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 t tbar W j_(EW) 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-1 at root(s) = 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 t tbar W j(EW) production process from its strong t tbar W production counterpart. A measured (expected) 95% CL upper limit on the cross section is set at sigma(t tbar W j(EW)) < 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_(Ht) and O^1_(HQ), 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.

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. ., et al. (2026). Search for electroweak t tbar W j production in multileptonic final states at root(s) = 13 TeV with the ATLAS detector and bounds on effective field theory operators. PHYSICAL REVIEW D, 114(1) [10.1103/p5nz-95m3].

Search for electroweak t tbar W j production in multileptonic final states at root(s) = 13 TeV with the ATLAS detector and bounds on effective field theory operators

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

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 t tbar W j_(EW) 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-1 at root(s) = 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 t tbar W j(EW) production process from its strong t tbar W production counterpart. A measured (expected) 95% CL upper limit on the cross section is set at sigma(t tbar W j(EW)) < 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_(Ht) and O^1_(HQ), 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.
2026
Pubblicato
Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. ., et al. (2026). Search for electroweak t tbar W j production in multileptonic final states at root(s) = 13 TeV with the ATLAS detector and bounds on effective field theory operators. PHYSICAL REVIEW D, 114(1) [10.1103/p5nz-95m3].
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, N ; Abidi, S ; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Acharya, B ;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/468946
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