Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-BPH-22-012 | ||
| Test of lepton flavor universality violation in semileptonic $ \mathrm{B}_{\mathrm{c}}^+ $ meson decays at CMS | ||
| CMS Collaboration | ||
| 31 August 2023 | ||
| Abstract: A measurement of the ratio of branching fractions $ \mathrm{R}(\mathrm{J}/\psi) = \mathcal{B}(\mathrm{B}_{\mathrm{c}}^+\rightarrow\mathrm{J}/\psi\tau^+\nu_{\tau}) / \mathcal{B}(\mathrm{B}_{\mathrm{c}}^+\rightarrow\mathrm{J}/\psi\mu^+\nu_{\mu}) $ in the $ \mathrm{J}/\psi\rightarrow\mu^+\mu^- $, $ \tau^+\rightarrow\mu^+\nu_{\mu}\nu_{\bar{\tau}} $ decay channel is presented. This measurement uses a sample of proton-proton collision data at a center of mass energy of 13 TeV collected by the CMS experiment in 2018 and corresponding to 59.7 fb$ ^{-1} $ of integrated luminosity. The measured ratio $ \mathrm{R}(\mathrm{J}/\psi) = $ 0.17 $ ^{+ 0.18}_{- 0.17} $ (stat) $^{+ 0.21}_{- 0.22} $ (syst) $^{+ 0.19}_{- 0.18} $ (theo) $ = $ 0.17 $ \pm $ 0.33 agrees within 0.3 standard deviations with the value predicted by the standard model of particle physics. | ||
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Links:
CDS record (PDF) ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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