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 ttW¯ and ttZ¯ processes simultaneously yields a significance of 5.0σ
(4.2σ) over the background-only hypothesis for ttW¯ (ttZ¯ ) production. The measured cross
sections are σttW¯ = 369+100
−91 fb and σttZ¯ = 176+58
−52 fb. The background-only hypothesis with
neither ttW¯ nor ttZ¯ production is excluded at 7.1σ. All measurements are consistent with
next-to-leading-order calculations for the ttW¯ and ttZ¯ processes.
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 ttW¯ and ttZ¯ processes simultaneously yields a significance of 5.0σ
(4.2σ) over the background-only hypothesis for ttW¯ (ttZ¯ ) production. The measured cross
sections are σttW¯ = 369+100
−91 fb and σttZ¯ = 176+58
−52 fb. The background-only hypothesis with
neither ttW¯ nor ttZ¯ production is excluded at 7.1σ. All measurements are consistent with
next-to-leading-order calculations for the ttW¯ and ttZ¯ processes.
| Original language | English (US) |
|---|---|
| Journal | Sussex Research Online |
| DOIs | |
| State | Published - 2015 |