Investigation of pionic contribution in the lepton and anti-lepton   production cross section in p-Cu and p-Pt collision
  For detailed explanation of the experimental results of lepton production cross section in hadronic collisions such as nucleon-nucleon or nucleon-nuclei, it is of great importance to use quarks and sea quarks distribution function inside free and bound nucleons. In this paper the role of pion cloud inside the nucleus in the structure function of Cu and Pt nuclei and the EMC ratio of these nuclei were investigated by using harmonic oscillator model. 
R. Rostami, F. Zolfagharpour
nucl-th hep-ph