The suppression of the inclusive yield and the large azimuthal anisotropy of high pT hadrons observed in nuclear collisions at RHIC may be related to partonic energy loss in matter, thereby supplying a direct probe of the density of the medium. At QM2002 the STAR Collaboration presented new data from the 200 GeV Au+Au and p+p runs, extending the analysis of inclusive suppression and anisotropy well into the perturbative regime. Two-particle correlations at high pT show direct evidence of jet fragmentation and indicate a strong suppression of back-to-back hadron pairs in the most central nuclear collisions. I will discuss the new STAR data and a plausible picture of high pT hadron production in nuclear collisions that emerges from them.
Organiser(s): Yiota Foka, Guy Paic and Urs Wiedemann / EP Division