Supersymmetric electroweak baryogenesis

We re-examine the generation of the baryon asymmetry in the minimalsupersymmetric standard model (MSSM) during the electroweak phase transition.We find that the dominant source for baryogenesis arises from the charginosector. The CP-violation comes from the complex phase in the mu parameter,which provides CP-odd contributions to the particle dispersion relations. Thisleads to different accelerations for particles and antiparticles in the wallregion which, combined with diffusion, leads to the separation of Higgsinos andtheir antiparticles in the front of the wall. These asymmetries get transportedto produce perturbations in the left-handed chiral quarks, which then drivesphaleron interactions to create the baryon asymmetry. We present a completederivation of the semiclassical WKB formalism, including the charginodispersion relations and a self-consistent derivation of the diffusionequations starting from semiclassical Boltzmann equations for WKB-excitations.We stress the advantages of treating the transport equations in terms of themanifestly gauge invariant physical energy and kinetic momentum, rather than inthe gauge variant canonical variables used in previous treatments. We show thata large enough baryon asymmetry can be created for the phase of the complex muparameter as small as ~ 0.001, which is consistent with bounds from the neutronelectric dipole moment.Comment: 54 pages, 3 figure