Leptogenesis from Soft Supersymmetry Breaking (Soft Leptogenesis)

Details Leptogenesis from Soft Supersymmetry Breaking (Soft Leptogenesis) Leptogenesis from Soft Supersymmetry Breaking (Soft Leptogenesis)

2011-07-26

arxiv.org/abs/1107.5312v2

IJMPA, Vol. 26, No. 21 (2011) 3491-3604

Physics

High Energy Physics

High Energy Physics - Phenomenology

References updated. Some minor corrections to match the published version

Scientific paper

10.1142/S0217751X1105405X

Soft leptogenesis is a scenario in which the cosmic baryon asymmetry is produced from a lepton asymmetry generated in the decays of heavy sneutrinos (the partners of the singlet neutrinos of the seesaw) and where the relevant sources of CP violation are the complex phases of soft supersymmetry-breaking terms. We explain the motivations for soft leptogenesis, and review its basic ingredients: the different CP-violating contributions, the crucial role played by thermal corrections, and the enhancement of the efficiency from lepton flavour effects. We also discuss the high temperature regime $T > 10^7$ GeV in which the cosmic baryon asymmetry originates from an initial asymmetry of an anomalous $R$-charge, and soft leptogenesis reembodies in $R$-genesis.

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