用累积量进行流动分析：直接计算
Flow analysis with cumulants: direct calculations
摘要：
重离子碰撞中的各向异性流测量提供了关于热的和致密的物质的性质的重要信息。这些测量是基于方位角相关性的分析，并且可能被来自与初始几何形状无关的相关性（所谓的非流动）的贡献所偏置。为了改善各向异性流动测量，已经开发了基于多粒子相关（累积量）的先进方法来抑制非流动贡献。这些多粒子相关性可以通过循环所有可能的多重态来计算，但是这很快就会变得CPU密集。因此，最常用的累积量计算技术是基于生成函数。这种方法涉及近似，并有其自身的偏见，这使得结果的解释复杂化。本文提出了一种利用流矢矩直接计算多粒子累积量的精确方法。
英文摘要：
Anisotropic flow measurements in heavy-ion collisions provide important information on the properties of hot and dense matter. These measurements are based on analysis of azimuthal correlations and might be biased by contributions from correlations that are not related to the initial geometry, so called non-flow. To improve anisotropic flow measurements advanced methods based on multi-particle correlations (cumulants) have been developed to suppress non-flow contribution. These multi-particle correlations can be calculated by looping over all possible multiplets, however this quickly becomes prohibitively CPU intensive. Therefore, the most used technique for cumulant calculations is based on generating functions. This method involves approximations, and has its own biases, which complicates the interpretation of the results. In this paper we present a new exact method for direct calculations of multi-particle cumulants using moments of the flow vectors.
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