Observation of four-top-quark production in the multilepton final state with the ATLAS detector
- NázevTitle
- Observation of four-top-quark production in the multilepton final state with the ATLAS detectorObservation of four-top-quark production in the multilepton final state with the ATLAS detector
- Druh výsledkuResult type
- Článek v časopiseJournal article
- AutořiAuthors
- G. Aad, B. Abbott, D. C. Abbott, A. A. Abud, B. Ali, K. Augsten, B. Bergmann, Z. Hubáček, M. Myška, R. Novotný, S. Pospíšil, K. Smolek, A. Sopczak, V. Vacek, P. Vokáč, S. Mondal, V. Petousis, T. Billoud, R. Polifka, O. Zaplatílek, P. Jačka
- Klíčová slovaKeywords
- lhc, atlas, top quark
- ExperimentCollaboration
- ATLAS
- DOIDOI
- 10.1140/epjc/s10052-023-11573-0
- Časopis / citaceJournal / citation
- The European Physical Journal C 83(6), 496 (2023) · ISSN 1434-6044
- RokYear
- 2023
- JazykLanguage
- eng
- ZáznamyRecords
- ProjektProject
- CERN-CZ III - Výzkumná infrastruktura pro experimenty v CERN - LM2023040 (2023–2026)CERN-CZ III - Výzkumná infrastruktura pro experimenty v CERN - LM2023040 (2023–2026); Centrum pokročilých aplikovaných přírodních vědCenter for advanced applied sciences
- CitovánoCited by
- 199 (INSPIRE-HEP)
- Plný text (open access)Full text (open access)
- https://link.springer.com/content/pdf/10.1140/epjc/s10052-023-11573-0.pdf
- Citace ke staženíDownload citation
- TXT · BibTeX
AbstraktAbstract
This paper presents the observation of four-topquark (t (t) over bart (t) over bar) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb-1 at a centre-of-mass energy of 13 TeVcollected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of themeasured t (t) over bart (t) over bar signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The t (t) over bart (t) over bar production cross section is measured to be 22.5(-5.5)(+6.6), consistent with the SM prediction of 12.0 +/- 2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect t (t) over bart (t) over bar production.
This paper presents the observation of four-topquark (t (t) over bart (t) over bar) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb-1 at a centre-of-mass energy of 13 TeVcollected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of themeasured t (t) over bart (t) over bar signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The t (t) over bart (t) over bar production cross section is measured to be 22.5(-5.5)(+6.6), consistent with the SM prediction of 12.0 +/- 2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect t (t) over bart (t) over bar production.