Thursday, December 27, 2012

1212.5913 (Yusuke Shimizu et al.)

Minimal Neutrino Texture with Neutrino Mass Ratio and Cabibbo Angle    [PDF]

Yusuke Shimizu, Ryo Takahashi, Morimitsu Tanimoto
We present neutrino mass matrix textures in a minimal framework of the type-I seesaw mechanism where two right-handed Majorana neutrinos are introduced in order to reproduce experimental results of neutrino oscillations. The textures can lead to experimentally favored leptonic mixing angles described by the tri-bimaximal mixing with one additional rotation. We present minimal and next to minimal textures for the normal mass hierarchy case in a context of the texture zero. A minimal texture in the inverted hierarchy case is also constructed, which does not have any vanishing entries in a Dirac neutrino mass matrix. We also discuss some cases that model parameters in the textures are supposed to be a neutrino mass ratio and/or the Cabibbo angle. Predicted regions of mixing angles, a leptonic CP-violation parameter, and an effective mass for the neutrino-less double beta decay are presented in all textures.
View original: http://arxiv.org/abs/1212.5913

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