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arXiv 0909.4518hep-ex
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在Tevatron上观测到单顶夸克产生

Observation of Single Top Quark Production at the Tevatron

A. P. Heinson

摘要:

本文报道了DZero和CDF合作首次观测到的单顶夸克的电弱产生。在费米实验室的1.96 TeV质子-反质子对撞机上,几千个事件是从几个包含孤立的电子或μ子和/或丢失的横向能量的逆飞秒场数据中选出的,还有来自b夸克衰变的喷流。使用复杂的多变量分析将信号与背景分离,DZero合作测量了截面sigma(ppbar->tb+X,tqb+X)= 3.94 +- 0.88 pb(对于170 GeV的顶夸克质量),CDF合作测量了2.3_0.6 - 0.5 pb(对于175 GeV的顶夸克质量)。这些值是一致的理论预测在次领先的顺序精度。两个测量值的显著性均为5.0标准差,符合被视为明确观察的基准。

英文摘要:

This paper reports on the first observation of electroweak production of single top quarks by the DZero and CDF collaborations. At Fermilab's 1.96 TeV proton-antiproton collider, a few thousand events are selected from several inverse femtobarns of data that contain an isolated electron or muon and/or missing transverse energy, together with jets that originate from the decays of b quarks. Using sophisticated multivariate analyses to separate signal from background, the DZero collaboration measures a cross section sigma(ppbar->tb+X,tqb+X) = 3.94 +- 0.88 pb (for a top quark mass of 170 GeV) and the CDF collaboration measures a value of 2.3_0.6 -0.5 pb (for a top quark mass of 175 GeV). These values are consistent with theoretical predictions at next-to-leading order precision. Both measurements have a significance of 5.0 standard deviations, meeting the benchmark to be considered unambiguous observation.

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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