Search for electroweak tt̄Wj production in multileptonic final states at (Formula presented) = 13 TeV with the ATLAS detector and bounds on effective field theory operators
Physical Review D, cilt.114, sa.1, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 114 Sayı: 1
- Basım Tarihi: 2026
- Doi Numarası: 10.1103/p5nz-95m3
- Dergi Adı: Physical Review D
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, INSPEC, MathSciNet, zbMATH
- Ankara Üniversitesi Adresli: Evet
Özet
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 tt̄WjEW 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 (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 tt̄WjEW production process from its strong tt̄W production counterpart. A measured (expected) 95% CL upper limit on the cross section is set at σtt̄WjEW < 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 OHt and OHQ ð1Þ, 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.