Climbing to the Top of the ATLAS 13 TeV data

Abstract

The large amount of data recorded with the ATLAS detector at the Large HadronCollider, corresponding to 140 fb-1 of pp collisions at a centre-of-mass energy of SQUARE ROOTs = 13 TeV, has brought our knowledge of the top quark to a higher level. Themeasurement of the top-antitop quark pair-production cross-section has reached aprecision of 1.8% and the cross-section was measured differentially up to several TeVin multiple observables including the top-quark transverse momentum and top-quarkpairinvariant mass. Single-top-quark production was studied in all production modes.Rare production processes where the top quark is associated with a vector boson, andfour-top-quark production, have become accessible and cross-section measurementsfor several of these processes have reached uncertainties of around 10% or smaller.Innovative measurements of the top-quark mass and properties have also emerged,including the observation of quantum entanglement in the top-quark sector and tests oflepton-flavour universality using top-quark decays. Searches for flavour-changing neutralcurrents in the top-quark sector have been significantly improved, reaching branchingratioexclusion limits ranging from 10-3 to 10-5. Many of these analyses have been usedto set limits on Wilson coefficients within the effective field theory framework.