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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Flow fluctuations in Pb plus Pb collisions at root s(NN)=5.02 TeV with the ATLAS detector
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Flow fluctuations in Pb plus Pb collisions at root s(NN)=5.02 TeV with the ATLAS detector

机译:PB Plus PB碰撞中的流量波动(NN)= 5.02 TEV与ATLAS检测器

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摘要

Measurements of four-particle cumulants c(n){4} for n = 1, 2, 3, 4 are presented using 470 mu b(-1) of Pb+Pb collisions at root s(NN) = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of single harmonics p(v(n)). For the first time, a negative c(1){4} is observed. The c(4){4} is found to be negative in central collisions but changes sign around 20-25% centrality. This behavior is consistent with a nonlinear contribution to v(4) that is proportional to v(2)(2). c(2){4} and c(3){4} are calculated using two reference event classes in order to investigate the influence of volume fluctuations. Over most of the centrality range, c(2){4} and c(3){4} are found to be negative, while in the ultra-central collisions, c(2){4} changes sign and becomes positive, suggesting a deviation from Gaussian behavior in the event-by-event fluctuation of v(2). The magnitudes of the sign change are also found to be dependent of the event class definition .
机译:使用Root s(nn)= 5.02 tev的470μmb(-1)的470μb(-1)呈N = 1,2,3,4的四种粒子累积剂C(n){4}的测量结果用ATLAS LHC的探测器。这些累积剂提供有关单次谐波P的逐步波动的信息(V(n))。首次,观察到负C(1){4}。 C(4){4}被发现在中央碰撞中为负,但变化符号约为20-25%的中心。这种行为与与V(2)(2)成比例的V(4)的非线性贡献一致。 C(2){4}和C(3){4}使用两个参考事件类进行计算,以调查体积波动的影响。在大多数中心范围内,C(2){4}和C(3){4}被发现为负,而在超中央碰撞中,C(2){4}变化标志并变为积极,提示在v(2)的逐个事件波动中的高斯行为偏离。符号变更的大小也被发现依赖于事件类定义。

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