Neutrino Mixing and Leptogenesis in Type II Seesaw Mechanism

Details Neutrino Mixing and Leptogenesis in Type II Seesaw Mechanism Neutrino Mixing and Leptogenesis in Type II Seesaw Mechanism

2004-06-24

arxiv.org/abs/hep-ph/0406268v2

Phys.Rev.D70:053009,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex 14 pages, 1 table. More discussions and references added. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.70.053009

In the framework of type II seesaw mechanism we propose two simple but instructive ansatze for neutrino mixing and leptogenesis. In each ansatz, the effective Majorana neutrino mass matrix is composed of two parts -- the part with Z_2 symmetry arises from the ordinary type I seesaw mechanism and the part with S_3 symmetry arises from an additional Higgs triplet vacuum expectation value. The two ansatze can simultaneously account for the current neutrino oscillation data and the cosmological baryon number asymmetry via leptogenesis.

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