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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1607.01907hep-ex
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在LHC上用ATLAS探测器测量顶夸克对性质

Top quark pair property measurements using the ATLAS detector at the LHC

Mohammad J. Kareem

摘要:

对顶夸克性质的精确测量可以检验标准模型,并可用于约束新的物理模型。顶夸克对电荷不对称性是一种预测在SM中发生在首阶QCD之外的不对称性,并且可能会因新物理的存在而显着增强。$t\bar{t}$生产电荷不对称性的测量包括和差分使用8 TeV的ATLAS数据集在轻子+喷流的最终状态,包括一个专门的测量高度提升顶夸克。结果与SM一致,并与新的物理模型进行了比较。在SM中,顶夸克几乎只衰变为\textit{W}玻色子和\textit{b}夸克。利用8 TeV ATLAS数据集(包括$t \rightarrow qH$和$t \rightarrow qZ$)对非SM顶夸克衰变进行了计算.此外,还讨论了利用极角分布测量顶夸克对产生中的自旋关联。

英文摘要:

Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models. The top quark pair charge asymmetry is an asymmetry predicted to occur beyond leading-order QCD in the SM, and may be significantly enhanced by the presence of new physics. The $t\bar{t}$ production charge asymmetry is measured inclusively and differentially using the 8 TeV ATLAS dataset in the lepton+jets final state, including a dedicated measurement for highly boosted top quarks. The results are in agreement with the SM and compared to new physics models. The top quark is predicted in the SM to decay almost exclusively to a \textit{W} boson and \textit{b} quark. Searches for non-SM top quark decays using the 8 TeV ATLAS dataset, including $t \rightarrow qH$ and $t \rightarrow qZ$ are presented. In addition, the measurement of the spin correlations in top quark pair production using the polar angles distribution is discussed.

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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