arXiv 2009.033162020-09-07hep-phnucl-th

解缠射流改性

Disentangling Jet Modification

Jasmine Brewer, Quinn Brodsky, Krishna Rajagopal

备注：: 4 pages; 3 figures; proceedings of Hard Probes 2020

摘要：

重离子碰撞中的喷流修正是对碰撞中产生的夸克-胶子等离子体（QGP）的性质和结构的重要探索，同时也编码了关于喷流在QGP液滴中激发的尾流如何形成和弛豫的信息。然而，在实验中，人们无法知道重离子碰撞中的特定喷流在没有淬火的情况下会是什么样子，这使得很难解释单个喷流修改的测量结果。本Monte Carlo研究的目标是深入了解使用的混合强/弱耦合模型作为测试床的射流淬火的射流可观的修改。在这个蒙特卡罗研究中（但不是在实验中），可以观察到$\textit{the same jet}$在真空或QGP中的演化。我们使用这种能力来解开修改的影响，在重离子碰撞与不同的选择偏置对两个观测值的分布的影响：分数能量损失和修饰$ΔR$。我们发现，在混合模型中，梳理$ΔR$的分布似乎是未修改的样品淬火后选择的射流，在重离子碰撞，并确认，这种缺乏修改，因为选择偏向喷流，只失去了一小部分的能量。相反，如果我们选择射流的方式，避免这种偏见，然后按照这些选定的射流，因为他们是淬火，我们表明，事实上，有一个重大的修改的$ΔR$个别射流。我们表明，这种喷气修改主要是由于纳入粒子来自尾流的部分子簇激发等离子体作为一个组成部分，什么样的实验重建作为一个射流。我们讨论的影响是巨大的幅度，这表明我们的定性结论是更普遍的比蒙特卡洛研究，我们得到他们。

英文摘要：

Jet modification in heavy-ion collisions is an important probe of the nature and structure of the quark-gluon plasma (QGP) produced in these collisions and also encodes information about how the wakes that jets excite in a droplet of QGP form and relax. However, in experiment, one cannot know what a particular jet in a heavy ion collision would have looked like without quenching, making it difficult to interpret measurements in terms of individual jet modification. The goal of this Monte Carlo study is to gain insight into the modification of jet observables using the hybrid strong/weak coupling model of jet quenching as a test bed. In this Monte Carlo study (but not in experiment) it is possible to watch $\textit{the same jet}$ as it evolves in vacuum or in QGP. We use this ability to disentangle the effects of modification of individual jets in heavy ion collisions vs. the effects of differing selection bias on the distribution of two observables: fractional energy loss and groomed $ΔR$. We find that in the hybrid model the distribution of groomed $ΔR$ appears to be unmodified in a sample of jets selected after quenching, as in heavy ion collisions, and confirm that this lack of modification arises because of a selection bias toward jets that lose only a small fraction of their energy. If instead we select jets in a way that avoids this bias, and then follow these selected jets as they are quenched, we show that there is, in fact, a substantial modification of the $ΔR$ of individual jets. We show that this jet modification is principally due to the incorporation of particles coming from the wake that the parton shower excites in the plasma as a component of what an experimentalist reconstructs as a jet. The effects we discuss are substantial in magnitude, suggesting that our qualitative conclusions are more general than the Monte Carlo study in which we obtain them.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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