A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at root s=7 TeV

	A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at root s=7 TeV
	ATLAS collaboration
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2012
期号	9
关键词	EP COLLISIONS P(P)OVER-BAR COLLISIONS SUPERSYMMETRIC MODELS E(+)E(-) COLLISIONS DOUBLET MODELS HERA FCNC LHC PERFORMANCE COUPLINGS
通讯作者	Woudstra, MJ (reprint author), CERN, Geneva, Switzerland.
英文摘要	A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of root s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb(-1), were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t -> Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t -> Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t -> Zq branching ratio of BR(t -> Zq) < 0.73% is set at the 95% confidence level.
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000310341200001
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213367]
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. A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at root s=7 TeV[J]. JOURNAL OF HIGH ENERGY PHYSICS,2012(9).
APA	ATLAS collaboration.(2012).A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at root s=7 TeV.JOURNAL OF HIGH ENERGY PHYSICS(9).
MLA	ATLAS collaboration."A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at root s=7 TeV".JOURNAL OF HIGH ENERGY PHYSICS .9(2012).