Maximal CP-violation in neutrino mass matrix in light of the latest Daya Bay result on θ13

被引：11

作者：

Verma, Surender ^{[1
]}

机构：

[1] Govt Degree Coll, Dept Phys, Arki 173208, India

来源：

PHYSICS LETTERS B | 2012年 / 714卷 / 01期

关键词：

DOUBLE-BETA DECAY; FUTURE GENERATION; EXTRAPOLATION;

D O I：

10.1016/j.physletb.2012.06.076

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Daya Bay Collaboration (preprint) ill has recently proclaimed discovery of non-zero reactor angle, theta(13), sin(2) 2 theta(13) = 0.092 +/- 0.016(stat) +/- 0.005(syst), at 5.2 sigma which is in conformity with the earlier observations of T2K Collaboration (2011) [2], MINOS Collaboration (2011) [3] and DOUBLE CHOOZ Collaboration (2011) [4] last year. The discovery has immense implication for exploring CP-violation in the leptonic sector. In the present work, we examine CP-violation in Majorana neutrino mass matrix, in the basis where charged lepton mass matrix is diagonal, in which the ratio of elements are equal, also, termed as Strong Scaling Ansatz (SSA). This Ansatz has been known to explain the vanishing of theta(13) and predict inverted hierarchy (IH) for the neutrino masses. However, to generate a non-zero value of theta(13) consistent with Daya Bay result one has to deviate from SSA. This deviation will have important implications for CP-violation in the leptonic sector and is one of the issues addressed in the present work. CP is maximally violated because, for central value of theta(13) obtained from Daya Bay experiment, Dirac-type phase vertical bar delta vertical bar approximate to pi/2, 3 pi/2 which corresponds to vertical bar J(CP)vertical bar approximate to 0.03. We have, also, studied imperative implications for Majorana-type phases alpha, beta and effective neutrino mass, M-ee. The Majorana-type phases alpha, beta are found to be sharply constrained. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：92 / 96

页数：5

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