论文标题
重型离子碰撞中数据驱动的夸克和gluon喷气机
Data-driven quark and gluon jet modification in heavy-ion collisions
论文作者
论文摘要
在重离子碰撞中产生的Quark-Gluon等离子体是否对夸克和Gluon发射的喷头进行了不同的修改，这是一个长期存在的问题，到目前为止，它已经避开了确定的实验答案。质子质子和重离子碰撞中夸克 - 格鲁族歧视的关键并发症是，所有测量都必须在喷气样品的（未知）夸克 - 胶状组成上平均。在重型离子的背景下，夸克 - 格鲁隆等离子体对夸克和gluon喷气机的分数和子结构的同时修改进一步掩盖了解释。在这里，我们演示了一种完全数据驱动的方法，该方法使用称为主题建模的统计技术将夸克和gluon贡献分离为喷气式可观察力。假设射流分布是基础“夸克状”和“类似Gluon”分布的混合物，我们展示了如何提取Quark和Gluon Jet射击分数以及成分的多重性分布，这是射流横向动量的函数。这项概念证明的研究基于蒙特卡洛事件发生器珠宝的质子 - 普罗顿和重型离子碰撞事件，其统计数据可在大型强子撞机的运行4中访问。这些结果表明有潜力测定夸克和Gluon射流修饰。
Whether quark- and gluon-initiated jets are modified differently by the quark-gluon plasma produced in heavy-ion collisions is a long-standing question that has thus far eluded a definitive experimental answer. A crucial complication for quark-gluon discrimination in both proton-proton and heavy-ion collisions is that all measurements necessarily average over the (unknown) quark-gluon composition of a jet sample. In the heavy-ion context, the simultaneous modification of both the fractions and substructure of quark and gluon jets by the quark-gluon plasma further obscures the interpretation. Here, we demonstrate a fully data-driven method for separating quark and gluon contributions to jet observables using a statistical technique called topic modeling. Assuming that jet distributions are a mixture of underlying "quark-like" and "gluon-like" distributions, we show how to extract quark and gluon jet fractions and constituent multiplicity distributions as a function of the jet transverse momentum. This proof-of-concept study is based on proton-proton and heavy-ion collision events from the Monte Carlo event generator Jewel with statistics accessible in Run 4 of the Large Hadron Collider. These results suggest the potential for an experimental determination of quark and gluon jet modifications.
