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Title

Measurement of the t t ¯ W and t t ¯ Z production cross sections in pp collisions at √s = 8 TeV with the ATLAS detector
CollaborationWith : Ancu, Lucian Stefan / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Calace, Noemi / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nessi, Marzio / Paolozzi, Lorenzo / Picazio, Attilio / Ristic, Branislav / Schramm, Steven / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2015, vol. 1511, p. 172-220
Collection Open Access - SCOAP3
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 t t ¯ W and t t ¯ Z processes simultaneously yields a significance of 5.0 σ (4.2 σ ) over the background-only hypothesis for t t ¯ W ( t t ¯ Z ) production. The measured cross sections are σ t t ¯ W = 369 − 91 + 100 fb and σ t t ¯ Z = 176 − 52 + 58 fb. The background-only hypothesis with neither t t ¯ W production is excluded at 7.1 σ . All measurements are consistent with next-to-leading-order calculations for the t t ¯ W and t t ¯ Z processes.
Keywords Electroweak interaction — Hadron-Hadron scattering — Top physics
Identifiers
arXiv: 1509.05276
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Article (Published version) - public document Free access
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Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire
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(ISO format) 		ATLAS COLLABORATION. Measurement of the t t ¯ W and t t ¯ Z production cross sections in pp collisions at √s = 8 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2015, vol. 1511, p. 172-220. doi: 10.1007/JHEP11(2015)172 https://archive-ouverte.unige.ch/unige:79083

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Deposited on : 2016-01-11

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