High pT identified hadrons in large and small systems measured by PHENIX

Abstract

Abstract The PHENIX experiment at RHIC measured identified hadrons in several collision systems and centrality classes. Measurements were performed in different years and independent decay modes. The mesons show universal high-pT supression in the different collision systems which suggest no dependency on the size of the projectile. Yields of π 0, ɳ, KS , K* and Φ mesons measured in large systems show similar suppression pattern at S N N = 200 GeV for similar numbers of participant nucleons. In the intermediate pT region, between 2 and 5 GeV/c, a significant enhancement of baryon-to-meson ratios compared to those measured in pp collisions is observed. In small systems an ordering (R pA > R dA > R HeA) for the mesons (π 0 and Φ) at mid-pT was observed.