scholarly journals Neutrinoless Double Beta Decay: 2015 Review

2016 ◽  
Vol 2016 ◽  
pp. 1-37 ◽  
Author(s):  
Stefano Dell’Oro ◽  
Simone Marcocci ◽  
Matteo Viel ◽  
Francesco Vissani
Keyword(s):  
Beta Decay ◽  
Particle Physics ◽  
State Of The Art ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Point Of View ◽  
Neutrino Masses ◽  
Theoretical Point ◽  
Theoretical Understanding ◽  
The Status

The discovery of neutrino masses through the observation of oscillations boosted the importance of neutrinoless double beta decay (0νββ). In this paper, we review the main features of this process, underlining its key role from both the experimental and theoretical point of view. In particular, we contextualize the0νββin the panorama of lepton number violating processes, also assessing some possible particle physics mechanisms mediating the process. Since the0νββexistence is correlated with neutrino masses, we also review the state of the art of the theoretical understanding of neutrino masses. In the final part, the status of current0νββexperiments is presented and the prospects for the future hunt for0νββare discussed. Also, experimental data coming from cosmological surveys are considered and their impact on0νββexpectations is examined.

scholarly journals Neutrinoless Double-Beta Decay

2012 ◽  
Vol 2012 ◽  
pp. 1-38 ◽  
Author(s):  
Andrea Giuliani ◽  
Alfredo Poves
Keyword(s):  
Beta Decay ◽  
Particle Physics ◽  
Nuclear Physics ◽  
Experimental Situation ◽  
Neutrinoless Double Beta Decay ◽  
Majorana Neutrino ◽  
Double Beta Decay ◽  
Point Of View ◽  
The Status ◽  
Majorana Neutrino Mass

This paper introduces the neutrinoless double-beta decay (the rarest nuclear weak process) and describes the status of the research for this transition, both from the point of view of theoretical nuclear physics and in terms of the present and future experimental scenarios. Implications of this phenomenon on crucial aspects of particle physics are briefly discussed. The calculations of the nuclear matrix elements in case of mass mechanisms are reviewed, and a range for these quantities is proposed for the most appealing candidates. After introducing general experimental concepts—such as the choice of the best candidates, the different proposed technological approaches, and the sensitivity—we make the point on the experimental situation. Searches running or in preparation are described, providing an organic presentation which picks up similarities and differences. A critical comparison of the adopted technologies and of their physics reach (in terms of sensitivity to the effective Majorana neutrino mass) is performed. As a conclusion, we try to envisage what we expect round the corner and at a longer time scale.

scholarly journals Nuclear and Detector Sensitivities for Neutrinoless Double Beta-Decay Experiments

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Hiroyasu Ejiri
Keyword(s):  
Beta Decay ◽  
Particle Physics ◽  
Weak Interactions ◽  
High Sensitivity ◽  
Neutrinoless Double Beta Decay ◽  
Majorana Neutrino ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Ultrahigh Sensitivity ◽  
Electroweak Model

Neutrinoless double beta-decay (DBD) is of current interest in high-sensitivity frontiers of particle physics. The decay is very sensitive to Majorana neutrino masses, neutrino CP phases, right-handed weak interactions, and others, which are beyond the standard electroweak model. DBDs are actually ultrarare events, and thus, DBD experiments with ultrahigh sensitivity are required. Critical discussions are presented on nuclear and detector sensitivities for high-sensitivity DBD experiments to study the neutrino masses in the normal and inverted mass hierarchies.

THE STATUS OF TWO-NEUTRINO AND NEUTRINOLESS DOUBLE BETA DECAY SEARCHES

1993 ◽  
Vol 02 (03) ◽  
pp. 507-546 ◽  
Author(s):  
M.K. MOE
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Experimental Activity ◽  
The Past ◽  
The Status ◽  
Substantial Progress ◽  
Direct Counting ◽  
Made In

Substantial progress has been made in double beta decay experiments in the past few years, including the beginning of sensitive new searches for neutrinoless double beta decay, and several additional positive detections of the two-neutrino mode by geochemical, radiochemical, and direct-counting techniques. This review discusses the recent experimental activity.

scholarly journals Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses

2012 ◽  
Vol 2012 (6) ◽  
Author(s):  
Francisco del Aguila ◽  
Alberto Aparici ◽  
Subhaditya Bhattacharya ◽  
Arcadi Santamaria ◽  
Jose Wudka
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Lagrangian Approach ◽  
Neutrino Masses ◽  
Effective Lagrangian

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.

NEUTRINOLESS DOUBLE BETA DECAY

2012 ◽  
Vol 12 ◽  
pp. 80-89
Author(s):  
OLIVIERO CREMONESI
Keyword(s):  
Beta Decay ◽  
Present Status ◽  
Neutrinoless Double Beta Decay ◽  
Mass Scale ◽  
Present Knowledge ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Mixing Parameters ◽  
Absolute Mass ◽  
Practical Tool

Neutrinoless double beta decay (ββ(0ν)) is presently the only practical tool for probing the character of neutrinos. In case neutrinos are Majorana particles ββ(0ν) can provide also fundamental informations on their absolute mass scale. The present status of experiments searching for ββ(0ν) is reviewed and the most relevant results discussed. A possibility to observe ββ(0ν) at a neutrino mass scale in the range 10-50 meV looks possible according to our present knowledge of the neutrino masses and mixing parameters. A review of the future projects and of the most relevant parameters contributing to the experimental sensitivity iss finally outlined.

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.

scholarly journals A realistic model of neutrino masses with a large neutrinoless double beta decay rate

2012 ◽  
Vol 2012 (5) ◽  
Author(s):  
Francisco del Aguila ◽  
Alberto Aparici ◽  
Subhaditya Bhattacharya ◽  
Arcadi Santamaria ◽  
Jose Wudka
Keyword(s):  
Decay Rate ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Realistic Model ◽  
Double Beta Decay ◽  
Neutrino Masses
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