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Low Scale Leptogenesis from Non-Leptonic CP-Phases

We point out new sources of CP -violation for leptogenesis at electroweak temperatures. In supersymmetric models, CP -violation leading to a lepton asymmetry can originate from the phase of the μ-term relative to soft gaugino masses or soft triscalar interactions. As an additional possibility, we consider a top-quark loop in a multiple Higgs doublet model. Leptogenesis from these non-leptonic CP -phases is also a viable mechanism for baryogenesis when the mass of the right-handed neutrinos is below the electroweak scale.