Nuclear Shadowing Effect on K Factor in Au-Au Collision
HOU Zhao-Yu1,2, ZHENG Qiao3, ZHANG Ben-Ai2
1Department of Physics, Shijiazhuang Normal College, Shijiazhuang 050801
2Graduate School, Chinese Academy of Engineering Physics, Beijing 100088
3Department of Mathematics and Physics, Shijiazhuang Railway College, Shijiazhuang 050043
Nuclear Shadowing Effect on K Factor in Au-Au Collision
HOU Zhao-Yu1,2;ZHENG Qiao3;ZHANG Ben-Ai2
1Department of Physics, Shijiazhuang Normal College, Shijiazhuang 050801
2Graduate School, Chinese Academy of Engineering Physics, Beijing 100088
3Department of Mathematics and Physics, Shijiazhuang Railway College, Shijiazhuang 050043
Abstract： We investigate the nuclear shadowing effect on K factor in the Drell-Yan process by introducing a shadowing factor into the corresponding quantum chromodynamical αs 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.
2002, Vol. 19 
