Abstract
We calculate the baryon asymmetry generated at the electroweak phase transition in the minimal supersymmetric standard model, using a new approach to compute the CP-violating asymmetry in the Higgsino flux reflected into the unbroken phase. The approach is based on a Higgs insertion expansion. We find that the CP asymmetry at leading order is proportional to the change in Δβ in the bubble wall, which is at most of order 10 −2, while at next-to-leading order this suppression factor disappears. These results explain part of the previous discrepancies among different calculations and may enhance the final baryon asymmetry generated during the electroweak phase transition.
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