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The inclusive $t\bar{t}$ production cross-section is measured in thelepton+jets channel using 20.2 fb$^{-1}$ of proton--proton collision data at acentre-of-mass energy of 8 TeV recorded with the ATLAS detector at the LHC.Major systematic uncertainties due to the modelling of the jet energy scale and$b$-tagging efficiency are constrained by separating selected events into threedisjoint regions. In order to reduce systematic uncertainties in the mostimportant background, the W+jets process is modelled using Z+jets events in adata-based approach. The inclusive $t\bar{t}$ cross-section is measured with aprecision of 5.7% to be $\sigma_{t\bar{t}} = 248.3 \pm 0.7 \, (\mathrm{stat.})\pm 13.4 \, (\mathrm{syst.}) \pm 4.7 \, (\mathrm{lumi.})~\text{pb}$, assuming atop-quark mass of 172.5 GeV. The result is in agreement with the Standard Modelprediction.

Measurement of the inclusive $t\bar{t}$ cross-section in the lepton+jets channel in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector