Cosmological Baryon Asymmetry in Supersymmetric Standard Models and Heavy Particle Effects

Abstract

Cosmological baryon asymmetry B is studied in supersymmetric standard models, assuming the electroweak reprocessing of B and L. Only when the soft supersymmetry breaking is taken into account, B is proportional to the primordial B-L in the supersymmetric standard models. The ratio $B/(B-L)$ is found to be about one percent less than the nonsupersymmetric case. Even if the primordial B-L vanishes, scalar-leptons can be more efficient than leptons to generate B provided that mixing angles $\mathrm{th}$ among scalar leptons satisfy $|\mathrm{th}|<10^{-8}(T/GeV{)}^{1/2}$.

Comments: 11 pages in LaTex, 3 PostScript figures included