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arXiv 1302.4023hep-ex
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Tevatron上顶夸克性质的测量

Measurements of top-quark properties at the Tevatron

A. W. Jung

摘要:

介绍了最近在Tevatron上对顶夸克性质的测量结果。CDF使用对应于9.0 fb ^{-1}的数据来测量分支分数B(t \rightarrow Wb)/B(t \rightarrow Wq)的比值R、顶夸克衰变为τ轻子的分支分数以及在t \bar{t}产生中产生额外γ的横截面。所有这些测量的结果与其各自的标准模型预期一致。D0使用5.3 fb ^{-1}的数据来测量作为时间函数的t \bar{t}截面。时间依赖性意味着违反了由标准模型扩展实现的洛伦兹不变性。没有观察到时间依赖性,D0在顶夸克扇区中设置了洛伦兹不变性破坏的第一个极限。D0也间接地决定了顶夸克的宽度使用的结果,早期的测量在D0。测得的顶夸克宽度与SM的预期一致,并没有显示任何新的物理贡献的提示。

英文摘要:

Recent measurements of top-quark properties at the Tevatron are presented. CDF uses data corresponding up to 9.0 fb^{-1} to measure the ratio R of the branching fractions B(t \rightarrow Wb) / B(t \rightarrow Wq), the branching fraction for top-quarks decaying into τleptons and the cross section for the production of an additional γin t\bar{t} production. The results from all these measurements agree well with their respective Standard Model expectation. D0 uses 5.3 fb^{-1} of data to measure the t\bar{t} cross section as a function of the time. A time dependency would imply Lorentz invariance violation as implemented by the Standard Model extension. No time dependency is observed and D0 sets first limits in the top-quark sector for Lorentz invariance violation. D0 also determines indirectly the top quark width using the results of earlier measurements at D0. The measured top quark width is in agreement with the SM expectation and does not show any hints for new physics contributions.

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