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arXiv 0704.0220nucl-ex
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由STAR得到的三个粒子关联

Three Particle Correlations from STAR

Jason Glyndwr Ulery

摘要:

相对于$pp$、d+Au和外围Au+Au碰撞,两粒子关联显示了对中心Au+Au碰撞远离侧形状的修改。不同的方案可以解释这种修改,包括:大角度胶子辐射,射流偏转的横向流动,路径长度依赖的能量损失,切伦科夫胶子辐射的快速移动的粒子,和锥形流产生的流体动力学马赫锥激波。三粒子关联具有区分锥形辐射、锥形流和切伦科夫辐射的能力。此外,所观察到的形状对相关粒子的$p_T$的依赖性可以用来区分锥形发射从音爆(马赫锥)和QCD-切伦科夫辐射。我们目前的结果,从星3粒子的方位角相关的高$p_T$触发粒子与两个较软的粒子。结果显示$pp$,d+金和高统计金+金碰撞在$\sqrt{s_{NN}}$ =200 GeV。分析的一个重要方面是组合背景的减法。系统的不确定性,由于这种减法和流量谐波V2和V4的详细研究。从马赫锥的锥形流的存在或不存在的结果的影响进行了讨论。

英文摘要:

Two-particle correlations have shown modification to the away-side shape in central Au+Au collisions relative to $pp$, d+Au and peripheral Au+Au collisions. Different scenarios can explain this modification including: large angle gluon radiation, jets deflected by transverse flow, path length dependent energy loss, Cerenkov gluon radiation of fast moving particles, and conical flow generated by hydrodynamic Mach-cone shock-waves. Three-particle correlations have the power to distinguish the scenarios with conical emission, conical flow and Cerenkov radiation, from other scenarios. In addition, the dependence of the observed shapes on the $p_T$ of the associated particles can be used to distinguish conical emission from a sonic boom (Mach-cone) and from QCD-Cerenkov radiation. We present results from STAR on 3-particle azimuthal correlations for a high $p_T$ trigger particle with two softer particles. Results are shown for $pp$, d+Au and high statistics Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV. An important aspect of the analysis is the subtraction of combinatorial backgrounds. Systematic uncertainties due to this subtraction and the flow harmonics v2 and v4 are investigated in detail. The implications of the results for the presence or absence of conical flow from Mach-cones are discussed.

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