Recent Heavy Quarkonia Results from PHENIX

Abstract

Measurements of quarkonia production in heavy ion collisions provide a direct probe of the screening length in the quark gluon plasma (QGP). However, a full interpretation of the heavy ion results requires a detailed understanding of the baseline cold nuclear matter (CNM) effects. These proceedings present recent PHENIX results on quarkonia production in heavy ion collisions, including new measurements of J / ψ production in Au + Au collisions at s N N = 39 & 62.4 GeV , as well as measurements of quarkonia production in d + Au collisions used to quantify the CNM effects present at RHIC. New measurements of ψ ′ production in d + Au collisions at midrapidity show a suppression in central events which is significantly larger than that observed for the J / ψ , a result which is unexpected based on measurements of J / ψ and ψ ′ production in p + A collisions at lower energies.