Top quark pair production measurements in the single lepton channel using the ATLAS detector

Three measurements of top-quark pair production cross sections in proton-proton collisions at $\sqrt{s}$ = 13 TeV using data collected by the ATLAS experiment are presented. The single-lepton final states are used, where one electron or muon, two $b$-jets and two other jets can be identified. The inclusive $t\bar{t}$ production cross section is measured to be $\sigma_{t\bar{t}}$ = 817 $\pm$ 13 (stat.) $\pm$ 103 (syst.) $\pm$ 88 (lum.) pb, which is in good agreement with predictions and with other measurements. Absolute and relative differential cross sections of $t\bar{t}$ production are also measured, showing an overall good agreement with predictions, except for the top-quark transverse momentum distribution. As already reported in measurements at lower proton-proton collision energies, this distribution is shifted towards higher momenta in all predictions with respect to the observations. Total and differential fiducial cross sections of $t\bar{t}$ production in association with heavy-flavour jets are also presented. All tested models are found to agree with data within the uncertainties of these measurements.