Modification of jet-like correlations in Pb–Au collisions at 158A

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• 作者：CERES Collaboration ; D. Adamová ; G. Agakichiev ; D. Antoń ; czyk ; H. Appelshä ; user ; V. Belaga ; J. Bielč ; í ; ková ; P. Braun-Munzinger ; O. Busch ; A. Cherlin ; S. Damjanović
• 刊名：Physics Letters B
• 出版年：2009
• 出版时间：20 July 2009
• 年：2009
• 卷：678
• 期：3
• 页码：259-263
• 全文大小：367 K

文摘

Results of a two-particle correlation analysis of high-p_t charged particles in Pb–Au collisions at 158A GeV/c are presented. The data have been recorded by the CERES experiment at the CERN-SPS. The correlations are studied as function of transverse momentum, particle charge and collision centrality. We observe a jet-like structure in the vicinity of a high-p_t trigger particle and a broad back-to-back distribution. The yields of associated particles per trigger show a strong dependence on the trigger/associate charge combination. A comparison to PYTHIA confirms the jet-like pattern at the near-side but suggests a strong modification at the away-side, implying significant energy transfer of the hard-scattered parton to the medium.