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To investigate the high mass dilepton production cross section produced dueto the Drell-Yan process in hadronic collisions such as nucleon- nucleus, thevalence and sea quarks distribution functions inside nucleus is used. In thisstudy, in the framework of the shell and Fermi gas models, by adding quarksdistribution functions of pions inside nucleus besides the quarks distributionfunctions of bound nucleons, the changes in the dilepton production crosssection were investigated. For this reason, pionic contribution in thestructure function of 63Cunucleus and its EMC ratio was first studied using theaforementioned models. Then, in the framework of the Drell-Yan process usingGRV's nucleons and pions quarks distribution functions, the high mass dileptonproduction cross section in p-cu collision was calculated and compared with theavailable experimental data. The extracted results, based on the two mentionedmodels, were greatly the same and by considering the pionic contribution, thetheoretical results were consistent with the experimental data.

Pionic contribution in the Drell-Yan dilepton production cross section in p-Cu collision in the framework of the shell and Fermi gas models