J/Ψ-N center of mass energy dependence of nuclear absorption effect on J/Ψ production

Abstract

In this paper, the J/Ψ nuclear absorption effect is studied at RHIC and LHC energies with the EKS98 shadowing parameterizations. By assuming that the J/Ψ absorption cross section, σabs, increases with the charmonium-nucleon (J/Ψ-N) center of mass energy, √SJ/ΨN, it is found that σabs should depend on xF (or y) at a certain center of mass energy per nucleon pair, √s, especially at LHC energies. The theoretical results with the xF (or y)-dependence of the absorption effect are in good agreement with the experiment data from PHENIX in d-Au collisions and the predicted results will be examined by the forthcoming experimental data from LHC in d-Pb collisions. Finally, we also present baseline calculations of cold nuclear matter effects on J/Ψ production in nucleus-nucleus (A-A) collisions and find that the xF (or y)-dependence of absorption effect is very small at both RHIC and LHC energies in A-A collisions.