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arXiv 0908.4553hep-ex
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用D0探测器观测单顶夸克产生

Observation of Single Top Quark Production with the D0 Detector

Reinhard Schwienhorst

摘要:

我们报告了D0合作组使用费米实验室Tevatron ppbar对撞机收集的2.3 fb ^-1数据集观测到的单顶夸克产生。几个多变量技术相结合,从背景中分离出单一的顶部信号。测得的单顶截面为3.94 ± 0.88 pb。在没有信号的情况下,在该值或更高值下测量截面的概率为2.9 * 10 ^-7,对应于存在信号时的5.0标准差显著性。95% C.L.的下限CKM矩阵元素Vtb的值为|Vtb|> 0.78。单独测量t形沟道截面,得到3.14 ± 0.94-0.80 pb。

英文摘要:

We report on the observation of single top quark production by the D0 collaboration using a dataset of 2.3 fb^-1 collected at the Fermilab Tevatron ppbar collider. Several multivariate techniques are combined to separate the single top signal from backgrounds. The measured single top cross section is 3.94+-0.88pb. The probability to measure a cross section at this value or higher in the absence of signal is 2.9*10^-7, corresponding to a 5.0 standard deviation significance for the presence of signal. The lower limit at the 95% C.L. on the CKM matrix element Vtb is |Vtb|>0.78. A separate measurement of the t-channel cross section gives 3.14 +0.94 -0.80 pb.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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