The dependence of J/ψ-nucleon inelastic cross section on the Feynman variable  

作　　者：段春贵 刘娜 苗文丹 

机构地区：[1]Department of Physics,Hebei Normal University [2]Hebei Advanced Thin Films Laboratory [3]CCAST(World Laboratory),P.O.Box 8730 [4]College of Mathematics and Physics,Shijiazhuang University of Economics

出　　处：《Chinese Physics C》2011年第9期804-807,共4页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (11075044);Natural Science Foundation of Hebei Province(A2008000137)

摘　　要：By means of two typical sets of nuclear parton distribution functions, meanwhile taking account of the energy loss of the beam proton and the nuclear absorption of the charmonium states traversing the nuclear matter in the uniform framework of the Glauber model, a leading order phenomenological analysis is given in the color evaporation model of the E866 experimental data on J/ψ production differential cross section ratios RFe/Be（XF）. It is shown that the energy loss effect of beam proton on RFe/Be（XF） is more important than the nuclear effects on parton distribution functions in the high Feynman variable XF region. It is found that the J/ψ-nucleon inelastic cross section depends on the Feynman variable xF and increases linearly with XF in the region XF 〉 0.2.By means of two typical sets of nuclear parton distribution functions, meanwhile taking account of the energy loss of the beam proton and the nuclear absorption of the charmonium states traversing the nuclear matter in the uniform framework of the Glauber model, a leading order phenomenological analysis is given in the color evaporation model of the E866 experimental data on J/ψ production differential cross section ratios RFe/Be（XF）. It is shown that the energy loss effect of beam proton on RFe/Be（XF） is more important than the nuclear effects on parton distribution functions in the high Feynman variable XF region. It is found that the J/ψ-nucleon inelastic cross section depends on the Feynman variable xF and increases linearly with XF in the region XF 〉 0.2.

关 键 词：J/ψ production nuclear effect energy loss nuclear absorption 

分 类 号：O571.6[理学—粒子物理与原子核物理]