Measurement of the W boson polarization in top quark decays with the ATLAS detector

	Measurement of the W boson polarization in top quark decays with the ATLAS detector
	ATLAS collaboration
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2012
期号	6
关键词	ANOMALOUS WTB COUPLINGS COLLISIONS LHC TEV
通讯作者	Aad, G (reprint author), Univ Freiburg, Fak Math & Phys, Hugstetter Str 55, D-79106 Freiburg, Germany.
英文摘要	This paper presents measurements of the polarization of W bosons in top quark decays, derived from t (t) over bar events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb(-1). The measured fractions of longitudinally, left-and right-handed polarization are F-0 = 0.67 +/- 0.07, F-L = 0.32 +/- 0.04 and F-R = 0.01 +/- 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.
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:000306416500089
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213284]
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. Measurement of the W boson polarization in top quark decays with the ATLAS detector[J]. JOURNAL OF HIGH ENERGY PHYSICS,2012(6).
APA	ATLAS collaboration.(2012).Measurement of the W boson polarization in top quark decays with the ATLAS detector.JOURNAL OF HIGH ENERGY PHYSICS(6).
MLA	ATLAS collaboration."Measurement of the W boson polarization in top quark decays with the ATLAS detector".JOURNAL OF HIGH ENERGY PHYSICS .6(2012).