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arXiv · 0712.2610

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

Shu Luo·Zhi-zhong Xing
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Abstract

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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Shu Luo, Zhi-zhong Xing. 2007-12-17. The Minimal Type-II Seesaw Model and Flavor-dependent Leptogenesis. https://doi.org/10.1142/s0217751x08042225

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