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Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV
ATLAS collaboration
2012
发表期刊PHYSICS LETTERS B
卷号716期号:1页码:142-159
通讯作者Arik, E (reprint author), Bogazici Univ, Dept Phys, Istanbul, Turkey.
摘要This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb(-1) of pp collision data at root s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3 sigma level, the expected sensitivity assuming the Standard Model production rate being 3.4 sigma. The corresponding cross-section is determined and found to be sigma(wt) = 16.8 +/- 2.9 (stat) +/- 4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element vertical bar V-tb vertical bar = 1.03(-0.19)(+0.16) is derived assuming that the Wt production through vertical bar V-ts vertical bar and vertical bar V-td vertical bar is small. (C) 2012 CERN. Published by Elsevier B.V All rights reserved.
学科领域Physics
DOI10.1016/j.physletb.2012.08.011
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000309621400007
引用统计
被引频次:55[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213345
专题实验物理中心
作者单位中国科学院高能物理研究所
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ATLAS collaboration. Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV[J]. PHYSICS LETTERS B,2012,716(1):142-159.
APA ATLAS collaboration.(2012).Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV.PHYSICS LETTERS B,716(1),142-159.
MLA ATLAS collaboration."Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV".PHYSICS LETTERS B 716.1(2012):142-159.
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