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Central exclusive production of $J/ψ$ and $ψ(2S)$ mesons in $pp$ collisions at $\sqrt{s}=13~$TeV

Abstract

Measurements are reported of the central exclusive production of \jpsi and \psitwos mesons in collisions at a centre-of-mass energy of 13 TeV. Backgrounds are significantly reduced compared to previous measurements made at lower energies through the use of new forward shower counters. The products of the cross-sections and the branching fractions for the decays to dimuons, where both muons are within the pseudorapidity range , are measured to be The first uncertainties are statistical, the second are systematic, and the third are due to the luminosity determination. The cross-sections are also measured differentially for meson rapidities between 2.0 and 4.5. Good agreement is observed with theoretical predictions. Photoproduction cross-sections are derived and compared to previous experiments, and a deviation from a pure power-law extrapolation of lower energy data is observed.