arXiv 1109.41002011-09-19hep-ex

用ATLAS探测器测量单顶夸克产生

Measurement of Single-top Quark Production with the ATLAS Detector

J. L. Holzbauer

备注：: 7 pages, Proceedings of the DPF-2011 Conference, Providence, RI, August 8-13, 2011

摘要：

单顶生产已经研究了与ATLAS探测器使用0.7 fb-1的2011年的数据记录在7 TeV的质心能量。顶夸克的电弱产生的测量允许探测Wtb顶点和直接测量CKM矩阵元|V_tb|。它还有望对新的物理现象敏感，如味道改变中性电流或重W生产。使用基于切割和神经网络的方法进行t通道横截面测量，同时使用双轻子通道中基于切割的选择来导出相关（Wt）生产的限制。t通道的实测横截面为90 +32 -22 pb（预期为65 +28 -19 pb），这与标准模型的预期一致。对于Wt生产，推导出< 39.1 pb（预期为40.6 pb）的观测限值，这相当于标准模型预期的约2.5倍。

英文摘要：

Single-top production has been studied with the ATLAS detector using 0.7 fb-1 of 2011 data recorded at 7 TeV center-of-mass energy. The measurement of electroweak production of top-quarks allows probes of the Wtb vertex and a direct measurement of the CKM matrix element |V_tb|. It is also expected to be sensitive to new physics such as flavor changing neutral currents or heavy W production. The t-channel cross-section measurements are performed using both a cut-based and neural network approach, while a cut-based selection in the dilepton channel is used to derive a limit on the associated (Wt) production. An observed cross-section of 90 +32 -22 pb (65 +28 -19 pb expected) is obtained for the t-channel, which is consistent with the Standard Model expectation. For the Wt production, an observed limit of < 39.1 pb (40.6 pb expected) is derived, which corresponds to about 2.5 times the Standard Model expectation.

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