The ALICE Collaboration reports three measurements in ultraperipheral proton-lead collisions at forward rapidity. The exclusive two-photon process gamma gamma ->mu(+)mu(-) 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 center-of-mass energies from 27 to 57 GeV. They are in good agreement with HERA results.
Exclusive and dissociative J/ψ photoproduction, and exclusive dimuon production, in p-Pb collisions at √sNN=8.16 TeV
Alocco, G;Beole, S;Bianchi, Livio;Botta, Elena;Ferretti, Alessandro;Gagliardi, Martino;Masera, Massimo;Mazzaschi, F;Pennisi, Michele;Pucillo, Sara;Quaglia, Luca;Terlizzi, Livia;Trogolo, S;Vercellin, E;
2023-01-01
Abstract
The ALICE Collaboration reports three measurements in ultraperipheral proton-lead collisions at forward rapidity. The exclusive two-photon process gamma gamma ->mu(+)mu(-) 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 center-of-mass energies from 27 to 57 GeV. They are in good agreement with HERA results.File | Dimensione | Formato | |
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PhysRevD.108.112004.pdf
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