The ALICE Collaboration reports three measurements in ultraperipheral proton-lead collisions at forward rapidity. The exclusive two-photon process $\gamma \gamma \to {\mu }^{+}{\mu }^{-}$ 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 $2.5\mathrm{GeV}/c^2$ 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.

• Received 10 May 2023
• Accepted 12 October 2023
• Corrected 20 March 2024

DOI:https://doi.org/10.1103/PhysRevD.108.112004

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