Upsilon Production at the STAR Experiment with a Focus on New U+U Results

GeV, and detail the analysis in U+U collisions at p sNN = 193 GeV. Results on production versus rapidity are consistent with pQCD predictions in p+p collisions. However, production in mid-rapidity ( |y|<0.5) d+Au collisions is suppressed with respect to p+p collisions beyond model predictions that take into account modification of parton distribution functions and initial parton energy loss inside nuclei. The nuclear modification factor RAA shows a significant suppression in central Au+Au and U+U collisions, consistent with model calculations including color screening eects in a deconfined medium.