标题： 喷流产生中的福克斯-沃尔夫拉姆矩 显示英文标题

标题： The Fox-Wolfram Moment of Jet Production in Relativistic Heavy Ion Collisions

摘要： 我们首次对相对论重离子碰撞中多喷注产生的Fox-Wolfram矩（FWMs）进行了理论研究。 在本工作中，p+p碰撞中的喷注产生是通过蒙特卡洛事件生成器SHERPA计算的，而线性玻尔兹曼传输模型被用来模拟高能部分子在热密QCD物质中的多次散射。 计算了p+p和Pb+Pb碰撞中低阶FWM，$H_1^T$的事件归一化分布。 发现对于喷注数为$n_\text{jet} = 2$的事件，与p+p相比，Pb+Pb中的$H_1^T$分布在小$H_1^T$区域被抑制，而在大$H_1^T$区域被增强。 对于具有$n_\text{jet}>2$的事件，QGP 中由于喷注淬火导致的喷注数减少效应会降低 Pb+Pb 相对于 p+p 的$H_1^T$分布在大$H_1^T$处的值。 介质对具有$n_\text{jet}\ge 2$的事件的 Fox-Wolfram 矩$H_1^T$的修改也进行了展示，这与具有$n_\text{jet} = 2$的事件类似。 其原因是通过不同末态喷注数事件对$H_1^T$的相对贡献比例揭示的。 显示英文摘要

摘要： We present the first theoretical investigation of Fox-Wolfram moments (FWMs) for multi-jet production in relativistic heavy ion collisions. In this work, jet productions in p+p collisions are computed with a Monte Carlo event generator SHERPA, while the Linear Boltzmann Transport model is utilized to simulate the multiple scattering of energetic partons in the hot and dense QCD matter. The event-normalized distributions of the lower-order FWM, $H_1^T$ in p+p and Pb+Pb collisions are calculated. It is found that for events with jet number $n_\text{jet} = 2$ the $H_1^T$ distribution in Pb+Pb is suppressed at small $H_1^T$ while enhanced at large $H_1^T$ region as compared to p+p. For events with $n_\text{jet}>2$, the jet number reduction effect due to jet quenching in the QGP decreases the $H_1^T$ distribution at large $H_1^T$ in Pb+Pb relative to p+p. The medium modification of the Fox-Wolfram moment $H_1^T$ for events with $n_\text{jet}\ge 2$ are also presented, which resemble those of events with $n_\text{jet} = 2$. Its reason is revealed through the relative contribution fractions of events with different final-state jet numbers to $H_1^T$.