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arXiv 2007.01554hep-ex
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用ATLAS探测器在$\sqrt{s} = 8$ TeV上测量与$W$玻色子有关的单轻子通道中的单顶夸克产生

Measurement of single top-quark production in association with a $W$ boson in the single-lepton channel at $\sqrt{s} = 8$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

用质子-质子碰撞测量了顶夸克与$\sqrt{s} = 8$玻色子的产生截面。该数据集对应于20.2 fb $^{-1}$的积分光度,并于2012年由欧洲核子研究中心大型强子对撞机的ATLAS探测器收集。在单轻子通道中进行分析。事件的选择需要一个孤立的轻子(电子或μ子)和至少三个喷流。训练神经网络以将$tW$信号与占优势的$t\bar{t}$背景分离。横截面提取从一个分箱的配置文件最大似然拟合到一个二维判别建立从神经网络输出和强子衰变$W$玻色子的不变质量。测得的横截面为$σ_{tW} = 26 \pm 7$ pb,与标准模型预期值非常一致。

英文摘要:

The production cross-section of a top quark in association with a $W$ boson is measured using proton-proton collisions at $\sqrt{s} = 8$ TeV. The dataset corresponds to an integrated luminosity of 20.2 fb$^{-1}$, and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the $tW$ signal from the dominant $t\bar{t}$ background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying $W$ boson. The measured cross-section is $σ_{tW} = 26 \pm 7$ pb, in good agreement with the Standard Model expectation.

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