Monte Carlo simulation of J/psi suppression based on GCP code

The production and absorption of J/psi at SPS energy in p-A and A-A collisions have been simulated by using the General Cascade Program (GCP). Nucleon absorption mechanism and comover absorption mechanism are considered to investigate the J/psi suppression. The results agree well with experimental data of J/psi production, except for the data in Pb-Pb collision.