Ameliorating the popular lepton mixings with A4 symmetry: A seesaw model for realistic neutrino

被引：5

作者：

Pramanick, Soumita ^{[1
,2
]}

机构：

[1] Harish Chandra Res Inst, Chhatnag Rd, Allahabad 211019, Uttar Pradesh, India

[2] Univ Calcutta, Dept Phys, 92 Acharya Prafulla Chandra Rd, Kolkata 700009, India

来源：

PHYSICAL REVIEW D | 2018年 / 98卷 / 07期

关键词：

A(4); MASSES;

D O I：

10.1103/PhysRevD.98.075016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A model for neutrino masses and mixing is presented using the seesaw mechanism. The model combines type-I and type-II seesaw contributions of which the latter dominates. The scalars and the leptons in the model are assigned A4 charges suitable to obtain the mass matrices required for the scheme. The type-II seesaw accommodates atmospheric mass splitting and maximal mixing in the atmospheric sector (theta(23) = pi/4). It is characterized by vanishing solar mass splitting and. 13 whereas the third neutrino mixing angle can acquire any value, theta(0)(12). Particular alternatives of theta(0)(12) viz. theta(0)(12) = 35.3 degrees (tribimaximal), 45.0 degrees (bimaximal), 31.7 degrees (golden ratio) are accounted for. Another choice of theta(0)(12)=0 degrees (no solar mixing) is also considered. Incorporating the corrections provided by the subdominant type-I seesaw involves degenerate perturbation theory due to vanishing solar splitting in the type-II seesaw enabling the solar mixing angle to receive substantial corrections. Apart from amending the solar sector, the type-I seesaw also tunes all the neutrino oscillation parameters into the allowed ranges, thus interrelating them all. Thus, the model is testable in the light of future experimental data. As an example,. 23 emerges in the first (second) octant for normal (inverted) ordering. CP-violation is controlled by phases present in the right-handed Majorana neutrino mass matrix, M nu R. Only normal ordering is allowed if these phases are absent. If M nu R is complex the Dirac CP-violating phase delta, can be large, i.e., similar to +/- pi/2, and inverted ordering is also allowed. T2K and NOVA preliminary data favoring normal ordering and delta similar to -pi/2 predicts lightest neutrino mass to be 0.05 eV or more within the model framework.

引用

页数：22

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