"Table 63" 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.

本研究报道了大型强子对撞机（Large Hadron Collider, LHC）上的紧凑型μ子线圈（Compact Muon Solenoid, CMS）实验的结果：针对质心系能量为$13~mathrm{TeV}$的质子-质子碰撞中t道单顶夸克及反顶夸克产生过程的微分截面开展测量。本次分析使用积分亮度为$35.9~mathrm{fb}^{-1}$的数据样本，对包含1个μ子或电子以及2或3个喷注的物理事例展开研究。截面测量以顶夸克横动量（transverse momentum, $p_ ext{T}$）、快度（rapidity）、极化角，带电轻子横动量与快度，以及顶夸克衰变产生的W玻色子横动量作为观测变量。此外，还对电荷比进行了差分测量，其以顶夸克、带电轻子与W玻色子的运动学可观测量作为观测变量。研究结果与采用多种次领头阶（next-to-leading-order, NLO）事件产生器及多组部分子分布函数（parton distribution function, PDF）的标准模型（Standard Model, SM）预言相一致。另外，对顶夸克极化敏感的自旋不对称度，通过部分子层级下极化角的微分分布测得为$0.440 pm 0.070$，与标准模型的预言相符。