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arXiv 0904.2973nucl-ex
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158 A GeV/c Pb-Au碰撞中类喷注关联的修正

Modification of jet-like correlations in Pb-Au collisions at 158A GeV/c

CERES Collaboration

摘要:

给出了158 $A$ GeV/ $c$的Pb-Au碰撞中高$p_t$带电粒子的两粒子关联分析结果。这些数据已由CERN-SPS的CERES实验记录。作为函数的横向动量,粒子电荷和碰撞中心的相关性进行了研究。我们观察到在高$p_t$触发粒子附近的射流状结构和宽的背靠背分布。每个触发器的关联粒子的产率显示出强烈的依赖于触发器/关联电荷组合。与PYTHIA的比较证实了在近侧的射流状图案,但建议在远侧的强烈修改,这意味着显着的硬散射部分子的能量转移到介质。

英文摘要:

Results of a two-particle correlation analysis of high-$p_t$ charged particles in Pb-Au collisions at 158$A$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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