论文标题
在$ \ sqrt {s} $ = 13 tev的质子 - proton碰撞中，与质子proton碰撞中的w玻色子相关的顶级夸克 - 敌对生产的横截面的测量
Measurement of the cross section of top quark-antiquark pair production in association with a W boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
与W玻色子（$ \ Mathrm {t \ bar {t}} $ W）相关的顶级夸克 - 易夸克对的生产是在质子 - 普罗顿碰撞中测量的。 CMS实验在CERN LHC上记录了分析的数据，对应于138 fb $^{ - 1} $的集成光度。选择了两个或三个lept子（电子和兆子）和其他喷气机的事件。在具有两个瘦素的事件中，多类神经网络用于区分信号和背景过程。根据B夸克强调和Lepton费用的喷气机和喷气机的数量和喷气机的数量和喷气机的数量进行分类。全相空间中的包含$ \ mathrm {t \ bar {t}} $ W生产横截面为868 $ \ pm $ 40（stat）$ \ pm $ 51 $ 51（syst）fb。 $ \ mathrm {t \ bar {t}} $ w $^+$和$ \ mathrm {t \ bar {t}} $ w $^ - $ $ cross部分也被测量为553 $ \ pm $ 30（Stat）在两个横截面中，发现为1.61 $ \ pm $ 0.15（stat）$^{+0.07} _ { - 0.05} $（syst）。测得的横截面大于两个标准偏差内的标准模型预测，并且代表了迄今为止这些横截面的最精确测量。
The production of a top quark-antiquark pair in association with a W boson ($\mathrm{t\bar{t}}$W) is measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The analyzed data was recorded by the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 138 fb$^{-1}$. Events with two or three leptons (electrons and muons) and additional jets are selected. In events with two leptons, a multiclass neural network is used to distinguish between the signal and background processes. Events with three leptons are categorized based on the number of jets and of jets originating from b quark hadronization, and the lepton charges. The inclusive $\mathrm{t\bar{t}}$W production cross section in the full phase space is measured to be 868 $\pm$ 40 (stat) $\pm$ 51 (syst) fb. The $\mathrm{t\bar{t}}$W$^+$ and $\mathrm{t\bar{t}}$W$^-$ cross sections are also measured as 553 $\pm$ 30 (stat) $\pm$ 30 (syst) and 343 $\pm$ 26 (stat) $\pm$ 25 (syst) fb, respectively, and the corresponding ratio of the two cross sections is found to be 1.61 $\pm$ 0.15 (stat) $^{+0.07}_{-0.05}$ (syst). The measured cross sections are larger than but consistent with the standard model predictions within two standard deviations, and represent the most precise measurement of these cross sections to date.
