Search for the decay B⁰_s → μ+μ- with the ATLAS detector

Abstract

A blind analysis searching for the decay B⁰_s → μ+ μ- has been performed using proton–proton collisions at a centre-of-mass energy of 7 TeV recorded with the ATLAS detector at the LHC. With an integrated luminosity of 2.4 fb^-1 no excess of events over the background expectation is found and an upper limit is set on the branching fraction BR( B⁰_s → μ+ μ- ) < 2.2(1.9) × 10^-8 at 95% (90%) confidence level.