Measurement of the t ¯ t W and t ¯ t Z production cross sections in pp collisions at √s =8 TeV with the ATLAS detector

, The ATLAS collaboration (2015) Measurement of the t ¯ t W and t ¯ t Z production cross sections in pp collisions at √s =8 TeV with the ATLAS detector. Journal of High Energy Physics (11). ISSN 1029-8479

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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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
78045
Deposited By:
Deposited On:
28 Jan 2016 15:32
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Oct 2020 03:47