Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel
Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel
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DOI：
10.1016/j.physletb.2012.03.083
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发表时间：
2012-05-15
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.在单轻子拓扑中，事件的选择需要一个电子或μ子，大的缺失横动量和至少三个喷流。对于35 pb（-1）的数据样本，两种不同的多变量方法，其中一种使用b夸克喷注识别，而另一种不使用，使用运动学变量获得sigma（t（t）over bar）= 187 +/- 11（stat.）（-17）（+18）（系统）+/- 6（流明）pb和sigma（t（t）/bar）= 173 +/- 17（统计）（-16）（+18）（系统）+/- 6（流明）PB分别。这两个测量结果是一致的，并与QCD计算。第一个测量具有更好的先验灵敏度，构成了这封信的主要结果。(c)2012年欧洲核子研究中心。Elsevier B. V.出版，保留所有权利。
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 the single lepton topology by requiring an electron or muon, large missing transverse momentum and at least three jets. With a data sample of 35 pb(-1), two different multivariate methods, one of which uses b-quark jet identification while the other does not, use kinematic variables to obtain cross-section measurements of sigma(t (t) over bar) = 187 +/- 11(stat.)(-17)(+18)(syst.) +/- 6(lumi.) pb and sigma(t (t) over bar) = 173 +/- 17(stat.)(-16)(+18)(syst.) +/- 6(lumi.) pb respectively. The two measurements are in agreement with each other and with QCD calculations. The first measurement has a better a priori sensitivity and constitutes the main result of this Letter. (c) 2012 CERN. Published by Elsevier B.V. All rights reserved.