Precision measurements of top-quark couplings and cross sections with the ATLAS detector at the LHC

The Standard Model of particle physics (SM) connects symmetries to the interactions of elementary particles. Effective field theories (EFT) extend the SM with higher-dimension operators that maintain the SM’s symmetries in the low-energy limit. The high center-of-mass energy of proton-proton collisions and the high integrated luminosities at the CERN Large Hadron Collider allows to use the large sample of top quark events to test SM theoretical predictions and constrain the effects of EFT operators with unprecedented sensitivity. Using data taken with the ATLAS detector at the LHC, recent measurements of the associated production of top quarks with Z bosons, photons and an additional top-quark pair (4-top production), a recent search for flavor-changing interactions of the top quark and the Z boson, as well as recent precision measurements of top-quark processes are presented that constrain EFT operators via observables related to the polarization of single-top-quark events, the transverse momentum of high-momentum top quarks in top-quark pair production and the energy asymmetry in top-quark pair production events with an additional jet.