STANDARD MODEL CP-VIOLATION AND BARYON ASYMMETRY .2. FINITE-TEMPERATURE

We consider the scattering of quasi-particles off the boundary created during a first order electroweak phase transition. Spatial coherence is lost due to the quasi-quark damping rate, and we show that reflection on the boundary is suppressed, even at tree-level. Simply on CP considerations, we argue against electroweak baryogenesis in the Standard Model via the charge transport mechanism. A CP-asymmetry is produced in the reflection properties of quarks and antiquarks hitting the phase boundary. An effect is present at order alpha(w)(2) in rate and a regular GIM behaviour is found, which can be expressed in terms of two unitarity triangles. A crucial role is played by the damping rate of quasi-particles in a hot plasma, which is a relevant scale together with M(w) and the temperature. The effect is many orders of magnitude below what observation requires.