Electroweak Baryogenesis from Chargino Transport in the Supersymmetric Model

We study the baryon asymmetry of the universe in the supersymmetric standardmodel (SSM). At the electroweak phase transition, the fermionic partners of thecharged SU(2) gauge bosons and Higgs bosons are reflected from or transmittedto the bubble wallof the broken phase. Owing to a physical complex phase intheir mass matrix, these reflections and transmissions have asymmetries betweenCP conjugate processes. Equilibrium conditions in the symmetric phaseare thenshifted to favor a non-vanishing value for the baryon number density, which isrealized through electroweak anomaly. We show that the resultant ratio ofbaryon number to entropy is consistent with its present observed value withinreasonable ranges of SSM parameters, provided that the CP-violating phaseintrinsic in the SSM is not much suppressed. The compatibility with theconstraints on the parameters from the electric dipole moment of the neutron isalso discussed.Comment: 23 page