arXiv:1012.1597·v2·High Energy Physics — Phenomenology
Early Universe effective theories: The Soft Leptogenesis and R-Genesis Cases
Chee Sheng Fong · (YITP, Stony Brook) · M.C. Gonzalez-Garcia · (ICREA, Barcelona & Barcelona U., ECM & ICC, Barcelona U. & YITP, Stony Brook) · Enrico Nardi · (Frascati & Madrid, Autonoma U. & Madrid, IFT)
Abstract
We discuss the effective theory appropriate for studying soft leptogenesis at temperatures T>10^7 GeV. In this regime, the main source of the B-L asymmetry is the CP asymmetry of a new anomalous R-charge that couple to generalized anomalous electroweak processes. Baryogenesis thus occurs mainly through R-genesis, and with an efficiency that can be up to two orders of magnitude larger than in usual estimates. Contrary to common belief, a sizeable baryon asymmetry is generated also when thermal corrections to the CP asymmetries in sneutrino decays are neglected which, in soft leptogenesis, implyes vanishing lepton-flavour CP asymmetries. We present general Boltzmann equations for soft leptogenesis that are valid in all temperature regimes.
Comments: 41 pages, 5 figures, added 4 references