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

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, M.P. Heath, S. Palazzo, V.A. Parrish, E.A. Pender, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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/ψ γ , 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/κ γ ratio of Higgs boson
coupling modifiers, and a 95% CL interval of (−37, 40) is obtained for κb/κ γ.
Original languageEnglish
Article number781
Pages (from-to)1-33
Number of pages33
JournalThe European Physical Journal C
Volume83
Issue number9
DOIs
Publication statusPublished - 5 Sept 2023

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