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Measurement of the t(t)over-barW and t(t)over-barZ production cross sections in pp collisions at root s=8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2859
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 11, 172Article in journal (Refereed) PublishedText
Abstract [en]

The production cross sections of top-quark pairs in association with massive vector bosons have been measured using data from pp collisions at root s = 8 TeV. The dataset corresponds to an integrated luminosity of 20.3 fb(-1) collected by the ATLAS detector in 2012 at the LHC. Final states with two, three or four leptons are considered. A fit to the data considering the t (t) over barW and t (t) over barZ processes simultaneously yields a significance of 5.0 sigma (4.2 sigma) over the background-only hypothesis for t (t) over barW (t (t) over barZ) production. The measured cross sections are sigma(t (t) over barW) = 369(-91)(+100) fb and sigma(t (t) over barZ) = 176(-52)(+58) fb. The background-only hypothesis with neither t (t) over barW nor t (t) over barZ production is excluded at 7.1 sigma. All measurements are consistent with next-to-leading-order calculations for the t (t) over barW and t (t) over barZ processes.

Place, publisher, year, edition, pages
Springer, 2015. no 11, 172
Keyword [en]
Electroweak interaction, Hadron-Hadron scattering, Top physics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-180680DOI: 10.1007/JHEP11(2015)172ISI: 000366139900001ScopusID: 2-s2.0-84949438970OAI: oai:DiVA.org:kth-180680DiVA: diva2:895968
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QC 20160120

Available from: 2016-01-20 Created: 2016-01-20 Last updated: 2016-02-11Bibliographically approved

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Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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