"Extra Figure g4cm[f150]" 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].

本研究报道了用于表征夸克引发喷注与胶子引发喷注组成的喷注子结构（jet substructure）测量结果。分析使用了由CMS探测器（CMS detector）在质心系能量√s=13 TeV下采集的质子-质子（pp）碰撞数据，对应的积分亮度为35.9 fb⁻¹。本次测量采用广义角距（generalized angularities）可观测量来表征喷注子结构，并实现夸克引发与胶子引发喷注的区分。这些可观测量对喷注内部的横向动量分布与角距离分布具有显著敏感性。本次分析采用了两类事件样本：一类是富含胶子引发喷注的双喷注（dijet）事件样本，另一类是首次使用的富含夸克引发喷注的Z+喷注（Z+jet）事件样本。上述可观测量按照喷注横向动量（PT）的分箱进行测量，并以喷注半径参数为函数进行标定。每一项测量均重复应用了“软滴（soft drop）”修整程序，该程序可去除喷注内的软辐射与大角度辐射成分。为便于查阅，图表采用编码规则命名，每个字母/数字依次代表以下类别：未修整/已修整，AK4/AK8喷注，带电粒子，多重数/pTD2/推力/宽度/LHA，[中心区双喷注/向前区双喷注/Z+喷注，横向动量（PT）]。