Highlights of top quark properties measurements with the ATLAS detector

Highlights of top quark properties measurements with the ATLAS detector The top-quark mass is an important fundamental parameter of the Standard Model, since higher-order corrections involving top quarks have a large impact due to the high value of the top-quark mass. A new measurement of the top-quark mass is presented. The analysis is based on top-quark-antiquark pair events in which a soft muon is reconstructed which originates in a large fraction of the cases from the b hadron from top-quark decay. This measurement method is less sensitive to the jet energy calibration and has therefore different systematic uncertainties than conventional measurements. In addition, a recent measurement of the top-quark width in the di-lepton channel is shown. This measurement uses the full Run 2 data set. The top quark is the heaviest known fundamental particle. As it is the only quark that decays before it hadronizes, this gives the unique opportunity to probe the properties of bare quarks. This talk will highlight a recent precision measurement of the charge asymmetry in top-quark pair production by the strong interaction which manifests itself as a central-forward asymmetry in proton-proton collisions at the Large Hadron Collider. In addition, the talk will cover a recent combination of ATLAS and CMS measurements of the polarisation of W bosons from top-quark decay.