Latest measurements of the top quark pair production cross-section with the ATLAS detector

Three recent measurements of the top quark pair production cross-section $\sigma(t\bar{t})$ by the ATLAS Collaboration are summarised: the measurement of the inclusive $\sigma(t\bar{t})$ performed using proton-proton collisions at $\sqrt{s} = 5.02$ TeV in the single-lepton and dilepton final states and their combination, the measurement of the differential $\sigma(t\bar{t})$ using boosted top quarks in the all-hadronic final state at $\sqrt{s} = 13$ TeV, and the measurement of the differential $\sigma(t\bar{t})$ using boosted top quark pair events in the lepton+jets channel at $\sqrt{s} = 13$ TeV. All the results were found to be in agreement with theoretical quantum chromodynamic calculations. The differential measurement results are compared with various Monte Carlo generators, including comparisons where the generators are reweighted to match a parton-level calculation at next-to-next-to-leading order. The reweighting improves the agreement between data and theory.