Leptogenesis in the two right-handed neutrino model revisited

Details Leptogenesis in the two right-handed neutrino model revisited Leptogenesis in the two right-handed neutrino model revisited

2011-07-29

arxiv.org/abs/1107.6002v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

41 pages, 10 figures

Scientific paper

We revisit leptogenesis in the minimal non-supersymmetric type I see-saw mechanism with two right-handed (RH) neutrinos, including flavour effects and allowing both RH neutrinos N_1 and N_2 to contribute, rather than just the lightest RH neutrino N_1 that has hitherto been considered. By performing scans over parameter space in terms of the single complex angle z of the orthogonal matrix R, for a range of PMNS parameters, we find that in regions around z \sim \pm \pi/2, for the case of a normal mass hierarchy, the N_2 contribution can dominate the contribution to leptogenesis, allowing the lightest RH neutrino mass to be decreased by about an order of magnitude in these regions, down to M_1 \sim 7*10^10 GeV for initial thermal N_2-abundance, with the numerical results supported by analytic estimates. We show that the regions around z \sim \pm \pi /2 correspond to light sequential dominance, so the new results in this paper may be relevant to unified model building.

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