HIGH-PRECISION S PSI AND UPSILON-PRODUCTION DATA AND THE NUCLEAR GLUE/

We use the high statistics E772 data on the nuclear dependence of the production of quarkonia (J/psi and Upsilon) and dimuons at large trans verse momentum (p(T)) in p-A collisions to get information about the g luonic EMC effect. We find a satisfactory quantitative agreement of th e theoretical predictions with the data, although none of the models o f the EMC effect we consider could account for the entire data. Noneth eless, our results suggest that these data can now be used for a bette r determination of the nuclear parton densities. Our conclusions are s hown to be insensitive to the hadronization mechanism for the quarkoni a.