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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=13TeV with the ATLAS detector
Ennis, Joseph Stanford.  Physics Letters B.  v. 786.   2018-11-10. p. 134 - 155... issn: 0370-2693 .   

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