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  • art%3A10.1007%2FJHEP11%282015%29172

    Rights statement: Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. Date of Acceptance: 03/11/2015. Evidence of Acceptance on Publisher PDF

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

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Article number172
<mark>Journal publication date</mark>24/11/2015
<mark>Journal</mark>Journal of High Energy Physics
Issue number11
Number of pages48
<mark>State</mark>Published
<mark>Original language</mark>English

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.