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| CMS-PAS-SMP-22-012 | ||
| Search for the rare decays of the Z and Higgs bosons to a $ \mathrm{J}/\psi $ or $ \psi^{\prime} $ meson and a photon in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 30 November 2023 | ||
| Abstract: A search is performed for the rare decays of the Z and Higgs bosons to a photon and a charmed meson $ \mathrm{J}/\psi $ or $ \psi^{\prime} $, which subsequentially decays to a pair of muons. The data set corresponds to an integrated luminosity of 123 fb$ ^{-1} $ of proton-proton collisions at $ \sqrt{s}= $ 13 TeV collected with the CMS detector at the LHC. The presence of two resonances in the signal is used to discriminate and estimate the non-resonant backgrounds. No evidence for branching fractions to these rare decay channels larger than predicted in the standard model is observed. Upper limits at 95% confidence level are set on $ \mathcal{B}(\mathrm{H}\to\mathrm{J}/\psi\gamma) < 2.6 \times 10^{-4} $, $ \mathcal{B}(\mathrm{H}\to\psi^{\prime}\gamma) < 9.9 \times 10^{-4} $, $ \mathcal{B}(\mathrm{Z}\to\mathrm{J}/\psi\gamma) < 0.6 \times 10^{-6} $ and $ \mathcal{B}(\mathrm{Z}\to\psi^{\prime}\gamma) < 1.3 \times 10^{-6} $. The ratio of the Higgs boson coupling modifiers $ \kappa_{c}/\kappa_{\gamma} $ is constrained to be in the interval $ (-157,+199) $ at 95% confidence level. When assuming $ \kappa_{\gamma}= $ 1, the observed interval becomes $ (-166,+208) $. | ||
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Links:
CDS record (PDF) ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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