"Table 102" 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，我们针对顶夸克对的产生过程，测量了其作为顶夸克与顶夸克-反夸克（ttbar）系统运动学变量函数的微分与双微分截面。此外，本分析还测量了与ttbar产生过程相关的喷注的运动学变量及多重数。本研究基于大型强子对撞机（Large Hadron Collider, LHC）上的紧凑缪子线圈（Compact Muon Solenoid, CMS）实验于2016年采集的数据，对应的积分亮度为35.8 fb⁻¹。测量工作在单缪子或单电子伴随末态喷注的轻子+喷注衰变道中开展。微分截面分别在接近实验接收度的相空间区域的粒子层次，以及全相空间的部分子层次上给出。将本次测量结果与若干采用不同方法与近似方案的标准模型（Standard Model）预言进行对比后发现：总体而言，顶夸克及ttbar系统的运动学变量得到了合理描述，但没有任何一个理论预言能够复现所有的测量分布；具体而言，顶夸克的横向动量分布的下降斜率比理论预言更为陡峭。部分喷注的运动学分布与多重数可通过若干次领头阶（next-to-leading order, NLO）计算与部分子簇射模型的组合得到充分建模。