论文标题
使用$ \ mathrm {t \ bar {t}} $+JET EVENT在Proton-Proton碰撞中的$ \ sqrt {s} $ = 13 TEV中，使用$ \ mathrm {t \ bar {t}} $+喷气事件测量顶级夸克极质量
Measurement of the top quark pole mass using $\mathrm{t\bar{t}}$+jet events in the dilepton final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
在最顶级的夸克 - 易药对（$ \ mathrm {t \ bar {t}} $）中，在事件中测量了顶部夸克极质量$ m_ \ mathrm {t}^\ text {pole} $，与至少另外一个JET（$ \ Mathrm {t \ bar {t \ bar {t \ bar {t} iSED）产生。该分析是使用$ \ sqrt {s} $ = 13 TEV在CERN LHC上收集的proton-Proton碰撞数据进行的，对应于总计36.3 fb $^{ - 1} $。分析了最终状态下有两个相对链的事件（E $^+$ e $^ - $，$μ^+μ^ - $，e $^\pmμ^\ mp $）。使用基于机器学习的多元分析技术优化了主要观察值和事件分类的重建。生产横截面的测量是$ \ mathrm {t \ bar {t}} $+喷气系统在Parton级别使用最大可能性展开在Parton级别的不变质量的函数。给定参考Parton分布函数（PDF），使用近代领先顺序的理论预测提取顶部的夸克极质量。对于ABMP16NLO PDF，这将导致$ M_ \ Mathrm {t}^\ text {pole} $ = 172.93 $ \ pm $ 1.36 GEV。
A measurement of the top quark pole mass $m_\mathrm{t}^\text{pole}$ in events where a top quark-antiquark pair ($\mathrm{t\bar{t}}$) is produced in association with at least one additional jet ($\mathrm{t\bar{t}}$+jet) is presented. This analysis is performed using proton-proton collision data at $\sqrt{s}$ = 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to a total integrated luminosity of 36.3 fb$^{-1}$. Events with two opposite-sign leptons in the final state (e$^+$e$^-$, $μ^+μ^-$, e$^\pmμ^\mp$) are analyzed. The reconstruction of the main observable and the event classification are optimized using multivariate analysis techniques based on machine learning. The production cross section is measured as a function of the inverse of the invariant mass of the $\mathrm{t\bar{t}}$+jet system at the parton level using a maximum likelihood unfolding. Given a reference parton distribution function (PDF), the top quark pole mass is extracted using the theoretical predictions at next-to-leading order. For the ABMP16NLO PDF, this results in $m_\mathrm{t}^\text{pole}$ = 172.93 $\pm$ 1.36 GeV.
