TeV scale resonant leptogenesis from supersymmetry breaking

We propose a model of TeV-scale resonant leptogenesis based upon recentmodels of the generation of light neutrino masses from supersymmetry-breakingeffects with TeV-scale right-handed (rhd) neutrinos, $N_i$. The model leads tonaturally large cosmological lepton asymmetries via the resonant behaviour ofthe one-loop self-energy contribution to $N_i$ decay. Our model addresses theprimary problems of previous phenomenological studies of low-energyleptogenesis: a rational for TeV-scale rhd neutrinos with small Yukawacouplings so that the out-of equilibrium condition for $N_i$ decay issatisfied; the origin of the tiny, but non-zero mass splitting required betweenat least two $N_i$ masses; and the necessary non-trivial breaking of flavoursymmetries in the rhd neutrino sector. The low mass-scale of the rhd neutrinosand their superpartners, and the TeV-scale $A$-terms automatically containedwithin the model offer opportunities for partial direct experimental tests ofthis leptogenesis mechanism at future colliders.Comment: 10 Pages latex, version for JHE