First measurement of the top-quark pair production cross-section in pp collisions at centre-of-mass energy of 13.6 TeV with the ATLAS experiment at the LHC.

The inclusive top quark pair ($t\bar{t}$) production cross-section is measured in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13.6$ TeV, using the first data collected in 2022 during Run 3 by the ATLAS experiment at the LHC. The top-antitop cross-section is measured in both the dilepton and single-lepton final states of the $t\bar{t}$ system.