Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector

doi:10.1007/JHEP02(2017)117

	Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector
	ATLAS Collaboration
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2017
期号	2 页码:117
关键词	Hadron-Hadron scattering (experiments)
ISSN号	1029-8479
DOI	10.1007/JHEP02(2017)117
文献子类	Article
英文摘要	Ratios of top-quark pair to Z-boson cross sections measured from proton-proton-collisions at the LHC centre-of-mass energies of root S = 13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given root S for the two processes and at different root S , for each process, as well as double ratios of the two processes at different root S , are evaluated. The ratios are constructed using previously published ATLAS measurements of the t (t) over bar and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z -> l(+)l(-) where l = e, mu at root S = 13 TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb(-1). Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the Z -> e (+) e (-) and the Z -> mu (+) mu (-) channels for each value. The results are compared to calculations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate significant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the light-quark sea for x < 0.02.
WOS关键词	PARTON DISTRIBUTIONS ; HADRON COLLIDERS ; QCD ANALYSIS ; PLUS PLUS ; RESUMMATION ; DECAY ; LHC
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000395022700001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284412]
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. Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector[J]. JOURNAL OF HIGH ENERGY PHYSICS,2017(2):117.
APA	ATLAS Collaboration.(2017).Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector.JOURNAL OF HIGH ENERGY PHYSICS(2),117.
MLA	ATLAS Collaboration."Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector".JOURNAL OF HIGH ENERGY PHYSICS .2(2017):117.