"Table 105" of "Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton+jets events from pp collisions at $\sqrt{s} =$ 13 TeV"

Differential and double-differential cross sections for the production of top quark pairs in proton-proton collisions at sqrt{s} = 13 TeV are measured as a function of kinematic variables of the top quarks and the top quark-antiquark (ttbar) system. In addition, kinematic variables and multiplicities of jets associated with the ttbar production are measured. This analysis is based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.8/fb. The measurements are performed in the lepton+jets decay channels with a single muon or electron and jets in the final state. The differential cross sections are presented at the particle level, within a phase space close to the experimental acceptance, and at the parton level in the full phase space. The results are compared to several standard model predictions that use different methods and approximations. The kinematic variables of the top quarks and the ttbar system are reasonably described in general, though none predict all the measured distributions. In particular, the transverse momentum distribution of the top quarks is more steeply falling than predicted. The kinematic distributions and multiplicities of jets are adequately modeled by certain combinations of next-to-leading-order calculations and parton shower models.在质心系能量√s = 13 TeV的质子-质子碰撞中，本研究针对顶夸克对（top quark pairs）的产生过程，测量了其作为顶夸克及顶夸克-反顶夸克（top quark-antiquark，简称ttbar）系统运动学变量的函数的微分与双微分截面。此外，本工作还测量了与ttbar产生过程相关的喷注（jets）的运动学变量及多重数。本分析基于大型强子对撞机（Large Hadron Collider, LHC）上的CMS实验于2016年采集的积分亮度为35.8 fb⁻¹的数据。测量在末态包含单个μ子或电子以及喷注的轻子+喷注衰变道（lepton+jets decay channels）中开展。微分截面分别在接近实验接受度的粒子层次（particle level）相空间，以及全相空间的部分子层次（parton level）上呈现。研究结果与若干采用不同方法与近似的标准模型（Standard Model）预言进行了对比。总体而言，顶夸克及ttbar系统的运动学变量得到了较好的描述，但尚无任何一个预言能够复现所有的测量分布。尤为突出的是，顶夸克的横动量分布比理论预言的下降得更陡。部分次领头阶（next-to-leading-order）计算与部分子喷注模型（parton shower models）的特定组合，能够较好地描述喷注的运动学分布与多重数。