Supersymmetric Electroweak Baryogenesis

TL;DR

This paper introduces a new method to calculate baryon asymmetry in supersymmetric models during the electroweak phase transition, highlighting the importance of higher-order effects and changes in $ an eta$.

Contribution

It develops a novel Higgs insertion expansion method to compute CP-violating asymmetry, revealing that higher-order effects can significantly enhance baryon asymmetry.

Findings

CP asymmetry proportional to change in $ an eta$ at leading order

Higher-order effects remove suppression, potentially increasing asymmetry

Small $ riangle eta$ can lead to larger baryon asymmetry

Abstract

We calculate the baryon asymmetry generated at the electroweak phase transition in the minimal supersymmetric standard model, using a new method to compute the CP-violating asymmetry in the Higgsino flux reflected into the unbroken phase. The method is based on a Higgs insertion expansion. We find that the CP asymmetry at leading order is proportional to the change in $\tan \beta$ in the bubble wall, which is at most of order $10^{-2}$, while at next-to-leading order this suppression factor disappears. This result may enhance the final baryon asymmetry generated during the electroweak phase transition for small $\Delta \beta (< 10^{-3}$).