Leading Hadron Production in $d$+Au and ${}^3$He+Au collisions in the PHENIX experiment

Abstract

Neutral pions have been measured in ${}^3$He+Au collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV up to 20 GeV/$c$ in the RHIC Year-2014 run. The nuclear modification factor $R_{\mathrm{AA}}$ was measured and compared with that from $d$+Au collisions. The integrated $R_{\mathrm{AA}}$ as a function of $N_{\mathrm{part}}$ was calculated for $d$+Au, ${}^3$He+Au and Au+Au collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV, and found to converge for $N_{\mathrm{part}}>$12, while a clear system ordering $R_{\mathrm{dAu}}$$>$$R_{\mathrm{HeAu}}$$>$$R_{\mathrm{AuAu}}$ was observed for $N_{\mathrm{part}}<$12. The fractional momentum loss for the most central ${}^3$He+Au collisions was also estimated.

Comments: 4 pages, 8 figures, Proceedings for the HardProbe2016 conference, on Sep 22-27, in Wuhan, China