Bino-driven electroweak baryogenesis with highly suppressed electric dipole moments
It is conventional wisdom that successful electroweak baryogenesis in the Minimal Supersymmetric extension of the Standard Model (MSSM) is in tension with the non-observation of electric dipole moments (EDMs), since the level of CP-violation responsible for electroweak baryogenesis is believed to generate unavoidably large EDMs. We show that CP-violation in the bino–Higgsino sector of the MSSM can account for successful electroweak baryogenesis without inducing large EDMs. This observation weakens the correlation between electroweak baryogenesis and EDMs, and makes the bino-driven electroweak baryogenesis scenario the least constrained by EDM limits. Taking this observation together with the requirement of a strongly first-order electroweak phase transition, we argue that a bino-driven scenario with a light stop is the most phenomenologically viable MSSM electroweak baryogenesis scenario.
Additional Information© 2009 Elsevier B.V. Received 8 December 2008; revised 29 January 2009; accepted 5 February 2009. Editor: G.F. Giudice. Available online 7 February 2009. This work was supported US Department of Energy Contracts DE-FG02-08ER41531 (M.R.M. and Y.L.) and DE-FG02-04ER41268 (S.P.) and by the Wisconsin Alumni Research Foundation (M.R.M. and Y.L.). M.R.M. thanks the Department of Energy's Institute for Nuclear Theory at the University of Washington for its hospitality during the completion of this work.
Submitted - 0811.1987