Abstract
We have studied the two-body production and decay of a heavy, right-handed neutrino totwo light states using the full Boltzmann equation instead of the usual integratedBoltzmann equation which assumes kinetic equilibrium of all species. Decays and inversedecays are inefficient for thermalizing the distribution function of the heavy neutrinoand in some parameter ranges there can be very large deviations from kineticequilibrium. This leads to substantial numerical differences between the two approaches.Furthermore we study the impact of this difference on the lepton asymmetryproduction during leptogenesis and find that in the strong washout regime the finalasymmetry is changed by 15–30% when the full Boltzmann equation is used.
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