J/ψ and γ Photoproduction at Relativistic Heavy-Ion Collider
LI Yun-de1, XU Xiao-mei2, LIU Lian-shou3
1Department of Physics, Yunnan University, Kunming 650091
2Department of Physics, Yunnan Normal University, Kunming 650092
3Institute of Particle Physics, Huazhong Normal University, Wuhan 430070
J/ψ and γ Photoproduction at Relativistic Heavy-Ion Collider
LI Yun-de1;XU Xiao-mei2;LIU Lian-shou3
1Department of Physics, Yunnan University, Kunming 650091
2Department of Physics, Yunnan Normal University, Kunming 650092
3Institute of Particle Physics, Huazhong Normal University, Wuhan 430070
Abstract： Hard photoproduction of J /ψ and γ at the Relativistic Heavy-Ion Collider Au-Au, I-I, Cu-Cu, Si-Si, and 0-0 collisions is discussed in the process A+A → A+ J/ψ ( γ ) + X . It shows that in the rang of transverse momentum Pt < 4GeV the hard photoproduction process can be used to test the gluon distribution in the nucleus. So the process also provides a new way of testing the EMC effects. The large Pt heavy quark Qc and gluon fragmantizing into J /ψ are also studied in the range of 4 < Pt < 10 GeV.
(Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions))
1999, Vol. 16 
