We use a kT-factorization approach, to calculate the amplitude for the diffractive γp → Vp processes, where V is a J/ψ or ψ(2S) vector meson. Using these amplitudes, we evaluate the cross section for exclusive photoproduction of J/ψ, ψ(2S) mesons in proton-proton collisions. We compare our results to LHCb data for a variety of unintegrated gluon distributions of the proton. We then turn to the related diffractive production in proton dissociative events. In this talk we concentrated on electromagnetic dissociation, which is calculable without additional free parameters. Dissociative events constitute an important experimental background to exclusive production.
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