"Extra Figure u8L[Z] (vs.PT)" 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].

本工作报道了针对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。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。研究测量了广义角距度（Generalized angularities），该可观测量可用于刻画喷注子结构并区分夸克与胶子引发的喷注。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。分析分别采用了胶子喷注占优的双喷注（dijet）事件样本，以及首次使用的夸克喷注占优的Z+喷注事件样本。研究按喷注横向动量的分箱以及喷注半径参数的取值对可观测量进行了测量。每一组测量均通过施加"软滴（soft drop）"修整流程完成，该流程可移除喷注内的软辐射与大角度辐射成分。为便于查阅，所有图表采用编码命名，编码各字符/数字依次代表：未修整/已修整、AK4/AK8、带电粒子、多重数/pTD2/喷注重心/喷注宽度/LHA、[中心区双喷注/前向区双喷注/Z+喷注，横向动量（PT）]。