The top-quark pair production cross section is measured in final states with one electron or muon
and one hadronically decaying τ lepton from the process tt → ( ν )(τντ )bb, where = e,μ. The data
sample corresponds to an integrated luminosity of 19.6 fb−1 collected with the CMS detector in proton–
proton collisions at √s = 8 TeV. The measured cross section σtt = 257±3 (stat)±24 (syst)±7 (lumi) pb,
assuming a top-quark mass of 172.5 GeV, is consistent with the standard model prediction.