$\Delta F=2$ processes in the MSSM in large $\tan \beta$ limit

Abstract

We discuss corrections to $\Delta M_{B_d}$, $\Delta M_{B_s}$ and to the CP violation parameter $ϵ$ in two examples of (generalized) minimal flavour violation models: 2HDM and MSSM in the large $\tan \beta$ limit. We show that for $H^{+}$ not too heavy, $\Delta M_{B_s}$ in the MSSM with heavy sparticles can be substantially smaller than in the SM due the charged Higgs box contributions and in particular due to the growing like ${\tan }^4\beta$ contribution of the double penguin diagrams involving neutral Higgs boson exchanges.

Comments: 5 pages, 2 Postscript figures, to appear in the proceedings of the 9th International Conference on Supersymmetry and Unification of Fundamental Interactions SUSY'01, June 11-17, Dubna, Russia