CMS-PAS-BPH-22-001

CMS-PAS-BPH-22-001
Measurement of the $\mathrm{B}^0_\mathrm{s}$ effective lifetime in the decay $\mathrm{B}^0_\mathrm{s}\to\mathrm{J}/\psi\,\mathrm{K}^0_\mathrm{S}$ from pp collisions at $\sqrt{s} =$ 13 TeV
CMS Collaboration
28 March 2024

Abstract: The effective lifetime of the $\mathrm{B}^0_\mathrm{s}$ meson in the decay $\mathrm{B}^0_\mathrm{s}\to\mathrm{J}/\psi \, \mathrm{K}^0_\mathrm{S}$ is measured using data collected during 2016-2018 with the CMS detector in $\sqrt{s}=$ 13 TeV proton-proton collisions at the LHC, corresponding to an integrated luminosity of 140 fb $^{-1}$ . The effective lifetime is determined by performing a two-dimensional unbinned maximum likelihood fit to the $\mathrm{B}^0_\mathrm{s}\to\mathrm{J}/\psi\, \mathrm{K}^0_\mathrm{S}$ meson invariant mass and proper decay time distributions. The resulting value is 1.59 $\pm$ 0.07 (stat) $\pm$ 0.03 (syst) ps, where the first uncertainty represents the statistical uncertainty and the latter corresponds to the systematic uncertainty.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

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