CMS-PAS-BPH-21-006

CMS-PAS-BPH-21-006
Measurement of ${\mathrm B^0_s}\to\mu^+\mu^-$ decay properties and search for the ${\mathrm B}^0\to\mu\mu$ decay in proton-proton collisions at $\sqrt{s}=$ 13 TeV
CMS Collaboration
July 2022

Abstract: We report a measurement of the ${\mathrm B^0_s}\to\mu^+\mu^-$ branching fraction and its effective lifetime, as well as results of a search for the ${\mathrm B}^0\to\mu^+\mu^-$ 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 measured branching fraction of the ${\mathrm B^0_s}\to\mu^+\mu^-$ decay and the effective ${\mathrm B^0_s}$ lifetime are the most precise measurements to date. No evidence for the ${\mathrm B}^0\to\mu^+\mu^-$ decay has been found. All results are found to be consistent with the standard model predictions.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, PLB 842 (2023) 137955. The superseded preliminary plots can be found here.

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