Top properties and mass measurements with the ATLAS detector

Abstract: The top quark is unique among the known quarks in that it decays before it has an opportunity to form hadronic bound states. This makes measurements of its properties particularly interesting as one can access directly the properties of a bare quark. The latest measurements of these properties are presented. Measurements of the charge asymmetry in top-quark pairs, which probe models of physics beyond the Standard Model, are presented; these include measurements at high invariant masses of the ttbar system using boosted top quarks. Measurements of the top polarization produced either through pair process or through single top process are discussed. The helicity of the W boson from the top decays and the production angles of the top quark are further discussed. Limits on the rate of flavor-changing neutral currents in the production or decay of the top quark are discussed. The latest ATLAS measurements of the top quark mass are also presented. A measurement using lepton+jets events is presented, where a multi-dimensional template fit is used to constrain the uncertainties on the energy measurements of jets. The measurements using dilepton and all-hadronic events are also discussed. In addition, measurements aiming to measure the mass in a well-defined scheme are presented like the measurement using ttbar production with an additional jet to extract the top quark mass in the pole-mass scheme.