On Gaugino Contributions to Soft Leptogenesis
Abstract
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.
Cite
@article{arxiv.0901.0008,
title = {On Gaugino Contributions to Soft Leptogenesis},
author = {Chee Sheng Fong and M. C. Gonzalez-Garcia},
journal= {arXiv preprint arXiv:0901.0008},
year = {2009}
}
Comments
20 pages, 4 figures