Abstract
We consider the scattering of quasi-particles of 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 α W 2 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.
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