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.
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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.