Coherent photoproduction of $\psi$ and $\mathrm{{\rm Y}}$ mesons in ultraperipheral pPb and PbPb collisions at the CERN LHC

Exclusive photoproduction of vector mesons in the perturbative two-gluon exchange formalism depends significantly on nucleon and nuclear gluon distributions. In the present study we calculate total cross sections and rapidity distributions of $J\mathrm{/}\psi (1s)$, $\psi (2s)$, $\mathrm{{\rm Y}}(1s)$, $\mathrm{{\rm Y}}(2s)$, and $\mathrm{{\rm Y}}(3s)$ in ultraperipheral proton-lead (pPb) and lead-lead (PbPb) collisions at the CERN Large Hadron Collider (LHC) at $\sqrt{s_{{}_{NN}}}=5$ TeV and $\sqrt{s_{{}_{NN}}}=2.76$ TeV respectively. Effects of gluon shadowing are investigated and potentials for constraining nuclear gluon modifications are discussed.