Abstract
We take the first steps towards the complete computation of the thermalization rate of the supersymmetric particles involved in electroweak baryogenesis by computing the thermalization rate of the right-handed stop from the imainary part of the two-point Green function. We use improved propagators including resummation of hard thermal loops. The thermalization rate is computed at the one-loop level in the high temperature approximation as a function of M t ̃ R (T) . We also give an estimate for the magnitude of the two-loop contributions which dominate the rate for small M t ̃ R (T) . If the stop is non-relativistic with M t ̃ R (T)≫T , thermalization takes place by decay and is very fast.
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