2.76 TeV与ATLAS的Pb-Pb碰撞中$v_{n}$系数和事件平面关联的测量
Measurement of $v_{n}$ coefficients and event plane correlations in 2.76 TeV Pb-Pb collisions with ATLAS
摘要：
利用ATLAS实验测量了$\sqrt{s_{NN}} = 2.76$ TeV Pb-Pb碰撞中在宽横向动量和中心度范围内的流动谐波$v_1-v_6$。的傅立叶系数的两个粒子的相关性示出因式分解为产品的单粒子$v_n$为$n=2-6$。由于全局动量守恒的影响，$n=1$的因式分解会中断。偶极$v_1$与初始偶极不对称性提取从两个粒子的相关性通过两个组件的配合，占动量守恒。提取的dioplar $v_1$的幅度与$v_3$相当。不同阶次的谐波平面之间的相关性的测量，这给额外的约束在重离子碰撞中产生的介质的初始几何形状和膨胀机制，也被提出。
英文摘要：
Measurements of flow harmonics $v_1-v_6$ are presented in a broad range of transverse momentum and centrality for $\sqrt{s_{NN}} = 2.76$ TeV Pb-Pb collisions with the ATLAS experiment. The fourier coefficients of two-particle correlations are shown to factorize as products of the single particle $v_n$ for $n=2-6$. The factorization breaks for $n=1$ due to effects of global momentum conservation. The dipolar $v_1$ associated with the initial dipole asymmetry is extracted from the two-particle correlations via a two component fit that accounts for momentum conservation. The magnitude of the extracted dioplar $v_1$ is comparable to $v_3$. Measurements of correlations between harmonic planes of different orders, which give additional constraints on the initial geometry and expansion mechanism of the medium produced in the heavy ion collisions, are also presented.
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