Nuclear Suppression of Vector Meson Production in FNAL E866/NuSea

摘要

Measurements of the suppression of the yield per nucleon of J/ψ and ψ' production for 800 GeV/c protons incident on nuclear targets have been made with very broad coverage in x_F and p_T. Over 3 * 10~6 J/ψ's and 10~5 ψ''s with x_F between -0.10 and 0.93 and p_T up to 4 GeV/c were observed. Data for Be, Fe and W targets were used to determine the cross section ratio per nucleon between heavy and light targets for both the J/ψ and the ψ'. The largest suppression is observed at large x_F and small p_T values. The suppression for the ψ' is stronger than that for the J/ψ for x_F near zero, but becomes comparable to that for the J/ψ for x_F > 0.5.