Exclusive and dissociative J/$\psi$ photoproduction, and exclusive dimuon production, in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV

Abstract

The ALICE Collaboration reports three measurements in ultra-peripheral proton$-$lead collisions at forward rapidity. The exclusive two-photon process \ggmm and the exclusive photoproduction of J/$\psi$ are studied. J/$\psi$ photoproduction with proton dissociation is measured for the first time at a hadron collider. The cross section for the two-photon process of dimuons in the invariant mass range from 1 to 2.5 GeV/$c^2$ agrees with leading order quantum electrodynamics calculations. The exclusive and dissociative cross sections for J/$\psi$ photoproductions are measured for photon$-$proton centre-of-mass energies from 27 to 57 GeV. They are in good agreement with HERA results.

arXiv comment29 pages, 8 captioned figures, 4 tables, authors from page 24, published version, figures at http://alice-publications.web.cern.ch/node/9323

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• The energy dependence of exclusive heavy vector meson photoproduction cross-sections and NLO BFKL evolution
• Near-Threshold OPE Constraints and High-Energy Diffractive Dynamics in J/psi Photoproduction
• Dissociative associated $J/\psi$ and dimuon production in Ap ultraperipheral collisions via double parton scattering
• Exclusive process $\gamma \gamma \to J/\psi +\gamma$ production in ultraperipheral proton and nuclear collisions at the HL-LHC and FCC