$\hat{I}\yen$ Production in Heavy-Ion Collisions from the STAR Experiment

Abstract

In these proceedings, we present recent results of $\hat{I}\yen$ measurements in heavy-ion collisions from the STAR experiment at RHIC. Nuclear modification factors ($R_{AA}$) for $\hat{I}\yen (1S)$ and $\hat{I}\yen (1S+2S+3S)$ in U+U collisions at \sqrtsNN\ = 193 GeV are measured through the di-electron channel and compared to those in Au+Au collisions at \sqrtsNN\ = 200 GeV and Pb+Pb collisions at \sqrtsNN\ = 2.76 TeV. The ratio between the $\hat{I}\yen (2S+3S)$ and $\hat{I}\yen (1S)$ yields in Au+Au collisions at \sqrtsNN\ = 200 GeV is measured in the di-muon channel and compared to those in p+p collisions and in Pb+Pb collisions at \sqrtsNN\ = 2.76 TeV. Prospects for future $\hat{I}\yen$ measurements with the STAR experiment are also discussed.

Hard Probes 2016 proceedings