ATLAS Collab.
Measurement of the total and differential cross-sections of ttW production in pp collisions at √s=13 TeV with the ATLAS detector
Measurements of inclusive and differential production cross-sections of a top-quark-top-antiquark pair in association with a W boson (ttW) 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=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 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,αS) 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+ and ttW− is measured inclusively to be ArelC=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.