Double Beta Decay and Majorana Neutrinos: Right-Handed Currents or Nonzero Masses?

1981 ◽  
pp. 333-347 ◽  
Author(s):  
S. P. Rosen
Keyword(s):  
Beta Decay ◽  
Double Beta Decay ◽  
Majorana Neutrinos

Double-beta-decay suppression with three generations of Majorana neutrinos

1985 ◽  
Vol 32 (5) ◽  
pp. 1241-1243
Author(s):  
Charles Picciotto ◽  
Julie Kopac
Keyword(s):  
Beta Decay ◽  
Double Beta Decay ◽  
Three Generations ◽  
Majorana Neutrinos

scholarly journals NEUTRINO MASSES, LEPTON FLAVOR MIXING AND LEPTOGENESIS IN THE MINIMAL SEESAW MODEL

2007 ◽  
Vol 16 (01) ◽  
pp. 1-50 ◽  
Author(s):  
WAN-LEI GUO ◽  
ZHI-ZHONG XING ◽  
SHUN ZHOU
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Majorana Neutrino ◽  
Double Beta Decay ◽  
Neutrino Mixing ◽  
Lepton Flavor ◽  
Seesaw Model ◽  
Flavor Mixing ◽  
Majorana Neutrinos

We present a review of neutrino phenomenology in the minimal seesaw model (MSM), an economical and intriguing extension of the Standard Model with only two heavy right-handed Majorana neutrinos. Given current neutrino oscillation data, the MSM can predict the neutrino mass spectrum and constrain the effective masses of the tritium beta decay and the neutrinoless double-beta decay. We outline five distinct schemes to parameterize the neutrino Yukawa-coupling matrix of the MSM. The lepton flavor mixing and baryogenesis via leptogenesis are investigated in some detail by taking account of possible texture zeros of the Dirac neutrino mass matrix. We derive an upper bound on the CP-violating asymmetry in the decay of the lighter right-handed Majorana neutrino. The effects of the renormalization-group evolution on the neutrino mixing parameters are analyzed, and the correlation between the CP-violating phenomena at low and high energies is highlighted. We show that the observed matter-antimatter asymmetry of the Universe can naturally be interpreted through the resonant leptogenesis mechanism at the TeV scale. The lepton-flavor-violating rare decays, such as μ→e+γ, are also discussed in the supersymmetric extension of the MSM.

scholarly journals Double beta decay, Majorana neutrinos, and neutrino mass

2008 ◽  
Vol 80 (2) ◽  
pp. 481-516 ◽  
Author(s):  
Frank T. Avignone ◽  
Steven R. Elliott ◽  
Jonathan Engel
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Double Beta Decay ◽  
Majorana Neutrinos

scholarly journals NEUTRINO-LESS DOUBLE BETA DECAY AND PARTICLE PHYSICS

2011 ◽  
Vol 20 (09) ◽  
pp. 1833-1930 ◽  
Author(s):  
WERNER RODEJOHANN
Keyword(s):  
Beta Decay ◽  
Particle Physics ◽  
Nuclear Physics ◽  
Double Beta Decay ◽  
Standard Interpretation ◽  
Sterile Neutrinos ◽  
Physics Potential ◽  
Majorana Neutrinos ◽  
Alternative Processes ◽  
Extensive List

We review the particle physics aspects of neutrino-less double beta decay. This process can be mediated by light massive Majorana neutrinos (standard interpretation) or by something else (non-standard interpretations). The physics potential of both interpretations is summarized and the consequences of future measurements or improved limits on the half-life of neutrino-less double beta decay are discussed. We try to cover all proposed alternative realizations of the decay, including light sterile neutrinos, supersymmetric or left-right symmetric theories, Majorons, and other exotic possibilities. Ways to distinguish the mechanisms from one another are discussed. Experimental and nuclear physics aspects are also briefly touched, alternative processes to double beta decay are discussed, and an extensive list of references is provided.

scholarly journals IMPLICATIONS OF OBSERVED NEUTRINOLESS DOUBLE BETA DECAY

2001 ◽  
Vol 16 (38) ◽  
pp. 2469-2482 ◽  
Author(s):  
H. V. KLAPDOR-KLEINGROTHAUS ◽  
U. SARKAR
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Confidence Level ◽  
Neutrinoless Double Beta Decay ◽  
Solar Neutrinos ◽  
Double Beta Decay ◽  
Atmospheric Neutrinos ◽  
Natural Choice ◽  
Mass Matrices ◽  
Majorana Neutrinos

Recently a positive indication of the neutrinoless double beta decay has been announced. We study the implications of this result taking into consideration earlier results on atmospheric neutrinos and solar neutrinos. We also include in our discussions the recent results from SNO and K2K. We point out that on the confidence level given for the double beta signal, the neutrino mass matrices are now highly constrained. All models predicting Dirac masses are ruled out and leptogenesis becomes a natural choice. Only the degenerate and the inverted hierarchical solutions are allowed for the three-generation Majorana neutrinos. In both cases we find that the radiative corrections destabilize the solutions and the LOW, VO and Just So solutions of the solar neutrinos are ruled out. For the four-generation case only the inverted hierarchical scenario is allowed.

A STRATEGY FOR DISCOVERING HEAVY NEUTRINOS

1996 ◽  
Vol 11 (09) ◽  
pp. 1607-1611
Author(s):  
CLEMENS A. HEUSCH ◽  
PETER MINKOWSKI
Keyword(s):  
Energy Range ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Particle Physics ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Mass Problem ◽  
Lepton Flavor ◽  
Majorana Neutrinos ◽  
Unique Capability

Same-sign lepton collisions in the TeV energy range may well have the unique capability to search for clear signals for the exchange of heavy Majorana neutrinos. Lepton-flavor-violating transitions e−e−→W−W− can thus contribute to the understanding of two unsolved riddles in particle physics: the neutrino mass problem and the question of the Dirac or Majorana character of heavy neutrinos. This search is not similarly accessible to such effects as neutrinoless double beta decay. The resulting experimental signatures are hard to miss.

scholarly journals CONSTRAINTS OF MIXING ANGLES FROM LEPTON NUMBER VIOLATING PROCESSES

1999 ◽  
Vol 14 (06) ◽  
pp. 433-445 ◽  
Author(s):  
HIROYUKI NISHIURA ◽  
KOUICHI MATSUDA ◽  
TAKESHI FUKUYAMA
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Mixing Angles ◽  
Left Handed ◽  
Majorana Neutrinos ◽  
Mixing Matrix ◽  
Lepton Number Violating

We discuss the constraints of lepton mixing angles from lepton number violating processes such as neutrinoless double beta decay, μ--e+ conversion and K decay, K-→π+μ-μ- which are allowed only if neutrinos are Majorana particles. The rates of these processes are proportional to the averaged neutrino mass defined by [Formula: see text] in the absence of right-handed weak coupling. Here a, b(j) are flavor(mass) eigenstates and Uaj is the left-handed lepton mixing matrix. We give general conditions imposed on <mν>ab in terms of mi, lepton mixing angles and CP violating phases (three phases in Majorana neutrinos). These conditions are reduced to the constraints among mi, lepton mixing angles and <mν>ab which are irrelevant to the concrete values of CP phases. Given a <mν>ab experimentally, these conditions constrain mi and the lepton mixing angles. Though these constraints are still loose except for neutrinoless double beta decay, they will become helpful through rapid improvements of experiments. By using these constraints we also derive the limits on averaged neutrino masses for μ--e+ conversion and K decay, K-→π+μ-μ-, respectively. We also present the bounds for CP phases in terms of mi, mixing angles and <mν>ab.

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