Centrality dependence of charged hadron and strange hadron elliptic flow from root s(NN)=200 GeVAu+Au collisions
Centrality dependence of charged hadron and strange hadron elliptic flow from root s(NN)=200 GeVAu+Au collisions
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DOI：
10.1103/physrevc.77.054901
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发表时间：
2008-01
影响因子：
3.1
通讯作者：
S. C. B. Abelev;E. al.
中科院分区：
文献类型：
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作者：
S. C. B. Abelev;E. al.
我们给出了在BNL相对论重离子对撞机（RHIC）上，根s(NN) = 200gev Au+Au碰撞中带电强子、奇异粒子和多奇异粒子的椭圆流upsilon(2)的STAR结果。详细研究了upsilon(2)在宽横向动量范围内的中心性依赖性。为了估计系统不确定度，对不同的分析方法进行了比较。为了讨论非流动效应，我们用K(S)(0)和a的Lee-Yang零法对upsilon(2)进行了首次分析。在相对较低的PT区域，P(T) <= 2 GeV/c，在研究的每个中心性仓中，对已识别的强子观察到m(T) - m的标度。然而，我们没有观察到由参与者偏心率缩放的nu 2（p(T)）与中心性无关。在较高PT下，2 1 <= PT <= 6 GeV/c，所有强子的夸克数均为V2尺度。对于没有明显强子相互作用的多奇异强子Omega， upsilon(2)的值与低p(T)时的m(T) - m标度和中间p(T)时的夸克数标度一致。作为碰撞中心性的函数，观察到p(T)积分upsilon(2)随参与者偏心率的增加，表明在更中心的Au+Au碰撞中有更强的集体流。
We present STAR results on the elliptic flow upsilon(2) Of charged hadrons, strange and multistrange particles from,root s(NN) = 200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of upsilon(2) over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis Of upsilon(2) with the Lee-Yang zero method for K(S)(0) and A. In the relatively low PT region, P(T) <= 2 GeV/c, a scaling with m(T) - m is observed for identified hadrons in each centrality bin studied. However, we do not observe nu 2(p(T))) scaled by the participant eccentricity to be independent of centrality. At higher PT, 2 1 <= PT <= 6 GeV/c, V2 scales with quark number for all hadrons studied. For the multistrange hadron Omega, which does not suffer appreciable hadronic interactions, the values of upsilon(2) are consistent with both m(T) - m scaling at low p(T) and number-of-quark scaling at intermediate p(T). As a function ofcollision centrality, an increase of p(T)-integrated upsilon(2) scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.