"Table 202" 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，我们以顶夸克（top quark）自身以及顶夸克-反顶夸克（top quark-antiquark, ttbar）系统的运动学变量为观测依据，测量了顶夸克对产生过程的单微分截面与双微分截面。此外，我们还测量了与顶夸克对产生过程相关的喷注（jet）的运动学变量及其多重数。本次分析基于大型强子对撞机（Large Hadron Collider, LHC）上的CMS实验于2016年采集的数据，对应积分亮度为35.8 fb⁻¹。本次测量选取末态包含单个缪子或电子以及若干喷注的轻子+喷注衰变道开展。我们分别在接近实验接受度的相空间区域内的粒子级，以及全相空间内的部分子级，给出了微分截面结果。将上述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）预言进行了对比。总体而言，顶夸克与顶夸克对系统的运动学变量得到了较为合理的描述，但现有理论预言均无法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。部分喷注的运动学分布与多重数，可通过次领头阶（next-to-leading-order, NLO）计算与部分子簇射（parton shower）模型的特定组合得到较好的描述。