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

Abstract

Searches for the exclusive decays of Higgs and $Z$ bosons into a vector quarkonium state and a photon are performed in the ${\mu }^{+}{\mu }^{-}\gamma$ final state with a proton$-$proton collision data sample corresponding to an integrated luminosity of $139$ fb${}^{-1}$ collected at $\sqrt{s}=13$ TeV with the ATLAS detector at the CERN Large Hadron Collider. The observed data are compatible with the expected backgrounds. The 95% confidence-level upper limits on the branching fractions of the Higgs boson decays into $J/\psi \gamma$, $\psi (2S)\gamma$, and ${\rm Y}(1S,2S,3S)\gamma$ are found to be $2.0\times 10^{-4}$, $10.5\times 10^{-4}$, and $(2.5,4.2,3.4)\times 10^{-4}$, respectively, assuming Standard Model production of the Higgs boson. The corresponding 95% CL upper limits on the branching fractions of the $Z$ boson decays are $1.2\times 10^{-6}$, $2.4\times 10^{-6}$, and $(1.1,1.3,2.4)\times 10^{-6}$. An observed 95% CL interval of $(-133,175)$ is obtained for the ${\kappa }_c/{\kappa }_{\gamma }$ ratio of Higgs boson coupling modifiers, and a 95% CL interval of $(-37,40)$ is obtained for ${\kappa }_b/{\kappa }_{\gamma }$.

47 pages in total, author list starting page 30, 7 figures, 6 tables, published as Eur. Phys. J. C 83 (2023) 781. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-53

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