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

Abraham, N L, Allbrooke, B M M, Asquith, L, Cerri, A, De Santo, A, Jones, S D, Salvatore, F, Shaw, K, Stevenson, T J, Suruliz, K, Sutton, M R, Tresoldi, F, Trovato, F, Vivarelli, I, Winkels, E, others, and The ATLAS Collaboration, (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, 99 (5). 052009. ISSN 2470-0010

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Abstract

A search for four-top-quark production, t¯tt¯t, 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: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Amelia Redman
Date Deposited: 16 Sep 2019 11:35
Last Modified: 19 Sep 2019 11:55
URI: http://sro.sussex.ac.uk/id/eprint/85784

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