Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 TeV

doi:10.1007/JHEP02(2017)028

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	Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 TeV
	CMS Collaboration
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2017
期号	2 页码:28
关键词	Flavour Changing Neutral Currents Hadron-Hadron scattering (experiments) Top physics
ISSN号	1029-8479
DOI	10.1007/JHEP02(2017)028
文献子类	Article
英文摘要	Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb(-1), respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be vertical bar f (V) (R) vertical bar < 0.16,aEuro,vertical bar f (T) (L) vertical bar < 0.057, and - 0.049 < f (T) (R) < 0.048, respectively. For the FCNC couplings kappa (tug) and kappa (tcg), the 95% CL upper limits on coupling strengths are vertical bar kappa (tug)vertical bar/I > < 4.1 x 10(- 3) TeV-1 and vertical bar kappa (tcg)vertical bar/Lambda < 1.8 x 10(- 2) TeV-1, where I > is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 x 10(-5) and 4.1 x 10(-4) for the decays t -> ug and t -> cg, respectively.
WOS关键词	P(P)OVER-BAR COLLISIONS ; STANDARD-MODEL ; HIGGS ; POLARIZATION ; TEVATRON ; EVENTS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000394750000001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284343]
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 anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 TeV[J]. JOURNAL OF HIGH ENERGY PHYSICS,2017(2):28.
APA	CMS Collaboration.(2017).Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 TeV.JOURNAL OF HIGH ENERGY PHYSICS(2),28.
MLA	CMS Collaboration."Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 TeV".JOURNAL OF HIGH ENERGY PHYSICS .2(2017):28.