Abstract
Highlights of the most recent top-quark measurements obtained using the full data set collected with the ATLAS experiment at the LHC at a centre-of-mass energy of 13 TeV, corresponding to 139 fb−1 of integrated luminosity, are presented. The results include inclusive and differential cross-section measurements of the production of top-quark pairs in association with a photon or a Z boson, the first evidence of four-top-quark production and a novel measurement of lepton flavour universality in top-quark topologies.
Highlights
Dominant backgrounds: WZ /ZZ +light jets Profile likelihood fit based on the event yields in each region σfid = 1.05 ± 0.05(stat) ± 0.09(syst) pb ∼10% precision σNLO+NLL = 0.86+−00..0079 ± 0.03 (PDF + αS ) pb [JHEP 08 (2019) 039]
Signal region: at least 6 jets and at least 2-bjets, HT >500 GeV Main backgrounds: tt + Z /H+jets: MC estimate ttW and non-prompt backgrounds: normalisations determined in CRs
Most precise measurement of R(τ /μ): Lepton flavour universality in agreement with the SM
Summary
This talk focuses on some of the most recent top quark (+ friends) results by ATLAS with the full Run-2 13 TeV data. Studying processes with 0(5) of magnitude difference in production rate Plethora of measurements available: top-quark properties production/decays, associated production, couplings,
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