"Extra Figure u8cp[f326]" of "Study of quark and gluon jet substructure in Z+jet and dijet events from pp collisions"

Measurements of jet substructure describing the composition of quark- and gluon-initiated jets are presented. Proton-proton (pp) collision data at sqrt(s)=13 TeV collected with the CMS detector are used, corresponding to an integrated luminosity of 35.9/fb. Generalized angularities are measured that characterize the jet substructure and distinguish quark- and gluon-initiated jets. These observables are sensitive to the distributions of transverse momenta and angular distances within a jet. The analysis is performed using a data sample of dijet events enriched in gluon-initiated jets, and, for the first time, a Z+jet event sample enriched in quark-initiated jets. The observables are measured in bins of jet transverse momentum, and as a function of the jet radius parameter. Each measurement is repeated applying a "soft drop" grooming procedure that removes soft and large angle radiation from the jet.For easier navigation, figures are named with a code with each letter/number representing in the following order: ungroomed/groomed, AK4/AK8, charged, multiplicity/pTD2/thrust/width/LHA, [central dijet/forward dijet/Z+jet, PT].

本研究报道了针对夸克初始喷注与胶子初始喷注组成的喷注子结构测量结果。实验采用CMS探测器采集的质心系能量√s=13 TeV的质子-质子（pp）碰撞数据，对应积分亮度为35.9 fb⁻¹。我们测量了广义角距（generalized angularities），该可观测量可表征喷注子结构并区分夸克初始喷注与胶子初始喷注。此类可观测量对喷注内部的横向动量分布与角间距具有敏感性。分析使用了富含胶子初始喷注的双喷注事件样本，并首次采用了富含夸克初始喷注的Z+喷注事件样本。我们按喷注横向动量的分箱形式开展测量，并将结果作为喷注半径参数的函数呈现。每一项测量均通过施加‘软降（soft drop）’修整程序完成，该程序可去除喷注内的软辐射与大角度辐射。为便于查阅，图表采用编码命名，各字母与数字的依次含义为：未修整/已修整、AK4/AK8、带电粒子、多重数/pTD2/推力/宽度/LHA、[中心区双喷注/前向区双喷注/Z+喷注、PT]。