Measurement of the B${}_{\mathrm{S}}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay properties and search for the B${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

Measurements are presented of the B${}_{\mathrm{S}}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ branching fraction and effective lifetime, as well as results of a search for the B${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the LHC. The analysis is based on data collected with the CMS detector in 2016-2018 corresponding to an integrated luminosity of 140 fb${}^{-1}$. The branching fraction of the B${}_{\mathrm{S}}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay and the effective B${}_{\mathrm{S}}^0$ meson lifetime are the most precise single measurements to date. No evidence for the B${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay has been found. All results are found to be consistent with the standard model predictions and previous measurements.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplemental figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-21-006 (CMS Public Pages)

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