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- W2904171702 abstract "A study of the decays $B^0_s to mu^+mu^-$ and $B^0 to mu^+mu^-$ has been performed using 26.3 fb$^{-1}$ of 13 TeV LHC proton-proton collision data collected with the ATLAS detector in 2015 and 2016. Since the detector resolution in $mu^+mu^-$ invariant mass is comparable to the $B_{s}^{0}$-$B^0$ mass difference, a single fit determines the signal yields for both decay modes. This results in a measurement of the branching fraction ${cal B}(B^0_s to mu^+mu^-) = left( 3.2^{+1.1}_{-1.0} right) times 10^{-9}$ and an upper limit ${cal B}(B^0 to mu^+mu^-) < 4.3 times 10^{-10}$ at 95% confidence level. The result is combined with the Run 1 ATLAS result, yielding ${cal B}(B^0_s to mu^+mu^-) = left( 2.8^{+0.8}_{-0.7} right) times 10^{-9}$ and ${cal B}(B^0 to mu^+mu^-) < 2.1 times 10^{-10}$ at 95% confidence level. The combined result is consistent with the Standard Model prediction within 2.4 standard deviations in the ${cal B}(B^0 to mu^+mu^-)$-${cal B}(B^0_s to mu^+mu^-)$ plane." @default.
- W2904171702 created "2018-12-22" @default.
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