arXiv 1012.17922010-12-09hep-ex

在$\sqrt{s}=7\TeV$用ATLAS测量pp碰撞中顶夸克对产生截面

Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$

The ATLAS Collaboration

备注：: 30 pages plus author list (50 pages total), 9 figures, 11 tables, CERN-PH number and final journal added
发表信息：: Eur.Phys.J.C71:1577,2011
DOI：: 10.1140/epjc/s10052-011-1577-6

摘要：

利用大型强子对撞机ATLAS探测器记录的数据，测量了在$pp$上进行的顶夸克对产生截面（$\ttbar$）.事件被选择在两个不同的拓扑结构：单轻子（电子$e$或μ子$μ$）与大失踪的横向能量和至少四个射流，和双轻子（$ee$，$μμ$或$eμ$）与大失踪的横向能量和至少两个射流。在2.9pb ~（-1）的数据样本中，单轻子拓扑中观测到37个候选事例，双轻子拓扑中观测到9个。使用数据驱动方法估计非$\ttbar$标准模型工艺的相应预期背景，并分别确定为$12.2 \pm 3.9$事件和$2.5 \pm 0.6$事件。所选事件的运动学特性与SM $\ttbar$生产一致。包容性的顶夸克对产生截面被测量为$\sigmattbar=145 \pm 31 ^{+42}_{-27}$ pb，其中第一个不确定性是统计的，第二个是系统的。测量结果与微扰QCD计算结果一致。

英文摘要：

A measurement of the production cross-section for top quark pairs($\ttbar$) in $pp$ collisions at $\sqrt{s}=7 \TeV$ is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron $e$ or muon $μ$) with large missing transverse energy and at least four jets, and dilepton ($ee$, $μμ$ or $eμ$) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb-1, 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-$\ttbar$ Standard Model processes are estimated using data-driven methods and determined to be $12.2 \pm 3.9$ events and $2.5 \pm 0.6$ events, respectively. The kinematic properties of the selected events are consistent with SM $\ttbar$ production. The inclusive top quark pair production cross-section is measured to be $\sigmattbar=145 \pm 31 ^{+42}_{-27}$ pb where the first uncertainty is statistical and the second systematic. The measurement agrees with perturbative QCD calculations.

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