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	Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector
	Aaboud, M.197,198; Aad, G.127,128; Abbott, B.159; Abdallah, J.11; Abdinov, O.15; Abeloos, B.163; Abidi, S. H.229; AbouZeid, O. S.201; Abraham, N. L.218; Abramowicz, H.222
刊名	Journal of high energy physics
	2017-12-04
期号	12页码:60
关键词	Electroweak interaction Hadron-hadron scattering (experiments) Top physics
ISSN号	1029-8479
DOI	10.1007/jhep12(2017)017
通讯作者	Aaboud, m.(atlas.publications@cern.ch)
英文摘要	The electroweak production and subsequent decay of single top quarks in the t-channel is determined by the properties of the wtb vertex, which can be described by the complex parameters of an effective lagrangian. an analysis of a triple-differential decay rate in t-channel production is used to simultaneously determine five generalised helicity fractions and phases, as well as the polarisation of the produced top quark. the complex parameters are then constrained. this analysis is based on 20.2 fb(-1) of proton-proton collision data at a centre-of-mass energy of 8 tev collected with the atlas detector at the lhc. the fraction of decays containing transversely polarised w bosons is measured to be f(1) = 0.30 +/- 0.05. the phase between amplitudes for transversely and longitudinally polarised w bosons recoiling against left-handed b-quarks is measured to be delta = 0.002 pi(+0.016 pi)(+0.017 pi), giving no indication of cp violation. the fractions of longitudinal or transverse w bosons accompanied by right-handed b-quarks are also constrained. based on these measurements, limits are placed at 95% cl on the ratio of the complex coupling parameters re [g(r)/v-l is an element of [-0.12, 0.17] and im [g(r)/v-l is an element of [-0.07, 0.06]. constraints are also placed on the ratios vertical bar v-r/v-l vertical bar and vertical bar g(l)/v-l vertical bar. in addition, the polarisation of single top quarks in the t-channel is constrained to be p > 0.72 (95% cl). none of the above measurements make assumptions about the value of any of the other parameters or couplings and all of them are in agreement with the standard model.
WOS关键词	HADRON COLLIDERS ; PARTON DISTRIBUTIONS ; PAIR PRODUCTION ; HEAVY QUARKS ; MONTE-CARLO ; SPIN ; LHC ; POLARIZATION ; QCD
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:000417756900002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2177845
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, Phys Dept, Albany, NY 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, High Energy Phys Div, 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. Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector[J]. Journal of high energy physics,2017(12):60.
APA	Aaboud, M..,Aad, G..,Abbott, B..,Abdallah, J..,Abdinov, O..,...&Haleem, M..(2017).Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector.Journal of high energy physics(12),60.
MLA	Aaboud, M.,et al."Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector".Journal of high energy physics .12(2017):60.

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