论文标题
横向动量波动及其与核冲突中椭圆流的相关性
Transverse momentum fluctuations and their correlation with elliptic flow in nuclear collision
论文作者
论文摘要
我们建议可观察到的$ v_0 $和$ v_0（p_t）$，以量化固定多重性的总横向动量中的相对波动。我们首先研究了固定多样性动量依赖性两个粒子相关函数的分解为$ v_0（p_t^a）$和$ v_0（p_t^b）$在逼真的流体动力模拟中。然后，我们为不同粒子类型的$ v_0（p_t）$介绍计算。我们确定了集成的$ V_0 $与先前测量的可观察结果之间的关系，并将基于混合流体动力学的模型与实验数据进行比较。量化了散装粘度和初始平衡阶段对结果的影响。我们发现$ v_0 $与每个椭圆面积的初始状态熵密切相关，$ s/a $。使用此结果，我们解释了椭圆流与横向动量（在模拟和实验中）之间观察到的相关性如何反映出$ 1/a $和椭圆度$ \ varepsilon_2 $在固定多重性上的初始状态相关性。我们认为，$ v_0 $的系统实验研究与其他$ v_n $相同的复杂性，可以极大地理解我们对Quark Gluon等离子体属性的理解。
We propose observables $v_0$ and $v_0(p_T)$ which quantify the relative fluctuations in the total transverse momentum at fixed multiplicity. We first study the factorization of the fixed multiplicity momentum dependent two particle correlation function into a product of $v_0(p_T^a)$ and $v_0(p_T^b)$ within realistic hydrodynamic simulations. Then we present computations of $v_0(p_T)$ for different particle types. We determine the relation between the integrated $v_0$ and previously measured observables, and compare results from a hybrid hydrodynamics based model to experimental data. The effects of bulk viscosity and an initial pre-equilibrium stage on the results are quantified. We find that $v_0$ is strongly correlated with the initial state entropy per elliptic area, $S/A$. Using this result, we explain how the observed correlations between the elliptic flow and the transverse momentum (both in simulations and experiment) reflect the initial state correlations between $1/A$ and ellipticity $\varepsilon_2$ at fixed multiplicity. We argue that the systematic experimental study of $v_0$, with the same sophistication as used for the other $v_n$, can contribute significantly to our understanding of quark gluon plasma properties.
