Measurement of the top-quark mass in the $t\bar{t} \rightarrow \text{dilepton}$ channel with a template method, using the full Run 2 dataset in ATLAS

This document describes the top-quark mass measurement in top-quark pair production using the full Run~2 dataset collected with the ATLAS experiment at $\sqrt{s}$=13~TeV, which amounts to 139~$\text{fb}^{-1}$. The measurement is carried out in the dilepton channel. The top-quark mass is extracted from the observed invariant mass distribution of the pair of a charged-lepton and a $b$-tagged jet with the largest transverse momentum using an unbinned maximum-likelihood fit. The result is $m_{\text{top}} =$ 172.63 $\pm$ 0.20 (stat) $\pm$ 0.67 (syst) $\pm$ 0.37 (recoil) GeV. The statistical precision in the systematic uncertainty is 0.06 GeV.