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用ATLAS探测器测量在$\sqrt{s_{NN}}$ =2.76 TeV的铅-铅碰撞中不同阶次的流动谐波之间的相关性

Measurement of the correlation between flow harmonics of different order in lead-lead collisions at $\sqrt{s_{NN}}$=2.76 TeV with the ATLAS detector

ATLAS Collaboration

备注：
22 pages plus author list + cover pages (35 pages total), 16 figures, submitted to Phys. Rev. C., All figures including auxiliary figures can be found at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2014-03/
发表信息：
Phys. Rev. C 92, 034903 (2015)
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摘要：

椭圆形或三角形流动系数$v_m$（$m$ =2或3）和其他流动谐波$v_n$（$n$ =2至5）之间的相关性是使用2010年由ATLAS实验在LHC收集的$\sqrt{s_{NN}}=2.76$ TeV Pb+Pb碰撞数据测量的，对应于7 $μ$ b $^{-1}$的积分亮度。$v_m$ - $v_n$关联在中快度中作为中心性的函数进行测量，对于同一中心性间隔内的事件，作为事件椭圆度或三角形定义在向前快度区域的函数进行测量。对于同一中心性区间内的事件，发现$v_3$与$v_2$之间存在显著的正相关关系，这种正相关关系与相应的偏心率$ε_2$和$ε_3$之间类似的正相关关系是一致的。另一方面，观察到$v_4$随$v_2$强烈增加，$v_5$随$v_2$和$v_3$强烈增加。发现$n$ =4和5的$v_m$ - $v_n$相关性的趋势和强度与初始几何模型预测的$ε_m$ - $ε_n$相关性不一致。相反，这些相关性被发现是一致的线性贡献$v_n$和一个非线性项，这是一个功能的$v_2^2$或$v_2v_3$，流体动力学模型预测的组合效果。一个简单的两个组件的配合是用来分开这两个贡献。提取的线性和非线性贡献$v_4$和$v_5$被发现是一致的与先前测量的事件平面相关性。

英文摘要：

Correlations between the elliptic or triangular flow coefficients $v_m$ ($m$=2 or 3) and other flow harmonics $v_n$ ($n$=2 to 5) are measured using $\sqrt{s_{NN}}=2.76$ TeV Pb+Pb collision data collected in 2010 by the ATLAS experiment at the LHC, corresponding to an integrated lumonisity of 7 $μ$b$^{-1}$. The $v_m$-$v_n$ correlations are measured in midrapidity as a function of centrality, and, for events within the same centrality interval, as a function of event ellipticity or triangularity defined in a forward rapidity region. For events within the same centrality interval, $v_3$ is found to be anticorrelated with $v_2$ and this anticorrelation is consistent with similar anticorrelations between the corresponding eccentricities $ε_2$ and $ε_3$. On the other hand, it is observed that $v_4$ increases strongly with $v_2$, and $v_5$ increases strongly with both $v_2$ and $v_3$. The trend and strength of the $v_m$-$v_n$ correlations for $n$=4 and 5 are found to disagree with $ε_m$-$ε_n$ correlations predicted by initial-geometry models. Instead, these correlations are found to be consistent with the combined effects of a linear contribution to $v_n$ and a nonlinear term that is a function of $v_2^2$ or of $v_2v_3$, as predicted by hydrodynamic models. A simple two-component fit is used to separate these two contributions. The extracted linear and nonlinear contributions to $v_4$ and $v_5$ are found to be consistent with previously measured event-plane correlations.

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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