Effects of triangular flow on di-hadron azimuthal correlations in relativistic heavy ion collisions
Effects of triangular flow on di-hadron azimuthal correlations in relativistic heavy ion collisions
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DOI：
10.1103/physrevc.83.021903
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发表时间：
2010-11
影响因子：
3.1
通讯作者：
Jun Xu;C. Ko
中科院分区：
文献类型：
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作者：
Jun Xu;C. Ko
利用相对论重离子碰撞的AMPT模型，研究了质心能量$\sqrt{{s}_{\mathit{NN}}}=200$ GeV，碰撞参数$b=8$ fm时，发射射流在$\text{Au}+ $ text{Au}$碰撞中引发的双强子方位角关联。在扣除椭圆流的背景相关后，在触发粒子的远离侧得到了伴生粒子的双峰结构。然而，在小（大）三角形流动或初始碰撞几何形状呈三角形的情况下，由于波动的结果，方位角相关性中的近侧峰和远侧双峰都被显著抑制（增强）。在减去三角形流的背景相关性后，远侧双峰变为两侧宽肩的单峰。在进一步减去高阶流之后，二强子相关的远端基本上变成了一个单峰。
Using the AMPT model for relativistic heavy ion collisions, we have studied the di-hadron azimuthal angular correlations triggered by emitted jets in $\text{Au}+\text{Au}$ collisions at center-of-mass energy $\sqrt{{s}_{\mathit{NN}}}=200$ GeV and impact parameter $b=8$ fm. A double-peak structure for the associated particles at the away side of trigger particles is obtained after subtracting background correlations due to the elliptic flow. Both the near-side peak and the away-side double peaks in the azimuthal angular correlations are, however, significantly suppressed (enhanced) in events of small (large) triangular flow or triangularity in the initial collision geometry as a result of fluctuations. After subtraction of background correlations due to the triangular flow, the away-side double peaks change into a single peak with broad shoulders on both sides. The away side of the di-hadron correlations becomes essentially a single peak after further subtraction of higher-order flows.