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The coherent photonuclear production of a $\mathrm{J/}\psi$ vector meson atthe LHC has been computed using two different sets of solutions of theimpact-parameter dependent Balitsky-Kovchegov equation. The nuclear dipolescattering amplitudes are obtained either from ($i$) solutions for this processoff proton targets coupled with a Glauber-Gribov prescription, or ($ii$) fromsolutions obtained with an initial condition representing the nucleus. Theseapproaches predict different cross sections, which are compared with existingdata from ultra-peripheral collisions at the LHC. The latter approach seems tobetter describe current measurements. Future LHC data should be precise enoughto select one of the two approaches as the correct one.

Photonuclear $\mathbf{\mathrm{J/}\psi}$ production at the LHC: proton-based versus nuclear dipole scattering amplitudes