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The top-quark mass is measured in the all-hadronic top-antitop quark decaychannel using proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$= 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The data setused in the analysis corresponds to an integrated luminosity of 20.2 fb$^{-1}$.The large multi-jet background is modelled using a data-driven method. Thetop-quark mass is obtained from template fits to the ratio of the three-jet tothe dijet mass. The three-jet mass is obtained from the three jets assigned tothe top quark decay. From these three jets the dijet mass is obtained using thetwo jets assigned to the W boson decay. The top-quark mass is measured to be173.72 $\pm$ 0.55 (stat.) $\pm$ 1.01 (syst.) GeV.

Top-quark mass measurement in the all-hadronic $t\bar{t}$ decay channel at $\sqrt{s}$ = 8 TeV with the ATLAS detector