Neutrino Mass Models and Leptogenesis

Details Neutrino Mass Models and Leptogenesis Neutrino Mass Models and Leptogenesis

2004-11-26

arxiv.org/abs/hep-ph/0411345v1

Phys.Scripta T121 (2005) 178-184

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 3 figures, based on invited talks presented at the 10th International Symposium on Particles, Strings and Cosmology

Scientific paper

10.1088/0031-8949/2005/T121/028

In this talk we show how a natural neutrino mass hierarchy can follow from the type I see-saw mechanism, and a natural neutrino mass degeneracy from the type II see-saw mechanism, where the bi-large mixing angles can arise from either the neutrino or charged lepton sector. We summarize the phenomenological implications of such natural models, and discuss the model building applications of the approach, focussing on the $SU(3)\times SO(10)$ model. We also show that in such type II models the leptogenesis asymmetry parameter becomes proportional to the neutrino mass scale, in sharp contrast to the type I case, which leads to an upper bound on the neutrino mass scale, allowing lighter right-handed neutrinos and hence making leptogenesis more consistent with the gravitino constraints in supersymmetric models.

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