Search for rare decays of the Z and Higgs bosons to a J/$\psi$ or $\psi$(2S) meson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search is presented for rare decays of the Z and Higgs bosons to a photon and a J/$\psi$ or a $\psi$(2S) meson, with the charmonium state subsequentially decaying to a pair of muons. The data set corresponds to an integrated luminosity of 123 fb${}^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS detector at the LHC. No evidence for branching fractions of these rare decay channels larger than predicted in the standard model is observed. Upper limits at 95% confidence level are set: $\mathcal{B}$(H $\to$ J/$\psi \gamma$) $<$ 2.6 $\times$ 10${}^{-4}$, $\mathcal{B}$(H $\to$ $\psi$(2S)$\gamma$) $<$ 9.9 $\times$ 10${}^{-4}$, $\mathcal{B}$(Z $\to$ J/$\psi \gamma$) $<$ 0.6 $\times$ 10${}^{-6}$, and $\mathcal{B}$(Z $\to$ $\psi$(2S)$\gamma$) $<$ 1.3 $\times$ 10${}^{-6}$. The ratio of the Higgs boson coupling modifiers ${\kappa }_{\mathrm{c}}/{\kappa }_{\gamma }$ is constrained to be in the interval ($-$157, $+$199) at 95% confidence level. Assuming ${\kappa }_{\gamma }=1$, this interval becomes ($-$166, $+$208).

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-22-012 (CMS Public Pages)

References in corpus (25)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• The Catchment Area of Jets
• A portrait of the Higgs boson by the CMS experiment ten years after the discovery
• A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
• Performance of the CMS Level-1 trigger in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Precision luminosity measurement in proton-proton collisions at $\sqrt{s}=$ 13 TeV in 2015 and 2016 at CMS
• Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
• Pileup mitigation at CMS in 13 TeV data
• Handling uncertainties in background shapes: the discrete profiling method
• Measurements of Higgs boson production cross sections and couplings in the diphoton decay channel at $\sqrt{s}=$ 13 TeV
• Relativistic corrections to Higgs boson decays to quarkonia
• Direct constraint on the Higgs-charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector
• Rare exclusive decays of the Z-boson revisited
• Search for Higgs boson decay to a charm quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• $Z$-boson decays to a vector quarkonium plus a photon
• Rare and exclusive few-body decays of the Higgs, Z, W bosons, and the top quark
• Addendum: New approach to the resummation of logarithms in Higgs-boson decays to a vector quarkonium plus a photon [Phys. Rev. D 95, 054018 (2017)]
• Searches for exclusive Higgs and $Z$ boson decays into a vector quarkonium state and a photon using $139$ fb${}^{-1}$ of ATLAS $\sqrt{s}=13$ TeV proton$-$proton collision data
• Search for Higgs boson and observation of Z boson through their decay into a charm quark-antiquark pair in boosted topologies in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• $Z$ boson radiative decays to a $S$-wave quarkonium at NNLO and NLL accuracy

Cited by in corpus (2)

• Rare few-body decays of the Standard Model Higgs boson
• Improved analysis of rare $Z$-boson decays into a heavy vector quarkonium plus lepton pair