Key points are not available for this paper at this time.
A bstract Measurements of inclusive and differential production cross-sections of a top-quark-top-antiquark pair in association with a W boson (ttW t t ¯ W) are presented. They are performed by targeting final states with two same-sign or three isolated leptons (electrons or muons) and are based on s s = 13 TeV proton-proton collision data with an integrated luminosity of 140 fb − 1, recorded from 2015 to 2018 with the ATLAS detector at the Large Hadron Collider. The inclusive ttW t t ¯ W production cross-section is measured to be 880 ± 80 fb, compared to a reference theoretical prediction of 745 ± 50 (scale) ± 13 (2-loop approx. ) ± 19 (PDF, α s) fb. Differential cross-section measurements characterise this process in detail for the first time. Several particle-level observables are compared with a variety of theoretical predictions, which generally agree well with the normalised differential cross-section results. Additionally, the relative charge asymmetry of ttW^+ t t ¯ W + and ttW^- t t ¯ W − is measured inclusively to be A₂^rel A C rel = 0. 33 ± 0. 05, in very good agreement with the theoretical prediction of 0. 322 ± 0. 003 (scale) ± 0. 007 (PDF), as well as differentially.
Aad et al. (Fri,) studied this question.