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arXiv 0811.4688hep-ex
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ATLAS的单顶横截面测量

Single-top Cross Section Measurements at ATLAS

P. Ryan

摘要:

单顶产生截面是大型强子对撞机顶对产生截面的三分之一。在一年的数据采集过程中,假设平均光度为10^33 cm-2 s-1,CMS能量为14 TeV,确定对总单顶截面的主要贡献应该是可以实现的。测量的截面和理论预测之间的比较将提供对标准模型的关键检验。这些测量还将导致|V_tb|的第一次直接测量,精度为百分之几。此外,他们将通过寻找与顶夸克的异常耦合的证据以及测量对单顶产生的额外玻色子贡献来探索新的物理学。提出了在三个生产通道中优化选择单顶事件的方法,并建立了积分亮度为1 fb-1和30 fb-1的截面测量的可能性。

英文摘要:

The single-top production cross section is one third that of the top-pair production cross section at the LHC. During a year of data-taking, assuming an average luminosity of 10^33 cm-2 s-1 and a CMS energy of 14 TeV, the determination of the major contributions to the total single-top cross section should be achievable. Comparisons between the measured cross sections and the theoretical predictions will provide a crucial test of the standard model. These measurements should also lead to the first direct measurement of |V_tb|, with a precision at the level of a few percent. In addition, they will probe for new physics via the search for evidence of anomalous couplings to the top quark and the measurements of additional bosonic contributions to single-top production. Methods developed to optimize the selection of single-top events in the three production channels are presented and the potential for the cross section measurements with 1 fb-1 and 30 fb-1 of integrated luminosity is established.

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