J/ψSuppression in Nucleus-Nucleus Collisions

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 $c\overline{c}$ pairs convoluted with a transition probability into the observed $J/\psi$ mesons. As the produced $c\overline{c}$ pairs exit the nuclear matter, multiple scattering increases the square of the relative momentum between the $c$ and $\overline{c}$ such that some pairs are transmuted into open charm states. With only one parameter, the energy gained by the produced $c\overline{c}$ 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.