Effects of hydrodynamic and initial longitudinal fluctuations on rapidity decorrelation of collective flow
Effects of hydrodynamic and initial longitudinal fluctuations on rapidity decorrelation of collective flow
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DOI：
10.1016/j.physletb.2022.137053
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发表时间：
2021-11
影响因子：
4.4
通讯作者：
A. Sakai;K. Murase;Tetsufumi Hirano
中科院分区：
文献类型：
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作者：
A. Sakai;K. Murase;Tetsufumi Hirano
研究了高能核碰撞中流体动力学涨落和初始纵向涨落对集体流快度去相关的影响。我们使用一个（3 + 1）维的综合动力学模型，在这个模型中，我们将联合收割机初始条件与纵向涨落、涨落流体力学和强子级联结合起来。我们分析了在纵向的因式分解比研究这些波动的快度去相关的效果。我们发现的流体动力学波动和初始纵向波动的影响之间的一个本质区别的中心依赖的因子分解比。流体动力学波动和初始纵向波动的组合导致二阶因子分解比r 2（η p a，η p B）的中心依赖性的再现，由CMS协作测量。我们的模型还定性地描述了三阶因子分解比r3（η p a，η p B）的中心依赖性。这些结果表明，流体动力学涨落，以及初始的纵向波动，在理解高能核碰撞反应的纵向动力学的重要性。
We investigate the interplay between hydrodynamic fluctuations and initial longitudinal fluctuations for their effects on the rapidity decorrelation of collective flow in high-energy nuclear collisions. We use a (3+ 1)-dimensional integrated dynamical model in which we combine initial conditions with longitudinal fluctuations, fluctuating hydrodynamics and hadronic cascades. We analyse the factorisation ratio in the longitudinal direction to study the effect of these fluctuations on the rapidity decorrelation. We find an essential difference between the effects of the hydrodynamic fluctuations and the initial longitudinal fluctuations in the centrality dependence of the factorisation ratios. A combination of the hydrodynamic fluctuations and the initial longitudinal fluctuations leads to reproduction of the centrality dependence of the second-order factorisation ratio, r 2 (η p a, η p b), measured by the CMS Collaboration. Our model also qualitatively describes the centrality dependence of the third-order factorisation ratio, r 3 (η p a, η p b). These results demonstrate the importance of the hydrodynamic fluctuations, as well as the initial longitudinal fluctuations, in understanding the longitudinal dynamics of high-energy nuclear collision reactions.