High- [formula omitted][formula omitted], η, identified and inclusive charged hadron spectra from PHENIX

Abstract

PHENIX has extended the measurement of the π 0 , η , identified and inclusive charged hadrons up to 20 GeV/c, and extended the measurement to the Cu+Cu collision system. A strong suppression is observed for both π 0 and charged hadron yields in central Au+Au and Cu+Cu collisions. Both in the Au+Au and Cu+Cu systems R A A becomes independent of p T above 5 GeV/c. Its centrality dependence is compared to two models in order to test for universal N part scaling that is independent of system; results are inconclusive. The results are compatible with energy loss predictions. In addition, the ratio of η to π 0 approaches, within uncertainties, a constant value of 0.4 ∼ 0.5 at high p T in p + p , d + Au , and Au+Au, while the ratio of K s to π 0 is also consistent with a constant value at high p T in d + Au and p + p . These results are compatible with normal jet fragmentation.