"Extra Figure g4cp[Z88]" 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].

本研究报道了用于刻画夸克引发喷注与胶子引发喷注组分的喷注子结构（jet substructure）测量结果。本次分析采用CMS探测器采集的质心系能量√s=13 TeV的质子-质子（pp）对撞数据，对应积分亮度为35.9 fb⁻¹。我们测量了广义角性（generalized angularities），该可观测量可用于刻画喷注子结构并区分夸克引发与胶子引发喷注。此类可观测量对喷注内部的横向动量分布与角间距分布具有敏感性。本分析使用了两类事件样本：一类是富含胶子引发喷注的双喷注（dijet）事件样本，同时首次采用了富含夸克引发喷注的Z+喷注（Z+jet）事件样本。可观测量按照喷注横向动量的分箱进行测量，并以喷注半径参数为函数开展测量。每一项测量均在应用“软滴（soft drop）”清洗算法的条件下重复进行，该算法可去除喷注内的软辐射与大角度辐射。为便于检索，图表采用编码命名，每个字母/数字按以下顺序代表对应含义：未清洗/已清洗、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]。