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arXiv 0907.4259hep-ex
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t通道单顶夸克产生截面的测量

Measurement of the t-channel single top quark production cross section

D0 Collaboration, V. Abazov

摘要:

D 0合作报告了通过虚W玻色子的t通道交换产生单个顶夸克的直接证据。这是第一个分离出单个顶夸克产生通道的分析。我们选择了费米实验室Tevatron对撞机上2.3 fb^-1 ppbar碰撞中的事件,这些事件包含一个孤立的电子或μ子,缺少横能量,以及两个、三个或四个喷流。其中一个或两个喷流被确定为含有b强子。我们结合了三个多变量技术优化的t-通道过程中测量的t-和s-通道截面同时。我们测量的t沟道的截面为3.14 ± 0.94 - 0.80 pb,s沟道的截面为1.05 ± 0.81 pb。发现测量的t通道结果具有4.8标准差的显著性,并且与标准模型预测一致。

英文摘要:

The D0 collaboration reports direct evidence for electroweak production of single top quarks through the t-channel exchange of a virtual W boson. This is the first analysis to isolate an individual single top quark production channel. We select events containing an isolated electron or muon, missing transverse energy, and two, three or four jets from 2.3 fb^-1 of ppbar collisions at the Fermilab Tevatron Collider. One or two of the jets are identified as containing a b hadron. We combine three multivariate techniques optimized for the t-channel process to measure the t- and s-channel cross sections simultaneously. We measure cross sections of 3.14 +0.94 -0.80 pb for the t-channel and 1.05 +-0.81 pb for the s-channel. The measured t-channel result is found to have a significance of 4.8 standard deviations and is consistent with the standard model prediction.

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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