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Department of Physics, University of Helsinki, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2009 Jan 30;102(4):042001. doi: 10.1103/PhysRevLett.102.042001. Epub 2009 Jan 28.
We present the first direct experimental bound on the total decay width of the top quark, Gamma(t), using 955 pb(-1) of the Tevatron's pp collisions recorded by the Collider Detector at Fermilab. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from these events is fitted to templates representing different values of the top quark width. Using a confidence interval based on likelihood-ratio ordering, we extract an upper limit at 95% C.L. of Gamma(t)<13.1 GeV for an assumed top quark mass of 175 GeV/c(2).
我们利用费米实验室对撞机探测器记录的955皮靶逆的Tevatron质子-质子碰撞数据，给出了顶夸克总衰变宽度Γ(t)的首个直接实验限制。我们识别出253个顶-反顶夸克对候选事件。将这些事件重建的顶夸克质量分布与代表不同顶夸克宽度值的模板进行拟合。基于似然比排序的置信区间，对于假定的顶夸克质量175 GeV/c²，我们在95%置信水平下提取出Γ(t)<13.1 GeV的上限。
