Nuclear Suppression of Light Charmonia at SeaQuest*

The E906/SeaQuest experiment at Fermi National Laboratory took scattering data with the 120 GeV Main Injector proton beam on liquid hydrogen and deuterium targets, along with carbon, iron, and tungsten targets. Within the data are a significant number of muon pairs produced from the decay of J/Psi and Psi(2S) particles. In this talk, I present a study of the suppression of these light, charmed particles by cold nuclear media at SeaQuest. The data are divided into two analyses: first, cross sections for charmonia production on carbon, iron, and tungsten targets are compared with cross sections on hydrogen and deuterium targets to study the cross section ratio as a function of the atomic mass of the target; and second, each of the carbon, iron, and tungsten target effects on charmonia production are studied as a function of the transverse momentum and Feynman-x kinematic dimensions in the ranges 0.0 < pT < 1.5 GeV and 0.4 < xF < 0.95. The results are compared with previous experimental data from the E772 experiment as well as theoretical predictions from the Color Evaporation Model.