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Equivalent photons in proton and ion—ion collisions at the LHCa National Research Center "Kurchatov Institute", Alikhanov Institute of Theoretical and Experimental Physics, ul. B. Cheremushkinskaya 25, Moscow, 117218, Russian Federation b HSE University, ul. Myasnitskaya 20, Moscow, 101000, Russian Federation c National Research Nuclear University ‘MEPhI’, Kashirskoe shosse 31, Moscow, 115409, Russian Federation Equivalent photon approximation is used to calculate fiducial cross sections for dimuon production in ultraperipheral proton—proton and lead—lead collisions. Analytical formulae taking into account experimental cuts are derived. The results are compared with the measurements reported by the ATLAS collaboration.
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