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Standard Model CP-violation and Baryon Asymmetry. Part 2: Finite temperature

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Standard Model CP-violation and Baryon Asymmetry. Part 2: Finite temperature

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Gavela, María Belén; Hernández Gamazo, Pilar; Orloff, Jean; Pène, Olivier; Quimbay Herrera, Carlos

This document is a artículoDate1994

Este documento está disponible también en : http://hdl.handle.net/10550/43330

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 α2W 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 MW and the temperature. The effect is many orders of magnitude below what observation requires.

Gavela, María Belén Hernández Gamazo, Pilar Orloff, Jean Pène, Olivier Quimbay Herrera, Carlos 1994 Standard Model CP-violation and Baryon Asymmetry. Part 2: Finite temperature Nuclear Physics B 430 382 426

http://dx.doi.org/10.1016/0550-3213(94)00410-2