Nuclear Shadowing Effect on K Factor in Au-Au Collision

We investigate the nuclear shadowing effect on K factor in the Drell-Yan process by introducing a shadowing factor into the corresponding quantum chromodynamical α_s order corrections. K factors for Au-Au collision are calculated at the center-of-mass system energies √s = 60, 130 and 200 GeV while the nuclear shadowing factor is taken into account. The numerical results indicate that the nuclear shadowing factor obviously raises the K value in the small x region, and for the same nucleon the K value becomes smaller as the energy increases. Nuclear shadowing effect would be one reason of creating the non-constancy of the K factor.