scholarly journals Charged lepton flavour violcxmation and neutrinoless double beta decay in left-right symmetric models with type I+II seesaw

2016 ◽  
Vol 2016 (7) ◽  
Author(s):  
Debasish Borah ◽  
Arnab Dasgupta
Keyword(s):  
Beta Decay ◽  
Charged Lepton ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Type I ◽  
Lepton Flavour

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.

Cobimaximal neutrino mixing in the U(1)B−L extension with A4 symmetry

2020 ◽  
Vol 35 (38) ◽  
pp. 2050311
Author(s):  
V. V. Vien
Keyword(s):  
Beta Decay ◽  
Atmospheric Neutrino ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Tree Level ◽  
Physical Parameters ◽  
Neutrino Masses ◽  
Type I ◽  
Neutrino Mixing ◽  
Best Fit

We propose a renormalizable [Formula: see text] extension of the Standard model with [Formula: see text] symmetry that leads to the successful cobimaximal lepton mixing ansatz, thus providing a predictive explanation for leptonic mixing observables. The smallness of the active neutrino masses and neutrino masses ordering are produced by the type-I seesaw mechanism at the tree-level. The obtained physical parameters are well consistent with the global fit of neutrino oscillation.1 The model is predictive in the sense that it reproduces the experimental values of neutrino parameters in which the reactor neutrino mixing angle [Formula: see text] get the best-fit value and the solar and atmospheric neutrino mixing angles have little deviations from the best-fit values given in Ref. 1, however, they are consistent with the other experimental results.[Formula: see text] The effective neutrino masses governing the neutrinoless double beta decay is predicted to be [Formula: see text] for normal hierarchy and [Formula: see text] for inverted hierarchy which are well consistent with the recent experimental limits on neutrinoless double beta decay.

scholarly journals Twin modular S4 with SU(5) GUT

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Stephen F. King ◽  
Ye-Ling Zhou
Keyword(s):  
Beta Decay ◽  
Charged Lepton ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Triangular Form ◽  
Charged Fermion ◽  
Neutrino Sector ◽  
Proposed Model ◽  
The Right

Abstract We discuss the SU(5) grand unified extension of flavour models with multiple modular symmetries. The proposed model involves two modular S4 groups, one acting in the charged fermion sector, associated with a modulus field value τT with residual $$ {Z}_3^T $$ Z 3 T symmetry, and one acting in the right-handed neutrino sector, associated with another modulus field value τSU with residual $$ {Z}_2^{SU} $$ Z 2 SU symmetry. Quark and lepton mass hierarchies are naturally generated with the help of weightons, which are SM singlet fields, where their non-zero modular weights play the role of Froggatt-Nielsen charges. The model predicts TM1 lepton mixing, and neutrinoless double beta decay at rates close to the sensitivity of current and future experiments, for both normal and inverted orderings, with suppressed corrections from charged lepton mixing due to the triangular form of its Yukawa matrix.

scholarly journals Hiding neutrinoless double beta decay in the minimal seesaw mechanism

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
Takehiko Asaka ◽  
Hiroyuki Ishida ◽  
Kazuki Tanaka
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Seesaw Mechanism
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