Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-06-11
Nucl.Phys.B430:382-426,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
44 pages, CERN-TH.7263/94, LPTHE Orsay-94/49, HUTP-94/A015, HD-THEP-94-20, FTUAM-94/14, NSF-ITP-94-65
Scientific paper
10.1016/0550-3213(94)00410-2
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.
Gavela Belén M.
Hernandez Pedro
Orloff Jean
Pene Olivier
Quimbay Carlos
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