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Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řežu Prahy, Czech Republic.
Phys Rev Lett. 2016 Oct 28;117(18):182301. doi: 10.1103/PhysRevLett.117.182301.
We report the measurements of correlations between event-by-event fluctuations of amplitudes of anisotropic flow harmonics in nucleus-nucleus collisions, obtained for the first time using a new analysis method based on multiparticle cumulants in mixed harmonics. This novel method is robust against systematic biases originating from nonflow effects and by construction any dependence on symmetry planes is eliminated. We demonstrate that correlations of flow harmonics exhibit a better sensitivity to medium properties than the individual flow harmonics. The new measurements are performed in Pb-Pb collisions at the center-of-mass energy per nucleon pair of sqrt[s_{NN}]=2.76 TeV by the ALICE experiment at the Large Hadron Collider. The centrality dependence of correlation between event-by-event fluctuations of the elliptic v_{2} and quadrangular v_{4} flow harmonics, as well as of anticorrelation between v_{2} and triangular v_{3} flow harmonics are presented. The results cover two different regimes of the initial state configurations: geometry dominated (in midcentral collisions) and fluctuation dominated (in the most central collisions). Comparisons are made to predictions from Monte Carlo Glauber, viscous hydrodynamics, ampt, and hijing models. Together with the existing measurements of the individual flow harmonics the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions.
我们报告了在核-核碰撞中各向异性流谐波振幅的逐事件涨落之间相关性的测量结果,这是首次使用基于混合谐波中多粒子累积量的新分析方法获得的。这种新方法对源自非流效应的系统偏差具有鲁棒性,并且通过构造消除了对对称平面的任何依赖性。我们证明,流谐波的相关性对介质性质的敏感性比单个流谐波更好。这些新测量是在大型强子对撞机上的ALICE实验中,在每核子对质心能量为(\sqrt{s_{NN}} = 2.76) TeV的铅-铅碰撞中进行的。给出了椭圆流(v_2)和四边形流(v_4)谐波的逐事件涨落之间相关性的中心度依赖性,以及(v_2)和三角形流(v_3)谐波之间的反相关性。结果涵盖了初始状态构型的两种不同情况:几何主导(在中中心碰撞中)和涨落主导(在最中心碰撞中)。与蒙特卡罗格劳伯模型、粘性流体动力学模型、ampt模型和hijing模型的预测进行了比较。与现有的单个流谐波测量结果一起,所呈现的结果对重离子碰撞中产生的系统的初始条件和输运性质提供了进一步的限制。