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https://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: | The 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. |
DOI: | 10.1007/JHEP11(2015)172 |
Published version: | http://dx.doi.org/10.1007/jhep11(2015)172 |
Appears in Collections: | Aurora harvest 3 Physics publications |
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hdl_115080.pdf | Published version | 1.86 MB | Adobe PDF | View/Open |
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