Electroweak baryogenesis with dimension-6 higgs interactions

Abstract

We present the computation of the baryon asymmetry in the SM amplified by dimension-6 Higgs interactions using the WKB approximation. Analyzing the one-loop potential it turns out that the phase transition is strongly first order in a wide range of the parameters. It is ensured not to wash out the net baryon number gained previously even for Higgs masses up to at least 170 GeV. In addition dimension-6 operators induce new sources of CP violation. Novel source terms which enhance the generated baryon asymmetry emerge in the transport equations. This model predicts a baryon to entropy ratio close to the observed value for a large part of the parameter space.

The speech was mainly based on our recent work (D. Bödeker, L. Fromme, S.J. Huber, M. Seniuch, The baryon asymmetry in the standard model with a low cut-off, JHEP 0502 026 (2005) [hep-ph/0412366]).

Keywords:

• Dimension-6 operators
• Baryogenesis
• Electroweak phase transition
• Sphaleron transitions

Acknowledgements

I would like to thank Dietrich Bödeker, Stephan J. Huber and Michael Seniuch for a very fruitful and pleasant collaboration as well as Steffen Weinstock and Jörg Erdmann for helpful discussions. This work was supported by the DFG, grant FOR 339/2-1.