Towards the minimal seesaw model via CP violation of neutrinos

被引：21

作者：

Shimizu, Yusuke ^{[1
]}

Takagi, Kenta ^{[1
]}

Tanimoto, Morimitsu ^{[2
]}

机构：

[1] Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526, Japan

[2] Niigata Univ, Dept Phys, Niigata 9502181, Japan

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2017年 / 11期

关键词：

Neutrino Physics; CP violation; Discrete Symmetries; SOLAR NEUTRINOS; MIXING MATRIX; MASS; SYMMETRY; PHASES; PREDICTIONS; A(4);

D O I：

10.1007/JHEP11(2017)201

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study the minimal seesaw model, where two right-handed Majorana neutrinos are introduced, focusing on the CP violating phase. In addition, we take the trimaximal mixing pattern for the neutrino flavor where the charged lepton mass matrix is diagonal. Thanks to this symmetric framework, the 3x2 Dirac neutrino mass matrix is given in terms of a few parameters. Numerical studies reveal that the observation of the CP violating phase can determine the flavor structure of the Dirac neutrino mass matrix in the minimal seesaw model. In particular, new minimal Dirac neutrino mass matrices are proposed in the case of TM1, which is derived by the additional 2-3 family mixing to the tri-bimaximal mixing basis in the normal hierarchy of neutrino masses. Our analyses include the Littlest seesaw model by King et al. as one of the specific cases. Furthermore, it is remarked that our 3x2 Dirac neutrino mass matrix is reproduced by introducing gauge singlet flavons with the specific alignments of the VEV's. These alignments suggest the residual symmetry of S-4 group.

引用

页数：28

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