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arXiv · 2212.10311

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

CMS Collaboration
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Abstract

Measurements are presented of the B$^0_\mathrm{S}$ $\to$ $\mu^+\mu^-$ 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$^0_\mathrm{S}$ $\to$ $\mu^+\mu^-$ decay and the effective B$^0_\mathrm{S}$ 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.

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CMS Collaboration. 2022-12-20. Measurement of the B$^0_\mathrm{S}$ $\to$ $\mu^+\mu^-$ decay properties and search for the B$^0$ $\to$ $\mu^+\mu^-$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV. https://doi.org/10.1016/j.physletb.2023.137955

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