"Table 61" of "Measurement of differential cross sections and charge ratios for $t$-channel single top quark production in proton-proton collisions at $\sqrt{s}=$ 13 TeV"

A measurement is presented of differential cross sections for $t$-channel single top quark and antiquark production in proton-proton collisions at a centre-of-mass energy of $13~\rm{TeV}$ by the CMS experiment at the LHC. From a data set corresponding to an integrated luminosity of $35.9~\rm{fb}^{-1}$, events containing one muon or electron and two or three jets are analysed. The cross section is measured as a function of the top quark transverse momentum ($p_{\rm{T}}$), rapidity, and polarisation angle, the charged lepton $p_{\rm{T}}$ and rapidity, and the $p_{\rm{T}}$ of the W boson from the top quark decay. In addition, the charge ratio is measured differentially as a function of the top quark, charged lepton, and W boson kinematic observables. The results are found to be in agreement with standard model predictions using various next-to-leading-order event generators and sets of parton distribution functions. Additionally, the spin asymmetry, sensitive to the top quark polarisation, is determined from the differential distribution of the polarisation angle at parton level to be $0.440 \pm 0.070$, in agreement with the standard model prediction.

本工作报道了大型强子对撞机（Large Hadron Collider, LHC）上紧凑μ子线圈（Compact Muon Solenoid, CMS）实验在质心能量13 TeV的质子-质子碰撞中，t道单顶夸克与反顶夸克产生过程的微分截面测量结果。本次分析所用数据集的积分亮度为35.9 fb⁻¹，选取包含1个μ子或电子、2至3个喷注的事例开展研究。本次测量的截面作为以下物理量的函数被提取：顶夸克的横向动量（$p_mathrm{T}$）、快度与极化角，带电轻子的$p_mathrm{T}$与快度，以及顶夸克衰变产生的W玻色子的$p_mathrm{T}$。此外，本工作还针对顶夸克、带电轻子与W玻色子的运动学可观测量，对电荷比进行了微分测量。研究结果与采用多种次领头阶（next-to-leading-order, NLO）事件发生器及多组部分子分布函数（parton distribution functions, PDFs）所给出的标准模型（Standard Model, SM）预言相符。此外，通过部分子层次下极化角的微分分布，我们提取出对顶夸克极化敏感的自旋不对称度为$0.440 pm 0.070$，该结果同样与标准模型预言一致。