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A measurement of the top quark-antiquark pair production cross section$\sigma_{\mathrm{t\overline{t}}}$ in proton-proton collisions at acentre-of-mass energy of 13 TeV is presented. The data correspond to anintegrated luminosity of 35.9 fb$^{-1}$, recorded by the CMS experiment at theCERN LHC in 2016. Dilepton events (e$^\pm\mu^\mp$, $\mu^+\mu^-$, e$^+$e$^-$)are selected and the cross section is measured from a likelihood fit. For a topquark mass parameter in the simulation of $m^{\mathrm{MC}}_{\mathrm{t}} =$172.5 GeV the fit yields a measured cross section$\sigma_{\mathrm{t\overline{t}}} =$ 803 $\pm$ 2 (stat) $\pm$ 25 (syst) $\pm$ 20(lumi) pb, in agreement with the expectation from the standard modelcalculation at next-to-next-to-leading order. A simultaneous fit of the crosssection and the top quark mass parameter in the POWHEG simulation is performed.The measured value of $m^{\mathrm{MC}}_{\mathrm{t}} =$ 172.33 $\pm$ 0.14 (stat)$^{+0.66}_{-0.72}$ (syst) GeV is in good agreement with previous measurements.The resulting cross section is used, together with the theoretical prediction,to determine the top quark mass and to extract a value of the strong couplingconstant with different sets of parton distribution functions.

european physical journal. c, particles and fields

Measurement of the $\mathrm{t}\overline{\mathrm{t}}$ production cross  section, the top quark mass, and the strong coupling constant using dilepton  events in pp collisions at $\sqrt{s} =$ 13 TeV