| This thesis reports on photoproduction of exclusive J/Psi mesons in ultra-peripheral PbPb and pPb collisions at √s NN = 2.76 TeV, and 5.02 TeV, respectively, from the CMS experiment at the LHC. For PbPb collisions, there is a correlation between the directions of the produced J/Psi and the neutron emitted by the struck nucleus. For J/Psi mesons with pT > 100 MeV/c, the ratio of the pT distributions for J/Psi is moving in the opposite direction as the neutrons emitted from the target nucleus to those for J/Psi is moving in the same direction as the neutrons, suggests significant shadowing in the lead nucleus.;For pPb collisions, the distributions of the J/Psis in transverse momentum have a similar form to previous measurements at HERA. The average pT increases with the photon-proton center of mass energy W. This implies that the spatial distribution of the gluons within the proton depends upon the gluon momentum. The cross-section also increases as W increases from 57 to 439 GeV implying that the proton becomes more and more opaque to photons as the photon energy increases. Parametrizing the growth of the cross section by the form sigma( W) infinity Wdelta yields a value of delta = 0.636 +/- 0.063. This result is consistent with the world average and has a precision comparable to other experiments. |
