechi; I Ferrante; L Foà; F Forti; A Giassi; M A Giorgi; A Gregorio; F Ligabue; A Lusiani; P S Marrocchesi; A Messineo; Fabrizio Palla; G Sanguinetti; A Sciabà; P Spagnolo; Jack Steinberger; Roberto Tenchini; G Tonelli; C Vannini; P G Verdini; J Walsh; G A Blair; L M Bryant; F Cerutti; J T Chambers; Y Gao; M G Green; T Medcalf; P Perrodo; J A Strong; J H Von Wimmersperg-Töller; David R Botterill; R W Clifft; T R Edgecock; S Haywood; P Maley; P R Norton; J C Thompson; A E Wright; B Bloch-Devaux; P Colas; S Emery; Witold Kozanecki; E Lançon; M C Lemaire; E Locci; B Marx; P Pérez; J Rander; J F Renardy; A Roussarie; J P Schuller; J Schwindling; A Trabelsi; B Vallage; S N Black; J H Dann; R P Johnson; H Y Kim; A M Litke; M A McNeil; G Taylor; C N Booth; R Boswell; C A J Brew; S L Cartwright; F Combley; A Köksal; M H Lehto; W M Newton; J Reeve; L F Thompson; A Böhrer; S Brandt; G D Cowan; Claus Grupen; J A Minguet-Rodríguez; F Rivera; P Saraiva; L Smolik; F Stephan; M Apollonio; L Bosisio; R Della Marina; G Giannini; B Gobbo; G Musolino; J E Rothberg; S R Wasserbaech; S R Armstrong; P Elmer; Z Feng; D P S Ferguson; S González; J Grahl; T C Greening; O J Hayes; H Hu; P A McNamara; J M Nachtman; W Orejudos; Y B Pan; Y Saadi; I J Scott; A M Walsh; Wu Sau Lan; X Wu; J M Yamartino; M Zheng; G Zobernig

1997-01-01

194

Measurement of the Mass and Width and Study of the Spin of the Xi(1690)0 Resonance from Lambdac+ --> Lambda anti-K0 K+ Decay at BaBar  

SciTech Connect

The {Xi}(1690){sup 0} resonance is observed in the {Lambda}{bar K}{sup 0} channel in the decay {Lambda}{sub c}{sup +} {yields} {Lambda}{bar K}{sup 0}K{sup +}, from a data sample corresponding to a total integrated luminosity of {approx} 200 fb{sup -1} recorded by the BABAR detector at the PEP-II asymmetric-energy e+e- collider operating at {approx} 10.58 GeV and {approx} 10.54 GeV center-of-mass energies. A fit to the Dalitz plot intensity distribution corresponding to the coherent superposition of amplitudes describing {Lambda}a{sub 0}(980){sup +} and {Xi}(1690){sup 0} K{sup +} production yields mass and width values of 1684.7 {+-} 1.3(stat.){sub -1.6}{sup +2.2}(syst.) MeV/c{sup 2}, and 8.1{sub -3.5}{sup +3.9}(stat.){sub -0.9}{sup +1.0}(syst.) MeV, respectively, for the {Xi}(1690){sup 0}, while the spin is found to be consistent with value of 1/2 on the basis of studies of the ({Lambda}K{sub S}) angular distribution.

Aubert, B.

2006-09-25

195

Radioactive Decay  

NSDL National Science Digital Library

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

Smith, David; Barker, William

2010-07-05

196

Radioactive Decay  

NSDL National Science Digital Library

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.

Smith, David; Barker, William

2010-06-28

197

B decays  

Microsoft Academic Search

We review the prospects for B decay studies at the LHC. Contributing authors: J. Baines, S.P. Baranov, P. Bartalini, M. Beneke, E. Bouhova, G. Buchalla, I. Caprini, F. Charles, J. Charles, Y. Coadou, P. Colangelo, P. Colrain, J. Damet, F. De Fazio, A. Dighe, H. Dijkstra, P. Eerola, N. Ellis, B. Epp, S. Gadomski, P. Galumian, I. Gavrilenko, S. George,

P Ball; Robert Fleischer; F Tartarelli; P Vikas; G R Wilkinson; J T M Baines; S P Baranov; P Bartalini; Martin Beneke; E Bouhova-Thacker; Gerhard Buchalla; I Caprini; F Charles; J Charles; Y Coadou; P Colangelo; P Colrain; J Damet; F De Fazio; A S Dighe; H Dijkstra; Paule Anna Mari Eerola; Nick Ellis; B Epp; S Gadomski; P I Galumian; I Gavrilenko; S George; V M Ghete; V Gibson; L P Guy; Y Hasegawa; R Iengo; A Jacholkowska; R Jones; A Yu Khodjamirian; E Kneringer; P Koppenburg; H Korsmo; N Labanca; L P Lellouch; M H Lehto; Y Lemoigne; J Libby; J Matias; S Mele; M Misiak; A Nairz; Tatsuya Nakada; A N Nikitenko; N V Nikitin; A Nisati; Fabrizio Palla; E Polycarpo; J Rademacker; F K Rizatdinova; S A Robins; D Rousseau; W Rückstuhl; M A Sanchis; O Schneider; M Shapiro; C H Shepherd-Themistocleous; P Sherwood; L Smirnova; M Smizanska; Andrei Starodumov; N Stepanov; Z Xie; N Yu Zaitsev

2000-01-01

198

CO outflows from high-mass Class 0 protostars in Cygnus-X  

NASA Astrophysics Data System (ADS)

Context. The earliest phases of the formation of high-mass stars are not well known. It is unclear whether high-mass cores in monolithic collapse exist or not, and what the accretion process and origin of the material feeding the precursors of high-mass stars are. As outflows are natural consequences of the accretion process, they represent one of the few (indirect) tracers of accretion. Aims: We aim to search for individual outflows from high-mass cores in Cygnus X and to study the characteristics of the detected ejections. We compare these to what has been found for the low-mass protostars, to understand how ejection and accretion change and behave with final stellar mass. Methods: We used CO (2-1) PdBI observations towards six massive dense clumps, containing a total of 9 high-mass cores. We estimated the bolometric luminosities and masses of the 9 high-mass cores and measured the energetics of outflows. We compared our sample to low-mass objects studied in the literature and developed simple evolutionary models to reproduce the observables. Results: We find that 8 out of 9 high-mass cores are driving clear individual outflows. They are therefore true equivalents of Class 0 protostars in the high-mass regime. The remaining core, CygX-N53 MM2, has only a tentative outflow detection. It could be one of the first examples of a true individual high-mass prestellar core. We also find that the momentum flux of high-mass objects has a linear relation to the reservoir of mass in the envelope, as a scale up of the relations previously found for low-mass protostars. This suggests a fundamental proportionality between accretion rates and envelope masses. The linear dependency implies that the timescale for accretion is similar for high- and low-mass stars. Conclusions: The existence of strong outflows driven by high-mass cores in Cygnus X clearly indicates that high-mass Class 0 protostars exist. The collapsing envelopes of these Class 0 objects have similar sizes and a similar fragmentation scale to the low-mass equivalents, and have enough mass to directly form high-mass stars from a monolithic collapse. If the pre-collapse evolution is quasi-static, the fragmentation scale is expected to limit the size of the initial mass reservoirs for all masses leading to higher densities at birth and therefore shorter free-fall times for higher mass stars. However, we find the collapse timescales to be similar for both low- and high-mass objects. This implies that in a quasi-static view, we would require significant turbulent/magnetic support to slow down the collapse of the more massive envelopes. But with this support still to be discovered, and based on independent indications of large dynamics in pre-collapse gas for high-mass star formation, we propose that such an identical collapse timescale implies that the initial densities, which should set the duration of the collapse, should be similar for all masses. Since the fragmentation scale is identical for all masses, a lower initial density requires that the mass that incorporates massive stars has to have been accreted from larger scales than those of low-mass stars and in a dynamical way. Appendices are available in electronic form at http://www.aanda.org

Duarte-Cabral, A.; Bontemps, S.; Motte, F.; Hennemann, M.; Schneider, N.; André, Ph.

2013-10-01

199

34Cl superallowed ? decay  

NASA Astrophysics Data System (ADS)

The neutron separation energy of 34S and the proton separation energy of 34Cl have been measured accurately via the 33S(n, ?)34S and the 33S(p, ?)34Cl reactions. The measured values imply a Q value of 5492.48+/-0.20 keV for the total decay energy of 34Cl if the calibration is based on the "mass doublet standard" and a Q value of 5492.42+/-0.23 keV if based on the 411.8044+/-0.0011 keV line in 198Au. If the conserved vector current hypothesis is valid and the electromagnetic corrections are made properly, the ft values for superallowed 0+-->0+ ? decays should all be the same. The ft values for the superallowed 34Cl and 14O decays were found to be equal to better than (4+/-16) parts in 104, in agreement with the expectations. NUCLEAR REACTIONS 32S, 33S, 34S(n, ?), E=thermal; measured E?. 33S,34S, 35S deduced neutron separation energy. 33S, 34S(p, ?), E=0.9-1.4 MeV; measured E?. 34Cl, 35Cl deduced resonances, proton separation energy. RADIOACTIVITY 34Cl, 35S, deduced Q. 34Cl, deduced ft.

Raman, S.; Jurney, E. T.; Outlaw, D. A.; Towner, I. S.

1983-03-01

200

Search for New Physics Using High-Mass Tau Pairs from 1.96 TeV pp¯ Collisions  

NASA Astrophysics Data System (ADS)

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 events from standard model background processes and observe 4. We use this result to set limits on the production of heavy scalar and vector particles decaying to tau lepton pairs.

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

2005-09-01

201

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

NASA Astrophysics Data System (ADS)

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.

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

202

Muon decay  

SciTech Connect

Improved searches for rare processes in muon decay have substantially improved existing limits, but no evidence for any non-standard behavior has been found. The result of a recent sensitive search for right-handed currents indicates that the ratio (V + A)-amplitude/(V - A)-amplitude less than or equal to 0.029. This experiment also imposed new limits on non-standard couplings and on the energy scales where lepton substructure and family symmetry breaking effects might manifest themselves.

Steiner, H.

1985-03-01

203

Search for Dilepton Resonances in pp Collisions at {radical}(s)=7 TeV with the ATLAS Detector  

SciTech Connect

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 {radical}(s)=7 TeV at the Large Hadron Collider and correspond to a total integrated luminosity of 1.08 (1.21) fb{sup -1} in the e{sup +}e{sup -} ({mu}{sup +}{mu}{sup -}) 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{sup '} 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{sup '} boson is set. A Randall-Sundrum graviton with coupling k/M{sub Pl}=0.1 is excluded at 95% C.L. for masses below 1.63 TeV.

Aad, G.; Ahles, F.; Beckingham, M.; Bernhard, R.; Bitenc, U.; Bruneliere, R.; Caron, S.; Christov, A.; Consorti, V.; Eckert, S.; Fehling-Kaschek, M.; Flechl, M.; Glatzer, J. [Fakultaet fuer Mathematik und Physik, Albert-Ludwigs-Universitaet, Freiburg i.Br. (Germany); Abbott, B. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma (United States); Abdallah, J.; Bosman, M.; Casado, M. P.; Cavalli-Sforza, M.; Conidi, M. C.; Demirkoz, B. [Institut de Fisica d'Altes Energies and Departament de Fisica de la Universitat Autonoma de Barcelona and ICREA, Barcelona (Spain)

2011-12-30

204

Search for narrow resonances in dilepton mass spectra in pp collisions at s=7TeV  

NASA Astrophysics Data System (ADS)

A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at s=7TeV by the CMS experiment in 2011. The data sample corresponds to an integrated luminosity of approximately 5 fb?1. The event yields observed in the signal regions are consistent with predictions of the standard model backgrounds, and upper limits on the cross section times branching fraction for a resonance decaying to dileptons are extracted from a shape analysis of the dilepton invariant mass distribution. The resulting mass limits at 95% confidence level are 2330 GeV for the Z? in the Sequential Standard Model, 2000 GeV for the superstring-inspired Z?? resonance, 890 (540) GeV for the Stueckelberg extension ZSt? with the mass parameter ?=0.06 (0.04), and 2140 (1810) GeV for Kaluza–Klein gravitons with the coupling parameter k/M of 0.10 (0.05). These limits are the most stringent to date.

CMS Collaboration Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hammer, J.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Liko, D.; Mikulec, I.; Pernicka, M.; Rahbaran, B.; Rohringer, C.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Wagner, P.; Waltenberger, W.; Walzel, G.; Widl, E.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Luyckx, S.; Maes, T.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Staykova, Z.; 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.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Charaf, O.; Clerbaux, B.; De Lentdecker, G.; Dero, V.; Gay, A. P. R.; Hreus, T.; Léonard, A.; Marage, P. E.; 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.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Vanelderen, L.; Verwilligen, P.; Walsh, S.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Bruno, G.; Castello, R.; Caudron, A.; 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.; Perrini, L.; Pin, A.; Piotrzkowski, K.; Schul, N.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Correa Martins Junior, M.; De Jesus Damiao, D.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Aldá Júnior, W. L.; Carvalho, W.; Custódio, A.; Da Costa, E. M.; De Oliveira Martins, C.; Fonseca De Souza, S.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Oguri, V.; Prado Da Silva, W. L.; Santoro, A.; Silva Do Amaral, S. M.; Soares Jorge, L.; Sznajder, A.; 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, S.; Guo, Y.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Teng, H.; Wang, S.; Zhu, B.; Zou, W.; Avila, C.; 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.; Morovic, S.; 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.; Khalil, S.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Müntel, M.; Raidal, M.; Rebane, L.; Tiko, A.; Azzolini, V.; 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.; Banzuzi, K.; Korpela, A.; Tuuva, T.; Besancon, M.; Choudhury, S.; 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.; Shreyber, I.; Titov, M.; Baffioni, S.; Beaudette, F.; Benhabib, L.; Bianchini, L.; Bluj, M.; Broutin, C.; Busson, P.; Charlot, C.; Daci, N.; Dahms, T.; Dobrzynski, L.; Granier de Cassagnac, R.; Haguenauer, M.; Miné, P.; Mironov, C.; 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.; Ferro, C.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Juillot, P.; Karim, M.; Le Bihan, A.-C.; Van Hove, P.; Fassi, F.; Mercier, D.; Beauceron, S.; Beaupere, N.; Bondu, O.; Boudoul, G.; Brun, H.; 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.; Sordini, V.; Tosi, S.; Tschudi, Y.; Verdier, P.; Viret, S.; Tsamalaidze, Z.; Anagnostou, G.; Beranek, S.; Edelhoff, M.; Feld, L.; Heracleous, N.; Hindrichs, O.; Jussen, R.; Klein, K.

2012-08-01

205

GAMMA-RAY VARIABILITY FROM WIND CLUMPING IN HIGH-MASS X-RAY BINARIES WITH JETS  

SciTech Connect

In the subclass of high-mass X-ray binaries known as 'microquasars', relativistic hadrons in the jets launched by the compact object can interact with cold protons from the star's radiatively driven wind, producing pions that then quickly decay into gamma rays. Since the resulting gamma-ray emissivity depends on the target density, the detection of rapid variability in microquasars with Gamma-Ray Large Area Space Telescope and the new generation of Cherenkov imaging arrays could be used to probe the clumped structure of the stellar wind. We show here that the fluctuation in gamma rays can be modeled using a 'porosity length' formalism, usually applied to characterize clumping effects. In particular, for a porosity length defined by h {identical_to} l/f, i.e., as the ratio of the characteristic size l of clumps to their volume filling factor f, we find that the relative fluctuation in gamma-ray emission in a binary with orbital separation a scales as {radical}(h/{pi}a) in the 'thin-jet' limit, and is reduced by a factor 1/{radical}(1 +{phi}a/2l) for a jet with a finite opening angle {phi}. For a thin jet and quite moderate porosity length h {approx} 0.03a, this implies a ca. 10% variation in the gamma-ray emission. Moreover, the illumination of individual large clumps might result in isolated flares, as has been recently observed in some massive gamma-ray binaries.

Owocki, S. P.; Townsend, R. H. D. [Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States); Romero, G. E.; Araudo, A. T. [Inst. Argentino de RadioastronomIa (CCT La Plata, CONICET), C.C.5, 1894 Villa Elisa, Buenos Aires (Argentina)

2009-05-01

206

Chemical Compositions of Massive Clumps in Early Evolutionary Stages of High-Mass Star Formation  

NASA Astrophysics Data System (ADS)

We have conducted systematic surveys of several molecular lines toward massive clumps, which include infrared dark clouds (IRDCs) and high-mass protostellar objects (HMPOs), in order to investigate their evolutionary stages. From these surveys, we have found that most of the massive clumps are chemically more evolved than young low-mass starless cores, and that the shocks due to interaction between outflow and ambient dense gas are more significant in the earlier evolutionary stage of high-mass star formation. Furthermore, we suggest that the initial condition may be different between high- and low-mass star formation.

Sakai, T.; Sakai, N.; Furuya, K.; Aikawa, Y.; Hirota, T.; Yamamoto, S.

2013-10-01

207

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

SciTech Connect

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 the well-known near-side 3 kpc arm. The presence of these masers is significant evidence for high-mass star formation actively occurring in both 3 kpc arms.

Green, J. A.; McClure-Griffiths, N. M.; Caswell, J. L.; Voronkov, M. A. [Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 1710 (Australia); Ellingsen, S. P. [School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001 (Australia); Fuller, G. A.; Quinn, L. [Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester, Manchester, M13 9PL (United Kingdom)

2009-05-10

208

Multi-Resolution Studies of Complex Molecules in High Mass Star Forming Regions  

NASA Astrophysics Data System (ADS)

After our successful molecular studies of the high mass star forming region Orion-KL (Friedel & Widicus Weaver 2012, ApJS, 201, 17; Widicus Weaver & Friedel 2012, ApJS, 201, 16) we have observed three more high mass star forming regions (W3, W75N, and W51). The purpose of these observations is to further constrain the physical conditions under which the different complex organic molecules form and survive. The results of these observations as well as their impact on current molecular formation models will be presented.

Friedel, Douglas N.

2013-06-01

209

Giant Gamow-Teller resonance in neutron-rich nuclei  

SciTech Connect

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.

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

2010-08-15

210

Optical giant resonances in nuclear reactions  

Microsoft Academic Search

Physical reasons for optical giant resonances being a very general ; feature of nuclear reactions are discussed. Optical giant resonances, so ; familiar in the scattering of nucleons on nuclei, were also observed in elastic ; cross sections of composite particles scattered by nuclei and in reaction ; channels of a compound nucleus decay. That this optical giant resonance ;

K. Wildermuth; R. L. Carovillano

1961-01-01

211

Hard X-ray light curves of high-mass X-ray binaries  

Microsoft Academic Search

Using the 9 years of continuous data now available from the Burst and Transient Source Experiment (BATSE) aboard CGRO, we have measured orbital periods and produced folded light curves for eight high-mass X-ray binaries (HMXB). Given the length of the data sets, our determinations are based on many more binary orbits than previous investigations. Thus our source detections have a

S. Laycock; M. J. Coe; C. A. Wilson; B. A. Harmon; M. Finger

2003-01-01

212

The Panchromatic Hubble Andromeda Treasury: A Bayesian Method for Constraining the High Mass Stellar IMF  

NASA Astrophysics Data System (ADS)

The high mass stellar initial mass function (IMF) underpins virtually all of extragalactic astrophysics. However, measurements of the IMF above a few solar masses exhibit significant dispersion, and recent evidence is suggestive of environmentally dependent IMF variations. The Panchromatic Hubble Andromeda Treasury (PHAT)program is a multi-wavelength survey including hundreds of resolved young clusters extending from the near-UV to near-IR, allowing for a systematic study of the high mass stellar IMF for a large set of clusters over a wide range of environments. Here, we present a new Bayesian technique aimed at constraining the properties of the high mass IMF for resolved stars in individual clusters. This method probabilistically considers uncertainties in stellar mass, completeness, and cluster membership, and uses a Markov Chain Monte Carlo (MCMC) to sample the posterior probability distribution. The MCMC analysis allows us to constrain both the slope of the IMF and the upper stellar mass limit for a single cluster, while fully exploring all associated uncertainties and degeneracies. We present simulations that explore the potential biases introduced by the number of observed stars, stellar mass uncertainties, completeness, aging effects and age spread, and binary stars. The application of this technique to the young cluster population in the PHAT survey will result in the one the most comprehensive investigations of the high mass stellar IMF to date. PHAT is supported by HST GO-12055 administered by NASA.

Weisz, Daniel R.; Fouesneau, M.; Hogg, D. W.; Rix, H. W.; Dalcanton, J. J.; Johnson, L. C.; PHAT Collaboration

2012-01-01

213

Sound decay of notes from acoustic guitars  

NASA Astrophysics Data System (ADS)

The acoustic guitar produces tones by transferring energy from the strings, through the bridge to the top plate, back, and air cavity of the guitar. The vibrations are ultimately radiated into the air as sound. The air-cavity and body resonances of the guitar play an important role in both the tone and the sustain (the time it takes notes to decay) produced by the guitar. To study the relationship between resonances of the guitar and the sustain of notes, the resonance frequencies were measured using a mechanical shaker attached to the body of the guitar and laser Doppler vibrometer to measure its vibration. A string was tuned to different frequencies and plucked. The decay of the note was measured with an electromagnetic pickup that measured the vibration of the string, a vibrometer to measure vibration of the top plate, and microphones located inside and outside the guitar. As expected, when the fundamental frequency of the string was near one of the resonances of the guitar, the decay rate was faster (shorter sustain) than when the string was between resonances. The relationship between the decay rates of the different parts of the system will also be discussed.

Galazen, Erika; Nordberg, Joni; Huber, Thomas M.

2005-09-01

214

Challenges in Hyperon Decays.  

National Technical Information Service (NTIS)

We give a personal overview of some of the unsolved problems related to hyperon decays. We cover nonleptonic decays, radiative decays and magnetic moments. Some of the theoretical issues are also touched upon.

D. Chang

2000-01-01

215

A Latin-cross-shaped integrated resonant cantilever with second torsion-mode resonance for ultra-resoluble bio-mass sensing  

Microsoft Academic Search

Second torsion-mode resonance is proposed for microcantilever biosensors for ultra-high mass-weighing sensitivity and resolution. By increasing both the resonant frequency and Q-factor, the higher mode torsional resonance is favorable for improving the mass-sensing performance. For the first time, a Latin-cross-shaped second-mode resonant cantilever is constructed and optimally designed for both signal-readout and resonance-exciting elements. The cantilever sensor is fabricated by

Xiaoyuan Xia; Zhixiang Zhang; Xinxin Li

2008-01-01

216

Resonances and resonance widths  

SciTech Connect

Two-dimensional betatron resonances are much more important than their simple one-dimensional counterparts and exhibit a strong dependence on the betatron phase advance per cell. A practical definition of ''width'' is expanded upon in order to display these relations in tables. A primarily pedagogical introduction is given to explain the tables, and also to encourage a wider capability for deriving resonance behavior and wider use of ''designer'' resonances.

Collins, T.

1986-05-01

217

Semileptonic Decays  

SciTech Connect

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.

Luth, Vera G.; /SLAC

2012-10-02

218

A search for new physics with high mass tau pairs in proton-antiproton collisions at center of mass energy = 1.96 TeV at CDF  

NASA Astrophysics Data System (ADS)

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-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 ? tautau, 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.

Wan, Zongru

219

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

Microsoft Academic Search

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 \\

Donald Francis Smith

2007-01-01

220

Performance of the new high mass resolution time of flight atom probe  

Microsoft Academic Search

Detectability and mass resolution of a newly built high mass resolution time-of-flight atom probe were examined. In order to maximize the detectability, the specimen tip apex, the probe hole, and the entering side of the energy-compensating deflector were aligned by a laser beam. Transmittance of ions through the deflector and mass resolution were optimized varying the combinations of deflector electrode

Osamu Nishikawa; Kazuaki Kurihara; Masahiro Nachi; Morikazu Konishi; Minoru Wada

1981-01-01

221

High mass selectivity for top-down proteomics by application of SWIFT technology  

Microsoft Academic Search

Stored waveform inverse Fourier transform (SWIFT) technology has been implemented on a commercial Fourier transform ICR mass\\u000a spectrometer. Complex ejection\\/isolation waveforms can be generated on an arbitrary waveform generator (AWG) and applied to\\u000a the instrument by use of a high speed analog switch. High mass selectivity and subsequent electron capture dissociation (ECD)\\u000a of the SWIFT isolated ions has been demonstrated

Shenheng Guan; Alma L. Burlingame

2010-01-01

222

Enhanced detection of high-mass proteins by using an active pixel detector.  

PubMed

Flying high: Application of an active pixel detector with high charge sensitivity to a linear time-of-flight mass spectrometer results in enhanced detection of high-mass proteins (such as Immunoglobulin?G; IgG) using a conventional microchannel plate detection system. This technique thus provides a means to extend the mass range of such detectors as well as allowing direct visualization of mass-dependent ion-focusing phenomena. PMID:24039122

Ellis, Shane R; Jungmann, Julia H; Smith, Donald F; Soltwisch, Jens; Heeren, Ron M A

2013-09-03

223

Very compact radio emission from high-mass protostars. II. Dust disks and ionized accretion flows  

Microsoft Academic Search

This paper reports 43 GHz imaging of the high-mass protostars W 33A, AFGL 2591 and NGC 7538 IRS9 at 0.04'' and 0.6'' resolution. In each case, weak ( mJy-level), compact (Ø 100 AU) emission is detected, which has an elongated shape (axis ratio 3). However, for AFGL 2591 and NGC 7538 IRS9, the emission is single-peaked, while for the highest-luminosity

K. M. Menten

2005-01-01

224

Multiple low-turbulence starless cores associated with intermediate- to high-mass star formation  

Microsoft Academic Search

Aims: Characterizing the gas and dust properties prior to and in the neighborhood of active intermediate- to high-mass star formation. Methods: Two Infrared Dark Clouds (IRDCs) - IRDC 19175-4 and IRDC 19175-5 - that are located in the vicinity of the luminous massive star-forming region IRAS 19175+1357, but that remain absorption features up to 70 mum wavelength, were observed with

Henrik Beuther; Thomas Henning

2009-01-01

225

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

SciTech Connect

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.

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

226

Velocity, Density, and Magnetic Field Structure in High-Mass Star Forming Regions  

Microsoft Academic Search

To understand the detailed structure of four representative high-mass star forming regions, we have performed a comparative analysis of magnetic field structure; mass and velocity structure; and local features such as HII regions, outflows, and infrared sources. This work considers areas 5-15arcmin on a side in Orion A (BN\\/KL and Bar regions), NGC 2024, W3 Main, and M17. Primary data

S. J. Kannappan; A. A. Goodman

1995-01-01

227

Critical exponents in metastable decay via quantum activation  

NASA Astrophysics Data System (ADS)

We consider decay of metastable states of forced vibrations of a quantum oscillator close to the bifurcation points where the states disappear. Decay occurs via quantum activation over a quasienergy barrier, a mechanism that differs from both tunneling and thermal activation. The decay probability W scales with the distance ? to the bifurcation point as ?lnW???? . The exponent ? is found for a resonantly driven oscillator and an oscillator modulated at nearly twice its eigenfrequency.

Dykman, M. I.

2007-01-01

228

Critical exponents in metastable decay via quantum activation.  

PubMed

We consider decay of metastable states of forced vibrations of a quantum oscillator close to the bifurcation points where the states disappear. Decay occurs via quantum activation over a quasienergy barrier, a mechanism that differs from both tunneling and thermal activation. The decay probability W scales with the distance eta to the bifurcation point as /ln W/ proportional to eta(xi). The exponent xi is found for a resonantly driven oscillator and an oscillator modulated at nearly twice its eigenfrequency. PMID:17358104

Dykman, M I

2007-01-03

229

Search for the Decay Do + It'e+e- t  

Microsoft Academic Search

A search for the decay of the charmed meson Do t K'e+e- is presented, based on data collected at the $(3770) resonance with the Mark III detector at SPEAR. No evidence for this process is found, resulting in an upper limit on the decay branching ratio of 1.7

J. Adler; J. J. Becker; G. T. Blaylock; T. Bolton; J. C. Brient; J. S. Brown; K. O. Bunnell; M. Burchell; T. H. Burnett; R. E. Cassell; D. Coffman; V. Cook; D. H. Coward; F. DeJongh; D. E. Dorfan; J. Drinkard; G. P. Dubois; G. Eigen; K. F. Einsweiler; B. I. Eisenstein; T. Freese; C. Gatto; G. Gladding; C. Grab; R. P. Hamilton; J. Hauser; C. A. Heusch; D. G. Hitlin; J. M. Izen; P. C. Kim; L. KGpke; A. Li; W. S. Lockman; U. Mallik; C. G. Matthews; A. Mincer; R. Mir; P. M. Mockett; B. Nemati; A. Odian; L. Parrish; R. Partridge; D. Pitman; S. A. Plaetzer; J. D. Richman; H. F. W. Sadrozinski; M. Scarlatella; T. L. Schalk; R. H. Schindler; A. Seiden; C. Simopoulos; A. L. Spadafora; I. E. Stockdale; W. Stockhausen; W. Toki; B. Tripsas; F. Villa; S. Wasserbaech; A. Wattenberg; A. J. Weinstein; S. Weseler; H. J. Willutzki; D. Wisinski; W. J. Wisniewski; R. Xu; Y. Zhu

230

Inclusive ? ? and ?(1520) production in hadronic Z decays  

Microsoft Academic Search

Production of ?? and ?(1520) in hadronic Z decays has been measured using the Delphi detector at Lep. The ?? is directly reconstructed as a charged track in the Delphi microvertex detector and is identified by its ??n? decay leading to a kink between the ?? and ?-track. The reconstruction of the ?(1520) resonance relies strongly on the particle identification

P. Abreu; W. Adam; T. Adye; P. Adzic; I. Ajinenko; Z. Albrecht; T. Alderweireld; G. D. Alekseev; R. Alemany; T. Allmendinger; P. P. Allport; S. Almehed; U. Amaldi; N. Amapane; S. Amato; E. G. Anassontzis; P. Andersson; A. Andreazza; S. Andringa; P. Antilogus; W. D. Apel; Y. Arnoud; B. Åsman; J. E. Augustin; A. Augustinus; P. Baillon; A. Ballestrero; P. Bambade; F. Barao; G. Barbiellini; R. Barbier; D. Y. Bardin; G. Barker; A. Baroncelli; M. Battaglia; M. Baubillier; K. H. Becks; M. Begalli; A. Behrmann; P. Beilliere; Yu. Belokopytov; N. C. Benekos; A. C. Benvenuti; C. Berat; M. Berggren; D. Bertrand; M. Besancon; M. Bigi; M. S. Bilenky; M. A. Bizouard; D. Bloch; H. M. Blom; M. Bonesini; M. Boonekamp; P. S. L. Booth; G. Borisov; C. Bosio; O. Botner; E. Boudinov; B. Bouquet; C. Bourdarios; T. J. V. Bowcock; I. Boyko; I. Bozovic; M. Bozzo; M. Bracko; P. Branchini; R. A. Brenner; P. Bruckman; J. M. Brunet; L. Bugge; T. Buran; B. Buschbeck; P. Buschmann; S. Cabrera; M. Caccia; M. Calvi; T. Camporesi; V. Canale; F. Carena; L. Carroll; C. Caso; M. V. Castillo Gimenez; A. Cattai; F. R. Cavallo; V. Chabaud; Ph. Charpentier; P. Checchia; G. A. Chelkov; R. Chierici; P. Chliapnikov; P. Chochula; V. Chorowicz; J. Chudoba; K. Cieslik; P. Collins; R. Contri; E. Cortina; G. Cosme; F. Cossutti; M. Costa; H. B. Crawley; D. Crennell; S. Crepe; G. Crosetti; J. Cuevas Maestro; S. Czellar; M. Davenport; W. Da Silva; G. Della Ricca; P. Delpierre; N. Demaria; A. De Angelis; W. De Boer; C. De Clercq; B. De Lotto; A. De Min; L. De Paula; H. Dijkstra; L. Di Ciaccio; J. Dolbeau; K. Doroba; M. Dracos; J. Drees; M. Dris; A. Duperrin; J. D. Durand; G. Eigen; T. Ekelof; G. Ekspong; M. Ellert; M. Elsing; J. P. Engel; M. Espirito Santo; G. Fanourakis; D. Fassouliotis; J. Fayot; M. Feindt; A. Ferrer; E. Ferrer-Ribas; F. Ferro; S. Fichet; A. Firestone; U. Flagmeyer; H. Foeth; E. Fokitis; F. Fontanelli; B. Franek; A. G. Frodesen; R. Fruhwirth; F. Fulda-Quenzer; J. Fuster; A. Galloni; D. Gamba; S. Gamblin; M. Gandelman; C. Garcia; C. Gaspar; M. Gaspar; U. Gasparini; Ph. Gavillet; E. N. Gazis; D. Gele; T. Geralis; L. Gerdyukov; N. Ghodbane; I. Gil; F. Glege; R. Gokieli; B. Golob; G. Gomez-Ceballos; P. Goncalves; I. Gonzalez Caballero; G. Gopal; L. Gorn; Yu. Gouz; V. Gracco; J. Grahl; E. Graziani; P. Gris; G. Grosdidier; K. Grzelak; J. Guy; C. Haag; F. Hahn; S. Hahn; S. Haider; A. Hallgren; K. Hamacher; J. Hansen; F. J. Harris; F. Hauler; V. Hedberg; S. Heising; J. J. Hernandez; P. Herquet; H. Herr; T. L. Hessing; J.-M. Heuser; E. Higon; S. O. Holmgren; P. J. Holt; S. Hoorelbeke; M. Houlden; J. Hrubec; M. Huber; K. Huet; G. J. Hughes; K. Hultqvist; J. N. Jackson; R. Jacobsson; P. Jalocha; R. Janik; Ch. Jarlskog; G. Jarlskog; P. Jarry; B. Jean-Marie; D. Jeans; E. K. Johansson; P. Jonsson; C. Joram; P. Juillot; L. Jungermann; F. Kapusta; K. Karafasoulis; S. Katsanevas; E. C. Katsoufis; R. Keranen; B. P. Kersevan; Yu. Khokhlov; B. A. Khomenko; N. N. Khovanski; A. Kiiskinen; B. King; A. Kinvig; N. J. Kjaer; O. Klapp; H. Klein; P. Kluit; P. Kokkinias; V. Kostioukhine; C. Kourkoumelis; O. Kouznetsov; M. Krammer; E. Kriznic; Z. Krumstein; P. Kubinec; J. Kurowska; K. Kurvinen; J. W. Lamsa; J. P. Laugier; R. Lauhakangas; G. Leder; F. Ledroit; V. Lefebure; L. Leinonen; A. Leisos; R. Leitner; G. Lenzen; V. Lepeltier; T. Lesiak; M. Lethuillier; J. Libby; W. Liebig; D. Liko; A. Lipniacka; I. Lippi; B. Loerstad; J. G. Loken; J. H. Lopes; J. M. Lopez; R. Lopez-Fernandez; D. Loukas; P. Lutz; L. Lyons; J. MacNaughton; J. R. Mahon; A. Maio; A. Malek; T. G. M. Malmgren; S. Maltezos; V. Malychev; F. Mandl; J. Marco; R. Marco; B. Marechal; M. Margoni; J. C. Marin; C. Mariotti; A. Markou; C. Martinez-Rivero; S. Marti i Garcia; J. Masik; N. Mastroyiannopoulos; F. Matorras; C. Matteuzzi; G. Matthiae; F. Mazzucato; M. Mazzucato; M. Mc Cubbin; R. Mc Kay; R. Mc Nulty; G. Mc Pherson; C. Meroni; W. T. Meyer; E. Migliore; L. Mirabito; W. A. Mitaroff; U. Mjoernmark; T. Moa; M. Moch; R. Moeller; K. Moenig; M. R. Monge; D. Moraes; X. Moreau; P. Morettini; G. Morton; U. Mueller; K. Muenich; M. Mulders; C. Mulet-Marquis; R. Muresan; W. J. Murray; B. Muryn; G. Myatt; T. Myklebust; F. Naraghi; M. Nassiakou; F. L. Navarria; K. Nawrocki; P. Negri; N. Neufeld; R. Nicolaidou; B. S. Nielsen; P. Niezurawski; M. Nikolenko; V. Nomokonov; A. Nygren; V. Obraztsov; A. G. Olshevski; A. Onofre; R. Orava; G. Orazi; K. Osterberg; A. Ouraou; A. Oyanguren; M. Paganoni; S. Paiano; R. Pain; R. Paiva; J. Palacios; H. Palka; Th. D. Papadopoulou; L. Pape; C. Parkes; F. Parodi; U. Parzefall; A. Passeri; O. Passon; T. Pavel; M. Pegoraro; L. Peralta; M. Pernicka; A. Perrotta; C. Petridou; A. Petrolini; H. T. Phillips; F. Pierre; M. Pimenta; E. Piotto; T. Podobnik; M. E. Pol; G. Polok; P. Poropat; V. Pozdniakov; P. Privitera; N. Pukhaeva; A. Pullia; D. Radojicic

2000-01-01

231

Phenomenological analysis of nonresonant charm meson decays  

SciTech Connect

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}

Bediaga, I.; Goebel, C. [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)

1997-10-01

232

Searches for Leptonic B decays at BABAR  

SciTech Connect

We present the most recent results on the leptonic B decays B->lnu, B->lnugamma, based on the data collected by the BABAR experiment at PEP-II, an asymmetric e{sup +}e{sup -} collider at the center of mass energy of the UPSILON(4S) resonance.

De Nardo, Guglielmo [Physics Department, University of Napoli, Compl. Univ. Monte Sant'Angelo, via Cintia 80126 Napoli (Italy)

2010-02-10

233

Proton decay theory  

Microsoft Academic Search

Topics include minimal SU(5) predictions, gauge boson mediated proton decay, uncertainties in tau\\/sub p\\/, Higgs scalar effects, proton decay via Higgs scalars, supersymmetric SU(5), dimension 5 operators and proton decay, and Higgs scalars and proton decay. (WHK)

Marciano

1983-01-01

234

Decay spectroscopy for nuclear astrophysics: ?- and ?-delayed proton decay  

NASA Astrophysics Data System (ADS)

In several radiative proton capture reactions important in novae and XRBs, the resonant parts play the capital role. We use decay spectroscopy techniques to find these resonances and study their properties. We have developed techniques to measure beta- and beta-delayed proton decay of sd-shell, proton-rich nuclei produced and separated with the MARS recoil spectrometer of Texas A&M University. 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. This allows 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 23Al, 27P, 31Cl, 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 22Na(p,?)23Mg (crucial for the depletion of 22Na in novae), 26mAl(p,?)27Si and 30P(p,?)31S (bottleneck in novae and XRB burning), respectively. Lastly, results with a new detector that allowed us to measure down to about 80 keV proton energy are announced.

Trache, L.; Banu, A.; Hardy, J. C.; Iacob, V. E.; McCleskey, M.; Roeder, B. T.; Simmons, E.; Spiridon, A.; Tribble, R. E.; Saastamoinen, A.; Jokinen, A.; Äysto, J.; Davinson, T.; Lotay, G.; Woods, P. J.; Pollacco, E.

2012-02-01

235

Maximization of the quality factor of an optical resonator  

Microsoft Academic Search

We consider resonance phenomena for the scalar wave equation in an inhomogeneous medium. Resonance is a solution to the wave equation which is spatially localized while its time dependence is harmonic except for decay due to radiation. The decay rate, which is inversely proportional to the qualify factor, depends on the material properties of the medium. In this work, the

Chiu-Yen Kao; Fadil Santosa

2008-01-01

236

AC loss measurement using LC resonance circuit with superconducting coil  

Microsoft Academic Search

The AC loss of multi-filamentary superconducting wire has been measured using a LC resonance circuit composed of a superconducting (SC) coil and a capacitor bank. In the resonance circuit, the oscillation current decays due to the various losses in the circuit. The decay rate depends on the total loss including the loss generated in the specimen inserted inside the SC

Takeshi Ishigohka; Tetsuya Maruhashi; Akira Ninomiya

1994-01-01

237

Inclusive Semileptonic B Decays at BABAR  

SciTech Connect

The authors report updates on two analyses of inclusive semileptonic B decays based on a dataset of 89 million B{bar B} events recorded with the BABAR detector at the {Upsilon}(4S) resonance. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other {bar B} meson. IN the first analysis, the measurement of the first and second moment of the hadronic mass distribution in Cabibbo-favored {bar B} {yields} X{sub c}{ell}{bar {nu}} decays allows for the determination of the nonperturbative parameters {bar {Lambda}} and {lambda}{sub 1} of Heavy Quark Effective Theory (HQET) and |V{sub cb}|. In the second analysis, the hadronic mass distribution is used to measure the inclusive charmless semileptonic branching fraction and to determine |V{sub ub}|.

Langenegger, U

2004-01-27

238

?(1405)-induced nonmesonic decay in kaonic nuclei  

NASA Astrophysics Data System (ADS)

Nonmesonic decay of kaonic nuclei is investigated under a ?(1405) doorway picture in which the Kmacr absorptions in nuclei take place through the ?(1405) resonance. Calculating ?(1405)N?YN transitions with one-meson exchange, we find that the nonmesonic decay ratio ??N/??0N depends strongly on the ratio of the couplings ?(1405)- Kmacr N and ?(1405)-??. Especially, a larger ?(1405)- Kmacr N coupling leads to enhancement of the decay to ?N. Using the chiral unitary approach for description of the Kmacr N amplitudes, we obtain ??N/??0N?1.2 almost independently of the nucleon density and find the total nonmesonic decay width calculated in uniform nuclear matter to be 22 MeV at the normal density.

Sekihara, T.; Jido, D.; Kanada-En'yo, Y.

2009-06-01

239

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

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.

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

240

Measurement of the branching fraction for inclusive semileptonic B meson decays  

Microsoft Academic Search

A largely model-independent measurement of the inclusive electron momentum spectrum and branching fraction for semileptonic decays of B mesons is presented based on data recorded at the Upsilon(4S) resonance with the BABAR detector. Backgrounds from secondary charm decays are separated from prompt B decays using charge and angular correlations between the electron from one B meson and a high momentum

B. Aubert; D. Boutigny; J.-M. Gaillard; A. Hicheur; Y. Karyotakis; J. P. Lees; P. Robbe; V. Tisserand; A. Zghiche; A. Palano; A. Pompili; J. C. Chen; N. D. Qi; G. Rong; P. Wang; Y. S. Zhu; G. Eigen; I. Ofte; B. Stugu; G. S. Abrams; A. W. Borgland; A. B. Breon; D. N. Brown; J. Button-Shafer; R. N. Cahn; E. Charles; M. S. Gill; A. V. Gritsan; Y. Groysman; R. G. Jacobsen; R. W. Kadel; J. Kadyk; L. T. Kerth; Yu. G. Kolomensky; J. F. Kral; C. Leclerc; M. E. Levi; G. Lynch; L. M. Mir; P. J. Oddone; T. J. Orimoto; M. Pripstein; N. A. Roe; A. Romosan; M. T. Ronan; V. G. Shelkov; A. V. Telnov; W. A. Wenzel; T. J. Harrison; C. M. Hawkes; D. J. Knowles; S. W. O'Neale; R. C. Penny; A. T. Watson; N. K. Watson; T. Deppermann; K. Goetzen; H. Koch; B. Lewandowski; K. Peters; H. Schmuecker; M. Steinke; N. R. Barlow; W. Bhimji; J. T. Boyd; N. Chevalier; P. J. Clark; W. N. Cottingham; C. Mackay; F. F. Wilson; K. Abe; C. Hearty; T. S. Mattison; J. A. McKenna; D. Thiessen; S. Jolly; A. K. McKemey; V. E. Blinov; A. D. Bukin; A. R. Buzykaev; V. B. Golubev; V. N. Ivanchenko; A. A. Korol; E. A. Kravchenko; A. P. Onuchin; S. I. Serednyakov; Yu. I. Skovpen; A. N. Yushkov; D. Best; M. Chao; D. Kirkby; A. J. Lankford; M. Mandelkern; S. McMahon; D. P. Stoker; C. Buchanan; S. Chun; H. K. Hadavand; E. J. Hill; D. B. Macfarlane; H. Paar; S. Prell; Sh. Rahatlou; G. Raven; U. Schwanke; V. Sharma; J. W. Berryhill; C. Campagnari; B. Dahmes; P. A. Hart; N. Kuznetsova; S. L. Levy; O. Long; A. Lu; M. A. Mazur; J. D. Richman; W. Verkerke; J. Beringer; A. M. Eisner; M. Grothe; C. A. Heusch; W. S. Lockman; T. Pulliam; T. Schalk; R. E. Schmitz; B. A. Schumm; A. Seiden; M. Turri; W. Walkowiak; D. C. Williams; M. G. Wilson; E. Chen; G. P. Dubois-Felsmann; A. Dvoretskii; D. G. Hitlin; F. C. Porter; A. Ryd; A. Samuel; S. Yang; S. Jayatilleke; G. Mancinelli; B. T. Meadows; M. D. Sokoloff; T. Barillari; P. Bloom; W. T. Ford; U. Nauenberg; A. Olivas; P. Rankin; J. Roy; J. G. Smith; W. C. van Hoek; L. Zhang; J. L. Harton; T. Hu; M. Krishnamurthy; A. Soffer; W. H. Toki; R. J. Wilson; J. Zhang; D. Altenburg; T. Brandt; J. Brose; T. Colberg; M. Dickopp; R. S. Dubitzky; A. Hauke; E. Maly; R. Müller-Pfefferkorn; S. Otto; K. R. Schubert; R. Schwierz; B. Spaan; L. Wilden; D. Bernard; G. R. Bonneaud; F. Brochard; J. Cohen-Tanugi; S. Ferrag; S. T'jampens; Ch. Thiebaux; G. Vasileiadis; M. Verderi; A. Anjomshoaa; R. Bernet; A. Khan; D. Lavin; F. Muheim; S. Playfer; J. E. Swain; J. Tinslay; M. Falbo; C. Borean; C. Bozzi; L. Piemontese; A. Sarti; E. Treadwell; F. Anulli; R. Baldini-Ferroli; A. Calcaterra; R. de Sangro; D. Falciai; G. Finocchiaro; P. Patteri; I. M. Peruzzi; M. Piccolo; A. Zallo; S. Bagnasco; A. Buzzo; R. Contri; G. Crosetti; M. Lo Vetere; M. Macri; M. R. Monge; S. Passaggio; F. C. Pastore; C. Patrignani; E. Robutti; A. Santroni; S. Tosi; S. Bailey; M. Morii; R. Bartoldus; G. J. Grenier; U. Mallik; J. Cochran; H. B. Crawley; J. Lamsa; W. T. Meyer; E. I. Rosenberg; J. Yi; M. Davier; G. Grosdidier; A. Höcker; H. M. Lacker; S. Laplace; F. Le Diberder; V. Lepeltier; A. M. Lutz; T. C. Petersen; S. Plaszczynski; M. H. Schune; L. Tantot; S. Trincaz-Duvoid; G. Wormser; R. M. Bionta; V. Brigljevic; D. J. Lange; K. van Bibber; D. M. Wright; A. J. Bevan; J. R. Fry; E. Gabathuler; R. Gamet; M. George; M. Kay; D. J. Payne; R. J. Sloane; C. Touramanis; M. L. Aspinwall; D. A. Bowerman; P. D. Dauncey; U. Egede; I. Eschrich; G. W. Morton; J. A. Nash; P. Sanders; D. Smith; G. P. Taylor; J. J. Back; G. Bellodi; P. Dixon; P. F. Harrison; R. J. Potter; H. W. Shorthouse; P. Strother; P. B. Vidal; G. Cowan; H. U. Flaecher; S. George; M. G. Green; A. Kurup; C. E. Marker; T. R. McMahon; S. Ricciardi; F. Salvatore; G. Vaitsas; M. A. Winter; D. Brown; C. L. Davis; J. Allison; R. J. Barlow; A. C. Forti; F. Jackson; G. D. Lafferty; A. J. Lyon; N. Savvas; J. H. Weatherall; J. C. Williams; A. Farbin; A. Jawahery; V. Lillard; D. A. Roberts; J. R. Schieck; G. Blaylock; C. Dallapiccola; K. T. Flood; S. S. Hertzbach; R. Kofler; V. B. Koptchev; T. B. Moore; H. Staengle; S. Willocq; B. Brau; R. Cowan; G. Sciolla; F. Taylor; R. K. Yamamoto; M. Milek; P. M. Patel; F. Palombo; J. M. Bauer; L. Cremaldi; V. Eschenburg; R. Kroeger; J. Reidy; D. A. Sanders; D. J. Summers; C. Hast; P. Taras; H. Nicholson; C. Cartaro; N. Cavallo; G. de Nardo; F. Fabozzi; C. Gatto; L. Lista; P. Paolucci; D. Piccolo; C. Sciacca; J. M. Losecco; J. R. Alsmiller; T. A. Gabriel; J. Brau; R. Frey; M. Iwasaki; C. T. Potter; N. B. Sinev; D. Strom; E. Torrence; F. Colecchia; A. Dorigo; F. Galeazzi; M. Margoni; M. Morandin; M. Posocco; M. Rotondo; F. Simonetto; R. Stroili; C. Voci; M. Benayoun; H. Briand; J. Chauveau; P. David; Ch. de La Vaissière; L. del Buono; O. Hamon; Ph. Leruste; J. Ocariz; M. Pivk; L. Roos; J. Stark; P. F. Manfredi; V. Re; V. Speziali; L. Gladney

2003-01-01

241

Search for Ionized Jets toward High-mass Young Stellar Objects  

NASA Astrophysics Data System (ADS)

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 bol > 2 × 104 L ?), 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 × 104 and 1.0 × 105 L ?) 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 ~20 M ? 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 ~4 × 104 yr.

Guzmán, Andrés E.; Garay, Guido; Brooks, Kate J.; Voronkov, Maxim A.

2012-07-01

242

Old Stars in the Massive, Gas-Rich HighMass Galaxies  

NASA Astrophysics Data System (ADS)

We propose to obtain IRAC maps (at 3.6 and 4.5 micron) of a sample of 32 exceptionally gas-rich galaxies extracted from the ALFALFA extragalactic HI survey. These very HIgh HI Mass (HIghMass) galaxies have HI masses > 10^10 Msun and are also very gas-rich for their stellar masses. Are they in an arrested stage of evolution or do their huge HI disks, evident in our HI synthesis maps, result from recent baryon accretion? The current proposal builds on a coordinated multiwavelength program already underway which includes HI synthesis mapping (JVLA, GMRT, WSRT), UV imaging (GALEX), Halpha imaging (KPNO), optical spectroscopy (INT), CO mapping (CARMA), CO line observation (IRAM), and FIR/submm mapping (Herschel). The proposed observations will allow us to probe the underlying older stellar population in the HIghMass galaxies, yielding insight into how many stars were formed at early times and where within their disks that early star formation took place. The additional NIR data will substantially improve the stellar mass estimates relative to our SDSS- only estimates. In combination with the other data, we will determine their star formation histories and disentangle the possible evolutionary scenarios. In particular, the unique combination of sensitivity and angular resolution of Spitzer in this wavelength range is critical to study the substructures of the old stellar population at a resolution that can be easily compared with our UV/optical images and to trace the mass and color profiles into the outer disks of faint surface brightness. The HIghMass galaxies identified by ALFALFA represent the local counterparts of the populations which are likely to dominate future studies of HI at higher redshift with the Square Kilometre Array.

Huang, Shan; Haynes, Martha; Hunt, Leslie; Giovanelli, Riccardo; Adams, Elizabeth; Brinchmann, Jarle; Carpenter, John; Hallenbeck, Gregory; Masters, Karen; Papastergis, Emmanouil; Saintonge, Amelie; Spekkens, Kristine; Stierwalt, Sabrina

2012-12-01

243

Phase resolved O VI variations in the High Mass X-ray Binary SMC X-1/Sk160  

NASA Astrophysics Data System (ADS)

The high-mass eclipsing X-ray binary system SMC X-1/Sk 160 was observed for almost one complete orbit (3.892 days) with the Far Ultraviolet Spectroscopic Explorer (FUSE) on 19-23 July 2003. The X-ray pulsar with a pulse period of P=0.71 sec is eclipsed by the supergiant, a B0 Ib for ˜ 0.6 day. Spectra covering 905-1180 Å with a spectral resolution of ˜ 0.05 Å were obtained for a total of 148 ksec covering orbital phases from 0.20, through conjunction of the pulsar (phase 0.5), ending at phase 0.06, near the end of the X-ray source eclipse. We present an initial analysis of the significant changes in the O VI 1032-1038 absorption formed in the stellar wind of the B0 I primary as a function of orbital phase. The O VI doublet is a coronal line that samples gas near ˜ 3 x 105 K, assuming collisional equilibrium, but is expected to be present under photoionization conditions up to ˜ 106 K, when the X-ray source ionizes the wind around most of the orbit as is the case in SMC X-1. O VI is especially critical since it is the highest ionization stage (O V I.P.=114 eV) of any strong resonance line longward of the Lyman limit, and consequently is the best diagnostic for studying the kinematics of the highly ionized gas in the SMC X-1 system. The O VI variations are compared with those of N V 1238-1242 Å and C IV 1548-1550 Å from archival HST and IUE spectra. R.C. Iping acknoledges support of NASA grant NAG5-11137 to Catholic University of America.

Iping-Petterson, M. A.; Iping, R. C.; Sonneborn, G.; Massa, D.; Schlegel, E. M.; Gruber, D.; Hutchings, J.

2003-12-01

244

High Mass Selectivity for Top-down Proteomics by Application of SWIFT Technology  

PubMed Central

Stored waveform inverse Fourier transform (SWIFT) technology has been implemented on a commercial Fourier transform ICR mass spectrometer. Complex ejection/isolation waveforms can be generated on an arbitrary waveform generator (AWG) and applied to the instrument by use of a high speed analog switch. High mass selectivity and subsequent electron capture dissociation (ECD) of the SWIFT isolated ions has been demonstrated with analysis of intact Bovine histone H4. A mass selectivity about 0,1 m/z unit for isolation of the 18+ charge state ions was achieved. Adaptation of SWIFT on the commercial instrument provides an enhanced capability for characterizing intact proteins by top-down analysis.

Guan, Shenheng; Burlingame, Alma L.

2011-01-01

245

Clumped donor winds in supergiant high-mass X-ray binaries  

NASA Astrophysics Data System (ADS)

To understand the nature of high-mass X-ray binaries it is pivotal to consider the structure of the powerful winds of their donor. Detailed hydrodynamic models of stellar winds predict strong density velocity fluctuations of the accreted flow. These should lead to variability of the X-ray light-curves from HMXBs and should be taken into account in modeling of their X-ray spectra. We will briefly review what is known about the basic properties of hot star winds. The question whether our picture of winds in single stars is compatible with the X-ray observations of HMXBs will be addressed.

Oskinova, Lidia

2012-09-01

246

Very compact radio emission from high-mass protostars. II. Dust disks and ionized accretion flows  

Microsoft Academic Search

This paper reports 43 GHz imaging of the high-mass protostars W33A, AFGL 2591\\u000aand NGC 7538 IRS9 at 0.04'' and 0.6'' resolution. In each case, weak (~mJy),\\u000acompact (~100 AU) emission is detected, which has an elongated shape (axis\\u000aratio ~3). For AFGL 2591 and NGC 7538 IRS9, the emission is single-peaked,\\u000awhile for the highest luminosity source, W33A, a

Floris van der Tak; Karl Menten

2005-01-01

247

DEM L241, a Supernova Remnant Containing a High-mass X-Ray Binary  

NASA Astrophysics Data System (ADS)

A Chandra observation of the Large Magellanic Cloud supernova remnant DEM L241 reveals an interior unresolved source which is probably an accretion-powered binary. The optical counterpart is an O5III(f) star making this a high-mass X-ray binary with an orbital period likely to be of the order of tens of days. Emission from the remnant interior is thermal and spectral information is used to derive density and mass of the hot material. Elongation of the remnant is unusual and possible causes of this are discussed. The precursor star probably had mass >25 M ?

Seward, F. D.; Charles, P. A.; Foster, D. L.; Dickel, J. R.; Romero, P. S.; Edwards, Z. I.; Perry, M.; Williams, R. M.

2012-11-01

248

Monte Carlo Simulator to Study High Mass X-Ray Binary System  

SciTech Connect

We have developed a Monte Carlo simulator for astrophysical objects, which incorporate the transportation of X-ray photons in photoionized plasma. We applied the code to X-ray spectra of high mass X-ray binaries, Vela X-1 and GX 301-2, obtained with Chandra HETGS. By utilizing the simulator, we have successfully reproduced many emission lines observed from Vela X-1. The ionization structure and the matter distribution in the Vela X-1 system are deduced. For GX 301-2, we have derived the physical parameters of material surrounding the neutron star from fully resolved shape of the Compton shoulder in the iron K{alpha} line.

Watanabe, Shin; Nagase, Fumiaki; Takahashi, Tadayuki; /Sagamihara, Inst. Space Astron. Sci.; Sako, Masao; Kahn, Steve M.; /KIPAC, Menlo Park; Ishida, Manabu; Ishisaki, Yoshitaka; /Tokyo Metropolitan U.; Paerels, Frederik; /Columbia U.

2005-07-08

249

Radiative Leptonic B Decays  

SciTech Connect

We present the results of a search for B{sup +} meson decays into {gamma}{ell}{sup +}{nu}{sub {ell}}, where {ell} = e,{mu}. We use a sample of 232 million B{bar B} meson pairs recorded at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II B factory. We measure a partial branching fraction {Delta}{beta} in a restricted region of phase space that reduces the effect of theoretical uncertainties, requiring the lepton energy to be in the range 1.875 and 2.850 GeV, the photon energy to be in the range 0.45 and 2.35 GeV, and the cosine of the angle between the lepton and photon momenta to be less than -0.36, with all quantities computed in the {Upsilon}(4S) center-of-mass frame. We find {Delta}{Beta}(B{sup +} {yields} {gamma}{ell}{sup +}{nu}{sub {ell}}) = (-0.3{sub 1.5}{sup +1.3}(statistical){sub -0.6}{sup +0.6}(systematic) {+-} 0.1(theoretical)) x 10{sup -6}, under the assumption of lepton universality. Interpreted as a 90% confidence-level Bayesian upper limit, the result corresponds to 1.7 x 10{sup -6} for a prior at in amplitude, and 2.3 x 10{sup -6} for a prior at in branching fraction.

Chen, Edward Tann; /Caltech

2008-10-06

250

Study of B Meson Decays with Excited ? and ?' Mesons  

NASA Astrophysics Data System (ADS)

Using 383×106 B Bmacr pairs from the BABAR data sample, we report results for branching fractions of six charged B-meson decay modes, where a charged kaon recoils against a charmless resonance decaying to K Kmacr * or ??? final states with mass in the range (1.2 1.8)GeV/c2. We observe a significant enhancement at the low K Kmacr * invariant mass which is interpreted as B+??(1475)K+, find evidence for the decay B+??(1295)K+, and place upper limits on the decays B+??(1405)K+, B+?f1(1285)K+, B+?f1(1420)K+, and B+??(1680)K+.

Aubert, B.; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prudent, X.; Tisserand, V.; Zghiche, A.; Garra Tico, J.; Grauges, E.; Lopez, L.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Sun, L.; Abrams, G. S.; Battaglia, M.; Brown, D. N.; Button-Shafer, J.; Cahn, R. N.; Groysman, Y.; Jacobsen, R. G.; Kadyk, J. A.; Kerth, L. T.; Kolomensky, Yu. G.; Kukartsev, G.; Lopes Pegna, D.; Lynch, G.; Mir, L. M.; Orimoto, T. J.; Osipenkov, I. L.; Ronan, M. T.; Tackmann, K.; Tanabe, T.; Wenzel, W. A.; Del Amo Sanchez, P.; Hawkes, C. M.; Watson, A. T.; Held, T.; Koch, H.; Pelizaeus, M.; Schroeder, T.; Steinke, M.; Walker, D.; Asgeirsson, D. J.; Cuhadar-Donszelmann, T.; Fulsom, B. G.; Hearty, C.; Mattison, T. S.; McKenna, J. A.; Barrett, M.; Khan, A.; Saleem, M.; Teodorescu, L.; Blinov, V. E.; Bukin, A. D.; Druzhinin, V. P.; Golubev, V. B.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Bondioli, M.; Curry, S.; Eschrich, I.; Kirkby, D.; Lankford, A. J.; Lund, P.; Mandelkern, M.; Martin, E. C.; Stoker, D. P.; Abachi, S.; Buchanan, C.; Foulkes, S. D.; Gary, J. W.; Liu, F.; Long, O.; Shen, B. C.; Zhang, L.; Paar, H. P.; Rahatlou, S.; Sharma, V.; Berryhill, J. W.; Campagnari, C.; Cunha, A.; Dahmes, B.; Hong, T. M.; Kovalskyi, D.; Richman, J. D.; Beck, T. W.; Eisner, A. M.; Flacco, C. J.; Heusch, C. A.; Kroseberg, J.; Lockman, W. S.; Schalk, T.; Schumm, B. A.; Seiden, A.; Wilson, M. G.; Winstrom, L. O.; Chen, E.; Cheng, C. H.; Fang, F.; Hitlin, D. G.; Narsky, I.; Piatenko, T.; Porter, F. C.; Andreassen, R.; Mancinelli, G.; Meadows, B. T.; Mishra, K.; Sokoloff, M. D.; Blanc, F.; Bloom, P. C.; Chen, S.; Ford, W. T.; Hirschauer, J. F.; Kreisel, A.; Nagel, M.; Nauenberg, U.; Olivas, A.; Smith, J. G.; Ulmer, K. A.; Wagner, S. R.; Zhang, J.; Gabareen, A. M.; Soffer, A.; Toki, W. H.; Wilson, R. J.; Winklmeier, F.; Altenburg, D. D.; Feltresi, E.; Hauke, A.; Jasper, H.; Merkel, J.; Petzold, A.; Spaan, B.; Wacker, K.; Klose, V.; Kobel, M. J.; Lacker, H. M.; Mader, W. F.; Nogowski, R.; Schubert, J.; Schubert, K. R.; Schwierz, R.; Sundermann, J. E.; Volk, A.; Bernard, D.; Bonneaud, G. R.; Latour, E.; Lombardo, V.; Thiebaux, Ch.; Verderi, M.; Clark, P. J.; Gradl, W.; Muheim, F.; Playfer, S.; Robertson, A. I.; Watson, J. E.; Xie, Y.; Andreotti, M.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cecchi, A.; Cibinetto, G.; Franchini, P.; Luppi, E.; Negrini, M.; Petrella, A.; Piemontese, L.; Prencipe, E.; Santoro, V.; Anulli, F.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Pacetti, S.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Buzzo, A.; Contri, R.; Lo Vetere, M.; Macri, M. M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Santroni, A.; Tosi, S.; Chaisanguanthum, K. S.; Morii, M.; Wu, J.; Dubitzky, R. S.; Marks, J.; Schenk, S.; Uwer, U.; Bard, D. J.; Dauncey, P. D.; Flack, R. L.; Nash, J. A.; Panduro Vazquez, W.; Tibbetts, M.; Behera, P. K.; Chai, X.; Charles, M. J.; Mallik, U.; Ziegler, V.; Cochran, J.; Crawley, H. B.; Dong, L.; Eyges, V.; Meyer, W. T.; Prell, S.; Rosenberg, E. I.; Rubin, A. E.; Gao, Y. Y.; Gritsan, A. V.; Guo, Z. J.; Lae, C. K.; Denig, A. G.; Fritsch, M.; Schott, G.; Arnaud, N.; Béquilleux, J.; D'Orazio, A.; Davier, M.; Grosdidier, G.; Höcker, A.; Lepeltier, V.; Le Diberder, F.; Lutz, A. M.; Pruvot, S.; Rodier, S.; Roudeau, P.; Schune, M. H.; Serrano, J.; Sordini, V.; Stocchi, A.; Wang, W. F.; Wormser, G.; Lange, D. J.; Wright, D. M.; Bingham, I.; Burke, J. P.; Chavez, C. A.; Forster, I. J.; Fry, J. R.; Gabathuler, E.; Gamet, R.; Hutchcroft, D. E.; Payne, D. J.; Schofield, K. C.; Touramanis, C.; Bevan, A. J.; George, K. A.; di Lodovico, F.; Menges, W.; Sacco, R.; Cowan, G.; Flaecher, H. U.; Hopkins, D. A.; Paramesvaran, S.; Salvatore, F.; Wren, A. C.; Brown, D. N.; Davis, C. L.; Allison, J.; Barlow, N. R.; Barlow, R. J.; Chia, Y. M.; Edgar, C. L.; Lafferty, G. D.; West, T. J.; Yi, J. I.; Anderson, J.; Chen, C.; Jawahery, A.; Roberts, D. A.; Simi, G.; Tuggle, J. M.; Blaylock, G.; Dallapiccola, C.; Hertzbach, S. S.; Li, X.; Moore, T. B.; Salvati, E.; Saremi, S.; Cowan, R.; Dujmic, D.; Fisher, P. H.; Koeneke, K.; Sciolla, G.; Sekula, S. J.; Spitznagel, M.; Taylor, F.; Yamamoto, R. K.; Zhao, M.; Zheng, Y.; McLachlin, S. E.; Patel, P. M.; Robertson, S. H.; Lazzaro, A.; Palombo, F.; Bauer, J. M.; Cremaldi, L.; Eschenburg, V.; Godang, R.; Kroeger, R.; Sanders, D. A.; Summers, D. J.; Zhao, H. W.; Brunet, S.; Côté, D.; Simard, M.; Taras, P.; Viaud, F. B.; Nicholson, H.; de Nardo, G.; Fabozzi, F.; Lista, L.; Monorchio, D.; Sciacca, C.; Baak, M. A.; Raven, G.; Snoek, H. L.; Jessop, C. P.; Knoepfel, K. J.; Losecco, J. M.; Benelli, G.; Corwin, L. A.; Honscheid, K.; Kagan, H.; Kass, R.; Morris, J. P.

2008-08-01

251

?- decay of the neutron-rich isotope 215Pb  

NASA Astrophysics Data System (ADS)

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.

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

252

Study of the ?-?3h-2h+?? decay  

NASA Astrophysics Data System (ADS)

The branching fraction of the ?-?3h-2h+?? decay (h=?,K) is measured with the BABAR detector to be (8.56±0.05±0.42)×10-4, where the first error is statistical and the second systematic. The observed structure of this decay is significantly different from the phase space prediction, with the ? resonance playing a strong role. The decay ?-?f1(1285)?-??, with the f1(1285) meson decaying to four charged pions, is observed and the branching fraction is measured to be (3.9±0.7±0.5)×10-4.

Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Tisserand, V.; Zghiche, A.; Grauges, E.; Palano, A.; Pappagallo, M.; Pompili, A.; Chen, J. C.; Qi, N. D.; Rong, G.; Wang, P.; Zhu, Y. S.; Eigen, G.; Ofte, I.; Stugu, B.; Abrams, G. S.; Battaglia, M.; Borgland, A. W.; Breon, A. B.; Brown, D. N.; Button-Shafer, J.; Cahn, R. N.; Charles, E.; Day, C. T.; Gill, M. S.; Gritsan, A. V.; Groysman, Y.; Jacobsen, R. G.; Kadel, R. W.; Kadyk, J.; Kerth, L. T.; Kolomensky, Yu. G.; Kukartsev, G.; Lynch, G.; Mir, L. M.; Oddone, P. J.; Orimoto, T. J.; Pripstein, M.; Roe, N. A.; Ronan, M. T.; Wenzel, W. A.; Barrett, M.; Ford, K. E.; Harrison, T. J.; Hart, A. J.; Hawkes, C. M.; Morgan, S. E.; Watson, A. T.; Fritsch, M.; Goetzen, K.; Held, T.; Koch, H.; Lewandowski, B.; Pelizaeus, M.; Peters, K.; Schroeder, T.; Steinke, M.; Boyd, J. T.; Burke, J. P.; Chevalier, N.; Cottingham, W. N.; Kelly, M. P.; Cuhadar-Donszelmann, T.; Hearty, C.; Knecht, N. S.; Mattison, T. S.; McKenna, J. A.; Khan, A.; Kyberd, P.; Teodorescu, L.; Blinov, A. E.; Blinov, V. E.; Bukin, A. D.; Druzhinin, V. P.; Golubev, V. B.; Ivanchenko, V. N.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Yushkov, A. N.; Best, D.; Bondioli, M.; Bruinsma, M.; Chao, M.; Eschrich, I.; Kirkby, D.; Lankford, A. J.; Mandelkern, M.; Mommsen, R. K.; Roethel, W.; Stoker, D. P.; Buchanan, C.; Hartfiel, B. L.; Weinstein, A. J. R.; Foulkes, S. D.; Gary, J. W.; Long, O.; Shen, B. C.; Wang, K.; Zhang, L.; Del Re, D.; Hadavand, H. K.; Hill, E. J.; Macfarlane, D. B.; Paar, H. P.; Rahatlou, S.; Sharma, V.; Berryhill, J. W.; Campagnari, C.; Cunha, A.; Dahmes, B.; Hong, T. M.; Lu, A.; Mazur, M. A.; Richman, J. D.; Verkerke, W.; Beck, T. W.; Eisner, A. M.; Flacco, C. J.; Heusch, C. A.; Kroseberg, J.; Lockman, W. S.; Nesom, G.; Schalk, T.; Schumm, B. A.; Seiden, A.; Spradlin, P.; Williams, D. C.; Wilson, M. G.; Albert, J.; Chen, E.; Dubois-Felsmann, G. P.; Dvoretskii, A.; Hitlin, D. G.; Narsky, I.; Piatenko, T.; Porter, F. C.; Ryd, A.; Samuel, A.; Andreassen, R.; Jayatilleke, S.; Mancinelli, G.; Meadows, B. T.; Sokoloff, M. D.; Blanc, F.; Bloom, P.; Chen, S.; Ford, W. T.; Nauenberg, U.; Olivas, A.; Rankin, P.; Ruddick, W. O.; Smith, J. G.; Ulmer, K. A.; Wagner, S. R.; Zhang, J.; Chen, A.; Eckhart, E. A.; Harton, J. L.; Soffer, A.; Toki, W. H.; Wilson, R. J.; Zeng, Q.; Spaan, B.; Altenburg, D.; Brandt, T.; Brose, J.; Dickopp, M.; Feltresi, E.; Hauke, A.; Klose, V.; Lacker, H. M.; Maly, E.; Nogowski, R.; Otto, S.; Petzold, A.; Schott, G.; Schubert, J.; Schubert, K. R.; Schwierz, R.; Sundermann, J. E.; Bernard, D.; Bonneaud, G. R.; Grenier, P.; Schrenk, S.; Thiebaux, Ch.; Vasileiadis, G.; Verderi, M.; Bard, D. J.; Clark, P. J.; Gradl, W.; Muheim, F.; Playfer, S.; Xie, Y.; Andreotti, M.; Azzolini, V.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Luppi, E.; Negrini, M.; Piemontese, L.; Anulli, F.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Zallo, A.; Buzzo, A.; Capra, R.; Contri, R.; Vetere, M. Lo; Macri, M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Santroni, A.; Tosi, S.; Bailey, S.; Brandenburg, G.; Chaisanguanthum, K. S.; Morii, M.; Won, E.; Dubitzky, R. S.; Langenegger, U.; Marks, J.; Schenk, S.; Uwer, U.; Bhimji, W.; Bowerman, D. A.; Dauncey, P. D.; Egede, U.; Flack, R. L.; Gaillard, J. R.; Morton, G. W.; Nash, J. A.; Nikolich, M. B.; Taylor, G. P.; Charles, M. J.; Grenier, G. J.; Mallik, U.; Mohapatra, A. K.; Cochran, J.; Crawley, H. B.; Eyges, V.; Meyer, W. T.; Prell, S.; Rosenberg, E. I.; Rubin, A. E.; Yi, J.; Arnaud, N.; Davier, M.; Giroux, X.; Grosdidier, G.; Höcker, A.; Le Diberder, F.; Lepeltier, V.; Lutz, A. M.; Oyanguren, A.; Petersen, T. C.; Pierini, M.; Plaszczynski, S.; Rodier, S.; Roudeau, P.; Schune, M. H.; Stocchi, A.; Wormser, G.; Cheng, C. H.; Lange, D. J.; Simani, M. C.; Wright, D. M.; Bevan, A. J.; Chavez, C. A.; Coleman, J. P.; Forster, I. J.; Fry, J. R.; Gabathuler, E.; Gamet, R.; George, K. A.; Hutchcroft, D. E.; Parry, R. J.; Payne, D. J.; Touramanis, C.; Cormack, C. M.; di Lodovico, F.; Brown, C. L.; Cowan, G.; Flaecher, H. U.; Green, M. G.; Jackson, P. S.; McMahon, T. R.; Ricciardi, S.; Salvatore, F.; Brown, D.; Davis, C. L.; Allison, J.; Barlow, N. R.; Barlow, R. J.; Hodgkinson, M. C.; Lafferty, G. D.; Naisbit, M. T.; Williams, J. C.; Chen, C.; Farbin, A.; Hulsbergen, W. D.; Jawahery, A.; Kovalskyi, D.; Lae, C. K.; Lillard, V.; Roberts, D. A.; Blaylock, G.; Dallapiccola, C.; Hertzbach, S. S.; Kofler, R.; Koptchev, V. B.; Li, X.; Moore, T. B.; Saremi, S.; Staengle, H.; Willocq, S.; Cowan, R.; Koeneke, K.; Sciolla, G.; Sekula, S. J.; Taylor, F.; Yamamoto, R. K.; Kim, H.

2005-10-01

253

Ringdown spectroscopy of stimulated Raman scattering in a whispering gallery mode resonator.  

PubMed

We report experimental observations of power-dependent, nonexponential decay of light stored in whispering gallery modes caused by stimulated Raman scattering in the resonator host material. Specifically, we show that the instantaneous decay rate of whispering gallery modes of a calcium fluoride resonator increases as the amount of light stored in the resonator decreases. PMID:17392900

Savchenkov, Anatoliy A; Matsko, Andrey B; Mohageg, Makan; Maleki, Lute

2007-03-01

254

Decay Spectroscopy for Nuclear Astrophysics: ?-delayed Proton Decay  

NASA Astrophysics Data System (ADS)

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 23Al, 27P, 31Cl, 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 22Na(p,?)23Mg (crucial for the depletion of 22Na in novae), 26mAl(p,?)27Si and 30P(p,?)31S (bottleneck in novae and XRB burning), respectively. More recently we have radically improved the technique using a gas based detector we call AstroBox.

Trache, L.; Simmons, E.; Spiridon, A.; McCleskey, M.; Roeder, B. T.; Tribble, R. E.; Saastamoinen, A.; Jokinen, A.; Aysto, J.; Davinson, T.; Woods, P. J.; Pollacco, E.; Kebbiri, M.; Pascovici, G.

2011-11-01

255

Decay Spectroscopy for Nuclear Astrophysics: {beta}-delayed Proton Decay  

SciTech Connect

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.

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

256

Observational approach to the chemical evolution of high-mass binaries  

NASA Astrophysics Data System (ADS)

The complexity of composite spectra of close binaries makes the study of the individual stellar spectra extremely difficult. For this reason there exists very little information on the chemical composition of high-mass stars in close binaries, despite its importance for understanding the evolution of massive stars and close binary systems. A way around this problem exists: spectral disentangling allows a time-series of composite spectra to be decomposed into their individual components whilst preserving the total signal-to-noise ratio in the input spectra. Here we present the results of our ongoing project to obtain the atmospheric parameters of high-mass components in binary and multiple systems using spectral disentangling. So far, we have performed detailed abundance studies for 14 stars in eight eclipsing binary systems. Of these, V380 Cyg, V 621 Per and V453 Cyg are the most informative as their primary components are evolved either close to or beyond the TAMS. Contrary to theoretical predictions of rotating single-star evolutionary models, both of these stars show no abundance changes relative to unevolved main sequence stars of the same mass. It is obvious that other effects are important in the chemical evolution of components in binary stars. Analyses are ongoing for further systems, including AH Cep, CW Cep and V478 Cyg.

Pavlovski, K.; Southworth, J.; Tamajo, E.; Kolbas, V.

2011-01-01

257

The Methanol Multibeam Survey: a unique window on high-mass star formation in our Galaxy  

NASA Astrophysics Data System (ADS)

The Methanol Multibeam (MMB) survey has yielded over 1000 masers at the 6668-MHz methanol transition: a near-complete census throughout the Galactic disc, as evident from the discovery statistics, and corroborated by preliminary distance determinations. Each maser pinpoints a massive star in a brief early evolutionary phase. Follow-up comparisons reveal in most cases a matching IR source in the GLIMPSE survey. The methanol masers effectively distinguish the genuine high mass proto-stars from the many thousand IR mimics of similar color. Longer IR wavelength follow-ups by Herschel instruments, and in the radio mm-continuum, will refine the mass-range encompassed by the masers; and, complemented by radio measurements at short cm-wavelengths, will define the evolutionary stage of each site, distinguishing hyper-compact HII regions from an earlier phase. Follow-up studies of key molecular gas tracers, including closely associated masers (other methanol transitions, water and OH), reveal the extent of homogeneity in the population and environments of high mass stars.

Caswell, J. L.

2013-03-01

258

The high-mass disk candidates NGC 7538IRS1 and NGC 7538S  

NASA Astrophysics Data System (ADS)

Context. The nature of embedded accretion disks around forming high-mass stars is one of the missing puzzle pieces for a general understanding of the formation of the most massive and luminous stars. Aims: We want to dissect the small-scale structure of the dust continuum and kinematic gas emission toward two of the most prominent high-mass disk candidates. Methods: Using the Plateau de Bure Interferometer at ~1.36 mm wavelengths in its most extended configuration we probe the dust and gas emission at ~0.3'', corresponding to linear resolution elements of ~800 AU. Results: Even at that high spatial resolution NGC 7538IRS1 remains a single compact and massive gas core with extraordinarily high column densities, corresponding to visual extinctions on the order of 105 mag, and average densities within the central 2000 AU of ~2.1 × 109 cm-3 that have not been measured before. We identify a velocity gradient across in northeast-southwest direction that is consistent with the mid-infrared emission, but we do not find a gradient that corresponds to the proposed CH3OH maser disk. The spectral line data toward NGC 7538IRS1 reveal strong blue- and red-shifted absorption toward the mm continuum peak position. While the blue-shifted absorption is consistent with an outflow along the line of sight, the red-shifted absorption allows us to estimate high infall rates on the order of 10-2 M? yr-1. Although we cannot prove that the gas will be accreted in the end, the data are consistent with ongoing star formation activity in a scaled-up low-mass star formation scenario. Compared to that, NGC 7538S fragments in a hierarchical fashion into several sub-sources. While the kinematics of the main mm peak are dominated by the accompanying jet, we find rotational signatures from a secondary peak. Furthermore, strong spectral line differences exist between the sub-sources which is indicative of different evolutionary stages within the same large-scale gas clump. Conclusions: NGC 7538IRS1 is one of the most extreme high-mass disk candidates known today. The large concentration of mass into a small area combined with the high infall rates are unusual and likely allow continued accretion. While the absorption is interesting for the infall studies, higher-excited lines that do not suffer from the absorption are needed to better study the disk kinematics. In contrast to that, NGC 7538S appears as a more typical high-mass star formation region that fragments into several sources. Many of them will form low- to intermediate-mass stars. The strongest mm continuum peak is likely capable to form a high-mass star, however, likely of lower mass than NGC 7538IRS1. Based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). The data are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/543/A88

Beuther, H.; Linz, H.; Henning, Th.

2012-07-01

259

Colloquium: Spontaneous magnon decays  

NASA Astrophysics Data System (ADS)

A theoretical overview of the phenomenon of spontaneous magnon decays in quantum antiferromagnets is presented. The intrinsic zero-temperature damping of magnons in quantum spin systems is a fascinating many-body effect, which has recently attracted significant attention in view of its possible observation in neutron-scattering experiments. An introduction to the theory of magnon interactions and a discussion of necessary symmetry and kinematic conditions for spontaneous decays are provided. Various parallels with the decays of anharmonic phonons and excitations in superfluid He4 are extensively used. Three principal cases of spontaneous magnon decays are considered: field-induced decays in Heisenberg antiferromagnets, zero-field decays in spiral antiferromagnets, and triplon decays in quantum-disordered magnets. Analytical results are compared with available numerical data and prospective materials for experimental observation of the decay-related effects are briefly discussed.

Zhitomirsky, M. E.; Chernyshev, A. L.

2013-01-01

260

Giant resonances: Progress, new directions, new challenges  

SciTech Connect

A review of some recent developments in the field of giant multipole resonances is presented. Particular emphasis is placed on directions that the authors feel will be followed in this field during the next several years. In particular, the use of high-energy heavy ions to excite the giant resonances is shown to provide exciting new capabilities for giant resonance studies. Among subjects covered are: Coulomb excitation of giant resonances, photon decay of giant resonances, the recent controversy over the identity of the giant monopole resonance, the most recent value for incompressibility of nuclear matter from analysis of giant monopole data, the isospin character of the 63 A/sup /minus/1/3/ GQR, agreement between (e,e/prime/) and (hadron, hadron/prime/) excitation of the giant quadrupole resonance, prospects for multiphonon giant resonance observation, and isolation of the isovector giant quadrupole resonance. 55 refs., 23 figs., 4 tabs.

Bertrand, J.R.; Beene, J.R.

1989-01-01

261

Search for the decay B0-->gammagamma.  

PubMed

We present a limit on the branching fraction for the decay B0-->gammagamma using data collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric energy e+e- collider. Based on the observation of one event in the signal region, out of a sample of 21.3x10(6) e+e--->Upsilon(4S)-->BB decays, we establish an upper limit on the branching fraction of B(B0-->gammagamma)<1.7x10(-6) at the 90% confidence level. This result substantially improves upon existing limits. PMID:11736494

Aubert, B; Boutigny, D; Gaillard, J M; Hicheur, A; Karyotakis, Y; Lees, J P; Robbe, P; Tisserand, V; Palano, A; Chen, G P; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S; Eigen, G; Reinertsen, P L; Stugu, B; Abbott, B; Abrams, G S; Borgland, A W; Breon, A B; Brown, D N; Button-Shafer, J; Cahn, R N; Clark, A R; Gill, M S; Gritsan, A; Groysman, Y; Jacobsen, R G; Kadel, R W; Kadyk, J; Kerth, L T; Kluth, S; Kolomensky, Y G; Kral, J F; LeClerc, C; Levi, M E; Liu, T; Lynch, G; Meyer, A B; Momayezi, M; Oddone, P J; Perazzo, A; Pripstein, M; Roe, N A; Romosan, A; Ronan, M T; Shelkov, V G; Telnov, A V; Wenzel, W A; Bright-Thomas, P G; Harrison, T J; Hawkes, C M; Knowles, D J; O'Neale, S W; Penny, R C; Watson, A T; Watson, N K; Deppermann, T; Goetzen, K; Koch, H; Krug, J; Kunze, M; Lewandowski, B; Peters, K; Schmuecker, H; Steinke, M; Andress, J C; Barlow, N R; Bhimji, W; Chevalier, N; Clark, P J; Cottingham, W N; De Groot, N; Dyce, N; Foster, B; McFall, J D; Wallom, D; Wilson, F F; Abe, K; Hearty, C; Mattison, T S; McKenna, J A; Thiessen, D; Jolly, S; McKemey, A K; Tinslay, J; Blinov, V E; Bukin, A D; Bukin, D A; Buzykaev, A R; Golubev, V B; Ivanchenko, V N; Korol, A A; Kravchenko, E A; Onuchin, A P; Salnikov, A A; Serednyakov, S I; Skovpen, Y I; Telnov, V I; Yushkov, A N; Best, D; Lankford, A J; Mandelkern, M; McMahon, S; Stoker, D P; Ahsan, A; Arisaka, K; Buchanan, C; Chun, S; Branson, J G; MacFarlane, D B; Prell, S; Rahatlou, S; Raven, G; Sharma, V; Campagnari, C; Dahmes, B; Hart, P A; Kuznetsova, N; Levy, S L; Long, O; Lu, A; Richman, J D; Verkerke, W; Witherell, M; Yellin, S; Beringer, J; Dorfan, D E; Eisner, A M; Frey, A; Grillo, A A; Grothe, M; Heusch, C A; Johnson, R P; Kroeger, W; Lockman, W S; Pulliam, T; Sadrozinski, H; Schalk, T; Schmitz, R E; Schumm, B A; Seiden, A; Turri, M; Walkowiak, W; Williams, D C; Wilson, M G; Chen, E; Dubois-Felsmann, G P; Dvoretskii, A; Hitlin, D G; Metzler, S; Oyang, J; Porter, F C; Ryd, A; Samuel, A; Weaver, M; Yang, S; Zhu, R Y; Devmal, S; Geld, T L; Jayatilleke, S; Mancinelli, G; Meadows, B T; Sokoloff, M D; Barillari, T; Bloom, P; Dima, M O; Fahey, S; Ford, W T; Johnson, D R; Nauenberg, U; Olivas, A; Park, H; Rankin, P; Roy, J; Sen, S; Smith, J G; van Hoek, W C; Wagner, D L; Blouw, J; Harton, J L; Krishnamurthy, M; Soffer, A; Toki, W H; Wilson, R J; Zhang, J; Brandt, T; Brose, J; Colberg, T; Dahlinger, G; Dickopp, M; Dubitzky, R S; Maly, E; Müller-Pfefferkorn, R; Otto, S; Schubert, K R; Schwierz, R; Spaan, B; Wilden, L; Behr, L; Bernard, D; Bonneaud, G R; Brochard, F; Cohen-Tanugi, J; Ferrag, S; Roussot, E; T'Jampens, S; Thiebaux, C; Vasileiadis, G; Verderi, M; Anjomshoaa, A; Bernet, R; Khan, A; Muheim, F; Playfer, S; Swain, J E; Falbo, M; Borean, C; Bozzi, C; Dittongo, S; Folegani, M; Piemontese, L; Treadwell, E; Anulli, F; Baldini-Ferroli, R; Calcaterra, A; de Sangro, R; Falciai, D; Finocchiaro, G; Patteri, P; Peruzzi, I M; Piccolo, M; Xie, Y; Zallo, A; Bagnasco, S; Buzzo, A; Contri, R; Crosetti, G; Fabbricatore, P; Farinon, S; Lo Vetere, M; Macri, M; Monge, M R; Musenich, R; Pallavicini, M; Parodi, R; Passaggio, S; Pastore, F C; Patrignani, C; Pia, M G; Priano, C; Robutti, E; Santroni, A; Morii, M; Bartoldus, R; Dignan, T; Hamilton, R; Mallik, U; Cochran, J; Crawley, H B; Fischer, P A; Lamsa, J; Meyer, W T; Rosenberg, E I; Benkebil, M; Grosdidier, G; Hast, C; Höcker, A; Lacker, H M; Laplace, S; Lepeltier, V; Lutz, A M; Plaszczynski, S; Schune, M H; Trincaz-Duvoid, S; Valassi, A; Wormser, G; Bionta, R M; Brigljevi?, V; Lange, D J; Mugge, M; Shi, X; van Bibber, K; Wenaus, T J; Wright, D M; Wuest, C R; Carroll, M; Fry, J R; Gabathuler, E; Gamet, R; George, M; Kay, M; Payne, D J; Sloane, R J; Touramanis, C; Aspinwall, M L; Bowerman, D A; Dauncey, P D; Egede, U; Eschrich, I; Gunawardane, N J; Nash, J A; Sanders, P; Smith, D; Azzopardi, D E; Back, J J; Dixon, P; Harrison, P F; Potter, R J; Shorthouse, H W; Strother, P; Vidal, P B; Williams, M I; Cowan, G; George, S; Green, M G; Kurup, A; Marker, C E; McGrath, P; McMahon, T R; Ricciardi, S; Salvatore, F; Scott, I; Vaitsas, G; Brown, D; Davis, C L; Allison, J; Barlow, R J; Boyd, J T; Forti, A C; Fullwood, J; Jackson, F; Lafferty, G D; Savvas, N; Simopoulos, E T; Weatherall, J H; Farbin, A; Jawahery, A; Lillard, V; Olsen, J; Roberts, D A; Schieck, J R; Blaylock, G; Dallapiccola, C; Flood, K T; Hertzbach, S S; Kofler, R; Moore, T B; Staengle, H; Willocq, S; Brau, B; Cowan, R; Sciolla, G; Taylor, F; Yamamoto, R K; Milek, M; Patel, P M; Trischuk, J; Lanni, F; Palombo, F; Bauer, J M; Booke, M; Cremaldi, L; Eschenburg, V; Kroeger, R; Reidy, J; Sanders, D A; Summers, D J; Martin, J P; Nief, J Y; Seitz, R; Taras, P; Zacek, V; Nicholson, H; Sutton, C S; Cartaro, C; Cavallo, N; De Nardo, G; Fabozzi, F; Gatto, C; Lista, L; Paolucci, P; Piccolo, D; Sciacca, C; LoSecco, J M; Alsmiller, J R; Gabriel, T A

2001-11-27

262

Nuclear axion decay  

Microsoft Academic Search

Nuclear decays are shown to offer a large number of attractive possibilities to search for axions. Some pure isoscalar M1 transitions in light nuclei could have a ratio of axion to gamma decay widths as large as 10-2. RADIOACTIVITY Quantum chromodynamics, axions, nuclear decays.

Augusto Barroso; Nimai C. Mukhopadhyay

1981-01-01

263

Resonantly driven wobbling kinks.  

PubMed

The amplitude of oscillations of the freely wobbling kink in the varphi(4) theory decays due to the emission of second-harmonic radiation. We study the compensation of these radiation losses (as well as additional dissipative losses) by the resonant driving of the kink. We consider both direct and parametric driving at a range of resonance frequencies. In each case, we derive the amplitude equations which describe the evolution of the amplitude of the wobbling and the kink's velocity. These equations predict multistability and hysteretic transitions in the wobbling amplitude for each driving frequency--the conclusion verified by numerical simulations of the full partial differential equation. We show that the strongest parametric resonance occurs when the driving frequency equals the natural wobbling frequency and not double that value. For direct driving, the strongest resonance is at half the natural frequency, but there is also a weaker resonance when the driving frequency equals the natural wobbling frequency itself. We show that this resonance is accompanied by the translational motion of the kink. PMID:19792274

Oxtoby, O F; Barashenkov, I V

2009-08-31

264

Search for lepton flavor violating decays of a heavy neutral particle in p(-)p collisions at sqrt[s]=1.8 TeV.  

PubMed

We report on a search for a high mass, narrow width particle that decays directly to emu, etau, or microtau. 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. PMID:14611332

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; De Pedis, D; 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; Guimaraes da Costa, J; 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; Karagoz Unel, M; 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; Lancaster, M; Lander, R; Lannon, K; 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 J; 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; Paulini, M; Pauly, T; Paus, C; Pellett, D; Penzo, A; Pescara, L; Phillips, T J; Piacentino, G; Piedra, J; Pitts, K T; Pompos, A; Pondrom, L; Pope, G; Pratt, T; Prokoshin, F; Proudfoot, J; Ptohos, F; Pukhov, O; Punzi, G; Rademacker, J; Rakitine, A; Ratnikov, F; Ray, H; Reher, D; Reichold, A; Renton, P; Rescigno, M; Ribon, A; Riegler, W; Rimondi, F; Ristori, L; Riveline, M; Robertson, W J; Rodrigo, T; Rolli, S; Rosenson, L; Roser, R; Rossin, R; Rott, C; Roy, A; Ruiz, A; Ryan, D; Safonov, A; St Denis, R

2003-10-22

265

The Superluminal Source GRS 1915+105: A High Mass X-Ray Binary?  

NASA Astrophysics Data System (ADS)

We obtained K-band (2.0--2.5 mu m) infrared spectra of the visually obscured superluminal source GRS 1915+105 at three different epochs of 1995, at times when it was detected as a hard X-ray source. The three spectra exhibit H I Br gamma (2.167 mu m) and He I (2.058 mu m) emission lines. The spectral morphology, absolute magnitude, and time variability of the infrared counterpart are consistent with the class of high-mass X-ray binaries that contain late Oe and early Be stars as mass donors. In GRS 1915+105 we have not detected the Doppler-shifted emission lines observed in the classic stellar source of relativistic jets, SS 433. We discuss why it may be more difficult in GRS 1915+105 than in SS 433 to detect emission lines from the jets.

Mirabel, I. F.; Bandyopadhyay, R.; Charles, P. A.; Shahbaz, T.; Rodriguez, L. F.

1997-03-01

266

The Superluminal Source GRS 1915+105: A High Mass X-ray Binary?  

NASA Astrophysics Data System (ADS)

We obtained K-band (2.0-2.5 micron) infrared spectra of the visually obscured superluminal source GRS 1915+105 on three different epochs of the year 1995, at times when it was detected as a hard X-ray source. The three spectra exhibit HI Br(gamma) (2.167 micron) and HeI (2.058 micron) emission lines. The spectral morphology, absolute magnitude, and time-variability of the infrared counterpart are consistent with the class of high mass X-ray binaries that contain late Oe and early Be as mass donor stars. In GRS 1915+105 we have not detected Doppler-shifted emission lines, as observed in the classic stellar source of relativistic jets SS 433. We discuss why in GRS 1915+105 it may be more difficult than in SS 433 to detect emission lines from the jets.

Mirabel, I. F.; Bandyopadhyay, P. A.; Charles, P. A.; Shahbaz, T.; Rodriguez, L. F.

1996-01-01

267

Champlane's Search For Quiescent High-mass X-ray Binaries  

NASA Astrophysics Data System (ADS)

The ongoing Chandra Multiwavelength Plane Survey has built a vast database of 15,000 serendipitous Chandra sources in archival ACIS pointings in the Galactic plane. With follow-up deep optical/nIR imaging and spectroscopy, we aim to constrain the Galactic population of low-luminosity (Lx<10^34 erg/s) compact accreting binaries. Here we present the results of a search for candidate high-mass quiescent X-ray binaries (qHMXBs). We have selected O/B counterparts to Chandra sources and examine their measured X-ray spectral hardness, X-ray variability, X-ray-to-optical flux ratio, and inferred distance and X-ray luminosity; in this way we identify 1 promising qHMXB candidate. We compare the properties of the likely isolated O/B stars to those known from earlier shallower (e.g. ROSAT) surveys.

Quinn, Samuel; van den Berg, M.; Hong, J.; Laycock, S.; Grindlay, J.; Zhao, P.

2009-01-01

268

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

NASA Astrophysics Data System (ADS)

High Mass X-ray Binaries (HMXBs) often dominate the high-energy emission from nearby star-forming galaxies. These HMXBs are believed to form in star clusters, but subsequently become displaced from their parent clusters. By comparing observations of HMXBs from Chandra with observations of star clusters from Hubble, we find that approximately one-quarter of the HMXBs in a sample of galaxies still reside within their parent star clusters. We are also using the results of new N-body simulations to show that the vast majority of HMXBs that are found outside of clusters have neutron stars as the compact object. A second intriguing result suggests that up to ages of ~20-30 Myr, most HMXBs within parent clusters have black holes as the compact object.

Rangelov, Blagoy

2012-07-01

269

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

SciTech Connect

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.}

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

270

Near field cosmology with binary, high mass IMF, and hierarchical galaxy formation  

NASA Astrophysics Data System (ADS)

Extremely metal-poor (EMP) stars in the Galactic halo are the remaining survivors of the early generations of stars. Their surface element abundances are signature of the nucleosynthesis in the first and second generation of stars. From comparison between the observationsof EMP stars and calculations of stellar evolution, it is suggested that typical mass of EMP stars are much higher than more metal-rich one and the majority of observed EMP stars are formed in binary systems. I review the effect of binarity and difference of initial mass function on the EMP stars and chemical evolution of galaxy. We calculate chemical enrichment history in the context of hierarchical Galaxy formation with high mass IMF and binary contribution. We compare resultant abundance distributions with observations. Additionally, I discuss the origin of the most metal-deficient stars known to date.

Komiya, Yutaka; Suda, Takuma; Fujimoto, Masayuki Y.

2010-06-01

271

High mass star formation in the Herschel era: highlights of the HOBYS key program  

NASA Astrophysics Data System (ADS)

The formation of massive stars still has many unsolved questions. Here I review some of the many fantastic results that have come about through Herschel observations as part of the Herschel OB Young Stellar Objects Survey (HOBYS). Through this guaranteed time key program, the initial conditions of the high-mass star formation process are studied, providing insight into the earliest stages of how massive stars form and evolve. The specific focus here is on the Rosette Molecular Cloud (RMC) in which the pre- and protostellar objects have been identified and classified. Among the studies presented here are the detection of what may be the identification of massive prestellar cores, a temperature gradient observed across the cloud, and the clump mass function for pre- and protostellar clumps.

Fallscheer, C.

272

High-mass star formation due to cloud-cloud collisions  

SciTech Connect

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. 26 references.

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

1986-11-01

273

An Emission Line Survey for Fields Around High Mass X-Ray Binaries  

NASA Astrophysics Data System (ADS)

To support our current observing program monitoring High Mass X-ray Binary (HMXB) systems for optical variability, we have observed a sample of comparison stars in the fields of several known HMXB systems using calibrated H-alpha and H-beta photometric systems. The observations were secured using the West Mountain 0.9-m telescope. The calibrations were established using multiple spectroscopic observations of H-Beta standards along with cluster stars from the Hyades and Coma clusters obtained with the 1.2-m telescope at the Dominion Astrophysical Observatory. We report the first results for our program to identify and characterize the variable emission observed in the optical counterpart for each HMXB system. We would like to thank the Brigham Young University College of Physical and Mathematical Sciences for continued support of research work at the West Mountain Observatory. Partial support for this project was derived from NSF grant AST #0618209.

Joner, Michael D.; Hintz, E. G.

2012-01-01

274

Potential Optical Counterparts to High Mass X-Ray and ?-Ray Binaries  

NASA Astrophysics Data System (ADS)

We seek to identify optical counterparts to several previously discovered high mass X-ray binaries and ?-ray sources from the Liu et al. and Fermi first year catalogues. Observations were taken with the CTIO 0.9-meter telescope, operated by the SMARTS Consortium. Photometric data were taken in the Strömgren b and y filters, as well as a narrow-band H? filter. We present color-color diagrams of y-H? vs. b-y for each field, and candidates for optical counterparts were selected based on their excesses of H? emission. We also present spectral energy distributions for select candidates. This work is supported by the NSF REU site grant PHY-0849416, NASA DPR No. NNX09AT67G, and Lehigh University. We also thank the SMARTS Consortium, Rachael Roettenbacher, Tina Aragona, and Amber Marsh.

Mitchell, Carl; McSwain, M. V.

2011-01-01

275

High Mass X-ray Binaries In The Mid-infrared  

NASA Astrophysics Data System (ADS)

High mass X-ray binaries (HMXBs) are stellar systems composed of a compact object, either a neutron star or black hole, accreting matter from a massive OB type companion. HMXBs are strong tracers of recent star formation, but the various factors that influence the formation of HMXBs are not well understood. For example, the SMC has a much larger than expected number of HMXBs compared to the Milky Way based on the mass ratio for the two galaxies. We present a comprehensive look at the near to mid-IR emission of these objects utilizing 2MASS, Spitzer, and WISE data. The particular goals of our study are: to establish the mid-IR spectral energy distribution, to search for the signatures of infrared excess and episodes of mass loss, and to study the local environment of these sources.

Wachter, Stefanie

2012-05-01

276

High Precision Iron Isotope Measurements With High Mass Resolution MC-ICPMS  

NASA Astrophysics Data System (ADS)

The interest in Fe isotope compositions in Geo- and Cosmoscience has increased within the last few years, since improved analytical techniques led to the discovery of natural mass dependent isotope fractionation. Relative mass differences of the various Fe isotopes are relatively small, resulting in small isotopic fractionations (typically in the range of a few per mill), requiring precise and reliable methods to detect natural isotope fractionations. The preferred techniques for such measurements are thermal ionization mass spectrometry (TIMS) and multiple collector inductively coupled plasma mass spectrometry (MC-ICPMS). Compared to TIMS, MC-ICPMS has a larger mass bias, about 3% per a.m.u for Fe. However the mass bias is stable, at least for short term measurements, and fast sample/standard switching is possible. Unfortunately, most Fe-isotope peaks suffer from molecular interferences, e.g. 40Ar14N on 54Fe, 40Ar16O on 56Fe, 40Ar16OH on 57Fe, and 40Ar18O on 58Fe, respectively. These interferences can effectively be excluded by high mass resolution. The Thermo Finnigan NEPTUNE is the first commercial high mass resolution MC-ICPMS instrument that can perform high mass resolution measurements with flat top peaks on multiple collectors. The dynamic range of the NEPTUNE's current amplifiers is extended to 50V, improving the precision for large isotopic ratio measurements (e.g. 58Fe/56Fe). Samples were introduced either using a dual glass spray chamber, giving a high signal stability and low memory, or using a CETAC Aridus desolvating nebulizer, that gave a 3-4 fold increase in sensitivity (ca. 10V/ppm on 56Fe in high resolution mode). Only about 500ng of Fe is necessary for a high precision measurement (with internal precision of better than 20ppm 1RSD for 56Fe/54Fe and 57Fe/54Fe). The external precision of the method was tested by measuring several samples with various isotopic compositions. Accuracy was checked by adding variable amounts of an isotopically enriched (in 57Fe) tracer to the standard (IRMM014). All samples were measured using an alternating sample - standard method. In high mass resolution mode blank subtraction has only to be performed if there are large concentration differences between the standard and the sample solutions, since the small blank is mainly iron itself and isotopic variations are rather small. The reproducibility of the delta 56Fe/54Fe and delta 57Fe/54Fe was below 0.1 \\permil (1RSD). The results for the spiked samples agreed within uncertainties with the values calculated from the certified spike values. For external mass bias correction, Ni was added to some sample solutions. For purified samples this correction method did not significantly improve precision and accuracy. However, for matrix-containing samples this technique could be used to some extent to correct for matrix introduced instrumental drift.

Weyer, S.; Johannes, S.; Gerhard, J.

2001-12-01

277

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

NASA Astrophysics Data System (ADS)

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-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.

Sugime, Hisashi; Esconjauregui, Santiago; Yang, Junwei; D'Arsié, Lorenzo; Oliver, Rachel A.; Bhardwaj, Sunil; Cepek, Cinzia; Robertson, John

2013-08-01

278

On the modelling of the excesses of galaxy clusters over high-mass thresholds  

NASA Astrophysics Data System (ADS)

In this work we present for the first time an application of the Pareto approach to the modelling of the excesses of galaxy clusters over high-mass thresholds. The distribution of those excesses can be described by the generalized Pareto distribution (GPD), which is closely related to the generalized extreme value (GEV) distribution. After introducing the formalism, we study the impact of different thresholds and redshift ranges on the distributions, as well as the influence of the survey area on the mean excess above a given mass threshold. We also show that both the GPD and GEV approaches lead to identical results for rare, thus high-mass and high-redshift, clusters. As an example, we apply the Pareto approach to ACT-CL J0102-4915 and SPT-CL J2106-5844 and derive the respective cumulative distribution functions of the exceedance over different mass thresholds. We also study the possibility to use the GPD as a cosmological probe. Since in the maximum likelihood estimation of the distribution parameters all the information from clusters above the mass threshold is used, the GPD might offer an interesting alternative to GEV-based methods that use only the maxima in patches. When comparing the accuracy with which the parameters can be estimated, it turns out that the patch-based modelling of maxima is superior to the Pareto approach. In an ideal case, the GEV approach is capable to estimate the location parameter with a per cent level precision for less than ˜100 patches. This result makes the GEV-based approach potentially also interesting for cluster surveys with a smaller area.

Waizmann, J.-C.; Ettori, S.; Moscardini, L.

2012-06-01

279

First results from VLTI near-infrared interferometry on high-mass young stellar objects  

NASA Astrophysics Data System (ADS)

Due to the recent dramatic technological advances, infrared interferometry can now be applied to new classes of objects, resulting in exciting new science prospects, for instance, in the area of high-mass star formation. Although extensively studied at various wavelengths, the process through which massive stars form is still only poorly understood. For instance, it has been proposed that massive stars might form like low-mass stars by mass accretion through a circumstellar disk/envelope, or otherwise by coalescence in a dense stellar cluster. Therefore, clear observational evidence, such as the detection of disks around high-mass young stellar objects (YSOs), is urgently needed in order to unambiguously identify the formation mode of the most massive stars. After discussing the technological challenges which result from the special properties of these objects, we present first near-infrared interferometric observations, which we obtained on the massive YSO IRAS 13481-6124 using VLTI/AMBER infrared long-baseline interferometry and NTT speckle interferometry. From our extensive data set, we reconstruct a model-independent aperture synthesis image which shows an elongated structure with a size of ~ 13 x 19 AU, consistent with a disk seen under an inclination of - 45°. The measured wavelengthdependent visibilities and closure phases allow us to derive the radial disk temperature gradient and to detect a dust-free region inside of 9.5 AU from the star, revealing qualitative and quantitative similarities with the disks observed in low-mass star formation. In complementary mid-infrared Spitzer and sub-millimeter APEX imaging observations we detect two bow shocks and a molecular outflow, which are oriented perpendicular to the disk plane and indicate the presence of a bipolar outflow emanating from the inner regions of the system.

Kraus, Stefan; Hofmann, Karl-Heinz; Menten, Karl M.; Schertl, Dieter; Weigelt, Gerd; Wyrowski, Friedrich; Meilland, Anthony; Perraut, Karine; Petrov, Romain; Robbe-Dubois, Sylvie; Schilke, Peter; Testi, Leonardo

2010-07-01

280

Chemical Evolution in High-mass Star-forming Regions: Results from the MALT90 Survey  

NASA Astrophysics Data System (ADS)

The chemical changes of high-mass star-forming regions provide a potential method for classifying their evolutionary stages and, ultimately, ages. In this study, we search for correlations between molecular abundances and the evolutionary stages of dense molecular clumps associated with high-mass star formation. We use the molecular line maps from Year 1 of the Millimetre Astronomy Legacy Team 90 GHz (MALT90) Survey. The survey mapped several hundred individual star-forming clumps chosen from the ATLASGAL survey to span the complete range of evolution, from prestellar to protostellar to H II regions. The evolutionary stage of each clump is classified using the Spitzer GLIMPSE/MIPSGAL mid-IR surveys. Where possible, we determine the dust temperatures and H2 column densities for each clump from Herschel/Hi-GAL continuum data. From MALT90 data, we measure the integrated intensities of the N2H+, HCO+, HCN and HNC (1-0) lines, and derive the column densities and abundances of N2H+ and HCO+. The Herschel dust temperatures increase as a function of the IR-based Spitzer evolutionary classification scheme, with the youngest clumps being the coldest, which gives confidence that this classification method provides a reliable way to assign evolutionary stages to clumps. Both N2H+ and HCO+ abundances increase as a function of evolutionary stage, whereas the N2H+ (1-0) to HCO+ (1-0) integrated intensity ratios show no discernable trend. The HCN (1-0) to HNC(1-0) integrated intensity ratios show marginal evidence of an increase as the clumps evolve.

Hoq, Sadia; Jackson, James M.; Foster, Jonathan B.; Sanhueza, Patricio; Guzmán, Andrés; Whitaker, J. Scott; Claysmith, Christopher; Rathborne, Jill M.; Vasyunina, Tatiana; Vasyunin, Anton

2013-11-01

281

Excess Higgs production in neutralino decays  

NASA Astrophysics Data System (ADS)

The ATLAS and CMS experiments have recently claimed discovery of a Higgs boson-like particle at ~5 ? 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 ?? + ?/MET and SUSY multi-lepton/ b searches and a potential discovery in a ?? + 2 b search.

Howe, Kiel; Saraswat, Prashant

2012-10-01

282

Exotic physics: search for new physics leading to high mass tau pairs with ppbar collisions at 1.96 tev using cdf ii  

SciTech Connect

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{bar p} collider. Such anomalous production could arise from various new physics processes. In a data sample corresponding to 195 pb{sup -1} of integrated luminosity we predict 2.8 {+-} 0.5 events from Standard Model background processes and observe 4. We use this result to set limits on the production of heavy scalar and vector particles decaying to tau lepton pairs.

Acosta, D.; The CDF Collaboration

2005-06-14

283

Contribution of High-Mass Black Holes to Mergers of Compact Binaries  

SciTech Connect

We consider the merging of compact binaries consisting of a high-mass black hole and a neutron star. From stellar evolutionary calculations that include mass loss, we estimate that a zero-age main sequence (ZAMS) mass of {approx_gt}80 {ital M}{sub {circle_dot}} is necessary before a high-mass black hole can result from a massive O star progenitor. We first consider how Cyg X-1, with its measured orbital radius of {approximately}17 {ital R}{sub {circle_dot}}, might evolve. Although this radius is substantially less than the initial distance of two O stars, it is still so large that the resulting compact objects will merge only if an eccentricity close to unity results from a high kick velocity of the neutron star in the final supernova explosion. We estimate the probability of the necessary eccentricity to be {approximately}1{percent}; i.e., 99{percent} of the time the explosion of a Cyg X-1{endash}type object will end as a binary of compact stars, which will not merge in Hubble time (unless the orbit is tightened in common envelope evolution, which we discuss later). Although we predict {approximately}7 massive binaries of Cyg X-1 type, we argue that only Cyg X-1 is narrow enough to be observed, and that only Cyg X-1 has an appreciable chance of merging in Hubble time. This gives us a merging rate of {approximately}3{times}10{sup {minus}8} yr{sup {minus}1} in the galaxy, the order of magnitude of the merging rate found by computer-driven population syntheses, if extrapolated to our mass limit of 80 {ital M}{sub {circle_dot}} ZAMS mass for high-mass black hole formation. Furthermore, in both our calculation and in those of population syntheses, almost all of the mergings involve an eccentricity close to unity in the final explosion of the O star. From this first part of our development we obtain only a negligible contribution to our final results for mergers, and it turns out to be irrelevant for our final results. In our main development, instead of relying on observed binaries, we consider the general evolution of binaries of massive stars. The critical stage is when the more massive star A has become a black hole and the less massive star B is a giant reaching out to A. We then have a common envelope, and we expect hypercritical accretion to star A. Star A will accept a small fraction of the mass of the envelope of star B, but it will plunge deep into star B while expelling the envelope of star B. We expect that star B can at least be in the mass range 15{approximately}35 {ital M}{sub {circle_dot}}, while the black hole A has a mass of 10 {ital M}{sub {circle_dot}}. About 20{percent} of the binaries of this type are found to end up in a range of orbital radii favorable for merging; i.e., outside of the relevant Roche lobes, but close enough so that these final binaries of compact objects will merge in Hubble time. The narrow black hole O star orbits do not seem to be found in population syntheses, because in them mergers happen almost completely as a result of kick velocities. In the exception (case H of Portegies Zwart & Yungelson, which includes hypercritical accretion), common envelope evolution is more effective and we are in agreement with their results. We find that the high-mass black hole neutron star systems contribute substantially to the predicted observational frequency of gravitational waves. We discuss how our high-mass black hole formation can be reconciled with the requirements of nucleosynthesis, and we indicate that a bimodal distribution of masses of black holes in single stars can account, at least qualitatively, for the many transient sources that contain high-mass black holes. {copyright} {ital {copyright} 1999.} {ital The American Astronomical Society}

Bethe, H.A. [Floyd R. Newman Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14853 (United States); Brown, G.E. [Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800 (United States)

1999-05-01

284

High-mass accuracy of product ions produced by SORI-CID using a dual electrospray ionization source coupled with FTICR mass spectrometry.  

PubMed

High-mass accuracy is demonstrated using internal calibration for product ions produced by sustained off-resonance irradiation collision-induced dissociation (SORI-CID) of a 15-mer oligonucleotide, 5'-(CTG)5-3'. Internal calibration for this tandem MS experiment was accomplished using a dual electrospray ionization (ESI) source coupled with Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) utilizing hexapole accumulation and gated trapping. The pulse sequence entails injection, trapping, and gas-phase isolation of the precursor ion of interest followed by the SORI-CID of this ion and, subsequently, injection and trapping of the internal mass calibrant (i.e., poly(ethylene glycol) with a 1000 Da average mass). The product ions and the poly(ethylene glycol) ions are then simultaneously excited by a broadband frequency chirp excitation waveform and detected. This technique corrects for space-charge effects on the measurement of an ion's cyclotron frequency experienced when externally calibrated data are used. While external calibration for FTICR-MS can result in mass errors of greater than 100 ppm, this internal standardization method demonstrated significantly more consistent accurate mass measurements with average mass errors ranging from -1.2 to -3.2 ppm for the 15-mer oligonucleotide used in this study. This method requires limited modifications to ESI-FTICR mass spectrometers and is applicable for both positive and negative modes of ionization as well as other sample types (e.g., pharmaceuticals, proteins, etc.). PMID:11305659

Flora, J W; Hannis, J C; Muddiman, D C

2001-03-15

285

Search for B>K*nunu¯ decays  

Microsoft Academic Search

We present a search for the decays B-->K*nunu¯ using 454×106B Bmacr pairs collected at the Upsilon(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We first select an event sample where one B is reconstructed in a semileptonic or hadronic mode with one charmed meson. The remaining particles in the event are then examined to search for a

B. Aubert; M. Bona; Y. Karyotakis; J. P. Lees; V. Poireau; E. Prencipe; X. Prudent; V. Tisserand; J. Garra Tico; E. Grauges; L. Lopez; A. Palano; M. Pappagallo; G. Eigen; B. Stugu; L. Sun; G. S. Abrams; M. Battaglia; D. N. Brown; R. N. Cahn; R. G. Jacobsen; L. T. Kerth; Yu. G. Kolomensky; G. Lynch; I. L. Osipenkov; M. T. Ronan; K. Tackmann; T. Tanabe; C. M. Hawkes; N. Soni; A. T. Watson; H. Koch; T. Schroeder; D. Walker; D. J. Asgeirsson; B. G. Fulsom; C. Hearty; T. S. Mattison; J. A. McKenna; M. Barrett; A. Khan; V. E. Blinov; A. D. Bukin; A. R. Buzykaev; V. P. Druzhinin; V. B. Golubev; A. P. Onuchin; S. I. Serednyakov; Yu. I. Skovpen; E. P. Solodov; K. Yu. Todyshev; M. Bondioli; S. Curry; I. Eschrich; D. Kirkby; A. J. Lankford; P. Lund; M. Mandelkern; E. C. Martin; D. P. Stoker; S. Abachi; C. Buchanan; J. W. Gary; F. Liu; O. Long; B. C. Shen; G. M. Vitug; Z. Yasin; L. Zhang; V. Sharma; C. Campagnari; T. M. Hong; D. Kovalskyi; M. A. Mazur; J. D. Richman; T. W. Beck; A. M. Eisner; C. J. Flacco; C. A. Heusch; J. Kroseberg; W. S. Lockman; A. J. Martinez; T. Schalk; B. A. Schumm; A. Seiden; M. G. Wilson; L. O. Winstrom; C. H. Cheng; D. A. Doll; B. Echenard; F. Fang; D. G. Hitlin; I. Narsky; T. Piatenko; F. C. Porter; R. Andreassen; G. Mancinelli; B. T. Meadows; K. Mishra; M. D. Sokoloff; P. C. Bloom; W. T. Ford; A. Gaz; J. F. Hirschauer; M. Nagel; U. Nauenberg; J. G. Smith; K. A. Ulmer; S. R. Wagner; R. Ayad; A. Soffer; W. H. Toki; R. J. Wilson; D. D. Altenburg; E. Feltresi; A. Hauke; H. Jasper; M. Karbach; J. Merkel; A. Petzold; B. Spaan; K. Wacker; M. J. Kobel; W. F. Mader; R. Nogowski; K. R. Schubert; R. Schwierz; A. Volk; D. Bernard; G. R. Bonneaud; E. Latour; M. Verderi; P. J. Clark; S. Playfer; J. E. Watson; M. Andreotti; D. Bettoni; C. Bozzi; R. Calabrese; A. Cecchi; G. Cibinetto; P. Franchini; E. Luppi; M. Negrini; A. Petrella; L. Piemontese; V. Santoro; R. Baldini-Ferroli; A. Calcaterra; R. de Sangro; G. Finocchiaro; S. Pacetti; P. Patteri; I. M. Peruzzi; M. Piccolo; M. Rama; A. Zallo; A. Buzzo; R. Contri; M. Lo Vetere; M. M. Macri; M. R. Monge; S. Passaggio; C. Patrignani; E. Robutti; A. Santroni; S. Tosi; K. S. Chaisanguanthum; M. Morii; A. Adametz; J. Marks; S. Schenk; U. Uwer; V. Klose; H. M. Lacker; D. J. Bard; P. D. Dauncey; J. A. Nash; M. Tibbetts; P. K. Behera; X. Chai; M. J. Charles; U. Mallik; J. Cochran; H. B. Crawley; L. Dong; W. T. Meyer; S. Prell; E. I. Rosenberg; A. E. Rubin; Y. Y. Gao; A. V. Gritsan; Z. J. Guo; C. K. Lae; N. Arnaud; J. Béquilleux; A. D'Orazio; M. Davier; J. Firmino da Costa; G. Grosdidier; A. Höcker; V. Lepeltier; F. Le Diberder; A. M. Lutz; S. Pruvot; P. Roudeau; M. H. Schune; J. Serrano; V. Sordini; A. Stocchi; G. Wormser; D. J. Lange; D. M. Wright; I. Bingham; J. P. Burke; C. A. Chavez; J. R. Fry; E. Gabathuler; R. Gamet; D. E. Hutchcroft; D. J. Payne; C. Touramanis; A. J. Bevan; C. K. Clarke; K. A. George; F. di Lodovico; R. Sacco; M. Sigamani; G. Cowan; H. U. Flaecher; D. A. Hopkins; S. Paramesvaran; F. Salvatore; A. C. Wren; C. L. Davis; A. G. Denig; M. Fritsch; W. Gradl; G. Schott; K. E. Alwyn; D. Bailey; R. J. Barlow; Y. M. Chia; C. L. Edgar; G. Jackson; G. D. Lafferty; T. J. West; J. I. Yi; J. Anderson; C. Chen; A. Jawahery; D. A. Roberts; G. Simi; J. M. Tuggle; C. Dallapiccola; X. Li; E. Salvati; S. Saremi; R. Cowan; D. Dujmic; P. H. Fisher; G. Sciolla; M. Spitznagel; F. Taylor; R. K. Yamamoto; M. Zhao; P. M. Patel; S. H. Robertson; A. Lazzaro; V. Lombardo; F. Palombo; J. M. Bauer; L. Cremaldi; R. Godang; R. Kroeger; D. A. Sanders; D. J. Summers; H. W. Zhao; M. Simard; P. Taras; F. B. Viaud; H. Nicholson; G. de Nardo; L. Lista; D. Monorchio; G. Onorato; C. Sciacca; G. Raven; H. L. Snoek; C. P. Jessop; K. J. Knoepfel; J. M. Losecco; W. F. Wang; G. Benelli; L. A. Corwin; K. Honscheid; H. Kagan; R. Kass; J. P. Morris; A. M. Rahimi; J. J. Regensburger; S. J. Sekula; Q. K. Wong; N. L. Blount; J. Brau; R. Frey; O. Igonkina; J. A. Kolb; M. Lu; R. Rahmat; N. B. Sinev; D. Strom; J. Strube; E. Torrence; G. Castelli; N. Gagliardi; M. Margoni; M. Morandin; M. Posocco; M. Rotondo; F. Simonetto; R. Stroili; C. Voci; P. Del Amo Sanchez; E. Ben-Haim; H. Briand; G. Calderini; J. Chauveau; P. David; L. Del Buono; O. Hamon; Ph. Leruste; J. Ocariz; A. Perez; J. Prendki; S. Sitt; L. Gladney; M. Biasini; R. Covarelli; E. Manoni; C. Angelini; G. Batignani; S. Bettarini; M. Carpinelli; A. Cervelli; F. Forti; M. A. Giorgi; A. Lusiani; G. Marchiori; M. Morganti; N. Neri; E. Paoloni; G. Rizzo; J. J. Walsh; D. Lopes Pegna; C. Lu; J. Olsen; A. J. S. Smith; A. V. Telnov; F. Anulli; E. Baracchini; G. Cavoto; D. Del Re; E. di Marco; R. Faccini; F. Ferrarotto; F. Ferroni; M. Gaspero; P. D. Jackson; L. Li Gioi; M. A. Mazzoni; S. Morganti; G. Piredda; F. Polci; F. Renga; C. Voena; M. Ebert; T. Hartmann; H. Schröder; R. Waldi; T. Adye; B. Franek

2008-01-01

286

Test of CP invariance in Z?? +? ? ? decay  

Microsoft Academic Search

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.

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

287

Reaction dependence of nuclear decay linewidths  

Microsoft Academic Search

Various light- and heavy-ion reactions, 20 < E < 100 MeV, have been used to study the reaction dependence of alpha-decay widths for 8Be*(2 + , 2.9 MeV) and 16O*(1-, 9.6 MeV). Although slight differences (< 20 %) are found for the observed line shapes (Gamma), the resonance widths inferred (GammaR) are self-consistent and indicate little if any reaction dependence

D. Overway; J. Jänecke; F. D. Becchetti; C. E. Thorn; G. Kekelis

1981-01-01

288

Water deuterium fractionation in the high-mass hot core G34.26+0.15  

NASA Astrophysics Data System (ADS)

Context. Water is an essential molecule in oxygen chemistry and the main constituent of grain icy mantles. The formation of water can be studied through the HDO/H2O ratio. Thanks to the launch of the Herschel satellite and the advance of sensitive submillimeter receivers on ground telescopes, many H2O and HDO transitions can now be observed, enabling more accurate studies of the level of water fractionation. Aims: Using these new technologies, we aim at revisiting the water fractionation studies toward massive star-forming regions. We present here a detailed study toward G34.26+0.15, a massive star-forming region associated with compact HII regions. Methods: We present observations of five HDO lines obtained with the APEX telescope. Two of those transitions are ground-state transitions. Two of the three high-excitation lines were additionally observed at higher angular resolution with the SMA. We analyzed these observations using the 1D radiative transfer code RATRAN and adopting different physical profiles from two different models. Results: Although the inner and outer fractional abundances relative to H2 can be best constrained to be XHDOin(T > 100 K) = (5-7) × 10-8(3?) and XHDOout(T ? 100 K) = (0.3-2) × 10-11(3?), the line profile of the 893 GHz ground transition cannot be well reproduced. This line profile is shown to be very sensitive to the velocity field. To better constrain the velocity field, it is necessary to observe the HDO line at 893 GHz with high angular resolution. The H2O abundance is deduced from one high-excitation and one ground transition {H_218}O line. The D/H ratios of water are 3.0 × 10-4 in the inner region and (1.9-4.9) × 10-4 in the outer region of the core. The HDO fractional abundance in the inner and outer regions are different by more than four orders, which implies that the sublimation is very similar in low- and high-mass protostars. The D/H ratios of water in G34.26 + 0.15 are close to the value obtained for the same source in a previous study, and similar to those in other high-mass sources, but lower than those in low-mass protostars, suggesting the possibility that the dense and cold pre-collapse phase is shorter for high-mass star-forming regions. Based on observations with the APEX telescope and the SMA. APEX is a collaboration between the Max-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory. The Submillimeter Array (SMA) is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics, and is funded by the Smithsonian Institution and the Academia Sinica.Appendix A is available in electronic form at http://www.aanda.org

Liu, F.-C.; Parise, B.; Wyrowski, F.; Zhang, Q.; Güsten, R.

2013-02-01

289

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

NASA Astrophysics Data System (ADS)

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

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

2013-09-01

290

Double beta decay  

SciTech Connect

The subjects of the two-neutrino (2{nu}{beta}{beta}) and neutrinoless double beta (0{nu}{beta}{beta}) decays are introduced. The main theoretical and experimental issues related to the double beta decay are discussed. It is stressed that the study of the 0{nu}{beta}{beta} decay is the most important source of information about the Majorana nature of neutrinos. In addition, the 0{nu}{beta}{beta}-decay half-life can constrain the absolute neutrino mass-scale and the neutrino mass pattern. Morever, the Majorana CP-violating phases, which might be responsible for the matter asymmetry of the Universe, could be deduced from the measured 0{nu}{beta}{beta}-decay rate, once this process will be observed. One can conclude that the double beta decay is an important process for the fields of nuclear physics, particle physics, astrophysics and cosmology.

Stekl, Ivan [Institute of Experimental and Applied Physics, CTU in Prague, Horska 3a, 128 00 Prague 2 (Czech Republic)

2007-11-26

291

Decay of 178Tl  

NASA Astrophysics Data System (ADS)

The isotope 178Tl was produced in a bombardment of 102Pd by 78Kr ions at 340 MeV. Reaction products were separated from the beam by the Berkeley Gas-Filled Separator, and implanted into a silicon strip detector where the subsequent ? decays were measured. Four distinct ? transitions from 178Tl were observed correlated to 6.54 MeV ? decays from the previously known 174Au daughter. In some cases, the 174Au decay was followed by a 5.815-MeV ? decay. This new transition is tentatively assigned to the decay of the 170Ir ground state. The half-life of 178Tl was measured to be 254+11-9 ms. The ? decay branch of 174Au was determined to be 90(6)%.

Rowe, M. W.; Batchelder, J. C.; Ginter, T. N.; Gregorich, K. E.; Guo, F. Q.; Hessberger, F. P.; Ninov, V.; Powell, J.; Toth, K. S.; Xu, X. J.; Cerny, Joseph

2002-05-01

292

Measurement of branching fractions and form factor parameters of B meson going to D meson lepton neutrino and B meson going to D meson resonance lepton neutrino decays at BaBar  

NASA Astrophysics Data System (ADS)

We use a global fit to determine the form factor slopes and branching fractions of the decays B ? D?nu and B ? D*?nu. We reconstruct D? pairs and construct a 3-dimensional distribution binned in lepton momentum, D momentum and cos theta B-D?. These kinematic variables provide good separation between the signal and background. We fit electron and muon samples separately and combine them after calculating systematic uncertainties. The form factor slopes, r2D for B ? D?nu and rho 2 for B ? D*?nu decays, are measured to be r2D = 1.22 +/- 0.04 +/- 0.07 and rho2 = 1.21 +/- 0.02 +/- 0.07, where the errors are statistical and systematic, respectively. Branching fractions are fitted to be B (B+ ? D 0?+nu) = (2.36 +/- 0.03 +/- 0.12)% and B (B+ ? D¯* 0?+nu) = (5.37 +/- 0.02 +/- 0.21)%. We use these results to determine the products, G (1)|Vcb| = (43.8 +/- 0.8 +/- 2.3) x 10-3 and F (1)|Vcb| = (35.7 +/- 0.2 +/- 1.2) x 10-3 of the form factors at zero recoil and the CKM matrix element |Vcb|, from which | Vcb| can be extracted using theoretical input.

Hamano, Kenji

293

The peculiar high-mass X-ray binary 1ES 1210-646  

NASA Astrophysics Data System (ADS)

Using data collected with the BeppoSAX, INTEGRAL and Swift satellites, we report and discuss the results of a study on the X-ray emission properties of the X-ray source 1ES 1210-646, recently classified as a high-mass X-ray binary through optical spectroscopy. This is the first in-depth analysis of the X-ray spectral characteristics of this source. We found that the flux of 1ES 1210-646 varies by a factor of ~3 on a timescale of hundreds of seconds and by a factor of at least 10 among observations acquired over a time span of several months. The X-ray spectrum of 1ES 1210-646 is described using a simple powerlaw shape or, in the case of INTEGRAL data, with a blackbody plus powerlaw model. Spectral variability is found in connection with different flux levels of the source. A strong and transient iron emission line with an energy of ~6.7 keV and an equivalent width of ~1.6 keV is detected when the source is found at an intermediate flux level. The line strength seems to be tied to the orbital motion of the accreting object, as this feature is only apparent at the periastron. Although the X-ray spectral description we find for the 1ES 1210-646 emission is quite atypical for a high-mass X-ray binary, the multiwavelegth information available for this object leads us to confirm this classification. The results presented here allow us instead to definitely rule out the possibility that 1ES 1210-646 is a (magnetic) cataclysmic variable as proposed previously and, in a broader sense, a white dwarf nature for the accretor is disfavoured. X-ray spectroscopic data actually suggest a neutron star with a low magnetic field as the accreting object in this system. Partly based on X-ray observations with INTEGRAL, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA.

Masetti, N.; Landi, R.; Sguera, V.; Capitanio, F.; Bassani, L.; Bazzano, A.; Bird, A. J.; Malizia, A.; Palazzi, E.

2010-02-01

294

Very compact radio emission from high-mass protostars. II. Dust disks and ionized accretion flows  

NASA Astrophysics Data System (ADS)

This paper reports 43 GHz imaging of the high-mass protostars W 33A, AFGL 2591 and NGC 7538 IRS9 at 0.04'' and 0.6'' resolution. In each case, weak ( mJy-level), compact (Ø 100 AU) emission is detected, which has an elongated shape (axis ratio 3). However, for AFGL 2591 and NGC 7538 IRS9, the emission is single-peaked, while for the highest-luminosity source, W 33A, a “mini-cluster” of three sources is detected. The derived sizes, flux densities, and broad-band radio spectra of the sources support recent models where the initial expansion of H ii regions around very young O-type stars is prevented by stellar gravity. In these models, accretion flows onto high-mass stars originate in large-scale molecular envelopes and become ionized close to the star. These models reproduce our observations of ionized gas as well as the structure of the molecular envelopes of these sources on 10^3{-}104 AU scales derived previously from single-dish sub-millimeter continuum and line mapping. For AFGL 2591, the 43 GHz flux density is also consistent with dust emission from a disk recently seen in near-infrared “speckle” images. However, the alignment of the 43 GHz emission with the large-scale molecular outflow argues against an origin in a disk for AFGL 2591 and NGC 7538 IRS9. In contrast, the outflow from W 33A does not appear to be collimated. Together with previously presented case studies of W 3 IRS5 and AFGL 2136, our results indicate that the formation of stars and stellar clusters with luminosities up to 105 L? proceeds through accretion and produces collimated outflows as in the solar-type case, with the “additional feature” that the accretion flow becomes ionized close to the star. Above 105 L?, clusters of H ii regions appear, and outflows are no longer collimated, possibly as the result of mergers of protostars or pre-stellar cores.

van der Tak, F. F. S.; Menten, K. M.

2005-07-01

295

Axions from string decay  

SciTech Connect

We have studied numerically the evolution and decay of axion strings. These global defects decay mainly by axion emission and thus contribute to the cosmological axion energy density. The relative importance of this source relative to misalignment production of axions depends on the spectrum. Radiation spectra for various string loop configurations are presented. They support the contention that the string decay contribution is of the same order of magnitude as the contribution from misalignment.

Hagmann, C., LLNL

1998-07-09

296

Decoherence without classicality in the resonant quantum kicked rotor  

NASA Astrophysics Data System (ADS)

We study the quantum kicked rotor in resonance subjected to a unitary noise defined through Kraus operators. We show that this type of decoherence does not, in general, lead to the classical diffusive behavior. We find exact analytical expressions for the density matrix and the variance in the primary resonances. The variance does not loose its ballistic behavior; however, the coherence decays as a power law. The secondary resonances are treated numerically, obtaining a power-law decay for the variance and an exponential-law decay for the coherence.

Romanelli, A.

2009-08-01

297

Large hadron collider probe of supersymmetric neutrinoless double-beta-decay mechanism.  

PubMed

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

Allanach, B C; Kom, C H; Päs, H

2009-08-25

298

Full-time nonexponential decay in double-barrier quantum structures  

SciTech Connect

We examine an analytical expression for the survival probability for the time evolution of quantum decay to discuss a regime where quantum decay is nonexponential at all times. We find that the interference between the exponential and nonexponential terms of the survival amplitude modifies the usual exponential decay regime in systems where the ratio of the resonance energy to the decay width is less than 0.3. We suggest that such a regime could be observed in semiconductor double-barrier resonant quantum structures with appropriate parameters.

Garcia-Calderon, Gaston [Departamento de Quimica-Fisica, Universidad del Pais Vasco Apartado Postal 644, Bilbao (Spain); Villavicencio, Jorge [Facultad de Ciencias, Universidad Autonoma de Baja California, Apartado Postal 1880, 22800 Ensenada, Baja California (Mexico)

2006-06-15

299

RARE KAON DECAYS.  

SciTech Connect

The past few years have seen an evolution in the study of rare K decays from a concentration on explicitly Standard Model (SM) violating decays such as K{sub L}{sup 0} {r_arrow} {mu}e, to one on SM-allowed but suppressed decays such as K {r_arrow} {pi}{nu}{bar {nu}}, in which short-distance interactions are dominant. There are also a number of recent experimental and theoretical studies of long-distance-dominated decays, but they do not have space to cover these, with the exception of those that are needed in the discussion of the short-distance-dominated processes.

KUDENKO,Y.

1999-06-10

300

On a Glueball in Radiative Decay of phi  

Microsoft Academic Search

Interpreting a narrow resonance with mass 1.44 GeV observed in radiative phi-decay as a pseudoscalar glueball, we analyze the decay process phi-->gamma +glueball from the diagramatic point of view. Our aim is to derive the effective vertex constant for the glueball coupling with two gluons which will occupy an important position in the quantum chromodynamics. The consequence from our analysis

Ei-ichiro Kawai; Yousuke Takeuchi; Kei Senba; Kyousuke Okano

1982-01-01

301

A search for lepton flavour violation in Z0 decays  

Microsoft Academic Search

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

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

302

Internal dynamics of multibarrier systems for pulsed quantum decay  

SciTech Connect

An exact analytical approach is used to explore the dynamics of the decaying probability density and the probability current in multibarrier systems. We show that resonance state interference produces the appearance of breathing or bouncing modes in the dynamical behavior of the probability density along the internal region of the system. This dynamical process involves the reconstruction of the initial state and it is responsible for the pulsed features of the decay recently discussed for the survival probability in these systems.

Garcia-Calderon, Gaston [Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Apartado Postal 20 364, 01000 Mexico, D.F. (Mexico); Romo, Roberto; Villavicencio, Jorge [Facultad de Ciencias, Universidad Autonoma de Baja California, Apartado Postal 1880, 22800 Ensenada, Baja California (Mexico)

2009-05-15

303

Absolute branching fraction measurements of exclusive D0 semileptonic decays.  

PubMed

With the first data sample collected by the CLEO-c detector at the psi(3770) resonance we have studied four exclusive semileptonic decays of the D0 meson. Our results include the first observation and absolute branching fraction measurement for D0 --> p-e+ve and improved measurements of the absolute branching fractions for D0 decays to K-e+ve, pi-e+ve, and K*-e+ve. PMID:16383893

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

2005-10-24

304

The Ionization Toward the High-Mass Star-Forming Region NGC 6334 I  

NASA Astrophysics Data System (ADS)

In this work we present high-resolution spectral line observations carried out with the HIFI (Heterodyne Instrument for the Far Infrared) instrument on board the Herschel Space Observatory (HSO) toward the so-called hot core NGC 6334 I, a region of high-mass star formation. From the Herschel/HIFI observations of the molecular tracers C^{18}O, C^{17}O, HCO^+, H^{13}CO^+, and N_2H^+, we determined the line parameters of each of the rotational transitions, with J_{up}?q5. With these results, and using a non-Local Thermodynamic Equilibrium (LTE) Large Velocity Gradient (LVG) radiative transfer code, we modeled the spectral line emission of the molecular transitions in order to estimate the temperature, H_2 density, source size, and CO, HCO^+ and N_2H^+ column density toward NGC 6334 I. We also derived the H_2 column density as well as the relative abundances between the various molecular species by using the results from the LVG analysis. Finally, by modeling the chemical evolution of the source with a gas-phase reaction network, we obtained an estimate of the cosmic ray ionization rate toward the region. Based on our results, we conclude that there is an expansion of the envelope surrounding the hot core of NGC 6334 I, and the physical and kinematical properties of this expanding envelope are described in our analysis.

Morales, J.; Ceccareli, C.; Olmi, L.; Lis, D.; Plume, R.; Schilke, P.

2013-06-01

305

H-alpha/H-beta and Optical Monitoring of High Mass X-ray Binary Systems  

NASA Astrophysics Data System (ADS)

We have developed a new fully calibrated H-alpha index, defined on both spectroscopic and photometric measurements of bright stars. Using the new H-alpha index, along with the traditional H-beta index, and optical broad band filters, we have monitored a set of High Mass X-ray Binary systems. In a number of cases we have seen significant variation in the H-alpha index, while there is limited variation in H-beta and/or the broad band filters. In one extreme case we see a 0.5 magnitude change in the H-alpha index in only 45 minutes, while H-beta and the optical flux remain constant. We will present results for a number of systems including 4U 2206+54, 1H 1936+541, 1H 2202+501, 4U 1956+35, IGR J00370+6122, RX J0440.9+4421, RX J2030.5+4751, and XTE J0421+560. This work is partially supported by NSF Grant AST-0618209. We also acknowledge use of the facilities of the Dominion Astrophysical Observatory.

Hintz, Eric G.; Joner, M. D.

2012-05-01

306

Optical Observations of the High Mass X-ray Binary 4U 2206+54  

NASA Astrophysics Data System (ADS)

During the summers of 2008 and 2009, we obtained optical observations of the High Mass X-ray Binary (HMXB) 4U 2206+54. Time-series observations were obtained using the 0.4-m David Derrick Telescope at the BYU Orson Pratt Observatory and with the 0.3-m and 0.5-m telescopes of the BYU West Mountain Observatory (WMO). A total of 19 nights were obtained in 2008 and 36 nights in 2009 of time series observations in the V filter. We will also report on additional data obtained around the H-alpha line. Spectral data was obtained with the DAO 1.2-m telescope and photometric data with the new WMO 0.9-m telescope. We will discuss the optical periodicity found in the system and how this might relate to the orbital period. Finally we will report on plans to monitor 4U 2206+54 in the radio wavelengths. Since the delta Scuti variable GSC 03973-01698 is contained in all our CCD frames we will include a short analysis of this target as well.

Bugno, Jessica; Hintz, E. G.; Joner, M. D.; Laney, C. D.; Migenes, V.

2010-01-01

307

Spectral Energy Distributions of High-Mass Protostellar Objects: Evidence of High Accretion Rates  

NASA Astrophysics Data System (ADS)

The spectral energy distributions (SEDs), spanning the mid-infrared to millimeter wavelengths, of a sample of 13 high-mass protostellar objects (HMPOs) were studied using a large archive of 2D axisymmetric radiative transfer models. Measurements from the Spitzer GLIMPSE and MIPSGAL surveys and the MSX survey were used in addition to our own surveys at millimeter and submillimeter wavelengths to construct the SEDs, which were then fit to the archive of models. These models assumed that stars of all masses form via accretion and allowed us to make estimates for the masses, luminosities, and envelope accretion rates for the HMPOs. The models fit the observed SEDs well. The implied envelope accretion rates are high, ~10-2.5 Msolar yr-1, consistent with the accretion-based scenario of massive star formation. With the fitted accretion rates and with mass estimates of up to ~20 Msolar for these objects, it appears plausible that stars with stellar masses M*>20 Msolar can form via accretion.

Fazal, F. M.; Sridharan, T. K.; Qiu, K.; Robitaille, T.; Whitney, B.; Zhang, Q.

2008-11-01

308

Hard X-ray light curves of high-mass X-ray binaries  

NASA Astrophysics Data System (ADS)

Using the 9 years of continuous data now available from the Burst and Transient Source Experiment (BATSE) aboard CGRO, we have measured orbital periods and produced folded light curves for eight high-mass X-ray binaries (HMXB). Given the length of the data sets, our determinations are based on many more binary orbits than previous investigations. Thus our source detections have a high statistical significance and we are able to follow long-term trends in X-ray output. In particular, we focus on two systems: A0538-668 and EXO2030+375, both HMXBs exhibiting Type I outbursts. Recent work on A0538-668 reported a 16.65-d optical variability caused by the orbital period, but only seen during minima of a longer-term variability at 421 d. We searched for this signal in the BATSE data set but we found no evidence for such a modulation and place an upper limit of 3.0 × 10-3 photon cm-2 s-1 in the 20-70 keV BATSE energy band, based upon statistical modelling of the signal. Previous observations of EXO2030+375 using RXTE ASM data indicate secondary outbursts occur at apastron passage. We present a light curve for an earlier epoch, showing convincing evidence for such apastron outbursts. We find apastron outbursts in three sources, all having orbital periods greater than 41 d. No such signal is conclusively detected in the more rapidly orbiting systems studied.

Laycock, S.; Coe, M. J.; Wilson, C. A.; Harmon, B. A.; Finger, M.

2003-01-01

309

Velocity, Density, and Magnetic Field Structure in High-Mass Star Forming Regions  

NASA Astrophysics Data System (ADS)

To understand the detailed structure of four representative high-mass star forming regions, we have performed a comparative analysis of magnetic field structure; mass and velocity structure; and local features such as HII regions, outflows, and infrared sources. This work considers areas 5-15arcmin on a side in Orion A (BN/KL and Bar regions), NGC 2024, W3 Main, and M17. Primary data include (13) CO J=1-0 maps with 50arcsec spatial resolution and 0.1 km\\:s(-1) velocity resolution as well as 100 micron dust emission polarization maps with 35arcsec resolution (provided by J.L. Dotson, C.D. Dowell, D. Schleuning, and R.H. Hildebrand). These recently obtained emission polarization maps represent reliable probes of the projected magnetic field direction in dense clouds. We isolate velocity components in the spectra and then go on to analyze patterns in linewidth, component velocity, column density, polarization percentage, polarization direction, and dispersion in polarization position angle. Our analysis also makes use of field strength measurements and other data in the literature to form a coherent physical picture of what is happening in each source. By comparing the relative importance of magnetic, kinetic, and gravitational energies as well as the dynamical significance of such energetic features as HII regions and outflows, we evaluate the role of the magnetic field in each region.

Kannappan, S. J.; Goodman, A. A.

1995-12-01

310

Standardization of Comparison Stars in the Fields of 10 High Mass X-ray Binaries  

NASA Astrophysics Data System (ADS)

To support our current observing program to monitor High Mass X-ray Binary (HMXB) systems for optical variability, we calibrated a large sample of comparison stars in the fields of ten HMXB systems. This was done using the new BYU West Mountain 0.9-m telescope. Calibrations were done in the B, V, and I filter with Landolt standard fields. Two of our systems, 4U 1907+09 and KS 1947+300, had previously published magnitudes for the optical counterpart of each x-ray system. The eight remaining systems had no identified optical counterparts. These systems include: AXJ1844.8-0258, 4U 1850-03, 4U 1901+03, 4U 1908+075, XTE J1906+090, XTE J1908+094, IGR J19140+0951, and IGR 18410-0535. We will report on the calibrations for each field and an attempt to identify each optical counterpart. This work is supported by NSF grants AST-0618209. We also acknowledge support from a BYU ORCA MEG grant.

Hintz, Eric G.; Joner, M. D.

2011-01-01

311

Clustering between High-mass X-Ray Binaries and OB Associations in the Milky Way  

NASA Astrophysics Data System (ADS)

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? 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-1. The characteristic scale of the correlation function suggests an average kinematical age (since the supernova phase) of ~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.

Bodaghee, A.; Tomsick, J. A.; Rodriguez, J.; James, J. B.

2012-01-01

312

Clustering Between High-Mass X-Ray Binaries and OB Associations in the Milky Way  

NASA Astrophysics Data System (ADS)

We present the first direct measurement of the spatial cross-correlation function of high-mass X-ray binaries (HMXBs) and active OB associations in the Milky Way. This result relied on a sample containing 79 hard X-ray detected HMXBs and 458 OB associations. Clustering between the two populations is detected with a significance above 7-sigmas 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 minimum separation of 0.4±0.2 kpc between OB associations and HMXBs is consistent with the view that the latter have large runaway velocities ( 100 km s-1). This suggests that the offset is mostly due to natal kicks acquired by the binary during the supernova phase (with a few exceptions). The characteristic scale of the correlation function indicates an average kinematical age (i.e., time between the supernova and X-ray phase) of 4 Myr for the HMXB population. Despite being derived from the "grand design" of our Galaxy, these signatures of HMXB evolution are consistent with theoretical expectations and observations of individual objects.

Bodaghee, Arash; Tomsick, J. A.; Rodriguez, J.; James, B. J.

2011-09-01

313

Observations of the High-mass X-Ray Binary A 0535+26 in Quiescence  

NASA Astrophysics Data System (ADS)

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 ~2 to <1 × 10-11 erg cm-2 s-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.

Rothschild, Richard; Markowitz, Alex; Hemphill, Paul; Caballero, Isabel; Pottschmidt, Katja; Kühnel, Matthias; Wilms, Jörn; Fürst, Felix; Doroshenko, Victor; Camero-Arranz, Ascension

2013-06-01

314

The superslow pulsation X-ray pulsars in high mass X-ray binaries  

NASA Astrophysics Data System (ADS)

There exists a special class of X-ray pulsars that exhibit very slow pulsation of P spin > 1000 s in the high mass X-ray binaries (HMXBs). We have studied the temporal and spectral properties of these superslow pulsation neutron star binaries in hard X-ray bands with INTEGRAL observations. Long-term monitoring observations find spin period evolution of two sources: spin-down trend for 4U 2206+54 (P spin ~ 5560 s with ? spin ~ 4.9 × 10-7 s s-1) and long-term spin-up trend for 2S 0114+65 (P spin ~ 9600 s with ? spin ~ -1 × 10-6 s s-1) in the last 20 years. A Be X-ray transient, SXP 1062 (P spin ~ 1062 s), also showed a fast spin-down rate of ? spin ~ 3 × 10-6 s s-1 during an outburst. These superslow pulsation neutron stars cannot be produced in the standard X-ray binary evolution model unless the neutron star has a much stronger surface magnetic field (B > 1014 G). The physical origin of the superslow spin period is still unclear. The possible origin and evolution channels of the superslow pulsation X-ray pulsars are discussed. Superslow pulsation X-ray pulsars could be younger X-ray binary systems, still in the fast evolution phase preceding the final equilibrium state. Alternatively, they could be a new class of neutron star system - accreting magnetars.

Wang, Wei

2013-03-01

315

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

SciTech Connect

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.

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

316

The Spatial Structure of Young Stellar Clusters in High-Mass Star-Forming Regions  

NASA Astrophysics Data System (ADS)

The spatial distributions of young stars in star-forming regions can be linked to the theory of clustered star formation using spatial statistical methods. The MYStIX project (Massive Young stellar clusters Study in Infrared and X-rays) provides rich samples of young stars from the nearest high-mass star-forming regions. Maps of stellar surface density reveal diverse structure and subclustering. Young stellar clusters and subclusters are fit with isothermal spheres and ellipsoids using the Bayesian Information Criterion to estimate the number of subclusters. We investigate the relation between (sub)cluster size and density and examine evidence for dynamical relaxation in some of the (sub)clusters. Clustering properties are also measured using Cartwright and Whitworth's Q statistic and the inhomogeneous two-point correlation function, which can be used to distinguish between centrally concentrated and fractal distributions. Mass segregation is detected in several cases, in both centrally concentrated and fractally structured star clusters, but a few clusters are not mass segregated. We discuss the astrophysical implications of the comparison of cluster structures in the different regions.

Kuhn, Michael

2013-01-01

317

Neutron star masses from hydrodynamical effects in obscured supergiant high mass X-ray binaries  

NASA Astrophysics Data System (ADS)

Context. A population of obscured supergiant high mass X-ray binaries has been discovered by INTEGRAL. X-ray wind tomography of IGR J17252-3616 inferred a slow wind velocity to account for the enhanced obscuration. Aims: The main goal of this study is to understand under which conditions high obscuration could occur. Methods: We have used an hydrodynamical code to simulate the flow of the stellar wind around the neutron star. A grid of simulations was used to study the dependency of the absorbing column density and of the X-ray light-curves on the model parameters. A comparison between the simulation results and the observations of IGR J17252-3616 provides an estimate on these parameters. Results: We have constrained the wind terminal velocity to 500-600 km s-1 and the neutron star mass to 1.75-2.15 M?. Conclusions: We have confirmed that the initial hypothesis of a slow wind velocity with a moderate mass loss rate is valid. The mass of the neutron star can be constrained by studying its impact on the accretion flow.

Manousakis, A.; Walter, R.; Blondin, J. M.

2012-11-01

318

Confirmation of the exclusive association between 6.7-GHz methanol masers and high-mass star formation regions  

NASA Astrophysics Data System (ADS)

Recently, a comparison between the locations of 6.7-GHz methanol masers and dust continuum emission has renewed speculation that these masers can be associated with evolved stars. The implication of such a scenario would be profound, especially for the interpretation of large surveys for 6.7-GHz masers, individual studies where high-mass star formation has been inferred from the presence of 6.7-GHz methanol masers and for the pumping mechanisms of these masers. We have investigated the two instances where 6.7-GHz methanol masers have been explicitly suggested to be associated with evolved stars, and we find the first to be associated with a standard high-mass star formation region, and the second to be a spurious detection. We also find no evidence to suggest that the methanol maser action can be supported in the environments of evolved stars. We thereby confirm their exclusive association with high-mass star formation regions.

Breen, S. L.; Ellingsen, S. P.; Contreras, Y.; Green, J. A.; Caswell, J. L.; Stevens, J. B.; Dawson, J. R.; Voronkov, M. A.

2013-10-01

319

a Study of Charmed Meson Decays Using the 500 GEV Negative Pion Beam at the Fermi National Accelerator Laboratory  

NASA Astrophysics Data System (ADS)

Using 30% of the data from the Fermilab experiment E791, I have studied the substructure of the singly Cabibbo suppressed decays D^0 to K_sp {S}{0}K^{+/-} pi^mp and have made comparisons with the Cabibbo allowed decay D^0 to K_sp{S}{0}pi^+ pi^-. I see a clear K_sp {S}{0}Kpi signal from the resonant decay D^0 to K^ {* +}K^- but no signals are observed in the K^+K^{* -}, K^0| K^ {* 0}, | K^0K ^{* 0} or in non-resonant modes. I report an absolute branching ratio of (1.1 +/- 0.2 +/- 0.2) for the resonant decay D^0 to K^{ * +}K^-. 90% confidence level upper limits are reported for the other resonant and non -resonant decays contributing to the final states K _sp{S}{0}K^{+/- }pi^{mp}.

Santha, Attanagoda K. S.

320

Decay of an excited atom near an absorbing microsphere  

NASA Astrophysics Data System (ADS)

Spontaneous decay of an excited atom near a dispersing and absorbing microsphere of given complex permittivity that satisfies the Kramers-Kronig relations is studied, with special emphasis on a Drude-Lorentz permittivity. Both the whispering gallery field resonances below the band gap (for a dielectric sphere) and the surface-guided field resonances inside the gap (for a dielectric or a metallic sphere) are considered. Since the decay rate mimics the spectral density of the sphere-assisted ground-state fluctuation of the radiation field, the strengths and widths of the field resonances essentially determine the feasible enhancement of spontaneous decay. In particular, strong enhancement can be observed for transition frequencies within the interval in which the surface-guided field resonances strongly overlap. When material absorption becomes significant, then the highly structured emission pattern that can be observed when radiative losses dominate, reduces to that of a strongly absorbing mirror. Accordingly, nonradiative decay becomes dominant. In particular, if the distance between the atom and the surface of the microsphere is small enough, the decay becomes purely nonradiative.

Dung, Ho Trung; Knöll, Ludwig; Welsch, Dirk-Gunnar

2001-07-01

321

Leptonic B Decays at BaBar  

SciTech Connect

We will present the most recent results on leptonic B decays B{sup {+-}(0)} {yields} K*{sup {+-}(0)}{nu}{bar {nu}} and B{sup {+-}} {yields} {mu}{sup {+-}}{nu}, based on the data collected by the BaBar detector at PEP-II, an asymmetric e{sup +}e{sup -} collider at the center of mass energy of the {Upsilon}(4S) resonance. Rare B decays have always been a standard probe for New Physics (NP) searches. The very low Standard Model (SM) rate of these decays often make them unaccessible with the present experimental datasets, unless NP effects enhance the rate up to the current experimental sensitivity. Moreover, as NP effects can modify the decay kinematic, particular attention must be paid in order to perform a model independent analysis. A B-Factory provides an unique environment to investigate these processes. The high number of B{bar B} pairs produced by a B-Factory often allows to approach the needed experimental sensitivity. Moreover, the clean environment and the closed kinematic of the initial state enable to obtaining a very pure sample where to look for these decays.

Baracchini, Elisabetta; /Rome U. /INFN, Rome

2011-11-10

322

Leptonic B Decays at BaBar  

SciTech Connect

The authors will present the most recent results on leptonic B decays B{sup {+-}(0)} {yields} K*{sup {+-}(0)} {nu}{bar {nu}} and B{sup {+-}} {yields} {mu}{sup {+-}}{nu}, based on the data collected by the BaBar detector at PEP-II, an asymmetric e{sup +}e{sup -} collider at the center of mass energy of the {Upsilon}(4S) resonance. Rare B decays have always been a standard probe for New Physics (NP) searches. The very low Standard Model (SM) rate of these decays often make them unaccessible with the present experimental datasets, unless NP effects enhance the rate up to the current experimental sensitivity. Moreover, as NP effects can modify the decay kinematic, particular attention must be payed in order to perform a model independent analysis. A B-Factory provides an unique environment where to investigate these processes. The high number of B{bar B} pairs produced by a B-Factory often allows to approach the needed experimental sensitivity. Moreover, the clean environment and the closed kinematic of the initial state enable to obtaining a very pure sample where to look for these decays.

Monorchio, Diego; /INFN, Naples /Naples U.

2011-09-13

323

Hadron-Decay Widths.  

National Technical Information Service (NTIS)

Using a covariant formalism the author parametrizes two-body decays in terms of coupling constants and assume the lowest-order angular momentum barrier coupling to dominate. From a knowledge of the baryon decays an estimate of the order of magnitude of th...

T. J. Weare

1967-01-01

324

Nuclear ?-decay. II  

Microsoft Academic Search

A general expression for the beta-decay transition amplitude is evaluated, using the decomposition of the nuclear current matrix element into beta-decay form factors as obtained in the previous paper. For the electron radial wave functions the finite nuclear size is taken into account. Formulas for the spectrum shape factor and the polarisation are calculated.

Lothar Schülke

1964-01-01

325

Simulation of nuclear decay  

Microsoft Academic Search

The present article depicts a software module to prepare the particles and quanta emitted during the disintegration of nuclides with complex decay schemes. This program is particularly useful for Monte Carlo simulations involving detectors showing pulse-summation effects. It generates the decay-scheme dependant input to trace the interactions of the emitted particles (and the secondary particles created) with a particular detector;

Jean-Pascal Laedermann; Marc Décombaz

2000-01-01

326

Neutrinoless double beta decay  

SciTech Connect

Present status of the search for 0{nu}{beta}{beta} decay and of the related theoretical questions is reviewed. The mechanism of the decay, and how to recognize it, is discussed first, followed by the relation of the effective neutrino Majorana mass and the oscillation parameters, and the problems of nuclear matrix elements. The planned {approx} 100 kg experiments are briefly described.

Vogel, Petr [Kellogg Radiation Lab. 106-38, Caltech, Pasadena, CA 91125 (United States)

2006-11-17

327

Radioactive Decay - An Analog.  

ERIC Educational Resources Information Center

|Presents an analog of radioactive decay that allows the student to grasp the concept of half life and the exponential nature of the decay process. The analog is devised to use small, colored, plastic poker chips or counters. Provides the typical data and a graph which supports the analog. (YP)|

McGeachy, Frank

1988-01-01

328

Radioactive decay data tables  

Microsoft Academic Search

The estimation of radiation dose to man from either external or internal exposure to radionuclides requires a knowledge of the energies and intensities of the atomic and nuclear radiations emitted during the radioactive decay process. The availability of evaluated decay data for the large number of radionuclides of interest is thus of fundamental importance for radiation dosimetry. This handbook contains

Kocher

1981-01-01

329

Time evolution of decay of two identical quantum particles  

SciTech Connect

An analytical solution for the time evolution of decay of two identical noninteracting quantum particles seated initially within a potential of finite range is derived using the formalism of resonant states. It is shown that the wave function, and hence also the survival and nonescape probabilities, for factorized symmetric and entangled symmetric or antisymmetric initial states evolve in a distinctive form along the exponentially decaying and nonexponential regimes. Our findings show the influence of the Pauli exclusion principle on decay. We exemplify our results by solving exactly the s-wave {delta} shell potential model.

Garcia-Calderon, Gaston; Mendoza-Luna, Luis Guillermo [Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Apartado Postal 20-364, Mexico 01000, Distrito Federal (Mexico)

2011-09-15

330

Rare {Lambda}{sub b} decays in a quark model  

SciTech Connect

Hadronic form factors for the rare weak transitions {Lambda}{sub b{yields}{Lambda}}{sup (*)} are calculated using a nonrelativistic quark model. The form factors obtained in this way are found to satisfy the relationships expecetd from the heavy quark effective theory. Differential decay rates and branching ratios are calculated for the dileptonic decays {Lambda}{sub b{yields}{Lambda}}{sup (*)}l{sup +}l{sup -}, for both ground state and excited daughter baryons. Inclusion of the long distance contributions from charmonium resonances significantly enhances the decay rates. Future work is outlined.

Mott, L.; Roberts, W. [Department of Physics, Florida State University, Tallahassee, FL 32306 (United States)

2010-08-05

331

Enhanced observability of quantum postexponential decay using distant detectors  

SciTech Connect

We study the elusive transition from exponential to postexponential (algebraic) decay of the probability density of a quantum particle emitted by an exponentially decaying source in one dimension. The main finding is that the probability density at the transition time, and thus its observability, increases with the distance of the detector from the source up to a critical distance beyond which exponential decay is no longer observed. Solvable models provide explicit expressions for the dependence of the transition on resonance and observational parameters, facilitating the choice of optimal conditions.

Torrontegui, E.; Muga, J. G. [Departamento de Quimica-Fisica, Universidad del Pais Vasco, Apartado 644, Bilbao 48080 (Spain); Martorell, J. [Departament d'Estructura i Constituents de la Materia, Facultat Fisica, University of Barcelona, Barcelona 08028 (Spain); Sprung, D. W. L. [Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada)

2009-07-15

332

Hadronic and radiative decays of the tau lepton  

NASA Astrophysics Data System (ADS)

This PhD thesis studies some hadronic and radiative decays of the tau lepton using a Chiral Lagrangian including resonance fields. After a theoretical introduction, the decays to the (? ? ?)^-, (KK?)^- and ?^{(')} ?^- ?^0 hadronic states and ? to (?/K)^- ? ?_tau are analysed. Some material, which was not included in the corresponding references, is also discussed: The structure functions analysis for the 3 pion modes, the differential decay width as a function of the two-particle invariant masses in the considered three-meson modes and a simplified study of the ?to?^{(')} ?^- ?^0 ?_tau processes within a single-angle mixing scheme for the ? and ?^' mesons.

Roig, Pablo

2013-01-01

333

Decays of J/psi (3100) to baryon final states  

SciTech Connect

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.

Eaton, M.W.

1982-05-01

334

Radioactive Decay Model  

NSDL National Science Digital Library

The EJS Radioactive Decay Model simulates the decay of a radioactive sample using discrete random events. It displays the number of radioactive nuclei as a function of time. You can change the initial number of nuclei and the decay constant as well as changing the plot to a semi-log plot. The Radioactive Decay model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_ms_explicit_RadioactiveDecay.jar file will run the program if Java is installed. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Christian, Wolfgang

2009-01-23

335

Evidence for superdeformed shape isomeric states in [sup 28]Si at excitations above 40 MeV through observations of selective particle decays of [sup 16]O+[sup 12]C resonances in [sup 8]Be and alpha channels  

SciTech Connect

Excitation functions of the reactions [sup 12]C([sup 16]O,[sup 8]Be)[sup 20]Ne and [sup 12]C([sup 16]O,[sup 4]He)[sup 24]Mg leading to several states have been measured in the range [ital E][sub c.m.]=25.7--38.6 MeV. From cross channel correlation analysis two intermediate resonance structures at [ital E][sub c.m.]=26.9 and 29.5 MeV corresponding to excitation energies of 43.7 and 46.2 MeV in [sup 28]Si have been identified. Angular distribution measurements for [sup 12]C([sup 16]O,[sup 4]He)[sup 24]Mg[sub g.s.] have also been made at the lower resonance at [ital E][sub c.m.]=26.9 MeV which enable spin assignment of [ital J][sup [pi

Eswaran, M.A.; Kumar, S.; Mirgule, E.T.; Chakrabarty, D.R.; Datar, V.M.; Ragoowansi, N.L.; Pal, U.K. (Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 400 085 (India))

1993-04-01

336

Physical properties of high-mass clumps in different stages of evolution  

NASA Astrophysics Data System (ADS)

Context. The details of the process of massive star formation are still elusive. A complete characterization of the first stages of the process from an observational point of view is needed to constrain theories on the subject. In the past 20 years we have made a thorough investigation of colour-selected IRAS sources over the whole sky. The sources in the northern hemisphere were studied in detail and used to derive an evolutionary sequence based on their spectral energy distribution. Aims: To investigate the first stages of the process of high-mass star formation, we selected a sample of massive clumps previously observed with the Swedish-ESO Submillimetre Telescope at 1.2 mm and with the ATNF Australia Telescope Compact Array at 1.3 cm. We want to characterize the physical conditions in such sources, and test whether their properties depend on the evolutionary stage of the clump. Methods: With ATCA we observed the selected sources in the NH3(1, 1) and (2, 2) transitions and in the H2O(616-523) maser line. Ammonia lines are a very good temperature probe that allow us to accurately determine the mass and the column, volume, and surface densities of the clumps. We also collected all data available to construct the spectral energy distribution of the individual clumps and to determine if star formation is already occurring through observations of its most common signposts, thus putting constraints on the evolutionary stage of the source. We fitted the spectral energy distribution between 1.2 mm and 70 ?m with a modified black body to derive the dust temperature and independently determine the mass. Results: We find that the clumps are cold (T ~ 10-30 K), massive (M ~ 102-103 M?), and dense (n(H2) ? 105 cm-3) and that they have high column densities (N(H2) ~ 1023 cm-2). All clumps appear to be potentially able to form high-mass stars. The most massive clumps appear to be gravitationally unstable, if the only sources of support against collapse are turbulence and thermal pressure, which possibly indicates that the magnetic field is important in stabilizing them. Conclusions: After investigating how the average properties depend on the evolutionary phase of the source, we find that the temperature and central density progressively increase with time. Sources likely hosting a ZAMS star show a steeper radial dependence of the volume density and tend to be more compact than starless clumps. Partly based on observations with the Herschel satellite. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Appendices are available in electronic form at http://www.aanda.org

Giannetti, A.; Brand, J.; Sánchez-Monge, Á.; Fontani, F.; Cesaroni, R.; Beltrán, M. T.; Molinari, S.; Dodson, R.; Rioja, M. J.

2013-08-01

337

Three-dimensional Models of Embedded High-Mass Stars: Effects of a Clumpy Circumstellar Medium  

NASA Astrophysics Data System (ADS)

We use three-dimensional radiative transfer models to show the effects of clumpy circumstellar material on the observed infrared colors of high-mass stars embedded in molecular clouds. We highlight differences between three-dimensional clumpy and one-dimensional smooth models that can affect the interpretation of data. We discuss several important properties of the emergent spectral energy distribution (SED). More near-infrared light (scattered and direct from the central source) can escape than in smooth one-dimensional models. The near- and mid-infrared SED of the same object can vary significantly with viewing angle, depending on the clump geometry along the sight line. Even the wavelength-integrated flux can vary with angle by more than a factor of 2. Objects with the same average circumstellar dust distribution can have very different near- and mid-IR SEDs, depending on the clump geometry and the proximity of the most massive clump to the central source. Although clumpiness can cause similar objects to have very different SEDs, there are some observable trends. Near- and mid-infrared colors are sensitive to the weighted average distance of clumps from the central source and to the magnitude of clumpy density variations (smooth-to-clumpy ratio). Far-infrared emission remains a robust measure of the total dust mass. We present simulated SEDs, colors, and images for 2MASS and Spitzer filters. We compare them to observations of some ultracompact H II regions and find that three-dimensional clumpy models fit better than smooth models. In particular, clumpy models with fractal dimensions in the range 2.3-2.8, smooth-to-clumpy ratios of <~50%, and density distributions with shallow average radial density profiles fit the SEDs best (~r?, -1.0

Indebetouw, R.; Whitney, B. A.; Johnson, K. E.; Wood, K.

2006-01-01

338

OBSERVATIONS OF A HIGH-MASS PROTOSTAR IN NGC 7538 S  

SciTech Connect

We present high angular resolution continuum observations of the high-mass protostar NGC 7538 S with BIMA and CARMA at 3 and 1.4 mm, Very Large Array (VLA) observations at 1.3, 2, 3.5, and 6 cm, and archive Infrared Array Camera (IRAC) observations from the Spitzer Space Observatory, which detect the star at 4.5, 5.8, and 8 {mu}m. The star looks rather unremarkable in the mid-IR. The excellent positional agreement of the IRAC source with the VLA free-free emission, the OH, CH{sub 3}OH, H{sub 2}O masers, and the dust continuum confirms that this is the most luminous object in the NGC 7538 S core. The continuum emission at millimeter wavelengths is dominated by dust emission from the dense cold cloud core surrounding the protostar. Including all array configurations, the emission is dominated by an elliptical source with a size of {approx}8'' Multiplication-Sign 3''. If we filter out the extended emission we find three compact millimeter sources inside the elliptical core. The strongest one, S{sub A}, coincides with the VLA/IRAC source and resolves into a double source at 1.4 mm, where we have subarcsecond resolution. The measured spectral index, {alpha}, between 3 and 1.4 mm is {approx}2.3, and steeper at longer wavelengths, suggesting a low dust emissivity or that the dust is optically thick. We argue that the dust in these accretion disks is optically thick and estimate a mass of an accretion disk or infalling envelope surrounding S{sub A} to be {approx}60 M{sub Sun }.

Wright, Melvyn [Radio Astronomy Laboratory, University of California, Berkeley 601 Campbell Hall, Berkeley, CA 94720 (United States); Zhao Junui [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Sandell, Goeran [NASA Ames Research Center, SOFIA-USRA, Mail Stop 211-3, Building N211, Rm. 249, P.O. Box 1, Moffett Field, CA 94035-0001 (United States); Corder, Stuartt [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Goss, W. M. [National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801 (United States); Zhu Lei [Department of Astronomy, Peking University, Beijing 100871 (China)

2012-02-20

339

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

NASA Astrophysics Data System (ADS)

Modern stellar evolutionary tracks are used to calculate the evolution of a very large number of massive binary star systems (Mtot 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.

Dalton, William W.; Sarazin, Craig L.

1995-02-01

340

Suppression and coherent control of free-induction-decay emission in multilevel systems  

SciTech Connect

In this paper, I study the coherent control and suppression of the free-induction-decay emission associated with the decay from an excited multilevel atom to its ground state. It is shown here that a strong and ultrashort coupling pulse, resonant with the excited states and a lower state other than the ground state, can induce destructive quantum interferences in the decay process. The suppression is temporary and the free-induction-decay signal reappears one quantum-beat period (of the excited states) later. A sequence of equally spaced, ultrashort coupling pulses can control the moment the free-induction-decay emission occurs.

Araujo, Luis E. E. de [Instituto de Fisica 'Gleb Wataghin', Universidade Estadual de Campinas, Campinas, Sao Paulo 13083-970 (Brazil)

2006-10-15

341

An estimate of the supernova kick velocities for high-mass X-ray binaries in the Small Magellanic Cloud  

Microsoft Academic Search

This work investigates the possible supernova kick velocities imposed on high-mass X-ray binary (HMXB) systems in the Small Magellanic Cloud. Comparisons are made between the location of such systems and the locations of young stellar clusters on the premise that these may represent the birthplace of many of these systems. Measurements of the separation of clusters and HMXBs, and an

M. J. Coe

2005-01-01

342

On the origin of black hole spin in high-mass black hole binaries: Cygnus X-1  

Microsoft Academic Search

To date, there have been several detections of high-mass black hole binaries in both the Milky Way and other galaxies. For some of these, the spin parameter of the black hole has been estimated. As many of these systems are quite tight, a suggested origin of the spin is angular momentum imparted by the synchronous rotation of the black hole

Magnus Axelsson; Ross P. Church; Melvyn B. Davies; Andrew J. Levan; Felix Ryde

2011-01-01

343

Search for high-mass diphoton states and limits on Randall-Sundrum gravitons at CDF.  

PubMed

We have performed a search for new particles which decay to two photons using 1.2 fb(-1) of integrated luminosity from pp[over] collisions at square root s = 1.96 TeV collected using the CDF II detector at the Fermilab Tevatron. We find the diphoton mass spectrum to be in agreement with the standard model expectation, and set limits on the cross section times branching ratio for the Randall-Sundrum graviton, as a function of diphoton mass. We subsequently derive lower limits for the graviton mass of 230 GeV/c(2) and 850 GeV/c(2), at the 95% confidence level, for coupling parameters (k/M[over](Pl)) of 0.01 and 0.1, respectively. PMID:17995317

Aaltonen, T; Abulencia, A; Adelman, J; Affolder, T; Akimoto, T; Albrow, M G; Amerio, S; Amidei, D; Anastassov, A; Anikeev, K; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Azzi-Bacchetta, P; Azzurri, P; Bacchetta, N; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Baroiant, S; Bartsch, V; Bauer, G; Beauchemin, P-H; Bedeschi, F; Behari, S; Bellettini, G; Bellinger, J; Belloni, A; Benjamin, D; Beretvas, A; Beringer, J; Berry, T; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bolla, G; Bolshov, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; 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; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carrillo, S; Carlsmith, D; Carosi, R; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, I; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Cilijak, M; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Coca, M; Compostella, G; Convery, M E; Conway, J; Cooper, B; Copic, K; Cordelli, M; Cortiana, G; Crescioli, F; Cuenca Almenar, C; Cuevas, J; Culbertson, R; Cully, J C; DaRonco, S; Datta, M; D'Auria, S; Davies, T; Dagenhart, D; de Barbaro, P; De Cecco, S; Deisher, A; De Lentdecker, G; De Lorenzo, G; Dell'Orso, M; Delli Paoli, F; Demortier, L; Deng, J; Deninno, M; De Pedis, D; Derwent, P F; Di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Dörr, C; Donati, S; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, I; Fedorko, W T; Feild, R G; Feindt, M; Fernandez, J P; Field, R; Flanagan, G; Forrest, R; Forrester, S; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; Garcia, J E; Garberson, F; Garfinkel, A F; Gay, C; Gerberich, H; Gerdes, D; Giagu, S; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Goldstein, J; 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; Hamilton, A; Han, B-Y; Han, J Y; Handler, R; Happacher, F; Hara, K; Hare, D; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hauser, J; Hays, C; Heck, M; Heijboer, A; Heinemann, B; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hidas, D; Hill, C S; Hirschbuehl, D; Hocker, A; Holloway, A; Hou, S; Houlden, M; Hsu, S-C; Huffman, B T; Hughes, R E; Husemann, U; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; Iyutin, B; James, E; Jang, D; Jayatilaka, B; Jeans, D; Jeon, E J; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Karchin, P E; Kato, Y; Kemp, Y; Kephart, R; Kerzel, U; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Klute, M; Knuteson, B; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kraan, A C; Kraus, J; Kreps, M; Kroll, J; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhlmann, S E; Kuhr, T; Kulkarni, N P; Kusakabe, Y; Kwang, S; Laasanen, A T; Lai, S; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; Lecompte, T; Lee, J; Lee, J; Lee, Y J; Lee, S W; Lefèvre, R; Leonardo, N; Leone, S; Levy, S; Lewis, J D; Lin, C; Lin, C S; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Lu, R-S; Lucchesi, D; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Lytken, E; Mack, P; Macqueen, D; Madrak, R; Maeshima, K; Makhoul, K; Maki, T; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis, A; Margaroli, F; Marginean, R; Marino, C; Marino, C P; Martin, A; Martin, M; Martin, V; Martínez, M; Martínez-Ballarín, R; Maruyama, T; Mastrandrea, P; Masubuchi, T; Matsunaga, H; Mattson, M E; Mazini, R; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzemer, S; Menzione, A; Merkel, P; Mesropian, C; Messina, A; Miao, T; Miladinovic, N; Miles, J; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyamoto, A; Moed, S; Moggi, N; Mohr, B; Moon, C S; Moore, R; Morello, M; Fernandez, P Movilla; Mülmenstädt, J; Mukherjee, A; Muller, Th; Mumford, R; Murat, P; Mussini, M; Nachtman, J; Nagano, A; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Necula, V; Neu, C; Neubauer, M S

2007-10-22

344

Strong decays of newly observed D{sub sJ} states in a constituent quark model with effective Lagrangians  

SciTech Connect

The strong decay properties of the newly observed states D{sub sJ}(3040), D{sub sJ}(2860), and D{sub sJ}(2710) are studied in a constituent quark model with quark-meson effective Lagrangians. We find that the D{sub sJ}(3040) could be identified as the low-mass physical state |2P{sub 1}>{sub L} (J{sup P}=1{sup +}) from the D{sub s}(2{sup 1}P{sub 1})-D{sub s}(2{sup 3}P{sub 1}) mixing. The D{sub sJ}(2710) is likely to be the low-mass mixed state |(SD)>{sub L} via the 1{sup 3}D{sub 1}-2{sup 3}S{sub 1} mixing. In our model, the D{sub sJ}(2860) cannot be assigned to any single state with a narrow width and compatible partial widths to DK and D*K. Thus, we investigate a two-state scenario as proposed in the literature. In our model, one resonance is likely to be the 1{sup 3}D{sub 3} (J{sup P}=3{sup -}), which mainly decays into DK. The other resonance seems to be the |1D{sub 2}{sup '}>{sub H}, i.e. the high-mass state in the 1{sup 1}D{sub 2}-1{sup 3}D{sub 2} mixing with J{sup P}=2{sup -}, of which the D*K channel is its key decay mode. We also discuss implications arising from these assignments and give predictions for their partner states such as |(SD){sup '}>{sub H}, |2P{sub 1}{sup '}>{sub H}, 2{sup 3}P{sub 0}, and 2{sup 3}P{sub 2}, which could be helpful for the search for these new states in future experiments.

Zhong Xianhui [Department of Physics, Hunan Normal University, and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Changsha 410081 (China); Theoretical Physics Center for Science Facilities, CAS, Beijing 100049 (China); Zhao Qiang [Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China); Theoretical Physics Center for Science Facilities, CAS, Beijing 100049 (China)

2010-01-01

345

Fragmentation and dynamical collapse of the starless high-mass star-forming region IRDC 18310-4  

NASA Astrophysics Data System (ADS)

Context. Because of their short evolutionary time-scales, the earliest stages of high-mass star formation prior to the existence of any embedded heating source have barely been characterized until today. Aims: We study the fragmentation and dynamical properties of a massive starless gas clump at the onset of high-mass star formation. Methods: Based on Herschel continuum data we identify a massive gas clump that remains far-infrared dark up to 100 ?m wavelengths. The fragmentation and dynamical properties are investigated by means of Plateau de Bure Interferometer and Nobeyama 45 m single-dish spectral line and continuum observations. Results: The massive gas reservoir (between ~800 and ~1600 M?, depending on the assumed dust properties) fragments at spatial scales of ~18 000 AU in four cores. Comparing the spatial extent of this high-mass region with intermediate- to low-mass starless cores from the literature, we find that linear sizes do not vary significantly over the whole mass regime. However, the high-mass regions squeeze much more gas into these similar volumes