Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-10-06
Physics
Nuclear Physics
Nuclear Experiment
8 pages, 9 figures. Proceedings for "XXXV International Symposium on Multiparticle Dynamics 2005", replace the figures and fix
Scientific paper
10.1063/1.2197420
High $p_T$ jets are known to be strongly modified by the dense, strongly interacting medium created in heavy-ion collisions. The jet signal, extracted from two particle $\Delta\phi$ correlation, shows a systematic evolution of these modifications as function of $p_T$ and centrality. At intermediate $p_T$, both near side and away side correlations are modified. But the modifications are much stronger at the away side, resulting in a characteristic cone type of structure in central Au + Au collisions. The robustness of cone structure is strengthened by studying the jet shape as function of angle relative to the reaction plane. As one increase the $p_T$ for BOTH hadrons, the cone structure seems to be filled up, and a peak structure appears on the away side. However, the interpretation of these results require careful separation of medium effect and surface bias.
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