High-pT π0, η, identified and inclusive charged hadron spectra from PHENIX

PHENIX has extended the measurement of the π0, 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 π0 and charged hadron yields in central Au+Au and Cu+Cu collisions. Both in the Au+Au and Cu+Cu systems RAA becomes independent of pT above 5 GeV/c. Its centrality dependence is compared to two models in order to test for universal Npart scaling that is independent of system; results are inconclusive. The results are compatible with energy loss predictions. In addition, the ratio of η to π0 approaches, within uncertainties, a constant value of 0.4∼0.5 at high pT in p+p, d+Au, and Au+Au, while the ratio of Ks to π0 is also consistent with a constant value at high pT in d+Au and p+p. These results are compatible with normal jet fragmentation.