论文标题
喷气破碎化因子
Nuclear modification factors for jet fragmentation
论文作者
论文摘要
使用最近开发的扰动 - QCD方法在致密的夸克 - 杜松等离子体中使用射流进化，我们研究了射流碎片化功能的核修饰因子。我们发现的定性行为与LHC处的Pb+Pb碰撞中的各自的实验观察一致：光谱两端的明显核增强。我们的蒙特卡洛模拟补充了分析估计值，这些估计阐明了结果的物理解释。理论不确定性的主要来源是我们计算对模拟隔离的低摩梅特临界值的敏感性。为了降低这种敏感性，我们提出了一个新的可观察到的可观察到的，它描述了喷气片段化为征片，并通过构造是红外和共线的。我们提出了蒙特卡洛对相关核修饰因子的预测以及其物理解释。
Using a recently-developed perturbative-QCD approach for jet evolution in a dense quark-gluon plasma, we study the nuclear modification factor for the jet fragmentation function. The qualitative behaviour that we find is in agreement with the respective experimental observations in Pb+Pb collisions at the LHC: a pronounced nuclear enhancement at both ends of the spectrum. Our Monte Carlo simulations are supplemented with analytic estimates which clarify the physical interpretation of the results. The main source of theoretical uncertainty is the sensitivity of our calculations to a low-momentum cutoff which mimics confinement. To reduce this sensitivity, we propose a new observable, which describes the jet fragmentation into subjets and is infrared-and-collinear safe by construction. We present Monte Carlo predictions for the associated nuclear modification factor together with their physical interpretation.
