Measurement of properties of B${}_{\mathrm{s}}^0\to {\mu }^{+}{\mu }^{-}$ decays and search for B${}^0\to {\mu }^{+}{\mu }^{-}$ with the CMS experiment

Abstract

Results are reported for the B${}_{\mathrm{s}}^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and effective lifetime and from a search for the decay B${}^0\to {\mu }^{+}{\mu }^{-}$. The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7 TeV (5 fb${}^{-1}$), 8 TeV (20 fb${}^{-1}$), and 13 TeV (36 fb${}^{-1}$). The branching fractions are determined by measuring event yields relative to B${}^{+}\to$ J/$\psi$K${}^{+}$ decays (with J/$\psi \to {\mu }^{+}{\mu }^{-}$), which results in the reduction of many of the systematic uncertainties. The decay B${}_{\mathrm{s}}^0\to {\mu }^{+}{\mu }^{-}$ is observed with a significance of 5.6 standard deviations. The branching fraction is measured to be $\mathcal{B}$(B${}_{\mathrm{s}}^0\to {\mu }^{+}{\mu }^{-}$) = [2.9 $\pm$ 0.7 (exp) $\pm$ 0.2 (frag)] $\times$ 10${}^{-9}$, where the first uncertainty combines the experimental statistical and systematic contributions, and the second is due to the uncertainty in the ratio of the B${}_{\mathrm{s}}^0$ and the B${}^{+}$ fragmentation functions. No significant excess is observed for the decay B${}^0\to {\mu }^{+}{\mu }^{-}$, and an upper limit of $\mathcal{B}$(B${}^0\to {\mu }^{+}{\mu }^{-}$) < 3.6 $\times$ 10${}^{-10}$ is obtained at 95% confidence level. The B${}_{\mathrm{s}}^0\to {\mu }^{+}{\mu }^{-}$ effective lifetime is measured to be ${\tau }_{{\mu }^{+}{\mu }^{-}}$ = 1.70 ${}_{-0.44}^{+0.61}$ ps. These results are consistent with standard model predictions.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-16-004 (CMS Public Pages)

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