J/$ψ$ production and suppression in nuclear collisions

In terms of a new QCD factorization formula for J/$ψ$ production, we calculate the J/$ψ$ suppression in nuclear collisions by including the multiple scattering between the pre-J/$ψ$ partonic states and the nuclear medium. We find agreement with all data on J/$ψ$ suppression in hadron-nucleus and nucleus-nucleus collisions, except a couple of points (the ``second drop'') at the highest $E_T$ bins of the new NA50 data.

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