Supersymmetric Electroweak Baryogenesis

Details Supersymmetric Electroweak Baryogenesis Supersymmetric Electroweak Baryogenesis

1999-07-22

arxiv.org/abs/hep-ph/9907460v3

Nucl.Phys. B570 (2000) 155-173

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, LaTeX, 3 ps figures, minor changes added, one reference added

Scientific paper

10.1016/S0550-3213(99)00797-X

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 $\Delta \beta (< 10^{-3}$).

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