Higgs-mediated FCNC in Supersymmetic Models with Large $\tan \beta$

Abstract

In the supersymmetric models with nontrivial flavour structure in the soft-breaking sector the exchange of neutral Higgses mediates $\Delta F=2$ transitions. This mechanism is studied for $\Delta S,\Delta B=2$ processes and for a generic form of the soft-breaking terms. We find that Higgs-mediated FCNC amplitudes increase very rapidly with $\tan \beta$ and can exceed $SUSY$ box contribution by up to two orders of magnitude when $\tan \beta \sim m_t/m_b$.

15 pages, latex, 3 figures

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• $b\to s\gamma$ Constraints on the Minimal Supergravity Model with Large $\tan \beta$
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