Neutrino Masses and Mixings in a Minimal SO(10) Model

Details Neutrino Masses and Mixings in a Minimal SO(10) Model Neutrino Masses and Mixings in a Minimal SO(10) Model

2005-05-23

arxiv.org/abs/hep-ph/0505200v2

Phys.Rev. D72 (2005) 115003

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 13 eps figures, revtex4; references added, some minor corrections

Scientific paper

10.1103/PhysRevD.72.115003

We consider a minimal formulation of SO(10) Grand Unified Theory wherein all the fermion masses arise from Yukawa couplings involving one 126 and one 10 of Higgs multiplets. It has recently been recognized that such theories can explain, via the type-II seesaw mechanism, the large \nu_\mu - \nu_\tau mixing as a consequence of b-tau unification at the GUT scale. In this picture, however, the CKM phase \delta lies preferentially in the second quadrant, in contradiction with experimental measurements. We revisit this minimal model and show that the conventional type-I seesaw mechanism generates phenomenologically viable neutrino masses and mixings, while being consistent with CKM CP violation. We also present improved fits in the type-II seesaw scenario and suggest fully consistent fits in a mixed scenario.

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