CERN-LHC. The cross section of top quark pair production is measured in the dilepton final state with one tau lepton decaying hadronically.
The data sample corresponds to an integrated luminosity of 35.9 inverse femtobarns
collected in proton-proton collisions at sqrt(s) = 13 TeV in 2016 with the CMS detector.
The ratio of the cross sections in the lepton-tau and light dilepton final states
and the ratio of the partial width to the total decay width of the top quark are also measured.