Search for $B^{0}_{s}\rightarrow\mu^{+}\mu^{-}$ and $B^{0}\rightarrow\mu^{+}\mu^{-}$ decays in CMS

A search for the rare decays $B^0_{s}\rightarrow\mu^{+}\mu^{-}$ and $B^{0}\rightarrow\mu^{+}\mu^{-}$ performed in pp collisions at $\sqrt{s} = 7$~TeV is presented. The data sample, collected by the CMS experiment at the LHC, corresponds to an integrated luminosity of about 5~fb$^{-1}$, corresponding to all 2011 data taking.