J/psi Production and Absorption in High Energy Proton-Nucleus Collisions
  Measured J/Psi production cross sections for 200 and 450 GeV/c protons incident on a variety of nuclear targets are analyzed within a Glauber framework which takes into account energy loss of the beam proton, the time delay of particle production due to quantum coherence, and absorption of the J/Psi on nucleons. The best representation is obtained for a coherence time of 0.5 fm/c, previously determined by Drell-Yan production in proton-nucleus collisions, and an absorption cross section of 3.6 mb, which is consistent with the value deduced from photoproduction of the J/Psi on nuclear targets. 
Charles Gale (1), Sangyong Jeon (2) and Joseph Kapusta (3) ((1) McGill   University, (2) LBNL, (3) University of Minnesota)