相对论性重离子碰撞中双强子关联的产额与方位角形状修正趋势
核实验
2019-08-13 v2
摘要
由硬散射产生并嵌入大原子核碰撞中的快速部分子探针表明，部分子会遭受巨大的能量损失，且产生的介质可能对损失的能量产生集体响应。我们测量了在sqrt(s_NN) = 200 GeV的Au+Au和p+p碰撞中，中心快度区横动量p^t_T = 4-12 GeV/c的中性π触发粒子与关联带电强子（p^a_T = 0.5-7 GeV/c）作为相对方位角Delta Phi的函数。这些数据带来了两个主要发现。首先，低动量强子的相对角分布（其形状修正曾被解释为介质对部分子能量损失的响应）仅在p^t_T < 7 GeV/c时发生修正。在更高p^t_T下，即使对于测量的最低p^a_T，数据也与未修正或极弱修正的形状一致。这一观测对介质响应情景提出了定量挑战。其次，在Au+Au中相对于p+p中触发粒子对侧的关联产额（I_AA）在大动量下受到抑制（IAA ~ 0.35-0.5），但抑制程度小于单粒子核修正因子（R_AA ~0.2）。
引用
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journal= {arXiv preprint arXiv:1002.1077},
year = {2019}
}
备注
427 authors, 6 pages text, 3 figures, 1 table. Submitted to Phys. Rev. Lett. v2 has minor changes in response to PRL referee comments. Plain text data tables for the points plotted in figures are publicly available at http://www.phenix.bnl.gov/papers.html