In weak-washout heavy-particle decay leptogenesis, the lepton asymmetry is approximately independent of the decaying particle mass and the couplings of thermalized decay products, because the nonthermal distribution scales inversely with both.
Leptogenesis from Additional Higgs Doublets
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Leptogenesis may be induced by the mixing of extra Higgs doublets with experimentally accessible masses. This mechanism relies on diagrammatic cuts that are kinematically forbidden in the vacuum but contribute at finite temperature. A resonant enhancement of the asymmetry occurs generically provided the dimensionless Yukawa and self-interactions are suppressed compared to those of the Standard Model Higgs field. This is in contrast to typical scenarios of Resonant Leptogenesis, where the asymmetry is enhanced by imposing a degeneracy of singlet neutrino masses.
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The mass-coupling effect in leptogenesis
In weak-washout heavy-particle decay leptogenesis, the lepton asymmetry is approximately independent of the decaying particle mass and the couplings of thermalized decay products, because the nonthermal distribution scales inversely with both.