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

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 $R_{\mathrm{A}\mathrm{A}}$ was measured and compared with that from $d$+Au collisions. The integrated $R_{\mathrm{A}\mathrm{A}}$ as a function of $N_{\rm part}$wascalculatedfor$d$+Au,$^3$He+AuandAu+Aucollisionsat$\sqrt{s_{{NN}}}$=200GeV,andfoundtoconvergefor$N{\rm part}>$12, while a clear system ordering $R_{\mathrm{d}\mathrm{A}\mathrm{u}}$$>$$R_{\mathrm{H}\mathrm{e}\mathrm{A}\mathrm{u}}$$>$$R_{\mathrm{A}\mathrm{u}\mathrm{A}\mathrm{u}}$ was observed for $N_{\mathrm{p}\mathrm{a}\mathrm{r}\mathrm{t}}<$12. The fractional momentum loss for the most central ${}^3$He+Au collisions was also estimated.