The cross section of top quark pair production is measured in the tt → (ℓvℓ) (τhvτ)bb final state, where τhrefers to the hadronic decays of the τ lepton, and ℓ is either an electron or a muon. The data sample corresponds to an integrated luminosity of 35.9 fb-1collected in proton-proton collisions at √s = 13 TeV with the CMS detector. The measured cross section is <% = 781 ± 7 (stat) ± 62 (syst) ± 20 (lumi) pb, and the ratio of the partial width Σ(t → τvτb) to the total decay width of the top quark is measured to be 0.1050 ± 0.0009 (stat) ± 0.0071 (syst). This is the first measurement of the tt production cross section in proton-proton collisions at √s = 13 TeV that explicitly includes τ leptons. The ratio of the cross sections in the ℓτhand ℓℓ final states yields a value Rℓτh/ℓℓ= 0.973 ± 0.009 (stat) ± 0.066 (syst), consistent with lepton universality.
|Publication status||Published - 2019 Nov 29|
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