J/ψ and γ Photoproduction at Relativistic Heavy-Ion Collider

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 P_t < 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 P_t heavy quark Q_c and gluon fragmantizing into J /ψ are also studied in the range of 4 < P_t < 10 GeV.