Study of Strange B Mesons Decaying to mu mu in CMS

The rare leptonic decay $B_{s}^{0} \to \mu^{+} \mu^{-}$ has a highly suppressed rate in the Standard Model (SM) and is therefore a potentially sensitive probe of physics beyond the SM. In the minimal supersymmetric extension of the SM the branching fraction for this decay can be enhanced substantially, especially at large $\tan \beta$. In this note we present a Monte Carlo simulation study for the sensitivity of the decay $B_{s}^{0} \to \mu^{+} \mu^{-}$ with the CMS detector at the LHC with an integrated luminosity of $1\,\mathrm{fb}^{-1}$ at $\sqrt{s} = 14\tev$. The study is based on the full detector simulation of signal and background events.