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The cross section of top quark pair production is measured in the$\mathrm{t\bar{t}}$ $\to$$(\ell\nu_{\ell})(\tau_\mathrm{h}\nu_{\tau})\mathrm{b\bar{b}}$ final state,where $\tau_\mathrm{h}$ refers to the hadronic decays of the $\tau$ lepton, and$\ell$ is either an electron or a muon. The data sample corresponds to anintegrated luminosity of 35.9 fb$^{-1}$ collected in proton-proton collisionsat $\sqrt{s} =$ 13 TeV with the CMS detector. The measured cross section is$\sigma_{\mathrm{t\bar{t}}} =$ 781 $\pm$ 7 (stat) $\pm$ 62 (syst) $\pm$ 20(lum) pb, and the ratio of the partial width $\Gamma($t $\to$$\tau\nu_{\tau}$b) to the total decay width of the top quark is measured to be0.1050 $\pm$ 0.0009 (stat) $\pm$ 0.0071 (syst). This is the first measurementof the $\mathrm{t\bar{t}}$ production cross section in proton-proton collisionsat $\sqrt{s} =$ 13 TeV that explicitly includes $\tau$ leptons. The ratio ofthe cross sections in the $\ell\tau_\mathrm{h}$ and $\ell\ell$ final statesyields a value $R_{\ell\tau_\mathrm{h}/\ell\ell} =$ 0.973 $\pm$ 0.009 (stat)$\pm$ 0.066 (syst), consistent with lepton universality.

the journal of high energy physics/the journal of high energy physics

Measurement of the top quark pair production cross section in dilepton  final states containing one $\tau$ lepton in pp collisions at $\sqrt{s} =$ 13  TeV