b\to sν\barν decay in the MSSM: Implication of b\to sγat large tan beta

Abstract

The decay $b\to s\nu \bar{\nu }$ is discussed in the minimal supersymmetric standard model with general flavor mixing for squarks, at large $\tan \beta$. In this case, in addition to the chargino loop contributions which were analyzed in previously studies, $\tan \beta$-enhanced contributions from the gluino and charged Higgs boson loops might become sizable compared with the standard model contribution, at least in principle. However, it is demonstrated that the experimental bounds on the new physics contributions to the radiative decay $b\to s\gamma$ should strongly constrain these contributions to $b\to s\nu \bar{\nu }$, especially on the gluino contribution. We also briefly comment on a possible constraint from the $B_s\to {\mu }^{+}{\mu }^{-}$ decay.

arXiv comment17 pages, references added, figures refined

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