Measurement of the top quark-pair production cross section with ATLAS in pp collisions at √s=7 TeV
Measurement of the top quark-pair production cross section with ATLAS in pp collisions at √s=7 TeV
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DOI：
10.1140/epjc/s10052-011-1577-6
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发表时间：
2011-03-01
影响因子：
4.4
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
--
作者：
Aad, G.;Abbott, B.;Zwalinski, L.
利用大型强子对撞机ATLAS探测器记录的数据，测量了根s = 7 TeV的pp碰撞中顶夸克对（t（t）over bar）的产生截面.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喷流，和双轻子（ee，μ μ或e μ）与大失踪的横向能量和至少两个喷流。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t（t）标准模型过程的相应预期背景，并分别确定为12.2 +/- 3.9起事件和2.5 +/- 0.6起事件。所选事件的运动学特征与沙坝生产上的SM t（t）一致。包含的顶夸克对产生截面被测量为besigma（t（t）over bar）= 145 +/- 31（stat.）（-27）（+42）（系统）测量结果与微扰QCD计算结果一致。
A measurement of the production cross-section for top quark pairs (t (t) over bar) in pp collisions at root 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 mu) with large missing transverse energy and at least four jets, and dilepton (ee, mu mu or e mu) 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-t (t) over bar Standard Model processes are estimated using data-driven methods and determined to be 12.2 +/- 3.9 events and 2.5 +/- 0.6 events, respectively. The kinematic properties of the selected events are consistent with SM t (t) over bar production. The inclusive top quark pair production cross-section is measured to besigma(t (t) over bar) = 145 +/- 31 (stat.)(-27)(+42) (syst.) pb.The measurement agrees with perturbative QCD calculations.