At the LHC, the highly boosted electromagnetic field of the beam particles represents a source of quasi-real photon. Vector meson photo-production measurements in pp/Pb-Pb collisions are sensitive to the gluon parton distribution functions in the proton/nucleus. LHCb results on charmonium production in ultra-peripheral Pb-Pb collisions at 5.02 TeV and in pp at 13 TeV will be presented.
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