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Observation of the rare B⁰_stoμ^+μ^- decay from the combined analysis of CMS and LHCb data
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arxiv 1411.4413 v2 pith:PQDVXUZB submitted 2014-11-17 hep-ex hep-ph
Observation of the rare B⁰_stoμ^+μ^- decay from the combined analysis of CMS and LHCb data
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A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\to\mu^+\mu^-$ decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far. Furthermore, evidence for the $B^0\to\mu^+\mu^-$ decay is obtained with a statistical significance of three standard deviations. The branching fraction measurements are statistically compatible with SM predictions and impose stringent constraints on several theories beyond the SM.
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