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Measurement of the tt Z¯ and ttW¯ production cross sections in multilepton final states using 3.2 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector

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ATLAS Collaboration (Including: Beckingham, M., Ennis, Joseph Stanford, Farrington, Sinead, Harrison, P. F., Jeske, C., Jones, G., Martin, T. A., Murray, W., Pianori, E. and Spangenberg, Martin). (2017) Measurement of the tt Z¯ and ttW¯ production cross sections in multilepton final states using 3.2 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector. The European Physical Journal C, 77 (40). doi:10.1140/epjc/s10052-016-4574-y ISSN 1434-6044.

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Official URL: http://dx.doi.org/10.1140/epjc/s10052-016-4574-y

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Abstract

A measurement of the tt¯Ztt¯Z and tt¯Wtt¯W production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of proton–proton collisions at s√=13s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated luminosity of 3.2 fb −1−1. The inclusive cross sections are extracted using likelihood fits to signal and control regions, resulting in σtt¯Z=0.9±0.3σtt¯Z=0.9±0.3 pb and σtt¯W=1.5±0.8σtt¯W=1.5±0.8 pb, in agreement with the Standard Model predictions.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: The European Physical Journal C
Publisher: Springer
ISSN: 1434-6044
Official Date: 20 January 2017
Dates:
DateEvent
20 January 2017Published
13 December 2016Accepted
Volume: 77
Number: 40
DOI: 10.1140/epjc/s10052-016-4574-y
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)

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