Study of the rare decays of $B_s^0$ and $B^0$ into muon pairs from data collected during the LHC Run 1 with the ATLAS detector

Abstract

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

Comments: 29 pages plus author list + cover pages (46 pages total), 9 figures, 5 tables, submitted to Eur. Phys. J. C., regular article. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2012-01/

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