Regular Article - Theoretical Physics
Leptogenesis and dark matter unified in a non-SUSY model for neutrino masses
Institute for Theoretical Physics, Kanazawa University, Kanazawa, 920-1192, Japan
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Revised: 22 May 2008
Published online: 17 July 2008
We propose a unified explanation for the origin of dark matter and baryon number asymmetry on the basis of a non-supersymmetric model for the 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)′ brings about a Z2 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 candidates 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.
© Springer-Verlag , 2008