Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/115080
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Type: Journal article
Title: Measurement of the tt¯W and tt¯Z production cross sections in pp collisions at √s = 8 TeV with the ATLAS detector
Other Titles: Measurement of the tt -barW and tt -barZ production cross sections in pp collisions at s root=8 TeV with the ATLAS detector
Author: The, A.C.
Aad, G.
Abbott, B.
Abdallah, J.
Abdinov, O.
Aben, R.
Abolins, M.
AbouZeid, O.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
Affolder, A.
Agatonovic-Jovin, T.
et al.
Citation: Journal of High Energy Physics, 2015; 2015(11):172-1-172-48
Publisher: Springer
Issue Date: 2015
ISSN: 1126-6708
1029-8479
Statement of
Responsibility: 
G. Aad ... Paul D. Jackson … Lawrence Lee-Jr … Andreas Petridis … Nitesh Soni … Martin White … et al. (ATLAS Collaboration)
Abstract: The production cross sections of top-quark pairs in association with massive vector bosons have been measured using data from pp collisions at 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 tt¯W and tt¯Z processes simultaneously yields a significance of 5.0σ (4.2σ) over the background-only hypothesis for tt¯W (tt¯Z) production. The measured cross sections are σtt¯W=369+100−91 fb and σtt¯Z=176+58−52 fb. The background-only hypothesis with neither tt¯W nor tt¯Z production is excluded at 7.1σ. All measurements are consistent with next-to-leading-order calculations for the tt¯W and tt¯Z processes.
Keywords: Electroweak interaction; Hadron-Hadron scattering; top physics
Rights: © The Author(s) 2015. This article is published under an open access license. Please check the 'Copyright Information' section for details of this license and what re-use is permitted. If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and re-use information, please contact the Rights and Permissions team.
RMID: 0030040736
DOI: 10.1007/JHEP11(2015)172
Appears in Collections:Physics publications

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