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	Measurement of the w boson polarisation in t(t)over-barevents from pp collisions at root s=8 tev in the lepton plus jets channel with atlas
	Aaboud, M.194,195; Aad, G.124,125; Abbott, B.156; Abdallah, J.11; Abdinov, O.15; Abeloos, B.160; AbouZeid, O. S.198; Abraham, N. L.215; Abramowicz, H.219; Abreu, H.218
刊名	European physical journal c
	2017-04-11
卷号	77期号:4页码:28
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-017-4819-4
通讯作者	Aaboud, m.()
英文摘要	This paper presents a measurement of the polarisation of w bosons from t (t) over bar t decays, reconstructed in events with one high-p(t) lepton and at least four jets. data from pp collisions at the lhc were collected at root s = 8 tev and correspond to an integrated luminosity of 20.2 fb(-1). the angle theta* between the b-quark from the top quark decay and a direct w boson decay product in the w boson rest frame is sensitive to the w boson polarisation. two different w decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying w boson, respectively. the most precise measurement of the w boson polarisation via the distribution of cos theta* is obtained using the leptonic analyser and events in which at least two of the jets are tagged as b-quark jets. the fitted fractions of longitudinal, left-and right-handed polarisation states are f-0 = 0.709 +/- 0.019, f-l = 0.299 +/- 0.015 and f-r = - 0.008 +/- 0.014, and are the most precisely measured w boson polarisation fractions to date. limits on anomalous couplings of the w tb vertex are set.
WOS关键词	TOP-QUARK PRODUCTION ; PARTON DISTRIBUTIONS ; HADRON COLLIDERS ; PAIR PRODUCTION ; RESUMMATION ; LHC
WOS研究方向	Physics
WOS类目	Physics, Particles & Fields
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000400235900001
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2177431
专题	高能物理研究所
通讯作者	Aaboud, M.
作者单位	1.Univ Adelaide, Dept Phys, Adelaide, SA, Australia 2.SUNY Albany, Dept Phys, Albany, NY 12222 USA 3.Univ Alberta, Dept Phys, Edmonton, AB, Canada 4.Ankara Univ, Dept Phys, Ankara, Turkey 5.Istanbul Aydin Univ, Istanbul, Turkey 6.TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey 7.CNRS, IN2P3, LAPP, Annecy Le Vieux, France 8.Univ Savoie Mt Blanc, Annecy Le Vieux, France 9.Argonne Natl Lab, Div High Energy Phys, Argonne, IL USA 10.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
推荐引用方式 GB/T 7714	Aaboud, M.,Aad, G.,Abbott, B.,et al. Measurement of the w boson polarisation in t(t)over-barevents from pp collisions at root s=8 tev in the lepton plus jets channel with atlas[J]. European physical journal c,2017,77(4):28.
APA	Aaboud, M..,Aad, G..,Abbott, B..,Abdallah, J..,Abdinov, O..,...&Han, S..(2017).Measurement of the w boson polarisation in t(t)over-barevents from pp collisions at root s=8 tev in the lepton plus jets channel with atlas.European physical journal c,77(4),28.
MLA	Aaboud, M.,et al."Measurement of the w boson polarisation in t(t)over-barevents from pp collisions at root s=8 tev in the lepton plus jets channel with atlas".European physical journal c 77.4(2017):28.

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