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arxiv: hep-ph/9708393 · v2 · submitted 1997-08-18 · ✦ hep-ph · astro-ph

Supersymmetric Electroweak Baryogenesis in the WKB approximation

classification ✦ hep-ph astro-ph
keywords baryonapproximationasymmetrydeltaelectroweakequationsphasesupersymmetric
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We calculate the baryon asymmetry generated at the electroweak phase transition in the minimal supersymmetric standard model, treating the particles in a WKB approximation in the bubble wall background. A set of diffusion equations for the particle species relevant to baryon generation, including source terms arising from the CP violation associated with the complex phase $\delta$ of the $\mu$ parameter, are derived from Boltzmann equations, and solved. The conclusion is that $\delta$ must be $\gsim 0.1$ to generate a baryon asymmetry consistent with nucleosynthesis. We compare our results to several other recent computations of the effect, arguing that some are overestimates.

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