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

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  • The ATLAS collaboration
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<mark>Journal publication date</mark>10/11/2018
<mark>Journal</mark>Physics Letters B
Volume786
Number of pages22
Pages (from-to)134-155
Publication statusPublished
Original languageEnglish

Abstract

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 36.1fb−1collected at √s = 13 TeV with the ATLAS detector at 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 /ψ γ, ψ(2S) γ, and ϒ(nS) γof 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 Zboson decays are 2.3 ×10−6, 4.5 × 10−6and (2.8, 1.7, 4.8) × 10−6, respectively.