论文标题
评估重型离子碰撞流体动力建模中的超中性流量难题
Assessing the ultracentral flow puzzle in hydrodynamic modeling of heavy-ion collisions
论文作者
论文摘要
重型离子碰撞中的一个重大问题是模型无法准确描述超中央实验流数据，尽管这恰恰是最适用流体动力学描述的状态。我们通过计算从多个最近的贝叶斯模型获得的超中央碰撞中的流量来重新评估这个难题的状态，这些碰撞在典型中心的不同碰撞系统中被调整为各种可观察到的。虽然现在可以比以前的计算更好地描述中央数据，但随着超中央碰撞的张力，具有实验性观察的张力仍然存在并且恶化。调整模型参数不能消除此张力而不破坏其他中心的拟合度。因此，重型离子碰撞的标准建模可能需要新的元素。
An outstanding problem in heavy-ion collisions is the inability for models to accurately describe ultra-central experimental flow data, despite that being precisely the regime where a hydrodynamic description should be most applicable. We reassess the status of this puzzle by computing the flow in ultra-central collisions obtained from multiple recent Bayesian models that were tuned to various observables in different collision systems at typical centralities. While central data can now be described with better accuracy than in previous calculations, tension with experimental observation remains and worsens as one goes to ultra-central collisions. Tuning the model parameters cannot remove this tension without destroying the fit at other centralities. As such, new elements are likely needed in the standard modeling of heavy-ion collisions.
