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Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 28222017 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2017, no 2, article id 117Article in journal (Refereed) Published
Abstract [en]

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.]

Place, publisher, year, edition, pages
Springer, 2017. Vol. 2017, no 2, article id 117
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Physical Sciences
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URN: urn:nbn:se:kth:diva-209043DOI: 10.1007/JHEP02(2017)117ISI: 000395022700001Scopus ID: 2-s2.0-85016562530OAI: oai:DiVA.org:kth-209043DiVA, id: diva2:1110001
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QC 20170615

Available from: 2017-06-15 Created: 2017-06-15 Last updated: 2019-12-04Bibliographically approved

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Kastanas, KonstatinosLund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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