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Volume 326 - The International Conference on B-Physics at Frontier Machines (BEAUTY2018) - Session: Rare decays
$\mathrm{B}\to \mu^+\mu^-$ rare decays at CMS
G. Fedi* on behalf of the CMS collaboration
*corresponding author
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Pre-published on: 2018 July 31
Published on: 2018 October 30
We report on the results obtained from the search for leptonic decays $\mathrm{B^0_s}\to \mu^+\mu^-$ and $\mathrm{B^0}\to \mu^+\mu^-$ in pp collisions at $\sqrt{s}=7$ TeV and 8 TeV, collected at CMS during 2011 and 2012 data-taking, for a total of 25 fb$^{-1}$ of integrated luminosity. We measured the branching fraction $\mathcal{B}$($\mathrm{B^0_s}\to \mu^+\mu^-$)=$(3.0^{+1.0}_{-0.9})\times 10^{-9}$ and we observed an excess of $\mathrm{B^0_s}\to \mu^+\mu^-$ events with a significance of 4.3 standard deviations. We measured the upper limit for the branching fraction of the $\mathrm{B^0}\to \mu^+\mu^-$, $\mathcal{B}$($\mathrm{B^0}\to \mu^+\mu^-$)<1.1 $\times 10^{-9}$, at 95% confidence level. We also report on the combined analysis of LHCb and CMS results and present the first observation of the $\mathrm{B^0_s}\to \mu^+\mu^-$ decay. The branching fractions of this decay as well as of the $\mathrm{B^0}\to \mu^+\mu^-$ decay are presented.
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