"Figure 12" of "In-medium modification of dijets in PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV"

Modifications to the distribution of charged particles with respect to high transverse momentum $(p_{\mathrm{T}})$ jets passing through a quark-gluon plasma are explored using the CMS detector. Back-to-back dijets are analyzed in lead-lead and proton-proton collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV via correlations of charged particles in bins of relative pseudorapidity and angular distance from the leading and subleading jet axes. In comparing the lead-lead and proton-proton collision results, modifications to the charged-particle relative distance distribution and to the momentum distributions around the jet axis are found to depend on the dijet momentum balance $x_{j}$, which is the ratio between the subleading and leading jet $p_{\mathrm{T}}$. For events with $x_{j} \approx 1$, these modifications are observed for both the leading and subleading jets. However, while subleading jets show significant modifications for events with a larger dijet momentum imbalance, much smaller modifications are found for the leading jets in these events.

本研究利用CMS探测器，探究了穿过夸克胶子等离子体（quark-gluon plasma）的高横动量$(p_T)$喷注所对应的带电粒子分布的修正效应。针对质心系核子-核子对撞能量$sqrt{s_{NN}}=5.02$太电子伏特下的铅核-铅核与质子-质子对撞中的背对背双喷注，本研究通过相对赝快度分箱内的带电粒子关联，以及相对于领头喷注、次领头喷注轴线的角距离关联开展分析。对比两类对撞的实验结果可知，带电粒子相对距离分布与喷注轴线附近动量分布的修正效应，依赖于双喷注动量平衡量$x_j$——即次领头喷注与领头喷注的横动量之比。对于$x_japprox1$的对撞事件，领头喷注与次领头喷注均观测到此类分布修正。然而，当双喷注动量失衡程度更高时，次领头喷注会呈现显著的修正效应，而此类事件中的领头喷注仅表现出极微弱的分布修正。

搜集汇总

背景与挑战

背景概述

该数据集来自CMS实验，研究了在√s_NN=5.02 TeV的铅铅碰撞中双喷注在介质内的修正，重点关注双喷注动量平衡xj的分布。数据包括不同中心性区间下，重建xj与生成级xj之间的概率矩阵，用于分析喷注修正对动量平衡的依赖性。