scholarly journals Vanishing effective mass of the neutrinoless double beta decay including light sterile neutrinos

2012 ◽  
Vol 706 (4-5) ◽  
pp. 406-411 ◽  
Author(s):  
Y.F. Li ◽  
Si-shuo Liu
Keyword(s):  
Effective Mass ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Sterile Neutrinos

scholarly journals Lepton Mixing Patterns from PSL2(7) with a Generalized CP Symmetry

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Shu-Jun Rong
Keyword(s):  
Effective Mass ◽  
Beta Decay ◽  
Charged Lepton ◽  
Modular Group ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Global Fit ◽  
Mixing Patterns ◽  
Cp Symmetry

Lepton mixing patterns from the modular group PSL2(7) with generalized CP symmetries are studied. The residual symmetries in both charged lepton and neutrino sectors are Z2×CP. Seven types of mixing patterns at the 3σ level of the new global fit data are obtained. Among these patterns, three types of patterns can give the Dirac CP phase which is in the 1σ range of the global fit data. The effective mass of neutrinoless double-beta decay for these patterns is also examined.

scholarly journals New results and perspectives in neutrino physics

2019 ◽  
Vol 212 ◽  
pp. 01005
Author(s):  
Yury Kudenko
Keyword(s):  
Neutrino Physics ◽  
Cp Violation ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Mass Measurement ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Sterile Neutrinos ◽  
Neutrino Mass Measurement

A brief review of new results and perspectives in neutrino physics is presented. An emphasis on a search for CP violation in neutrino oscillations and a search for sterile neutrinos is given. Status of measurement of the direct neutrino mass measurement and searches for neutrinoless double beta decay are also discussed.

scholarly journals Neutrino mixing with nonzero θ13 and CP violation in the 3-3-1 model based on A4 flavor symmetry

2015 ◽  
Vol 30 (21) ◽  
pp. 1550117 ◽  
Author(s):  
Vo Van Vien ◽  
Hoang Ngoc Long
Keyword(s):  
Cp Violation ◽  
Effective Mass ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Flavor Symmetry ◽  
Neutrino Mixing ◽  
Fermion Masses ◽  
New Formula

We propose a 3-3-1 model with neutral fermions based on [Formula: see text] flavor symmetry responsible for fermion masses and mixings with nonzero [Formula: see text]. To get realistic neutrino mixing, we just add a new [Formula: see text] triplet being in [Formula: see text] under [Formula: see text]. The neutrinos get small masses from two [Formula: see text] antisextets and one [Formula: see text] triplet. The model can fit the present data on neutrino masses and mixing as well as the effective mass governing neutrinoless double beta decay. Our results show that the neutrino masses are naturally small and a little deviation from the tri-bimaximal neutrino mixing form can be realized. The Dirac CP violation phase [Formula: see text] is predicted to either [Formula: see text] or [Formula: see text] with [Formula: see text].

NEW CONSTRAINTS ON Rp VIOLATING COUPLINGS VIA SUSY ACCOMPANIED NEUTRINO EXCHANGE MECHANISM OF NEUTRINOLESS DOUBLE BETA DECAY

1998 ◽  
Vol 13 (25) ◽  
pp. 2039-2044
Author(s):  
SIN KYU KANG
Keyword(s):  
Beta Decay ◽  
Half Life ◽  
Sterile Neutrino ◽  
Neutrinoless Double Beta Decay ◽  
Majorana Neutrino ◽  
Double Beta Decay ◽  
Exchange Mechanism ◽  
Sterile Neutrinos ◽  
Heavy Particles ◽  
The Individual

We consider ββ0ν decay induced by light Majorana neutrino exchange between decaying nucleons, accompanied by, in particular, the slepton exchange inside a nucleon. This contribution to ββ0ν is generated from the Rp violating terms and the mixing of the standard light neutrinos with neutral heavy particles or light sterile neutrinos. To determine the unknown mixing factor Δ, we take into account the four-neutrino model with three ordinary neutrinos and one sterile neutrino. Imposing the current experimental lower half-life limit, a set of constraints on [Formula: see text] and [Formula: see text] is obtained. Comparing with the limits on the products of the individual bounds on λ and λ′, we find that the former is stronger while the latter is weaker.

scholarly journals Getting Information on|Ue3|2from Neutrinoless Double Beta Decay

2007 ◽  
Vol 2007 ◽  
pp. 1-15 ◽  
Author(s):  
Alexander Merle ◽  
Werner Rodejohann
Keyword(s):  
Matrix Element ◽  
Effective Mass ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Experimental Limit ◽  
Upper Limit ◽  
Mixing Matrix

We consider the possibility to gain information on the lepton mixing matrix element|Ue3|from an improved experimental limit on the effective neutrino mass governing neutrinoless double beta decay. We show that typically a lower limit on|Ue3|as a function of the smallest neutrino mass can be set. Furthermore, we give the values of the sum of neutrino masses and|Ue3|which are allowed and forbidden by an experimental upper limit on the effective mass. Alternative explanations for neutrinoless double beta decay, Dirac neutrinos or unexplained cosmological features would be required if future measurements showed that the values lie in the respective regions. Moreover, we show that a measurement of|Ue3|from neutrinoless double beta decay is very difficult due to the expected errors on the effective mass and the oscillation parameters.

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