scholarly journals Experiments on lepton and baryon stability and oscillation phenomena

1982 ◽  
Vol 304 (1482) ◽  
pp. 105-134 ◽  
Keyword(s):  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Nuclear Reactors ◽  
Solar And Atmospheric Neutrinos ◽  
High Energy ◽  
Lepton Number ◽  
Atmospheric Neutrinos ◽  
Nucleon Decay ◽  
Number Conservation ◽  
Experimental Approaches

The various experiments on lepton number conservation and on nucleon stability currently being done or prepared are reviewed, and their relative merits compared and discussed. The first part of the paper is devoted to the measurement of the neutrino mass and to the present limits on the conservation of the total lepton number and of the various lepton flavours. The existing results and future projects on the strictly connected problems of neutrino oscillations at nuclear reactors, pion factories and high energy accelerators will be also discussed, together with oscillations of solar and atmospheric neutrinos. The second part of the paper concerns the few results and the m any planned detectors on nucleon decay with particular emphasis on the problems of background radioactivity and of the variety of experimental approaches. Oscillation experiments on neutron—antineutron oscillations at nuclear reactors are also considered.

NEUTRINO MASS: PEEPING BEYOND THE STANDARD MODEL

2000 ◽  
Vol 14 (19n20) ◽  
pp. 2051-2061
Author(s):  
AMITAVA RAYCHAUDHURI
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Particle Physics ◽  
Neutrino Oscillations ◽  
Solar And Atmospheric Neutrinos ◽  
Beyond The Standard Model ◽  
Atmospheric Neutrinos ◽  
The Standard Model

Evidence in support of a nonzero neutrino mass, through the phenomenon of oscillations, is steadily becoming more compelling. A pedagogic introduction to vacuum neutrino oscillations and resonant flavour conversion is presented in this paper, prefaced by a thumbnail sketch of the relevant properties of the neutrino as embodied in the Standard Model of particle physics. The recent results from solar and atmospheric neutrinos are summarised and their combined implications on neutrino properties are outlined. Some attempts to incorporate a nonzero neutrino mass in extensions of the Standard Model are briefly discussed.

Neutrino Masses and Mixing

2003 ◽  
Vol 214 ◽  
pp. 347-356
Author(s):  
Yoji Totsuka
Keyword(s):  
Neutrino Oscillations ◽  
Solar And Atmospheric Neutrinos ◽  
Convincing Evidence ◽  
Neutrino Masses ◽  
Atmospheric Neutrinos ◽  
Mixing Angle ◽  
Mixing Angles ◽  
The One ◽  
Quark Flavors

Recent results on neutrino masses and mixing are presented. There is convincing evidence for nonzero but tiny masses of at least two flavor neutrinos, based on two types of neutrino oscillations, solar and atmospheric neutrinos. The large mixing angle between first and second flavors and also the one between the second and third flavors were found, quite contrary to small mixing angles among quark flavors, and pose a new mystery.

Experimental results on atmospheric neutrinos

1994 ◽  
Vol 346 (1678) ◽  
pp. 63-73 ◽  
Keyword(s):  
Cosmic Rays ◽  
Neutrino Mass ◽  
High Energy ◽  
Experimental Results ◽  
Atmospheric Neutrinos ◽  
Earth’S Atmosphere ◽  
High Energy Cosmic Rays ◽  
Fundamental Properties ◽  
Production Site ◽  
The Status

Atmospheric neutrinos arise from the decay of mesons produced by the interactions of high energy cosmic rays with nuclei in the Earth's atmosphere. Studies of the interactions of these neutrinos are sensitive to the fundamental properties of neutrinos such as neutrino mass and neutrino flavour mixing. Because the energies of these neutrinos range from less than 1 GeV to more than 10 TeV, and because the distances from the production site to the detector range from 10 to 10000 km, the range of neutrino mass differences sampled is large and extends to lower values than is presently accessible to accelerator experiments. This paper summarizes the status of experimental results on atmospheric neutrinos and the possible interpretations of these results.

scholarly journals FINALLY NEUTRINO HAS MASS

2000 ◽  
Vol 15 (05) ◽  
pp. 625-650 ◽  
Author(s):  
S. M. BILENKY ◽  
C. GIUNTI ◽  
C. W. KIM
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Solar Neutrino ◽  
Present Status ◽  
Neutrino Oscillations ◽  
Neutrino Masses ◽  
Atmospheric Neutrinos ◽  
Neutrino Experiments

The present status of the problem of neutrino mass, mixing and neutrino oscillations is briefly summarized. The evidence for oscillations of atmospheric neutrinos found recently in the Super-Kamiokande experiment is discussed. Indications in favor of neutrino oscillations obtained in solar neutrino experiments and in the accelerator LSND experiment are also considered. Implications of existing neutrino oscillation data for neutrino masses and mixing are discussed.

FROM NUCLEAR PHYSICS TO PHYSICS BEYOND THE STANDARD MODEL: FIRST EVIDENCE FOR LEPTON NUMBER VIOLATION AND THE MAJORANA CHARACTER OF NEUTRINOS

2004 ◽  
Vol 13 (10) ◽  
pp. 2107-2126 ◽  
Author(s):  
H. V. KLAPDOR-KLEINGROTHAUS
Keyword(s):  
Beyond Standard Model ◽  
Standard Model ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Half Life ◽  
Nuclear Physics ◽  
High Energy ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Boson Mass

Nuclear double beta decay provides an extraordinarily broad potential to search for beyond-standard-model physics. The occurrence of the neutrinoless decay(0νββ) mode has fundamental consequences: first, the total lepton number is not conserved, and second, the neutrino is a Majorana particle. Furthermore, the measured effective mass provides an absolute scale of the neutrino mass spectrum. In addition, double beta experiments yield sharp restrictions for other beyond-standard-model physics. These include SUSY models (R-parity breaking and conserving), leptoquarks (leptoquark-Higgs coupling), compositeness, left-right symmetric models (right-handed W boson mass), test of special relativity and of the equivalence principle in the neutrino sector and others. First evidence for neutrinoless double beta decay was reported by the HEIDELBERG–MOSCOW experiment in 2001. The HEIDELBERG–MOSCOW experiment is by far the most sensitive0νββ experiment since more than 10 years. It is operating 11 kg of enriched 76Ge in the GRAN SASSO Underground Laboratory. The analysis of the data taken from 2 August 1990–20 May 2003 is presented here. The collected statistics is 71.7 kg y. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/kg y keV. The two-neutrino accompanied half-life is determined on the basis of more than 100,000 events to be [Formula: see text] years. The confidence level for the neutrinoless signal has been improved to a 4.2σ level. The half-life is [Formula: see text] years. The effective neutrino mass deduced is (0.2–0.6) eV (99.73% C.L.), with the consequence that neutrinos have degenerate masses. The sharp boundaries for other beyond SM physics, mentioned above, are comfortably competitive to the corresponding results from high-energy accelerators like TEVATRON, HERA, etc.

scholarly journals Measurement of Atmospheric Neutrino Oscillations with Very Large Volume Neutrino Telescopes

2015 ◽  
Vol 2015 ◽  
pp. 1-24 ◽  
Author(s):  
J. P. Yáñez ◽  
A. Kouchner
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Large Volume ◽  
Neutrino Oscillations ◽  
Atmospheric Neutrino ◽  
Atmospheric Neutrinos ◽  
Neutrino Telescopes ◽  
The Way

Neutrino oscillations have been probed during the last few decades using multiple neutrino sources and experimental set-ups. In the recent years, very large volume neutrino telescopes have started contributing to the field. First ANTARES and then IceCube have relied on large and sparsely instrumented volumes to observe atmospheric neutrinos for combinations of baselines and energies inaccessible to other experiments. Using this advantage, the latest result from IceCube starts approaching the precision of other established technologies and is paving the way for future detectors, such as ORCA and PINGU. These new projects seek to provide better measurements of neutrino oscillation parameters and eventually determine the neutrino mass ordering. The results from running experiments and the potential from proposed projects are discussed in this review, emphasizing the experimental challenges involved in the measurements.

Sign in / Sign up

Export Citation Format

Share Document