The Minimal Type-II Seesaw Model and Flavor-dependent Leptogenesis

Details The Minimal Type-II Seesaw Model and Flavor-dependent Leptogenesis The Minimal Type-II Seesaw Model and Flavor-dependent Leptogenesis

2007-12-17

arxiv.org/abs/0712.2610v1

Int.J.Mod.Phys.A23:3412-3415,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages. Talk given by Shu Luo at the 4th International Conference on Flavor Physics, 24-28 September 2007, Beijing (to appear

Scientific paper

10.1142/S0217751X08042225

Current experimental data allow the zero value for one neutrino mass, either m_1 =0 or m_3 =0. This observation implies that a realistic neutrino mass texture can be established by starting from the limit (a) m_1 = m_2 =0 and m_3 \neq 0 or (b) m_1 = m_2 \neq 0 and m_3 =0. In both cases, we may introduce a particular perturbation which ensures the resultant neutrino mixing matrix to be the tri-bimaximal mixing pattern or its viable variations. We find that it is natural to incorporate this kind of neutrino mass matrix in the minimal Type-II seesaw model with only one heavy right-handed Majorana neutrino N. We show that it is possible to account for the cosmological baryon number asymmetry in the m_3 =0 case via thermal leptogenesis, in which the CP-violating asymmetry of N decays is attributed to the electron flavor.

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