Searches for exclusive Higgs and Z boson decays into a vector quarkonium state and a photon using 139 fb⁻¹ of ATLAS √s=13 TeV proton–proton collision data

Anders, J. K.; Beck, H. P.; Chatterjee, M.; Ereditato, A.; Franconi, L.; Halser, L.; Haug, S.; Ilg, A.; Müller, R.; O'Neill, A. P.; Schefer, M. M.; Weber, M. S. (2023). Searches for exclusive Higgs and Z boson decays into a vector quarkonium state and a photon using 139 fb⁻¹ of ATLAS √s=13 TeV proton–proton collision data. The European physical journal. C, Particles and fields, 83(9) Springer 10.1140/epjc/s10052-023-11869-1

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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 √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 × 10−4, 10.5×10−4, and (2.5, 4.2, 3.4)×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 × 10−6 , 2.4 × 10−6, and (1.1, 1.3, 2.4) × 10−6. An observed 95% CL interval of (−133, 175) is obtained for the κc/κγ ratio of Higgs boson coupling modifiers, and a 95% CL interval of (−37, 40) is obtained for κb/κγ.

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