Direct top-quark decay width measurement at $\sqrt{s}=13$ TeV with the ATLAS experiment

Excellent performance of the LHC accelerator allows precise measurements of top quark properties. A direct measurement of the top-quark decay width is presented using full Run 2 dataset collected by the ATLAS detector at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of $139~\text{fb}^{-1}$. The measurement uses profile likelihood technique with multiple templates to minimize the impact of the systematic uncertainties.