Inclusive and differential cross-sections for dilepton $t\overline{t}$ production measured in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector

Differential and double-differential distributions of kinematic variables of leptons from decays of top-quark pairs ( $t\overline{t}$ ) are measured using the full LHC Run 2 data sample collected with the ATLAS detector. The data were collected at a pp collision energy of $\sqrt{s}$ = 13 TeV and correspond to an integrated luminosity of 140 fb −1. The measurements use events containing an oppositely charged eμ pair and b-tagged jets. The results are compared with predictions from several Monte Carlo generators. While no prediction is found to be consistent with all distributions, a better agreement with measurements of the lepton p T distributions is obtained by reweighting the $t\overline{t}$ sample so as to reproduce the top-quark p T distribution from an NNLO calculation. The inclusive top-quark pair production cross-section is measured as well, both in a fiducial region and in the full phase-space. The total inclusive cross-section is found to be ${\sigma }_{t\overline{t}}=829±1\phantom{\rule{0.25em}{0ex}}\left(\text{stat}\right)±13\phantom{\rule{0.25em}{0ex}}\left(\text{syst}\right)±8\phantom{\rule{0.25em}{0ex}}\left(\text{lumi}\right)±2\phantom{\rule{0.25em}{0ex}}\left(\text{beam}\right)\phantom{\rule{0.25em}{0ex}}\mathrm{pb},$