Search for pair produced fourth-generation up-type quarks in pp collisions at root s=7 TeV with a lepton in the final state

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	Search for pair produced fourth-generation up-type quarks in pp collisions at root s=7 TeV with a lepton in the final state
	CMS Collaboration
刊名	PHYSICS LETTERS B
	2012
卷号	718 期号:2 页码:307-328
关键词	WEAK-INTERACTIONS MODEL HIGGS BOSON HEAVY LHC
通讯作者	Chatrchyan, S (reprint author), CERN, CH-1211 Geneva 23, Switzerland.
英文摘要	The results of a search for the pair production of a fourth-generation up-type quark (t') in proton-proton collisions at root s = 7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 fb(-1) collected by the Compact Muon Solenoid experiment at the LHC. The t' quark is assumed to decay exclusively to a W boson and a b quark. Events with a single isolated electron or muon, missing transverse momentum, and at least four hadronic jets, of which at least one must be identified as a b jet, are selected. No significant excess of events over standard model expectations is observed. Upper limits for the t'(t) over bar' production cross section at 95% confidence level are set as a function of t' mass, and t'-quark production for masses below 570 GeV is excluded. The search is equally sensitive to nonchiral heavy quarks decaying to Wb. In this case, the results can be interpreted as upper limits on the production cross section times the branching fraction to Wb. (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:000312687700011
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213408]
专题	高能物理研究所_粒子天体物理中心
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	CMS Collaboration. Search for pair produced fourth-generation up-type quarks in pp collisions at root s=7 TeV with a lepton in the final state[J]. PHYSICS LETTERS B,2012,718(2):307-328.
APA	CMS Collaboration.(2012).Search for pair produced fourth-generation up-type quarks in pp collisions at root s=7 TeV with a lepton in the final state.PHYSICS LETTERS B,718(2),307-328.
MLA	CMS Collaboration."Search for pair produced fourth-generation up-type quarks in pp collisions at root s=7 TeV with a lepton in the final state".PHYSICS LETTERS B 718.2(2012):307-328.