Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2002-10-16
Nucl.Phys. A715 (2003) 199-208
Physics
Nuclear Physics
Nuclear Experiment
10 pages, 11 figures, Talk presented at Quark Matter 2002, Nantes, France, July 18-24, 2002. To appear in the proceedings (Nuc
Scientific paper
10.1016/S0375-9474(02)01428-8
We present recent high transverse momentum measurements by the PHENIX experiment for Au+Au and p+p collisions at $\sqrt{s_{NN}} = 200$ GeV at the Relativistic Heavy Ion Collider (RHIC). We show particle spectra for neutral pions and charged hadrons, define and show the nuclear modification factor, and discuss particle composition. By means of the nuclear modification factor, we observe a suppression factor of 5-6 for neutral pions and 3-4 for charged hadrons in central collisions at high $p_T$. We find that the ratio of $\pi^0$ to $(h^++h^-)/2$ remains nearly constant at $\sim 0.5$ for $p_T = 2-9$ GeV/c. Finally we present strong evidence for the observation of jets in Au+Au collisions.
for the PHENIX Collaboration
Mioduszewski Saskia
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