Searches for exclusive Higgs and ℤ boson decays into J/ψγ, ψ(2S)γ, and Υ(nS)γ at √s = 13 TeV with the ATLAS detector

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Searches for exclusive Higgs and ℤ boson decays into J/ψγ, ψ(2S)γ, and Υ(nS)γ at √s = 13 TeV with the ATLAS detector. Physics letters. B, 786, pp. 134-155. Elsevier 10.1016/j.physletb.2018.09.024

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Searches for the exclusive decays of the Higgs and Z bosons into a J/ψ, ψ(2S), or Υ(nS) (n=1,2,3) meson and a photon are performed with a pp collision data sample corresponding to an integrated luminosity of 36.1 fb⁻¹ collected at √s = 13 TeV with the ATLAS detectorat the CERN Large Hadron Collider. No significant excess of events is observed above the expected backgrounds, and 95% confidence-level upper limits on the branching fractions of the Higgs boson decays to J/ψγ, ψ(2S)γ, and Υ(nS)γ of 3.5×10⁻⁴, 2.0×10⁻³, and (4.9, 5.9, 5.7) × 10⁻⁴, respectively, are obtained assuming Standard Model production. The corresponding 95% confidence-level upper limits for the branching fractions of the Z boson decays are 2.3×10⁻⁶, 4.5×10⁻⁶ and (2.8, 1.7, 4.8) × 10⁻⁶, respectively.

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