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arXiv 0905.1070nucl-ex
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sqrt(s_NN)= 200 GeV Au + Au碰撞椭圆流测量的系统研究

Systematic Studies of Elliptic Flow Measurements in Au+Au Collisions at sqrt(s_NN) = 200 GeV

PHENIX Collaboration, A. Afanasiev

摘要:

本文给出了在赝快度范围内测量的包含荷电强子椭圆流v_2| η| <0.35在金+金碰撞在sqrt(s_NN)= 200 GeV。在宽的横动量(p_T = 0.2 - 8.0GeV/c)和中心度(0 - 60%)范围内给出了v_2的计算结果。为了研究与反应面无关的非流动效应以及v_2的涨落,我们比较了两种不同的分析方法:(1)前向两个独立子探测器的事件面法(|η| 3.1 - 3.9)和梁(|η|> 6.5)赝快度和(2)利用中快度探测粒子间的相关性提取的双粒子累积量方法。两个事件平面的结果在系统不确定度范围内,在p_T和中心度0 - 40%内是一致的。在40 - 60%的周边碰撞中,两种事件平面方法的v_2最多相差20%。讨论了两粒子累积量结果与标准事件平面测量结果的比较。

英文摘要:

We present inclusive charged hadron elliptic flow v_2 measured over the pseudorapidity range |η| < 0.35 in Au+Au collisions at sqrt(s_NN) = 200 GeV. Results for v_2 are presented over a broad range of transverse momentum (p_T = 0.2-8.0 GeV/c) and centrality (0-60%). In order to study non-flow effects that are not correlated with the reaction plane, as well as the fluctuations of v_2, we compare two different analysis methods: (1) event plane method from two independent sub-detectors at forward (|η| = 3.1-3.9) and beam (|η| > 6.5) pseudorapidities and (2) two-particle cumulant method extracted using correlations between particles detected at midrapidity. The two event-plane results are consistent within systematic uncertainties over the measured p_T and in centrality 0-40%. There is at most 20% difference of the v_2 between the two event plane methods in peripheral (40-60%) collisions. The comparisons between the two-particle cumulant results and the standard event plane measurements are discussed.

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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