"Table 68" 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，本分析针对顶夸克对（top quark pairs）的产生过程，测量了作为顶夸克（top quark）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，本分析还测量了与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）的紧凑型μ子线圈（Compact Muon Solenoid, CMS）实验于2016年采集的数据，对应积分亮度为35.8 fb⁻¹。本次测量在末态包含单个μ子或电子以及喷注的轻子+喷注衰变道中完成。微分截面的测量结果分别在接近实验接收度的粒子层次相空间，以及全相空间的部分子层次上给出。我们将测量结果与若干采用不同方法和近似方案的标准模型（Standard Model）预言进行了对比。顶夸克及ttbar系统的运动学变量在整体上得到了合理描述，但目前尚无任何一个理论预言能够复现所有的测量分布。特别地，顶夸克的横动量分布下降趋势比理论预言更为陡峭。喷注的运动学分布与多重数能够通过若干次领头阶（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建模。

搜集汇总

背景与挑战

背景概述

该数据集是CMS实验在13 TeV质子-质子碰撞中测量顶夸克对产生微分截面的一部分，具体为Table 68，提供了绝对截面作为ΔRjt(jW2)函数的实验数据，包含多个ΔRjt区间的截面值和误差。这些数据用于验证标准模型预测，特别是在顶夸克横向动量分布等方面。