Energy loss and $x_2$ scaling breakdown in $J/ψ$ nuclear production

Abstract

In addition to the final-state interactions, $J/ψ$ nuclear production might also be affected by parton energy loss. Using the upper limits from Drell-Yan data at SPS and Fermilab energies, we estimated energy loss contribution to $J/ψ$ production in p-A collisions. The results indicated that the effects might be sizeable at 200 GeV while remaining small at higher energies.

5 pages, 2 figures. Talk given at XXXVth Rencontres de Moriond, Les Arcs, France, 18-25 March 2000