title: J/psi suppression in nucleus-nucleus collisions.
abstract: We propose a model for calculating J/psi suppression in high-energy hadron-nucleus and nucleus-nucleus collisions. We factorized the process into a production of the cc- pairs convoluted with a transition probability into the observed J/psi mesons. As the produced cc- pairs exit the nuclear matter, multiple scattering increases the square of the relative momentum between the c and c- such that some pairs are transmuted into open charm states. With only one parameter, the energy gained by the produced cc- pair per unit length in the nuclear medium, our model can fit all observed J/psi suppression data in hadron-nucleus and nucleus-nucleus collisions.
authors.affiliation: Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Qiu
authors.forename: James P
authors.initials: JP
authors.lastname: Vary
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Zhang