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arXiv, 2022

DOI: 10.48550/arxiv.2208.03122

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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

Journal article published in 2023 by Georges Aad ORCID, T. P. A. Åkesson, D. Bakshi Gupta, M. Barbero, Braden Abbott ORCID, T. Barillari, P. Baron, Dale C. Abbott, D. A. Baron Moreno, Kira Abeling, Syed Haider Abidi, L. Barranco Navarro, J. Barreiro Guimarães da Costa, Asmaa Aboulhorma, M. G. Barros Teixeira and other authors.
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This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

Searches for the exclusive decays of Higgs and $Z$ bosons into a vector quarkonium state and a photon are performed in the $μ^+μ^- γ$ 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 $J/ψγ$, $ψ(2S) γ$, and $Υ(1S,2S,3S) γ$ are found to be $2.0\times10^{-4}$, $10.5\times10^{-4}$, and $(2.5,4.2,3.4)\times10^{-4}$, 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 $1.2\times10^{-6}$, $2.4\times10^{-6}$, and $(1.1,1.3,2.4)\times10^{-6}$. An observed 95% CL interval of $(-133,175)$ is obtained for the $κ_c/κ_γ$ ratio of Higgs boson coupling modifiers, and a 95% CL interval of $(-37,40)$ is obtained for $κ_b/κ_γ$.