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Aaboud, M.; Aad, G.; Abbott, B.; Adomeit, Stefanie; Bender, M. (2016): Study of the rare decays of B-s⁰ and B⁰ into muon pairs from data collected during the LHC Run 1 with the ATLAS detector. In: European Physical Journal C, Vol. 76, Nr. 9, 513
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Abstract

A study of the decays B-s(0) -> mu(+)mu(-) and B-0 -> mu(+)mu(-) has been performed using data corresponding to an integrated luminosity of 25 fb(-1) of 7 and 8 TeV proton-proton collisions collected with the ATLAS detector during the LHC Run 1. For the B-0 dimuon decay, an upper limit on the branching fraction is set at B(B-0 -> mu(+)mu(-)) < 4.2 x 10(-10) at 95% confidence level. For B-s(0), the branching fraction B(B-s(0) -> mu(+)mu(-)) = (0.9(-0.8)(+1.1)) x 10(-9) is measured. The results are consistent with the Standard Model expectation with a p value of 4.8%, corresponding to 2.0 standard deviations.