Eur. Phys. J. C (2008) 56: 379-387
https://doi.org/10.1140/epjc/s10052-008-0661-z

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

^* e-mail: suematsu@hep.s.kanazawa-u.ac.jp

Received: 10 March 2008
Revised: 22 May 2008
Published online: 17 July 2008

Abstract

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.