"Extra Figure u4w[c65]" 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].

本工作报道了描述夸克引发喷注与胶子引发喷注（quark- and gluon-initiated jets）组成的喷注子结构（jet substructure）测量结果。实验采用CMS探测器（CMS detector）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（integrated luminosity）为35.9 fb⁻¹。我们测量了可表征喷注子结构、并区分夸克引发喷注与胶子引发喷注的广义角距（generalized angularities）可观测量。此类可观测量对喷注内部的横向动量（transverse momenta）分布与角距离（angular distances）分布具有敏感性。本分析使用了胶子引发喷注富集的双喷注事件（dijet events）样本，并首次采用了夸克引发喷注富集的Z+喷注事件样本（Z+jet event sample）。可观测量以喷注横向动量（jet transverse momentum）的分箱形式进行测量，并作为喷注半径参数（jet radius parameter）的函数开展测量。每项测量均重复应用了“软滴（Soft Drop）”刷选程序，以去除喷注内的软辐射与大角度辐射。为便于查阅导航，图表采用编码规则命名，各字母/数字的含义依次为：未刷选/已刷选、AK4/AK8、带电粒子、多重数/pTD2/推力/宽度/LHA、[中心双喷注/向前双喷注/Z+喷注，横动量]。