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

The ATLAS collaboration, S. J. Crawley, C. Haber, B. Mindur, A. A. Nepomuceno

Research output: Contribution to journalArticle

Abstract

Ratios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of s=13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given s for the two processes and at different s for each process, as well as double ratios of the two processes at different s, are evaluated. The ratios are constructed using previously published ATLAS measurements of the tt¯ and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z → ℓ+ where ℓ = e, μ at 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 → μ+μ channels for each s 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.[Figure not available: see fulltext.]

Original languageEnglish (US)
Article number117
JournalJournal of High Energy Physics
Volume2017
Issue number2
DOIs
StatePublished - Feb 1 2017

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bosons
quarks
detectors
cross sections
distribution functions
protons
partons
center of mass
luminosity
collisions
energy

Keywords

  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Measurements of top-quark pair to Z-boson cross-section ratios at √s=13 , 8, 7 TeV with the ATLAS detector. / The ATLAS collaboration; Crawley, S. J.; Haber, C.; Mindur, B.; Nepomuceno, A. A.

In: Journal of High Energy Physics, Vol. 2017, No. 2, 117, 01.02.2017.

Research output: Contribution to journalArticle

The ATLAS collaboration ; Crawley, S. J. ; Haber, C. ; Mindur, B. ; Nepomuceno, A. A. / Measurements of top-quark pair to Z-boson cross-section ratios at √s=13 , 8, 7 TeV with the ATLAS detector. In: Journal of High Energy Physics. 2017 ; Vol. 2017, No. 2.
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