scholarly journals Neutrino mass matrix with U(2) flavor symmetry and neutrino oscillations

1998 ◽  
Vol 57 (3) ◽  
pp. 1983-1986 ◽  
Author(s):  
Morimitsu Tanimoto
Keyword(s):  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Mass Matrix ◽  
Neutrino Mass Matrix ◽  
Flavor Symmetry

scholarly journals PREDICTIONS OF AN A4 MODEL WITH A FIVE-PARAMETER NEUTRINO MASS MATRIX

2007 ◽  
Vol 22 (03) ◽  
pp. 181-189 ◽  
Author(s):  
L. LAVOURA ◽  
H. KÜHBÖCK
Keyword(s):  
Neutrino Mass ◽  
Numerical Study ◽  
Mass Matrix ◽  
Neutrino Mass Matrix ◽  
Flavor Symmetry ◽  
Scatter Plots

We consider a model with an A4 flavor symmetry, recently proposed by Ma,1 and make a numerical study, through scatter plots, of its neutrino mass matrix.

scholarly journals Two Higgs singlets \(A_4\) Flavor Symmetry with Minimal Breaking

2014 ◽  
Vol 24 (2) ◽  
pp. 113 ◽  
Author(s):  
Nguyen Thanh Phong
Keyword(s):  
Neutrino Mass ◽  
Mass Matrix ◽  
Baryon Asymmetry ◽  
Neutrino Mass Matrix ◽  
Flavor Symmetry ◽  
Mixing Angle ◽  
Mixing Angles ◽  
The Universe

We study the seesaw realization of a \(A_4\)model with two Higgs singlets. In this model, the mixing angle \(\theta_{13}\) and leptogenesis are zero if the components of right handed neutrino mass matrix resulting from the two Higgs singlets are exact degenerate. We then study the minimal breaking of the model by a tiny shift between aforementioned components. This minimal breaking results in deviations of lepton mixing angles from their tri-bimaximal mixing values in which the current experimental value of \(\theta_{13}\) can be achieved. Besides, the baryon asymmetry of the Universe is successfully generated through non-zero leptogenesis by the decay of right handed neutrinos.

scholarly journals ASPECTS OF NEUTRINO MASS MATRICES

2005 ◽  
Vol 20 (06) ◽  
pp. 1188-1196
Author(s):  
P. H. FRAMPTON
Keyword(s):  
Cp Violation ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Mass Matrix ◽  
Neutrino Mass Matrix ◽  
Long Baseline ◽  
Mass Matrices

After an Introduction briefly describing the rise and fall of the three-zero texture of the Zee model, we discuss still-allowed two-zero textures for the Majorana three-neutrino mass matrix. Finally, a model with two right-handed neutrinos and two Dirac texture zeros is described (FGY model) which can relate CP violation in leptogenesis to CP violation in long-baseline neutrino oscillations.

scholarly journals Neutrino mass matrix in a gauge group SU(2)L × U(1)e × U(1)μ × U(1)τ

2019 ◽  
Vol 34 (12) ◽  
pp. 1950066
Author(s):  
Fayyazuddin
Keyword(s):  
Gauge Group ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Mass Matrix ◽  
Atmospheric Neutrino ◽  
Neutrino Mass Matrix ◽  
Yukawa Couplings ◽  
The Standard Model ◽  
The Right ◽  
Higgs Scalar

The electroweak unification group [Formula: see text] in which each fermion multiplet has its own [Formula: see text] factor was proposed in 1986 to get the neutrino mass matrix. In this paper, the gauge group [Formula: see text] is restricted to lepton section only, leaving quark multiplets as in the Standard Model. In addition to lepton multiplets [Formula: see text], [Formula: see text] and [Formula: see text], there are three [Formula: see text] singlet right-handed neutrinos [Formula: see text]’s. With the breaking of [Formula: see text] to [Formula: see text], the right-handed neutrinos acquire heavy Majorana masses. Three heavy right-handed neutrinos [Formula: see text]’s are available to generate a [Formula: see text] nondiagonal neutrino mass matrix in terms of three Yukawa couplings [Formula: see text], [Formula: see text], [Formula: see text] of the Higgs scalar doublet to [Formula: see text], [Formula: see text], [Formula: see text] with [Formula: see text], [Formula: see text] and [Formula: see text], respectively. Three Yukawa couplings can be arranged and expressed in terms of masses [Formula: see text], [Formula: see text], [Formula: see text] in three different ways to obtain the results of interest for Case 1: [Formula: see text]; Case 2: [Formula: see text]; Case 3: [Formula: see text]. The results obtained for the three cases are compared with the experimental data from neutrino oscillations. Cases 1 and 2 are relevant for solar neutrino oscillations whereas Case 3 is relevant for atmospheric neutrino oscillations.

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