High p_T identified hadron ratios in sqrt(s_NN)=200GeV Au+Au Collisions

The PHENIX detector at RHIC measured high p_T identified hadron ratios in sqrt(s_NN) = 200GeV Au+Au collisions. Within the current systematic and statistical errors, pbar/p ratios that are measured up to 3.8GeV/c are almost independent of both p_T and centrality. The baryon to meson ratio is measured through p/pi and pbar/pi ratios up to 3.8GeV/c, showing they are strongly centrality dependent.