Electroweak Baryogenesis and Standard Model CP Violation

Details Electroweak Baryogenesis and Standard Model CP Violation Electroweak Baryogenesis and Standard Model CP Violation

1994-04-20

arxiv.org/abs/hep-ph/9404302v1

Phys.Rev.D51:379-394,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages, in LaTeX, one LaTeX figure included, 5 others available upon request, SLAC-PUB-6479

Scientific paper

10.1103/PhysRevD.51.379

We analyze the mechanism of electroweak baryogenesis proposed by Farrar and Shaposhnikov in which the phase of the CKM mixing matrix is the only source of $CP$ violation. This mechanism is based on a phase separation of baryons via the scattering of quasiparticles by the wall of an expanding bubble produced at the electroweak phase transition. In agreement with the recent work of Gavela, Hern\'andez, Orloff and P\`ene, we conclude that QCD damping effects reduce the asymmetry produced to a negligible amount. We interpret the damping as quantum decoherence. We compute the asymmetry analytically. Our analysis reflects the observation that only a thin, outer layer of the bubble contributes to the coherent scattering of the quasiparticles. The generality of our arguments rules out any mechanism of electroweak baryogenesis that does not make use of a new source of $CP$ violation.

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