Measurement of the total and differential cross-sections of t t ¯ W production in pp collisions at s = 13 TeV with the ATLAS detector

Journal article

Measurements of inclusive and differential production cross-sections of a top-quark-top-antiquark pair in association with a W boson (tt¯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 = 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 tt¯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, 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 tt¯W+ and tt¯W− is measured inclusively to be ACrel = 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.

Authors: Aad, G; Abbott, B; Abeling, K; Abicht, NJ; Abidi, SH

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Journal of High Energy Physics
• Volume: 2024
• Issue: 5
• Article number: 131
• Publication date: 2024-05-10
• Acceptance date: 2024-04-15
• DOI: 10.1007/jhep05(2024)131
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: Top Physics; Hadron-Hadron Scattering