Leptogenesis and dark matter unified in a non-SUSY model for neutrino masses

Details Leptogenesis and dark matter unified in a non-SUSY model for neutrino masses Leptogenesis and dark matter unified in a non-SUSY model for neutrino masses

2007-06-16

arxiv.org/abs/0706.2401v3

Eur.Phys.J.C56:379-387,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 3 figures, extended version for publication, references added

Scientific paper

10.1140/epjc/s10052-008-0661-z

We propose a unified explanation for the origin of dark matter and baryon number asymmetry on the basis of a non-supersymmetric model for neutrino masses. Neutrino masses are generated in two distinct ways, that is, a tree-level seesaw mechanism with a single right-handed neutrino, and one-loop radiative effects by a new additional doublet scalar. A spontaneously broken U(1)$^\prime$ brings a $Z_2$ symmetry which restricts couplings of this new scalar and controls the neutrino masses. It also guarantees the stability of a CDM candidate. We examine two possible candidate for the CDM. We also show that the decay of a heavy right-handed neutrino related to the seesaw mechanism can generate baryon number asymmetry through leptogenesis.

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