Tuesday, February 21, 2012

1112.5819 (Takeshi Araki et al.)

A Q_6 flavor symmetry model for the nuMSM    [PDF]

Takeshi Araki, Y. F. Li
The extension of the Minimal Standard Model by three right-handed sterile
neutrinos with masses smaller than the electroweak scale (nuMSM) is discussed
in a Q_6 flavor symmetry framework. The lightness of the keV sterile neutrino
and the near mass degeneracy of two heavier sterile neutrinos are naturally
explained by exploiting group properties of Q_6. A normal hierarchical mass
spectrum and an approximately mu-tau symmetric mass matrix are predicted for
three active neutrinos. Non-zero theta_{13} can be obtained together with a
deviation of theta_{23} from the maximality, where both mixing angles are
consistent with the latest global data including T2K and MINOS results.
Furthermore, the tiny active-sterile mixing is related to the mass ratio
between the lightest active and lightest sterile neutrinos.
View original: http://arxiv.org/abs/1112.5819

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