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arXiv 0907.4741nucl-ex
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$\sqrt{s_{NN}}$ = 200 GeV Au+Au碰撞中识别粒子的前向快度、方位流和径向流

Forward-rapidity azimuthal and radial flow of identified particles for $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions

S. J. Sanders

摘要:

在RHIC的一个强大的方位流签名表明快速系统平衡导致一个几乎完美的流体状态。流动行为的纵向范围取决于这种状态是如何形成的,并且可以通过测量方位角分布的第二傅立叶分量($v_{2}(p_{T})$)的伪快度和横向动量依赖性来研究。我们报告的测量识别粒子$v_{2}$作为$p_{T}$(0.5-2.0 GeV/c),中心性(0- 25%,25-50%)和赝快度($0\leqη<3.2$)的函数$\sqrt{s_{NN}} = 200 \rm GeV$金+金碰撞。BRAHMS谱仪用于粒子识别($π$,K,p)和动量测定,BRAHMS全局探测器用于测定相应的反应平面角。结果进行了讨论,在组分夸克标度的快度依赖性和开发完整的(方位角和径向)流体动力学方面的RHIC的前向动力学模型。

英文摘要:

A strong azimuthal flow signature at RHIC suggests rapid system equilibration leading to an almost perfect fluid state. The longitudinal extent of the flow behavior depends on how this state is formed and can be studied by measuring the pseudorapidity and transverse momentum dependence of the second Fourier component ($v_{2}(p_{T})$) of the azimuthal angular distribution. We report on a measurement of identified-particle $v_{2}$ as a function of $p_{T}$ (0.5-2.0 GeV/c), centrality (0-25%, 25-50%), and pseudorapidity ($0\leqη<3.2$) for $\sqrt{s_{NN}} = 200 \rm GeV$ Au+Au collisions. The BRAHMS spectrometers are used for particle identification ($π$, K, p) and momentum determination and the BRAHMS global detectors are used to determine the corresponding reaction-plane angles. The results are discussed in terms of the rapidity dependence of constituent quark scaling and in terms of models that develop the complete (azimuthal and radial) hydrodynamic aspects of the forward dynamics at RHIC.

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