Q_6 flavor symmetry model for the extension of the minimal standard model by three right-handed sterile neutrinos

Details Q_6 flavor symmetry model for the extension of the minimal standard model by three right-handed sterile neutrinos Q_6 flavor symmetry model for the extension of the minimal standard model by three right-handed sterile neutrinos

2011-12-26

arxiv.org/abs/1112.5819v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 1 figure, Title changed for publication, final version to appear in Phys. Rev. D 85, 065016 (2012)

Scientific paper

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. Nonzero 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.

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