Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-27
Phys.Rev.D81:063506,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 5 figures
Scientific paper
10.1103/PhysRevD.81.063506
We investigate the impact of the tau and bottom Yukawa couplings on the transport dynamics for electroweak baryogenesis in supersymmetric extensions of the Standard Model. Although it has generally been assumed in the literature that all Yukawa interactions except those involving the top quark are negligible, we find that the tau and bottom Yukawa interaction rates are too fast to be neglected. We identify an illustrative "lepton-mediated electroweak baryogenesis" scenario in which the baryon asymmetry is induced mainly through the presence of a left-handed leptonic charge. We derive analytic formulae for the computation of the baryon asymmetry that, in light of these effects, are qualitatively different from those in the established literature. In this scenario, for fixed CP-violating phases, the baryon asymmetry has opposite sign compared to that calculated using established formulae.
Chung Daniel J. H.
Garbrecht Björn
Ramsey-Musolf Michael. J.
Tulin Sean
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