"Table 40" 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，研究团队针对顶夸克对 (top quark pairs) 的产生过程，测量了其随顶夸克以及顶夸克-反顶夸克 (top quark-antiquark, ttbar) 系统运动学变量变化的微分与双微分截面 (differential and double-differential cross sections)。此外，本研究还测量了与顶夸克对产生相关的喷注 (jet) 的运动学变量与多重数。本分析基于大型强子对撞机 (Large Hadron Collider, LHC) 上的紧凑型μ子线圈 (Compact Muon Solenoid, CMS) 实验在2016年采集的数据，对应的积分亮度为35.8 fb⁻¹。本次测量针对轻子+喷注 (lepton+jets) 末态衰变道开展，该衰变道包含单个μ子或电子以及末态喷注。本次测量的微分截面分别在接近实验接收度的相空间内的粒子级 (particle level)，以及全相空间内的部分子级 (parton level) 给出。研究结果与若干采用不同方法与近似方案的标准模型 (Standard Model) 预言进行了对比。总体而言，顶夸克及顶夸克-反顶夸克系统的运动学变量分布得到了较好的描述，但尚无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趋势比理论预言更为陡峭。而喷注的运动学分布与多重数，则可通过次领头阶计算 (next-to-leading-order calculations) 与部分子簇射模型 (parton shower models) 的特定组合得到较好的建模。