论文标题
$ \ sqrt {s} $ = 13 tev的质子 - 普罗顿碰撞中的W玻色子，对单个顶级夸克产生的包含和差分横截面的测量
Measurement of inclusive and differential cross sections for single top quark production in association with a W boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
提出了包含和归一化差分截面的测量值，用于生产单个顶级夸克，与质子 - 蛋白质碰撞中的W玻色子相关，在13 TEV的质量中心能量中。使用的数据在2016 - 2018年期间与LHC的CMS检测器记录，对应于138 fb $^{ - 1} $的集成发光度。分析了最终状态中包含一个电子和一个兆子的事件。对于包容性测量，利用事件的运动学特性的多元判别物用于将信号与主导的$ \ mathrm {t \ bar {t}} $背景区分开。 79.2 $ \ pm $ 0.9（stat）$^{+7.7} _ { - 8.0} $（syst）$ \ pm $ \ pm $ 1.2（lumi）PB的横截面是一致的。对于差异测量，根据检测器的接受度定义了一个基准区域，以及恰好来自底部夸克碎片的射流的要求。所得的分布被展开至粒子水平，并与扰动量子染色体动力学中近代领先顺序的预测一致。
Measurements of the inclusive and normalised differential cross sections are presented for the production of single top quarks in association with a W boson in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data used were recorded with the CMS detector at the LHC during 2016-2018, and correspond to an integrated luminosity of 138 fb$^{-1}$. Events containing one electron and one muon in the final state are analysed. For the inclusive measurement, a multivariate discriminant, exploiting the kinematic properties of the events is used to separate the signal from the dominant $\mathrm{t\bar{t}}$ background. A cross section of 79.2 $\pm$ 0.9 (stat) $^{+7.7}_{-8.0}$ (syst) $\pm$ 1.2 (lumi) pb is obtained, consistent with the predictions of the standard model. For the differential measurements, a fiducial region is defined according to the detector acceptance, and the requirement of exactly one jet coming from the fragmentation of a bottom quark. The resulting distributions are unfolded to particle level and agree with the predictions at next-to-leading order in perturbative quantum chromodynamics.
