The inclusive top quark pair (tt¯) production cross-section σt t¯ has been measured in proton–proton collisions at √s = 13 TeV, using 36.1 fb−1 of data collected in 2015–16 by the ATLAS experiment at the LHC. Using events with an opposite-charge eµ pair and b-tagged jets, the cross-section is measured to be: σt t¯ = 826.4 ± 3.6 (stat) ± 11.5 (syst) ± 15.7 (lumi) ± 1.9 (beam) pb, where the uncertainties are due to data statistics, experimental and theoretical systematic effects, the integrated luminosity, and the LHC beam energy, giving a total uncertainty of 2.4%. The result is consistent with theoretical QCD calculations. It is used to determine the top quark pole mass via the dependence of the predicted cross-section on mtpole, giving mtpole = 173.1+−22..01 GeV. It is also combined with measurements at √s = 7 TeV and √s = 8 TeV to derive ratios and double ratios of tt¯ and Z cross-sections at different energies. The same event sample is used to measure absolute and normalised differential cross-sections as functions of single-lepton and dilepton kinematic variables, and the results compared with predictions from various Monte Carlo event generators.
|Original language||English (US)|
|State||Published - Oct 19 2019|
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