On Gaugino Contributions to Soft Leptogenesis

Details On Gaugino Contributions to Soft Leptogenesis On Gaugino Contributions to Soft Leptogenesis

2008-12-30

arxiv.org/abs/0901.0008v1

JHEP 0903:073,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 4 figures

Scientific paper

10.1088/1126-6708/2009/03/073

We study the contributions to CP violation in right-handed sneutrino decays induced by soft supersymmetry-breaking gaugino masses including flavour effects and paying special attention to the role of thermal corrections. Using a field-theoretical as well as a quantum mechanical approach we compute the CP asymmetries and we conclude that for all the soft-supersymmetry breaking sources of CP violation considered, an exact cancellation between the asymmetries produced in the fermionic and bosonic channels occurs at T=0 up to second order in soft supersymmetry-breaking parameters. Once thermal effects are included the new sources of CP violation induced by supersymmetry-breaking gaugino masses can be sizeable and they can produce the observed baryon asymmetry for conventional values of the B parameter.

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