Leptogenesis from Supersymmetry Breaking

Abstract

We show that soft supersymmetry breaking terms involving the heavy sneutrinos can lead to sneutrino-antisneutrino mixing and to new sources of CP violation, which are present even if a single generation is considered. These terms are naturally present in supersymmetric versions of leptogenesis scenarios, and they induce indirect CP violation in the decays of the heavy sneutrinos, eventually generating a baryon asymmetry. This new contribution can be comparable to or even dominate over the asymmetry produced in traditional leptogenesis scenarios.

4 pages; An improved discussion of the relevant numerical range of the soft breaking terms (in agreement with hep-ph/0308031)

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• Neutrino Masses and Mixing: Evidence and Implications
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