S_3 Flavor Symmetry and Leptogenesis

Details S_3 Flavor Symmetry and Leptogenesis S_3 Flavor Symmetry and Leptogenesis

2005-02-18

arxiv.org/abs/hep-ph/0502164v1

Eur.Phys.J.C45:465-475,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 3 figures

Scientific paper

10.1140/epjc/s2005-02434-3

We consider leptogenesis in a minimal S_3 extension of the standard model with an additional Z_2 symmetry in the leptonic sector. It is found that the CP phase appearing in the neutrino mixing is the same as that for the CP asymmetries responsible for leptogenesis. Because of the discrete S_3 x Z_2 flavor symmetries, the CP asymmetries are strongly suppressed. We therefore assume that the resonant enhancement of the CP asymmetries takes place to obtain a realistic size of baryon number asymmetry in theuniverse. Three degenerate right-handed neutrino masses of O(10) TeV are theoretically expected in this model.

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