Search for flavor-changing neutral-current couplings between the top quark and the Z boson with proton-proton collisions at √s=13 TeV with the ATLAS detector

• Titel: Search for flavor-changing neutral-current couplings between the top quark and the Z boson with proton-proton collisions at √s=13 TeV with the ATLAS detector
• Mitwirkende: Aad, Georges [VerfasserIn]
• Mitwirkende: Baltes, Lisa Marie [VerfasserIn]
• Mitwirkende: Bartels, Falk [VerfasserIn]
• Mitwirkende: Castillo, Florencia Luciana [VerfasserIn]
• Mitwirkende: Czurylo, Marta [VerfasserIn]
• Mitwirkende: Dittmeier, Sebastian [VerfasserIn]
• Mitwirkende: Dunford, Monica [VerfasserIn]
• Mitwirkende: Franchino, Silvia [VerfasserIn]
• Mitwirkende: Klassen, Martin [VerfasserIn]
• Mitwirkende: Mkrtchyan, Tigran [VerfasserIn]
• Mitwirkende: Ott, Philipp [VerfasserIn]
• Mitwirkende: Rassloff, Damir Fabrice [VerfasserIn]
• Mitwirkende: Rodriguez Bosca, Sergi [VerfasserIn]
• Mitwirkende: Sauer, Christof [VerfasserIn]
• Mitwirkende: Schöning, André [VerfasserIn]
• Mitwirkende: Schultz-Coulon, Hans-Christian [VerfasserIn]
• Mitwirkende: Stamen, Rainer [VerfasserIn]
• Mitwirkende: Starovoitov, Pavel [VerfasserIn]
• Mitwirkende: Vigani, Luigi [VerfasserIn]
• Mitwirkende: Weber, Sebastian [VerfasserIn]
• Mitwirkende: Wessels, Martin [VerfasserIn]
• Mitwirkende: Zinßer, Joachim [VerfasserIn]
• Körperschaft: ATLAS Collaboration [VerfasserIn]
• Verf.angabe: G. Aad et al. (ATLAS Collaboration*)
• E-Jahr: 2023
• Jahr: 30 August 2023
• Umfang: 34 S.
• Illustrationen: Illustrationen
• Fussnoten: Veröffentlicht: 30. August 2023 ; *ATLAS Collaboration: G. Aad, L.M. Baltes, F. Bartels, F.L. Castillo, M.M. Czurylo, M. Dunford, S. Franchino, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H-C. Schultz-Coulon, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und 2883 weitere Personen] ; Im Titel steht der Buchstabe s unter dem Wurzelsymbol ; Gesehen am 16.05.2024
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Ridge, NY : American Physical Society, 2016
• Jahr Quelle: 2023
• Band/Heft Quelle: 108(2023), 3, Artikel-ID 032019, Seite 1-34
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.108.032019
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1888957131

Abstract

A search for flavor-changing neutral-current couplings between a top quark, an up or charm quark, and a Z boson is presented, using proton-proton collision data at √s=13 TeV collected by the ATLAS detector at the Large Hadron Collider. The analyzed data set corresponds to an integrated luminosity of 139 fb−1. The search targets both single-top-quark events produced as gq→tZ (with q=u, c) and top-quark-pair events, with one top quark decaying through the t→Zq channel. The analysis considers events with three leptons (electrons or muons), a b-tagged jet, possible additional jets, and missing transverse momentum. The data are found to be consistent with the background-only hypothesis and 95% confidence-level limits on the t→Zq branching ratios, assuming only tensor operators of the Standard Model effective field theory framework contribute to the tZq vertices. These are 6.2×10−5 (13×10−5) for t→Zu (t→Zc) for a left-handed tZq coupling, and 6.6×10−5 (12×10−5) in the case of a right-handed coupling. These results are interpreted as 95% CL upper limits on the strength of the corresponding couplings, yielding limits for |C(13)*uW| and |C(13)*uB| (|C(31)uW| and |C(31)uB|) of 0.15 (0.16), and limits for |C(23)*uW| and |C(23)*uB| (|C(32)uW| and |C(32)uB|) of 0.22 (0.21), assuming a new-physics energy scale ΛNP of 1 TeV.