Equivalent photons in proton-proton and ion-ion collisions at the LHC

Abstract

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.

Comments: 15 p., 7 figs, 4 tables. Appendix C is added where the photon spectrum dependence on the impact parameter is considered and the survival factor that takes into account overlap of the colliding particles in the transverse direction is defined