Investigation of diffractive photoproduction of $J/\Psi$ in hadronic   collisions
  In this work we study the diffractive photoproduction of $J/\Psi$ in proton-proton, proton - nucleus and nucleus - nucleus collisions at LHC energies using the color dipole formalism and different models for the forward dipole - target scattering amplitude. Our goal is to estimate the theoretical uncertainty present in the current predictions in the literature. Our results are compared with the experimental data and predictions for higher energies are presented. 
V. P. Goncalves, B. D. Moreira, F. S. Navarra
hep-ph hep-ex nucl-ex nucl-th