Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in pp collisions at √s=13  TeV with the ATLAS detector

Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Mullier, Geoffrey André Adrien; Rimoldi, Marco; Weston, Thomas Daniel (2019). Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in pp collisions at √s=13  TeV with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, 99(5) American Physical Society 10.1103/PhysRevD.99.052009

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A search for four-top-quark production, tt¯tt¯, is presented. It is based on proton-proton collision data with a center-of-mass energy √s=13  TeV collected by the ATLAS detector at the Large Hadron Collider during the years 2015 and 2016, corresponding to an integrated luminosity of 36.1  fb−1. Data are analyzed in both the single-lepton and opposite-sign dilepton channels, characterized by the presence of one or two isolated electrons or muons with high-transverse momentum and multiple jets. A data-driven method is used to estimate the dominant background from top-quark pair production in association with jets. No significant excess above the Standard Model expectation is observed. The result is combined with the previous same-sign dilepton and multilepton searches carried out by the ATLAS Collaboration and an observed (expected) upper limit of 5.3 (2.1) times the four-top-quark Standard Model cross section is obtained at 95% confidence level. Additionally, an upper limit on the anomalous four-top-quark production cross section is set in the context of an effective field theory model.

Item Type:

Journal Article (Original Article)


10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Miucci, Antonio, Merlassino, Claudia, Haug, Sigve, Weber, Michele, Anders, John Kenneth, Beck, Hans Peter, Ereditato, Antonio, Mullier, Geoffrey André Adrien, Rimoldi, Marco, Weston, Thomas Daniel


500 Science > 530 Physics




American Physical Society





Date Deposited:

18 Jun 2020 16:39

Last Modified:

05 Dec 2022 15:38

Publisher DOI:


Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt; ATLAS collaboration




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