Abstract
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.
Original language | English |
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Article number | 052009 |
Number of pages | 36 |
Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
Volume | 99 |
Issue number | 5 |
DOIs | |
Publication status | Published - 26 Mar 2019 |
Bibliographical note
54 pages in total, author list starting page 38, 11 figures, 2 tables, submitted to Phys. Rev. D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2017-11Keywords
- hep-ex