Recent results on $B\to {\mu }^{+}{\mu }^{-}$ decays with the CMS experiment

Abstract

Results on $B\to {\mu }^{+}{\mu }^{-}$ decays with the CMS experiment are reported, using 61 fb${}^{-1}$ of data recorded during LHC Run 1 and 2016. With an improved muon identification algorithm and refined unbinned maximum likelihood fitting methods, the decay $B_s^0\to {\mu }^{+}{\mu }^{-}$ is observed with a significance of 5.6 standard deviations. Its branching fraction is measured to be BF($B_s^0\to {\mu }^{+}{\mu }^{-}$) = [2.9+/-0.7(exp)+/-0.2(frag)]$\times 10^{-9}$, where the first error is the combined statistical and systematic uncertainty and the second error quantifies the uncertainty of the $B_s^0$ and $B^{+}$ fragmentation probability ratio. The $B_s^0\to {\mu }^{+}{\mu }^{-}$ effective lifetime is ${\tau }_{{\mu }^{+}{\mu }^{-}}=1.70_{-0.44}^{+0.61}$ps. No evidence for the decay $B^0\to {\mu }^{+}{\mu }^{-}$ is found and an upper limit of BF($B^0\to {\mu }^{+}{\mu }^{-}$) < 3.6$\times 10^{-10}$ (at 95% confidence level) is determined. All results are consistent with the standard model of particle physics.

arXiv commentInvited short review submitted to MPLA

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