论文标题
识别重离子碰撞中的修饰喷射分裂
Identifying groomed jet splittings in heavy-ion collisions
论文作者
论文摘要
重型离子碰撞中喷气子结构的测量可能可以为夸克 - 胶子等离子体中的喷气淬火性质提供关键的见解。来自高能物理学的喷气修饰技术已应用于重离子碰撞，以隔离理论上控制的喷气式可观测物，并探索可能修改JET的硬结构。但是，所使用的修饰算法并未针对重型离子碰撞的独特考虑，尤其是在存在大型基础事件的情况下重建喷气机的实验挑战。我们报告了一系列简单的研究，说明了基础事件对重型离子碰撞中的修饰喷射分裂以及相关的修饰喷气式可观察物的影响。我们说明了选择修饰算法的重要性，因为某些美容师对这些影响更强大，而其他美容师（包括重型离子碰撞中通常使用的效果）易受大型背景效应的影响 - 在不受控制的情况下，这种效果可以模仿喷气式淬灭信号。这些实验考虑以及适当的理论动机，为重型离子碰撞中采用的美容算法的选择提供了意见。
Measurements of jet substructure in heavy-ion collisions may provide key insight to the nature of jet quenching in the quark-gluon plasma. Jet grooming techniques from high-energy physics have been applied to heavy-ion collisions in order to isolate theoretically controlled jet observables and explore possible modification to the hard substructure of jets. However, the grooming algorithms used have not been tailored to the unique considerations of heavy-ion collisions, in particular to the experimental challenge of reconstructing jets in the presence of a large underlying event. We report a set of simple studies illustrating the impact of the underlying event on identifying groomed jet splittings in heavy-ion collisions, and on associated groomed jet observables. We illustrate the importance of the selection of grooming algorithm, as certain groomers are more robust to these effects, while others, including those commonly used in heavy-ion collisions, are susceptible to large background effects -- which, when uncontrolled, can mimic a jet quenching signal. These experimental considerations, along with appropriate theoretical motivation, provide input to the choice of grooming algorithms employed in heavy-ion collisions.
