"Extra Figure u8p[f254]" 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引发喷注（quark-initiated jets）与胶子引发喷注（gluon-initiated jets）的组分特征的喷注子结构（jet substructure）测量结果。本分析采用CMS探测器（CMS）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。研究测量了用于表征喷注子结构、并可区分夸克与胶子引发喷注的广义角向度（Generalized angularities）。该类可观测量（observables）对喷注内部的横向动量分布与角间距分布具有敏感响应。本分析分别使用了富含胶子引发喷注的双喷注事件（dijet events）样本，以及首次采用的富含夸克引发喷注的Z+喷注（Z+jet）事件样本。该可观测量以喷注横向动量为分箱维度，并以喷注半径参数（jet radius parameter）作为变量开展测量。每一项测量均在施加"软滴"修整（soft drop grooming）流程的条件下完成，该流程可去除喷注内的软辐射与大角度辐射。为便于检索，所有图表均采用编码命名，每一位字母/数字依次代表以下类别：未修整/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, 横向动量（PT）]。