"Table 236" 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以及顶夸克-反顶夸克（ttbar）系统运动学变量函数的微分截面与双微分截面。此外，本研究还测量了与ttbar产生过程相关的喷注运动学变量及喷注多重数。本分析基于大型强子对撞机（Large Hadron Collider）上的CMS（Compact Muon Solenoid）实验于2016年采集的数据，对应积分亮度为35.8 fb⁻¹。测量工作针对末态包含单个缪子或电子以及喷注的轻子+喷注衰变道展开。微分截面分别在接近实验接收度的相空间内的粒子层次，以及全相空间中的部分子层次上给出。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合理描述，但尚无任何一个理论预言能够复现所有测量得到的分布。尤为突出的是，顶夸克的横向动量分布比理论预言的下降得更陡峭。部分喷注的运动学分布及喷注多重数，则可通过若干次领头阶计算与部分子喷注模型的组合方案得到较好的建模描述。