Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2011 Dec 2;107(23):232002. doi: 10.1103/PhysRevLett.107.232002. Epub 2011 Nov 30.
We present a measurement of the top-quark mass using a sample of t ̄t events in 5.7 fb(-1) of integrated luminosity from p ̄p collisions at the Fermilab Tevatron with √s=1.96 TeV and collected by the CDF II Detector. We select events having large missing transverse energy, and four, five, or six jets with at least one jet tagged as coming from a b quark, and reject events with identified charged leptons. This analysis considers events from the semileptonic t ̄t decay channel, including events that contain tau leptons. The measurement is based on a multidimensional template method. We fit the data to signal templates of varying top-quark masses and background templates, and measure a top-quark mass of M(top)=172.32±2.4(stat)±1.0(syst) GeV/c(2).
我们展示了一项顶夸克质量的测量结果，该结果基于在美国费米实验室 Tevatron 质子-反质子对撞机上以 √s=1.96 TeV 对 5.7 fb(-1)的积分亮度采集的 t ̄t 事件样本，由 CDF II 探测器完成。我们选择具有大的横向能量缺失的事件，以及具有至少一个标记为来自 b 夸克的喷流的四个、五个或六个喷流，同时排除具有识别出的带电轻子的事件。这个分析考虑了来自半轻子 t ̄t 衰变道的事件，包括包含 tau 轻子的事件。这个测量是基于多维模板方法进行的。我们将数据拟合到具有不同顶夸克质量的信号模板和背景模板，测量得到顶夸克质量为 M(top)=172.32±2.4(stat)±1.0(syst) GeV/c(2)。
