0619742 - FZÚ 2026 RIV DE eng J - Článek v odborném periodiku
Aad, G. - Aakvaag, E. - Abbott, B. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Nechanský, Filip - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … celkem 2899 autorů
Search for same-charge top-quark pair production in pp collisions at √s=13 TeV with the ATLAS detector.
Journal of High Energy Physics. Roč. 2025, č. 2 (2025), č. článku 084. ISSN 1029-8479. E-ISSN 1029-8479
Grant CEP: GA MŠMT(CZ) EH22_008/0004632
Výzkumná infrastruktura: CERN-CZ III - 90240
Institucionální podpora: RVO:68378271
Klíčová slova: Hadron-Hadron Scattering * ATLAS * CERN
Obor OECD: Particles and field physics
Impakt faktor: 5, rok: 2023 ; AIS: 0.998, rok: 2023
Způsob publikování: Open access
DOI: https://doi.org/10.1007/JHEP02(2025)084

A search for the production of top-quark pairs with the same electric charge (tt or tt‾) is presented. The analysis uses proton-proton collision data at √s ​ = 13 TeV, recorded by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb−1. Events with two same-charge leptons and at least two b-tagged jets are selected. Neural networks are employed to define two selections sensitive to additional couplings beyond the Standard Model that would enhance the production rate of same-sign top-quark pairs. No significant signal is observed, leading to an upper limit on the total production cross-section of same-sign top-quark pairs of 1.6 fb at 95% confidence level. Corresponding limits on the three Wilson coefficients associated with the Otu(1)​, OQu(1)​, and OQu(8)​ operators in the Standard Model Effective Field Theory framework are derived.
Trvalý link: https://hdl.handle.net/11104/0366396