Measurements of the top quarks mass with the ATLAS Experiment

Three measurements of the mass of the top quark in proton-proton collision at the LHC performed with the ATLAS detector are presented. Two of them employ the decay mode where one of the pair-produced top quarks decays in either a electron or a muon and the other one into jets while the fourth measurements is performed in the decay mode where both top quarks decay into jets. Finally a combination of two of the measurements is presented which gives the final result of $m_\text{top}=\unit[174.5\pm0.6_\text{stat.}\pm2.3_\text{syst.}]{\GeV}$.