WIMPy Leptogenesis With Absorptive Final State Interactions

Abstract

We consider a class of leptogenesis models in which the lepton asymmetry arises from dark matter annihilation processes which violate CP and lepton number. Importantly, a necessary one-loop contribution to the annihilation matrix element arises from absorptive final state interactions. We elucidate the relationship between this one-loop contribution and the CP-violating phase. As we show, the branching fraction for dark matter annihilation to leptons may be small in these models, while still generating the necessary asymmetry.

17 pages, 3 figures, version to appear in PRD

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• A Bitter Pill: The Primordial Lithium Problem Worsens
• Matrix element analyses of dark matter scattering and annihilation
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