Search for B_s⁰ → μ⁺μ^- and B⁰ → μ⁺μ^- decays in pp collisions at √s=7 TeV

Abstract

A search for the rare decays B⁰_s → μ⁺μ^- and B⁰ → μ⁺μ^- is performed in pp collisions at √s = 7 TeV, with a data sample corresponding to an integrated luminosity of 1:14 fb^-1, collected by the CMS experiment at the LHC. In both cases, the number of events observed after all selection requirements is consistent with expectations from background and standard-model signal predictions. The resulting upper limits on the branching fractions are B(B⁰_s → μ⁺μ^-)< 1.9 × 10^-8 and (B⁰ → μ⁺μ^-)< 4:6 × 10^-9, at 95% confidence level.