We summarize the talks presented to the Absolute neutrino mass scale parallel session of NOW2010, mainly focused on neutrinoless double beta decay in its theoretical and experimental aspects and the role of the neutrino mass scale in cosmology.
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Neutrino flavor oscillation experiments have demonstrated that the three Standard Model neutrino flavor eigenstates are mixed with three mass eigenstates whose mass eigenvalues are nondegenerate. The oscillation experiments measure the differences between the squares of the mass eigenvalues but ...
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The absolute scale of neutrino masses is very important for understanding the evolution and the structure formation of the universe as well as for nuclear and particle physics beyond the present Standard Model. Complementary to deducing statements on the neutrino mass from cosmological ...
Over the past decade, experiments studying neutrinos from atmospheric, solar, and reactor sources have shown conclusively that neutrinos change flavor and, as a consequence, have a small but finite mass. Yet, the scale of neutrino masses remains an open question that is of great importance for ...
Models of late-time neutrino mass generation contain new interactions of the cosmic background neutrinos with supernova relic neutrinos (SRNs). Exchange of an on-shell light scalar may lead to significant modification of the differential SRN flux observed at earth. We consider an Abelian U(1) model for generating ...
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Neutrino-less double beta decays (0???), which violate the lepton number conservation law by ?L=2, are unique and realistic probes for studying the Majorana nature of neutrinos, the ? mass spectrum and the absolute mass scale, the lepton sector CP and others beyond the standard electro-weak ...
The current experimental status of neutrino physics is reviewed. It contains the evidences for a non-vanishing neutrino rest mass from neutrino oscillation searches. In addition an outlook is given on determining the various mixing matrix elements and mass differences more precisely with new ...
Recent achievements in the study of double-beta ({beta}{beta}) decay are presented. We discuss the potential of this process to search, beyond Standard Model physics, for the QRPA-based methods used for the calculation of the relevant nuclear matrix elements and the derivation of the neutrino mass from both {beta}{beta}-decay calculations and ...
Recent results from neutrino oscillation experiments have convincingly demonstrated that neutrinos have mass and they can mix. The neutrinoless double beta decay is the most sensitive process to determine the absolute scale of the neutrino masses, and the only one that can ...
The aim of the KArlsruhe TRItium Neutrino experiment KATRIN is the determination of the absolute neutrino mass scale down to 0.2 eV, with essentially smaller model dependence than from cosmology and neutrinoless double beta decay. For this purpose, the integral electron energy spectrum is measured close to the ...
Assuming four-neutrino mixing and massive Majorana neutrinos, we study the implications of neutrino oscillation solutions of the solar and atmospheric neutrino problems, of the results of the Liquid Scintillation Neutrino Detector (LSND) experiment and of the constraints on ...
Decay of heavy neutrinos ..nu../sub H/ ..-->.. ..nu..l..mu..e(l = e, ..mu..) has been searched for in the Brookhaven Alternting Gradient Synchrotron wide-band neutrino beam. Since no significant excess of such events was found, upper limits on the neutrino mixing matrix elements, absolute value of U/sub eH//sup ...
Annihilation of extremely energetic cosmic neutrinos on the relic-neutrino background can give rise to absorption lines at energies corresponding to formation of the electroweak gauge boson Z{sup 0}. The positions of the absorption dips are set by the masses of the relic neutrinos. Suitably intense sources of ...
The discovery of neutrino oscillation proved recently that neutrinos have non- vanishing masses in contrast to their description within the Standard Model of particle physics. However, the absolute neutrino mass scale, which is very important for particle physics as well as ...
The discovery of neutrino oscillation proved recently that neutrinos have non-vanishing masses in contrast to their description within the Standard Model of particle physics. However, the absolute neutrino mass scale, which is very important for particle physics as well as ...
In the last decade, a variety of neutrino oscillation experiments have established that there is a mass difference between neutrino flavors, without determining the absolute neutrino mass scale. The Enriched Xenon Observatory for neutrinoless double beta decay (EXO) will ...
A special Majorana model for three neutrino flavors is developed on the basis of the Pauli transformation group. In this model, the neutrinos possess a partially conserved generalized lepton (Pauli) charge that makes it possible to discriminate between neutrinos of different type. It is shown that, within the model in question, a ...
Neutrinoless double beta decay data, together with information on the absolute neutrino masses obtained from the future KATRIN experiment and/or astrophysical measurements, provide a chance to find CP violation in the lepton sector with Majorana neutrinos. We derive and discuss necessary conditions which make ...
The convincing evidences for neutrino flavor oscillation are a clear proof of non-vanishing neutrino masses. However, the absolute values of the neutrino masses cannot be determined by oscillation experiments alone. There are different approaches to set the ...
The planned rhenium ?-decay experiment, called the �Microcalorimeter Arrays for a Rhenium Experiment� (MARE), might probe the absolute mass scale of neutrinos with the same sensitivity as the Karlsruhe tritium neutrino mass (KATRIN) experiment, which will take commissioning data in 2011 and ...
The objective of the Majorana experiment is to study neutrinoless double beta decay ??(0?) with an effective Majorana-neutrino mass sensitivity near 100 meV in order to characterize theMajorana nature of the neutrino, the Majorana mass spectrum, and the absolute mass scale. ...
The theoretical progress on neutrino mass and neutrino cosmology made in china during the period 1980 to 1981 is reviewed.
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The aim of the KArlsruhe TRItium Neutrino experiment KATRIN is the direct and model independent determination of the absolute neutrino mass scale down to 0.2 eV. For this purpose, the integral electron energy spectrum will be measured close to the endpoint of molecular tritium beta decay. The electrostatic ...
The recently published cosmological bound on the absolute neutrino masses obtained from the Wilkinson microwave anisotropy probe (WMAP) data has important consequences for neutrino experiments and models. Taken at face value, the new bound excludes the determination of the absolute ...
From the experimental value of (g-2)/sub ..mu../ we derive absolute lower bounds on the masses of the supersymmetric fermionic partners of the W and Z bosons and the scalar partners of the muon and the neutrino.
The discovery of neutrino oscillation proved recently that neutrinos have non-vanishing masses in contrast to their description within the Standard Model of particle physics. However, the neutrino mass scale, which is very important for particle physics as well as for cosmology and ...
The only model-independent method to determine the absolute neutrino mass scale is still the investigation of a ? decay spectrum near its endpoint. The tritium ? decay experiments at Mainz and Troitsk have recently been finished yielding upper limits on the neutrino mass of about 2 eV. The ...
Since the recent experimental findings in the field of neutrino flavor oscillations, one of the most prominent tasks in neutrino physics has been to determine the absolute neutrino mass scale. The KATRIN experiment, which is currently being set up at Forschungszentrum Karlsruhe, Germany, will ...
Assuming 3-? mixing, massive Majorana neutrinos and neutrinoless double-beta (?0?-) decay generated only by the (V?A) charged current weak interaction via the exchange of the three Majorana neutrinos, we briefly review the predictions for the effective Majorana mass || in ?0?-decay and reanalyze the physics potential of future ...
We discuss the relation between the absolute neutrino mass scale, the effective mass measured in neutrinoless double beta decay, and the Majorana CP phases. Emphasis is placed on estimating the upper bound on the nuclear matrix element entering calculations of the double beta decay half-life. Combining the claimed ...
The recent results on neutrino oscillations and the consequent need to measure the value of the neutrino mass are briefly discussed. The operating principle of cryogenic detectors working at low temperatures, where the small heat capacity allows one to record and measure the temperature increase due to the tiny energy lost by a ...
Topics covered in the workshop include: extra-terrestrial and reactor neutrinos; accelerator neutrinos; neutrino mass; neutrino oscillations; and intense neutrino beams. (GHT)
Topics covered in the workshop include: extra-terrestrial and reactor neutrinos; accelerator neutrinos; neutrino mass; neutrino oscillations; and intense neutrino beams. (ERA citation 06:029442)
One of the most fundamental tasks facing nuclear and particle physics today is the determination of the absolute mass scale of neutrinos. The Karlsruhe Tritium Neutrino experiment (KATRIN) is a next generation tritium ? decay experiment capable of performing a high precision direct measurement of the ...
The paper treats recent experiments measuring the endpoint region of tritium ?-decay with high resolution, sensitivity and background rejection, using an electrostatic filter with adiabatic magnetic collimation. The spectra are analysed with respect to the neutrino mass. These results form the primary source for the present upper limit of the ...
We show that an improved sensitivity on effective neutrino mass to the atmospheric neutrino mass scale with the next generation germanium-based double-beta decay experiment together with results from cosmology survey, ? measurements and neutrino oscillation experiments may be able to determine ...
Recent results from neutrino oscillation experiments have convincingly demonstrated that neutrinos have mass and they can mix. The neutrinoless double beta (0???) decay is the most sensitive process to determine the absolute scale of the neutrino masses, and the only one ...
Thin sources of radioactive /sup 169/Yb were prepared as an absolute energy reference for beta -rays from tritium decay in the neutrino mass measurement. The isotope /sup 169/Yb was produced by bombarding erbium metal with alpha particles, and was separat...
The distinction between the information necessary to evaluate calibration of a /sup 81/Br solar neutrino detector and that necessary to determine the absolute /sup 81/Kr-/sup 81/Br mass difference is pointed out.
Resonant annihilation of extremely high-energy cosmic neutrinos on big-bang relic anti-neutrinos (and vice versa) into Z-bosons leads to sizable absorption dips in the neutrino flux to be observed at Earth. The high-energy edges of these dips are fixed, via the resonance energies, by the neutrino ...
For a significant fraction of the history of the universe, neutrinos freely fall through spacetime. While they only weakly interact with matter, neutrinos have a significant impact in astrophysics. Experimental neutrino physics and observational cosmology are amidst an interesting era, where precision measurements in both fields have ...
The impact in neutrino physics of the recent results on oscillations and the consequent need to measure the value of the neutrino mass are briefly discussed. The operating principle of cryogenic detectors working at low temperatures, where the small heat capacity allows to record and measure the temperature increase due to the tiny ...
Neutrino oscillation experiments have shown that neutrino are massive particles, but they are not able to determine the absolute neutrino mass scale. The experiments dedicated to effective electron-neutrino mass determination are the ones based on ...
We study the phenomenology of the type-II seesaw model at a linear e-e- collider. We show that the process e-e-??-?- (?, ?=e, ?, ? being charged leptons) mediated by a doubly charged scalar is very sensitive to the neutrino parameters, in particular, the absolute neutrino mass scale and the Majorana CP-violating ...
Recent data from the Wilkinson Microwave Anisotropy Probe (WMAP) place important bounds on the neutrino sector. The precise determination of the baryon number in the universe puts a strong constraint on the number of relativistic species during Big-Bang Nucleosynthesis. WMAP data, when combined with the 2dF Galaxy Redshift Survey (2dFGRS), also directly constrain the ...
This report discusses the motivation and the results of predictions of neutrino masses and coupling constants.
An introduction is given to the search for evidence of neutrino mass. 10 refs. (ERA citation 13:052585)
In this proceedings I review the physics that future experiments will use to determine the neutrino mass hierarchy.
In the context of three-flavor neutrino mixing, we present a thorough study of the phenomenological constraints applicable to three observables sensitive to absolute neutrino masses: The effective neutrino mass in Tritium beta-decay (m?); the effective Majorana ...
Experimental approaches to neutrino mass include kinematic mass measurements, neutrino oscillation searches at rectors and accelerators, solar neutrinos, atmospheric neutrinos, and single and double beta decay. The solar neutrino results yield fairly ...
Like the Southeastern Section of the APS, neutrinos are also septuagenarians, having been ``born'' in 1930 as a means of solving the apparent violation of energy and angular momentum in nuclear beta-decay. Because of their elusive nature, we have had a limited grasp of their intrinsic properties. However, in the past decade our understanding of neutrinos ...
We reconstruct the neutrino mass matrix in the flavor basis, using all available experimental data on neutrino oscillations. Majorana nature of neutrinos, normal mass hierarchy (ordering) and validity of the LMA MSW solution of the solar neutrino problem are assumed. We ...
In this talk I shall explain some basic concepts of baryogenesis and leptogenesis theory, and a new idea of experimental method of verification of fundamental ingredients of leptogenesis theory; the Majorana nature and the absolute magnitude of neutrino masses. Both of these are important to the quest of physics beyond the standard ...
2003 hep-ph/0302191 WUE-ITP-2003-002 SINP/TNP/03-06 Particle Physics Implications of the WMAP Neutrino cosmological bound on the absolute neutrino masses obtained from the Wilkinson Microwave Anisotropy Probe (WMAP oscillation interpre- tation of the LSND experiment. Combined with the KamLAND and Super-K data, the ...
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There is, presently, strong evidence from recent neutrino experiments that neutrinos undergo flavor oscillations, and hence must have finite masses. The oscillation results can provide differences between squares of neutrino mass eigenvalues, but cannot determine the ...
In the light of recent neutrino oscillation and nonoscillation data, we revisit the phenomenological constraints applicable to three observables sensitive to absolute neutrino masses: The effective neutrino mass in single beta decay (m{sub {beta}}); the effective Majorana ...
We study the discovery potential of future beta decay experiments on searches for the neutrino mass in the sub-eV range, and, in particular, KATRIN experiment with sensitivity /m>0.3 eV. Effects of neutrino mass and mixing on the beta decay spectrum in the neutrino schemes which explain the ...
A brief review of the status of three studies is given: the direct measurement of the neutrino mass, double beta decay, and various searches for neutrino oscillations. (WHK)
The authors show how one could determine the neutrino mass hierarchy with Moessbauer neutrinos and also revisit the questions of whether the hierarchy can be determined with reactor neutrinos.
The neutrinoless double-? (0???) decay process could provide crucial information to determine the absolute scale of neutrino masses, and it is the only one that can establish whether a neutrino is a Dirac or a Majorana particle. A key ingredient for extracting the absolute ...
The status of knowledge with respect to neutrinos is reviewed. Questions covered briefly include whether or not a neutrino is its own antiparticle and neutrino mass. Experimental studies are also considered, including neutrino oscillations, double beta decay, and direct ...
With the evidence for massive neutrinos from recent ?-oscillation experiments, one of the most fundamental tasks of particle physics over the next years will be the determination of the absolute mass scale of neutrinos, which has crucial implications for cosmology, astrophysics and particle physics. The KArlsruhe ...
By demanding a compact spectrum for the right-handed neutrinos and an approximate quark-lepton symmetry inspired from SO(10) gauge unification (assuming a Dirac neutrino mass matrix close to the up quark mass matrix), we construct a fine-tuning scenario for baryogenesis via leptogenesis. We find two solutions with ...
The observed flavor oscillations of solar and atmospheric neutrinos determine several elements of the leptonic mixing matrix, but leave open the small mixing angle ?13, a possible CP-violating phase, the mass ordering, the absolute mass scale m?,and the Dirac vs. Majorana property. Progress will be made by ...
It is amazing to acknowledge that in roughly 70 years from when the existence of the neutrino was postulated, we are now contemplating investigating the mysteries of this particle (or particles) requiring and utilizing detectors of 300 ktons , distances of 1,000-2,000 kilometers, beam intensities of megawatts and underground depth of 5,000 feet. This evolution has evolved ...
Contents: 1. Introduction. 2. Experimental indications of neutrino masses. 3. Patterns and textures for neutrinos. 4. Why neutrino mass necessarily means physics beyond the standard model. 5. Scenarios for small neutrino mass without right-handed ...
Neutrino oscillation experiments have shown that neutrinos have very small but non vanishing masses. These experiments however are not able to determine neither the absolute mass scale of neutrinos nor whether they are two-component Majorana particles, i.e. their own ...
Neutrino oscillation experiments have shown that neutrinos have very small but non vanishing masses. These experiments are not able to determine neither the absolute mass scale of neutrinos nor whether they are Majorana particles. Neutrino-less double ...
Theoretical concepts and motivations for considering neutrinos having finite masses are discussed and the experimental situation on searches for neutrino masses and oscillations is summarized. The solar neutrino problem, reactor, deep mine and accelerator...
It is shown that neutrino mixing, of the type required for neutrino oscillations, will complicate efforts to determine the electron neutrino mass from beta decay spectra. The shape of the spectra will depend on the masses and mixing angles of all neutrino...
The current status of the experimental search for neutrino mass is reviewed, with emphasis on direct kinematic methods, such as the beta decay of tritium. The situation concerning the electron neutrino mass as measured in tritium beta decay is essentially...
In this talk I review the present status of neutrino masses and mixing and some of their implications for particle physics phenomenology.
A time-energy correlation method has been developed to determine the signature of a nonzero neutrino
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The discovery by many different experiments of the flavour oscillation of neutrinos from different sources proved clearly that neutrinos have non-vanishing masses in contrast to their current description within the Standard Model of particle physics. However, the neutrino mass scale, which is - ...
We examine whether future, nearly all-sky galaxy redshift surveys, in combination with CMB priors, will be able to detect the signature of the cosmic neutrino background and determine the absolute neutrino mass scale. We also consider what constraints can be imposed on the effective number of ...
Current measurements of the large-scale structure (LSS) of galaxies are able to place an ~0.5eV upper limit on the absolute mass scale of neutrinos. An order-of-magnitude improvement in raw sensitivity, together with an insensitivity to systematic effects, is needed to reach the lowest value allowed by particle physics experiments. We ...
We study tachyonic preheating associated with the spontaneous breaking of B?L, the difference of baryon and lepton number. Reheating occurs through the decays of heavy Majorana neutrinos which are produced during preheating and in decays of the Higgs particles of B?L breaking. Baryogenesis is an interplay of nonthermal and thermal leptogenesis, accompanied by thermally ...
The GERmanium Detector Array, GERDA, is designed to search for 'neutrinoless double beta decay' (0?2?) in 76Ge. The high-purity segmented Ge detectors will be directly submerged and operated in liquid N2 or Ar. The measurement of the half-life time of 0?2? decay will provide information about the absolute neutrino mass scale and ...
The special properties of solar neutrinos that render this flux so uniquely important in searches for neutrino masses and flavor mixing are reviewed. The effects of matter, including density fluctuations and turbulence, on solar neutrino oscillations are ...
The lectures began by providing some background to neutrino mixing and masses. Flavour oscillations were then described, with the experimental attempts to detect them among: solar neutrinos; high energy atmospheric neutrinos; and in fission reactors, meso...
In the last years the mixing of the three neutrino flavor eigenstates through a unitary matrix has been experimentally proved. Presently one of the greatest challenges in neutrino physics is to establish the absolute value of the masses of the three neutrino mass ...
One of the more surprising discoveries of the past century is that neutrinos have non-zero mass, but measuring the absolute scale of the neutrino's mass has proven to be very challenging. The KArlsruhe TRItium Neutrino (KATRIN) experiment is dedicated to measuring or ...
The recent observations of ?-oscillation experiments show clearly that neutrinos are massive. One of the most fundamental tasks over the next years will be the determination of the absolute mass scale of neutrinos, which has crucial implications for cosmology, astrophysics and particle physics. The present ...
The natural sources of neutrinos and the energy of neutrinos derived from these sources are described. The present knowledge of the neutrino properties which most affect the astrophysics of neutrinos (such as the number of families and the neutrino mass, magnetic moment, ...
I review the basics of neutrino cosmology, from the question of neutrino decoupling and the presence of sterile neutrinos to the effects of neutrinos on the cosmic microwave background and large scale structure. Particular emphasis is put on cosmological neutrino mass ...
The current status of neutrino cosmology is reviewed, from the question of neutrino decoupling and the presence of sterile neutrinos to the effects of neutrinos on the cosmic microwave background and large scale structure. Particular emphasis is put on cosmological neutrino ...
Some theoretical aspects of a nonzero value for the neutrino rest mass and its possible implications for physics are discussed. The nature of the neutrino mass is analyzed, as well as the physical consequences that may derive from the existence of new helicity states for the neutrino or from ...
Neutrino oscillation was discovered through studies of neutrinos produced by cosmic-ray interactions in the atmosphere. These neutrinos are called atmospheric neutrinos. They are produced as decay products in hadronic showers resulting from collisions of cosmic rays with nuclei in the atmosphere. ...
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At present there is no positive experimental evidence that neutrinos have mass. Nevertheless, searches for neutrino mass continue, largely because the consequences of neutrinos having mass would be quite profound. In particular, the discovery of a non-zer...
Current knowledge of the neutrino mass, double ?-decay, and neutrino oscillations is reviewed and recent neutrino experiments are discussed in detail. The discovery and basic studies of ?e, ??, and ?? are briefly described in historical perspective. Projected experiments and techniques as well as prospects for the ...
It is not necessary that the electron neutrino and muon neutrino themselves have mass for oscillations to occur. For N neutrinos, if one is massive, oscillations occur with unique oscillation length determined by the mass of the heavy neutrino, mimicking ...
We report on a search for neutrino oscillations of the type nu/sub ..mu../ ..-->.. nu/sub e/ in a detector located an effective distance of 96m from the neutrino source in the wide band neutrino beam at the Brookhaven AGS. No excess of electron events was observed. The resulting upper limit on the strength of the mixing between ...
The KArlsruhe TRItium Neutrino experiment, (KATRIN), is designed to make a direct, model independent measurement of the electron neutrino mass with a sensitivity of .2 eV. A neutrino mass measurement will guide theory beyond the current Standard Model, which considers ...
Investigation of neutrinoless double-beta (2{beta}0{nu}) decay is presently being considered as one of the most important problems in particle physics and cosmology Interest in the problem was quickened by the observation of neutrino oscillations. The results of oscillation experiments determine the mass differences between different ...
The connection between the form of the neutrino mass matrix and the problem of family symmetry is discussed. 16 references.
Ultrahigh energy neutrinos (UHEnu) scatter on relic neutrinos (Rnu) producing Z bosons, which can decay hadronically producing protons (Z burst). We compare the predicted proton spectrum with the observed ultrahigh energy cosmic ray (UHECR) spectrum and determine the mass of the heaviest Rnu via a maximum likelihood analysis. Our ...
The theoretical arguments for neutrino mass are reviewed, and the present status of searches for neutrino mass in neutrino oscillations, direct measurements and other experiments are summarized. 46 references.
The addition of [ital m] singlet right-handed neutrinos to the standard model leads to radiatively generated mass corrections for the SU(2)[sub [ital L
The complete phenomenological treatment of the neutrino oscillation is given. The most general form of the mass matrix for N types of neutrino in the presence of both Dirac and Majorana mass terms is discussed and the form of operator corresponding to the...
The present status of neutrino masses, mixing, and electromagnetic moments is surveyed. Potential enhancements of neutrino oscillations, decay, and spin-flavor precession due to their interactions with matter are described.
In the Hugs 2002 student seminar sessions, I treat a number of topical issues in neutrino physics: the phenomenology of the MSW mechanism; a brief discussion of global analysis of atmospheric and solar neutrinos; Dirac and Majorana neutrino masses and the Seesaw mechanism as an explanation for the smallness of the ...
The Long Baseline Neutrino Experiment (LBNE) will address the neutrino mass hierarchy, leptonic CP violation, and the value of the mixing angle Theta13 with unprecedented sensitivity. Protons from the Fermilab Main Injector will impinge on a target to create intense fluxes of charged pions and other mesons. The mesons will be guided ...
Recent studies of neutrino oscillations have established the existence of finite neutrino masses and mixing between generations of neutrinos. The combined results from studies of atmospheric neutrinos, solar neutrinos, reactor antineutrinos and ...
Recent studies of neutrino oscillations have established the existence of finite neutrino masses and mixing between generations of neutrinos [1]. The combined results from studies of atmospheric neutrinos, solar neutrinos, reactor antineutrinos and ...
Neutrino mixing in a grand unified theory in which the neutrino mass matrix is determined by the Gell-Mann-Ramond-Slansky mechanism was investigated. With an arbitrary real right-handed Majorana mass matrix which incorporates three neutrino mass scales, t...
Some recent developments in the experimental search for neutrino mass are discussed. Simpson and Hime report finding new evidence for a 17-keV neutrino in the (beta) decay of (sup 3)H and (sup 35)S. New data from Los Alamos on the electron neutrino mass a...
The problem of the neutrino mass and L-conservation is discussed. A short review of some concrete models of neutrino mass generation is considered. Neutrino oscillations and neutrinoless double beta decay, 2 beta (o nu ), sensitive to neutrino masses ...
Laboratory experiments measuring neutrino oscillations indicate small mass differences between different mass eigenstates of neutrinos. The absolute mass scale is however not determined, with at present the strongest upper limits coming from astronomical observations rather ...
This note constitutes a Letter of Interest to study the physics capabilities of, and to develop an implementation plan for, a neutrino physics program based on a Low-Energy Neutrino Factory at Fermilab providing a {nu} beam to a detector at the Deep Underground Science and Engineering Laboratory. It has been over ten years since the discovery of ...
It is often said that neutrino mass is a window to a new physics beyond the standard model (SM). This is true if neutrinos are Majorana particles for the SM with Majorana neutrino mass is not a complete theory. The classical text-book test of neutrino Majorana ...
These lectures describe some aspects of the physics of massive neutrinos. After a brief introduction of neutrinos in the Standard Model, I discuss possible patterns for their masses. In particular, I show how the presence of a large Majorana mass term for the right-handed neutrinos can engender ...
The observation of neutrino oscillations (neutrino changing from one flavor to another) has provided compelling evidence that the neutrinos have non-zero masses and that leptons mix, which is not part of the original Standard Model of particle physics. Th...
The status of knowledge with respect to neutrinos is reviewed. Questions covered briefly include whether or not a neutrino is its own antiparticle, and neutrino mass. Experimental studies are also considered, including neutrino oscillations, double beta d...
The interplay between resonant solar neutrino oscillations and neutrino oscillations in laboratory experiments is investigated in a 3 generation model. Due to the assumed hierarchy of neutrino masses, together with our choice of a convenient parameterizat...
The status and the prospects of neutrino oscillation at nuclear reactors is reviewed. Neutrino oscillations are the best tool for probing neutrino mass and lepton number non-conservation. Five neutrino oscillation experiments have been carried out since 1...
We summarize what has been learned about the neutrino mass spectrum and neutrino mixing, identify interesting open questions that can be answered by accelerator neutrino facilities of the future, and discuss the importance and physics of answering them.
Test on masses of neutrinos below the 1 eV level are reviewed, and the limits of present experimental methods used to look for neutrino oscillations are discussed. A tagged neutrino experiment is suggested. The usual neutrino detector is supplemented by a...
A search for neutrino oscillations was made using the Fermilab narrow-band neutrino beam and the 15 ft. bubble chamber. No positive signal for neutrino oscillations was observed. Limits were obtained for mixing angles and neutrino mass differences for nu/...
We derive the standard formalism of Mikheyev, Smirnov, and Wolfenstein for the oscillation of neutrinos in matter taking into account the Lorentz and second-quantized structure of the neutrino fields. We consider neutrinos with Dirac or Majorana masses.
The search of the neutrinoless double-? decay address the major Physics goals of revealing the nature of the neutrino and setting an absolute scale for its mass. The observation of a positive ??0? signal, the unique signature of Majorana neutrinos, would have deep consequences in particle physics and cosmology. ...
SciBooNE is a neutrino and anti-neutrino cross-section experiment at Fermilab, USA. The SciBooNE experiment is summarised and two independent CCQE analyses are described. For one of the analyses, an absolute v{sub {mu}}-CCQE cross section in the neutrino energy region (0.6-1.6) GeV is shown and the technique ...
SciBooNE is a neutrino and anti-neutrino cross-section experiment at Fermilab, USA. The SciBooNE experiment is summarized and two independent CCQE analyses are described. For one of the analyses, an absolute {nu}{sub {mu}}-CCQE cross section in the neutrino energy region (0.6-1.6) GeV is shown and the technique ...
A high luminosity e+e{minus} collider is proposed to explore decays of charmed mesons, {tau} leptons, and charmonia. Extremely large event samples will give precision measurements of the absolute branching fraction and structure of hadronic, semileptonic, and leptonic charmed meson decay. Tau pair events will be used to study the properties of {tau} decay, and to measure the ...
This issue is devoted to the neutrino and its remaining mysteries. It is divided into the following areas: (1) The Reines-Cowan experiment -- detecting the poltergeist; (2) The oscillating neutrino -- an introduction to neutrino masses and mixing; (3) A brief history of neutrino experiments at ...
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Since the discovery of neutrino flavor oscillation in different fields and by many different experiments we believe that neutrinos have non-vanishing masses in contrast to their current description within the Standard Model of particle physics. However, the absolute values of the neutrino ...
Future cosmological data may be sensitive to the effects of a finite sum of neutrino masses even as small as {approx}0.06 eV, the lower limit guaranteed by neutrino oscillation experiments. We show that a cosmological detection of neutrino mass at that level would improve by many orders of ...
Neutrino induced transition rates from 205Tl to excited states in 205Pb were calculated for neutrino fluxes from the different hydrogen burning reactions in the Sun. Suppression factors for electron neutrinos due to flavor oscillations in the Sun were obtained. The influence of neutrino oscillations on the ...
Gary Feldman Neutrino Oscillations Neutrino Oscillations 1. Introduction 2. Status and Prospects A. Solar Neutrinos B. Atmospheric Neutrinos C. LSND Experiment D. High-Mass Neutrinos 3. Conclusions Plenary talk given at DPF'99 UCLA, January 9, 1999 #12;Gary Feldman ...
We review the current status of experimental knowledge about neutrinos derived from kinematic mass measurements, neutrino oscillation searches at reactors and accelerators, solar neutrinos, atmospheric neutrinos, and single and double beta decay. The solar neutrino results ...
Experimental evidence for neutrino oscillations is so far inconclusive. Experimental data for the neutrino mass yields <5 eV from double beta decay and m<20 eV for the electron antineutrino. A review of these experimental data is given. (AIP)
The discrete flavor symmetry A{sub 4} explains very well neutrino data at low energy, but it seems difficult to extend it to grand unified models since, in general, left-handed and right-handed fields belong to different A{sub 4} representations. Recently a model has been proposed where all the fermions equally transform under A{sub 4}. We study here a concrete SO(10) ...
We show that the simple Zee model of the neutrino mass already incorporates the interesting prediction of a large transitional neutrino magnetic moment.
In this paper, we study the phenomenology of right-handed neutrino isosinglets. We consider the general situation where the neutrino masses are not necessarily given by [ital m][sub [ital D
Data on neutrinos from SN 1987A are compared here with parameterized models of the neutrino emission
It has been pointed out by Bahcall and Bethe and others that all solar neutrino data can be explained by MSW oscillations with m([nu][sub [mu
Neutrino mass and mixing are amongst the major discoveries of recent years. From the observation of flavor change in solar and atmospheric neutrino experiments to the measurements of neutrino mixing with terrestrial neutrinos, recent experiments have provided consistent and compelling evidence ...
that the observed properties of the neutrino were consistent with z._so rest mass. ... For over 20 years the study of electron neutrino production ...
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The Daya Bay Neutrino Experiment Dawei Liu LBNL Abstract: Recent results showed that neutrinos undergo flavor oscillation and have finite masses. So far two of the three neutrino...
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The neutrinoless double-{beta} (0{nu}{beta}{beta}) decay process could provide crucial information to determine the absolute scale of neutrino masses, and it is the only one that can establish whether a neutrino is a Dirac or a Majorana particle. A key ingredient for extracting the absolute ...
Application of a time-energy correlation method to the Kamiokande II (KII) observations of neutrinos
Interference effects between light and heavy Majorana neutrinos in the amplitude for no-neutrino double beta decay are discussed. The effects include an upper bound on the heavy neutrino mass, and an A dependence for the effective mass extracted from double beta decay. Thus the search for the ...
In this talk, we discuss the possibility of determining the neutrino mass hierarchy by comparing the two effective atmospheric neutrino mass squared differences measured, respectively, in electron, and in muon neutrino disappearance oscillation experiment...
Neutrino masses and mixings are explored in superstring-inspired models within the framework of the extended seesaw mechanism. The neutrino mass matrix for the multigeneration case is diagonalized by using the seesaw calculation with the aid of the special structure of the mass matrix. We find ...
Super-Kmaiokande (SK) is a 50,000 ton cylindrical water Cherenkov detector located 1000m underground in Gifu prefecture in Japan. The experiment has started in 1996 aiming to study atmospheric, solar and supernova neutrinos and to search for proton decay in order to test grand unified theories. The purpose of the solar neutrino study in SK is to find a ...
Our present knowledge of neutrinos can be summarized in terms of the "standard neutrino scenario". Phenomenology of this scenario as well as attempts to uncover physics behind neutrino mass and mixing are described. Goals of future studies include complete reconstruction of the neutrino ...
Our present knowledge of neutrinos can be summarized in terms of the 'standard neutrino scenario'. Phenomenology of this scenario as well as attempts to uncover physics behind neutrino mass and mixing are described. Goals of future studies include complete reconstruction of the neutrino ...
Current ideas on neutrino oscillation plus confirmation from neutrino experiments make possible the changing of neutrino flavor due to interactions with the electrons in medium. When neutrinos pass through a medium and interact with the electrons, an effective potential energy is produced due to coherent forward ...
Massive relic neutrinos could be candidates for the dark matter in the universe. Cosmological data may be used to constrain the masses, lifetimes and number of flavors of neutrinos. The assets and liabilities of light (tens of eV) and heavy (?GeV) stable and unstable neutrinos are reviewed as are the limits on the ...
A brief review for particle physicists on the cosmological impact of neutrinos and on restrictions on neutrino properties from cosmology is given. The paper includes a discussion of upper bounds on neutrino mass and possible ways to relax them, methods to observe the cosmic-neutrino background, ...
I recall the place of neutrinos in the electroweak theory and summarize what we know about neutrino mass and flavor change. I next review the essential characteristics expected for relic neutrinos and survey what we can say about the neutrino contribution to the dark matter of the Universe. ...
We investigate weak nuclear decays with extremely small kinetic energy release (Q value) and thus extremely good sensitivity to the absolute neutrino mass scale. In particular, we consider decays into excited daughter states, and we show that partial ionization of the parent atom can help to tune Q values to <<1 keV. We ...
We investigate weak nuclear decays with extremely small kinetic energy release (Q value) and thus extremely good sensitivity to the absolute neutrino mass scale. In particular, we consider decays into excited daughter states, and we show that partial ionization of the parent atom can help to tune Q values to ?1 keV. We discuss several ...
We investigate weak nuclear decays with extremely small kinetic energy release (Q value) and thus extremely good sensitivity to the absolute neutrino mass scale. In particular, we consider decays into excited daughter states, and we show that partial ionization of the parent atom can help to tune Q values to << 1 keV. We ...
We write out the generic Dirac neutrino mass operator which possesses the Friedberg-Lee symmetry and find that its corresponding neutrino mass matrix is asymmetric. Following a simple way to break the Friedberg-Lee symmetry, we calculate the neutrino mass eigenvalues and ...
We study the helicity and chirality transitions of a high-energy neutrino propagating in a Schwarzschild space-time background. Using both traditional Schwarzschild and isotropic spherical coordinates, we derive an ultrarelativistic approximation of the Dirac Hamiltonian to first-order in the neutrino's rest mass, via a ...
The particle physics Standard Model has been tremendously successful in predicting the outcome of a large number of experiments. In this model Neutrinos are massless. Yet recent evidence points to the fact that neutrinos are massive particles with tiny masses compared to the other particles in the Standard Model. These tiny ...
We demonstrate that Majorana neutrinos can form Cooper pairs due to long-range attractive forces and show BCS superfluidity in a class of mass varying neutrino dark energy models. We describe the condensates for Majorana neutrinos and estimate the value of the gap, critical temperature, and Pippard coherence length ...
A search for heavy neutrinos was conducted in the neutrino beam produced by the 400 GeV proton beam-dump and in the 400 GeV wide-band neutrino beam at CERN. A heavy neutrino associated with the ? lepton was searched for in the beam-dump experiment. No assumption on the nature of heavy neutrinos ...
We consider the possibility to detect right-handed neutrinos, which are mostly singlets of the standard model gauge group, at future accelerators. Substantial mixing of these neutrinos with the active neutrinos requires a cancellation of different contributions to the light neutrino mass matrix ...
Possible mechanisms for the production of low-mass neutrinos and sterile neutrinos are considered. The quark mixing angles are calculated under the assumption that the traces of left-right symmetry are stable with respect to the masses of constituent quarks. Order-of-magnitude estimates of the ...
We give a general analysis of neutrino mixing in the seesaw mechanism with three flavors. Assuming that the Dirac and u-quark mass matrices are similar, we establish simple relations between the neutrino parameters and individual Majorana masses. They are shown to depend rather strongly on the physical ...
Super-Kamiokande is the world's largest water Cherenkov detector, with a net mass of 50,000 tons. The scientific goals of the experiment include searches for proton decays, and studies of neutrinos from various sources. In this paper we review some of the latest results from our neutrino oscillations studies using atmospheric ...
Neutrino oscillations are experimentally observable only as a result of interference between neutrino states with different masses and the same energy. All interference effects between neutrino states having different energies are destroyed by the interaction between the incident neutrino and ...
We propose an extension of the standard model, in which neutrinos are Dirac particles and their tiny masses originate from a one-loop radiative diagram. The new fields required by the neutrino mass generation also accommodate the explanation for the matter-antimatter asymmetry and dark matter in the Universe.
The 9th workshop on the mass of electron neutrinos was held at KEK, Japan. The experimental studies concerning the M-shell of Dy atoms for the measurement of the mass of electron neutrinos were presented at the workshop. The reports included in this proce...
We discuss gravitationally induced masses and mass splittings of Majorana, Zeldovich-Konopinski-Mahmoud and Dirac neutrinos. Among other implications, these effects can provide a solution of the solar neutrino puzzle. In particular, we show how this may w...
In this talk, I present a new mechanism for the generation of neutrino masses via dimension 7 operators: llHH(H*H)/M^3. This leads to new formula for the light neutrino masses, m_\
The existence of a finite neutrino mass would have important consequences in particle physics, astrophysics, and cosmology. Experimental sensitivities have continued to be pushed down without any confirmed evidence for a finite neutrino mass. Yet there ar...
Neutrino oscillations in different schemes of neutrino mixing requiring an even number of charged leptons are investigated. The theory with only either Dirac or Majorana mass terms is considered. It is shown that the Dirac and Majorana mass cases are dist...
This talk is a brief overview of some of the ideas behind our current understanding neutrino masses and mixings with special emphasis on what we can learn possibly about the scale of new physics responsible for neutrino masses from the Large Hadron Collider.
The strong current interest among physicists of the possibility of finite-mass neutrinos has resulted in several proposals at Los Alamos for experiments to detect nonzero neutrino masses. Three experiments now underway and three proposed experiments at LAMPF are discussed. 1 table.
It is by now established that neutrinos mix, have (different) nonzero masses, and therefore oscillate. The oscillation parameters themselves, however, are not all well-known. An open problem is that of the neutrino mass hierarchy. We study the possibility of determining the neutrino ...
Results from Super-K, SNO, and KamLAND provide strong evidence that neutrinos undergo flavor-changing oscillations and therefore have non-zero mass. The {nu}-disappearance observations by KamLAND, assuming CPT conservation, point to matter enhanced (MSW) oscillations with large mixing angles as the solution to the solar neutrino ...
An integrated neutrino spectrum is deduced from neutrino burst data of SN1987A. It is found that the spectrum can be fitted by an exponential function with kT around 4.2 MeV, corresponding to a primordial mass of the supernova >10 M/sub sun/. If neutrinos have nonzero rest mass, the time ...
We show that within the inverse seesaw mechanism for generating neutrino masses, minimal supergravity naturally provides the scalar neutrino as the lightest superparticle. We also demonstrate that such schemes naturally reconcile the small neutrino masses with the correct relic scalar ...
We derive upper limits on the sum of neutrino masses from an updated combination of data from Cosmic Microwave Background experiments and Galaxy Redshifts Surveys. The results are discussed in the context of three-flavor neutrino mixing and compared with neutrino oscillation data, with upper limits on the effective ...
Recent progress in experimental determinations of the properties of neutrinos is summarized. In particular, the extensive work on direct kinematic measurements of neutrino mass, on neutrino counting and on neutrino oscillations is highlighted. It is concluded that there may already be ...
We review the cancellation mechanism between light and heavy neutrinos in no-neutrino double beta decay, and the limits on the mass and mixing angle for the heavy neutrino. We emphasize that the effective mass for no-neutrino double beta decay varies with atomic weight, ...
We examine the possibility of embedding a 17-keV neutrino in a left-right model with three generations of left- and right-handed neutrinos. In particular, we study scenarios where the 17-keV neutrino is a pseudo Dirac neutrino and its mass is generated radiatively. Two heavy right-handed ...
The neutrinoless double beta decays of atomic nuclei are considered at the present the most viable way to access the fundamenntal nature and absolute mass scale of the neutrino. Recently one sub-class of these decays, the neutrinoless double electron capture (0?ECEC), has attracted a lot of attention due to its potential of detection. ...
The structure of the neutrino mass matrices is investigated, in a scheme where the minimal three-family Standard Model is extended by including right-handed neutrinos. No assumption is made about the presence of a large mass scale, like in the see-saw scheme. Certain peculiar features of the usual democratic ...
At present, cosmology provides the nominally strongest constraint on the masses of standard model neutrinos. However, this constraint is extremely dependent on the nature of the dark energy component of the Universe. When the dark energy equation of state parameter is taken as a free (but constant) parameter, the neutrino ...
We study a model for the mass matrices of the leptons. We are able to relate the mass eigenvalues of the charged leptons and of the neutrinos to the mixing angles and can predict the masses of the neutrinos. We find a normal hierarchy--the masses are 0.004 eV, 0.01 eV and ...
The recent(sup 71)Ga solar neutrino observation is combined with the (sup 37)Cl and Kamiokande-II observations in an analysis for neutrino masses and mixings. The allowed parameter region is found for matter enhanced mixings among all three neutrino flavo...
The special properties of solar neutrinos that render this flux so uniquely important in searches for neutrino masses and flavor mixing are reviewed. The effects of matter, including density fluctuations and turbulence, on solar neutrino oscillations are explained through analogies with more familiar atomic physics ...
We discuss the physics potential of the solar neutrino experiments: i) to explore the parameter space of neutrino mass and mixings; ii) to probe the physics of the Sun; and iii) to explore nuclear physics of the neutrino-target interactions. Examples are given for these three classes.
The field of neutrino physics has expanded greatly in recent years with the discovery that neutrinos change flavor and therefore have mass. Although there are many neutrino physics results since the last DIS workshop, these proceedings concentrate on rece...
Modifications to the standard big-bang neutrino cosmology resulting from a nonzero chemical potential are discussed. Cosmological neutrino mass limits as a function of ..mu../T are derived. Implications for galaxy formation in a universe with degenerate neutrinos are emphasized.
In these lectures we first summarize the general formalism of neutrino oscillations and treat the cases of two and three neutrino flavors in more detail. We then discuss some general experimental and numerical aspects and give a survey of the various type...
To explain the observed neutrino masses through the seesaw mechanism, a supersymmetric generalization of the Standard Model should include heavy right-handed neutrino supermultiplets. Then the neutrino Yukawa couplings can induce CP violation in the lepto...
Weak gravitational interactions with neutrinos are discussed. A general relativistic theory of neutrino fields is sought. The idealized neutrino which has zero rest mass, zero charge, and spin 1/2 is considered. There are two advantages to considering thi...
with sterile neutrinos ? Scott Dodelson Particle Astrohysics Center, FERMILAB, Batavia, IL 60510 observations, we con- strain the hypothesis of a fourth, sterile, massive neutrino. For the 3 massless + 1 massive neutrino case we bound the mass of the sterile neutrino to ms
