Search for electroweak t(t)over-barWj production in multileptonic final states at √s=13 TeV with the ATLAS detector and bounds on effective field theory operators



Aad, G, Aakvaag, E, Abbott, B, Abdelhameed, S, Abeling, K, Abicht, NJ, Abidi, SH, Aboelela, M, Aboulhorma, A, Abramowicz, H
et al (show 2862 more authors) (2026) Search for electroweak t(t)over-barWj production in multileptonic final states at √s=13 TeV with the ATLAS detector and bounds on effective field theory operators PHYSICAL REVIEW D, 114 (1). 012001-. ISSN 2470-0010, 2470-0029

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Abstract

A search is presented for the electroweak production of a top-quark pair in association with a W boson and at least one additional jet known as the tt̄Wj<inf>EW</inf> process. This process has embedded within it a tW-scattering vertex, which is probed directly for the first time. The collision data were collected with the ATLAS detector during Run 2 of the LHC and correspond to an integrated luminosity of 140 fb<sup>−1</sup> at (Formula presented) ¼ 13 TeV. The search uses same-charge pairs of electrons and muons together with jets, of which at least one is b-tagged. The properties of the most forward jet relative to the rest of the event are used to discriminate the electroweak tt̄Wj<inf>EW</inf> production process from its strong tt̄W production counterpart. A measured (expected) 95% CL upper limit on the cross section is set at σ<inf>tt̄WjEW</inf> < 251 fb (230 fb), to be compared with the expected Standard Model (SM) cross section of 47.7 fb. Limits are set on the SM effective field theory (EFT) operators O<inf>Ht</inf> and O<inf>HQ</inf> <sup>ð</sup>1<sup>Þ</sup>, which modify the electroweak couplings of the top quark through contributions to the tW-scattering vertex. The interpretation acts as a case study to emphasize the importance of energy-dependent sensitivity, multiprocess, and multioperator EFT contributions.

Item Type: Article
Uncontrolled Keywords: 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science & Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Depositing User: Symplectic Admin
Date Deposited: 27 Jul 2026 07:50
Last Modified: 14 Oct 2026 10:23
DOI: 10.1103/p5nz-95m3
Open Access URL: https://journals.aps.org/prd/abstract/10.1103/p5nz...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3199548
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