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Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2007 Nov 2;99(18):182002. doi: 10.1103/PhysRevLett.99.182002. Epub 2007 Oct 31.
We present a measurement of the mass of the top quark from proton-antiproton collisions recorded at the CDF experiment in Run II of the Fermilab Tevatron. We analyze events from the single lepton plus jets final state (tt-->W(+)bW(-)b-->lnubqq'b). The top-quark mass is extracted using a direct calculation of the probability density that each event corresponds to the tt final state. The probability is a function of both the mass of the top quark and the energy scale of the calorimeter jets, which is constrained in situ by the hadronic W boson mass. Using 167 events observed in 955 pb(-1) of integrated luminosity, we achieve the single most precise measurement of the top-quark mass, 170.8+/-2.2(stat.)+/-1.4(syst.) GeV/c(2).
我们展示了费米实验室Tevatron对撞机II期运行中CDF实验记录的质子-反质子碰撞中顶夸克质量的测量结果。我们分析了单轻子加喷注末态（tt→W⁺bW⁻b→lnubqq'b）的事例。通过直接计算每个事例对应tt末态的概率密度来提取顶夸克质量。该概率是顶夸克质量和量能器喷注能量标度的函数，强子W玻色子质量在原位对能量标度进行约束。利用在955 pb⁻¹的积分亮度中观测到的167个事例，我们实现了对顶夸克质量的单次最精确测量，为170.8±2.2（统计）±1.4（系统）GeV/c²。
