The Minimal Type-II Seesaw Model and Flavor-dependent Leptogenesis
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.
Cite
@article{arxiv.0712.2610,
title = {The Minimal Type-II Seesaw Model and Flavor-dependent Leptogenesis},
author = {Shu Luo and Zhi-zhong Xing},
journal= {arXiv preprint arXiv:0712.2610},
year = {2008}
}
Comments
4 pages. Talk given by Shu Luo at the 4th International Conference on Flavor Physics, 24-28 September 2007, Beijing (to appear in the proceedings)