Search for standard model production of four top quarks in proton–proton collisions at

doi:10.1016/j.physletb.2017.06.064

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	Search for standard model production of four top quarks in proton–proton collisions at
	CMS Collaboration
刊名	PHYSICS LETTERS B
	2017
卷号	772 页码:336-358
关键词	CMS Physics Top BSM
ISSN号	0370-2693
DOI	10.1016/j.physletb.2017.06.064
文献子类	Article
英文摘要	A search for events containing four top quarks (t (t) over bart (t) over bar) is reported from proton-proton collisions recorded by the CMS experiment at root s = 13 TeV and corresponding to an integrated luminosity of 2.6 fb(-1). The analysis considers the single-lepton (e or mu)+jets and the opposite-sign dilepton (mu(+)mu(-),mu +/- e -/+ , or e(+) e(-))+ jets channels. It uses boosted decision trees to combine information on the global event and jet properties to distinguish between t (t) over bart (t) over bar and t (t) over bar production. The number of events observed after all selection requirements is consistent with expectations from background and standard model signal predictions, and an upper limit is set on the cross section for t (t) over bart (t) over bar production in the standard model of 94 fb at 95% confidence level (10.2 x the prediction), with an expected limit of 118 fb. This is combined with the results from the published CMS search in the same-sign dilepton channel, resulting in an improved limit of 69 fb at 95% confidence level (7.4xthe prediction), with an expected limit of 71 fb. These are the strongest constraints on the rate of t (t) over bart (t) over bar production to date. (C) 2017 The Author(s). Published by Elsevier B.V.
电子版国际标准刊号	1873-2445
WOS关键词	CROSS-SECTION
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000411369700051
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284485]
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 standard model production of four top quarks in proton–proton collisions at[J]. PHYSICS LETTERS B,2017,772:336-358.
APA	CMS Collaboration.(2017).Search for standard model production of four top quarks in proton–proton collisions at.PHYSICS LETTERS B,772,336-358.
MLA	CMS Collaboration."Search for standard model production of four top quarks in proton–proton collisions at".PHYSICS LETTERS B 772(2017):336-358.