Search for FCNC single top-quark production at root s=7 TeV with the ATLAS detector

	Search for FCNC single top-quark production at root s=7 TeV with the ATLAS detector
	ATLAS collaboration
刊名	PHYSICS LETTERS B
	2012
卷号	712 期号:4--5 页码:351-369
关键词	CHANGING NEUTRAL CURRENTS P(P)OVER-BAR COLLISIONS SUPERSYMMETRIC MODELS HADRON COLLIDERS DECAYS COUPLINGS
通讯作者	Arik, E (reprint author), Bogazici Univ, Dept Phys, Istanbul, Turkey.
英文摘要	A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of root s = 7 TeV, corresponding to an integrated luminosity of 2.05 fb(-1), are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the t -> Wb branching fraction is measured to be sigma(qg -> t) x B(t -> Wb) < 3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths kappa(ugt)/Lambda < 6.9.10(-3) TeV-1 and kappa(cgt)/Lambda < 1.6.10(-2) TeV-1, where A is the new physics scale, and on the branching fractions B(t -> ug) < 5.7.10(-5) and B(t -> cg) < 2.7.10(-4). (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
语种	英语
WOS记录号	WOS:000305378200006
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213263]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	ATLAS collaboration. Search for FCNC single top-quark production at root s=7 TeV with the ATLAS detector[J]. PHYSICS LETTERS B,2012,712(4--5):351-369.
APA	ATLAS collaboration.(2012).Search for FCNC single top-quark production at root s=7 TeV with the ATLAS detector.PHYSICS LETTERS B,712(4--5),351-369.
MLA	ATLAS collaboration."Search for FCNC single top-quark production at root s=7 TeV with the ATLAS detector".PHYSICS LETTERS B 712.4--5(2012):351-369.