Electroweak phase transition in split SUSY *

* Talk given at the 8th International Moscow School of Physics

Abstract

The existence of the strongly first order electroweak phase transition (EWPT) in Early Universe is one of the necessary conditions for successful electroweak baryogenesis. To incorporate this idea we generalize Split SUSY model by splitting Z ₃-symmetric NMSSM instead of MSSM. We have found that the strongly first order phase transition can take place in models where effective μ-parameter is of the order of splitting scale (so called μ-split scenario), while in models where μ is of the order of electroweak scale the phase transition is weaker.

Keywords:

• Supersymmetry
• Electroweak baryogenesis
• Electroweak phase transition
• Split SUSY

Acknowledgements

I thank O.S. Gorbunov for a fruitful collaboration and V.A. Rubakov for helpful discussions. I am indebted to the Organizing Committee of 8th International Moscow School of Physics (33 ITEP Winter School) for hospitality. This work was supported in part by the GPRFNS-2184.2003.2 grants. The work was also supported in part by a fellowships of the “Dynasty” foundation (awarded by the Scientific Council of ICFPM), by a fellowship of the “Russian Science Support Foundation” and by RFBR grant 04-02-17448.

Notes

* Talk given at the 8th International Moscow School of Physics

†In Standard Model the only source of CP-violation is CKM phase. Even if the phase transition would be of the first order amount of CP is not sufficient to give needed value of the baryon asymmetry. But here we do not discuss CP-violation.