Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-10-02
J.Phys.Conf.Ser.120:022007,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages, 2 figures, contribution to the proceedings of the TAUP 07 conference, Sep. 11-15, Sendai, Japan
Scientific paper
10.1088/1742-6596/120/2/022007
I present here a concise summary of the preprint arXiv:0707.3024, written in collaboration with A. Anisimov and P. Di Bari. There we discuss leptogenesis when {\em CP} violation stems exlusively from the Dirac phase in the PMNS mixing matrix. Under this assumption it turns out that the situation is very constrained when a hierarchical heavy right-handed (RH) neutrino spectrum is considered: the allowed regions are small and the final asymmetry depends on the initial conditions. On the other hand, for a quasi-degenerate spectrum of RH neutrinos, the {\em CP} asymmetry can be enhanced and the situation becomes much more favorable, with no dependence on the initial conditions. Interestingly, in the extreme case of resonant leptogenesis, in order to match the observed baryon asymmetry of the Universe, we obtain a lower bound on \sin \q_{13} which depends on the lightest active neutrino mass m_1.
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