# Measurement of the tt̅ production cross section in pp collisions at √s=7  TeV in dilepton final states containing a τ

CMS Collaboration,; Chatrchyan, S; Khachatryan, V; Aguiló, E; Amsler, C; Chiochia, V; De Visscher, S; Favaro, C; Ivova Rikova, M; Millan Mejias, B; Otiougova, P; Robmann, P; Snoek, H; Tupputi, S; Verzetti, M (2012). Measurement of the tt̅ production cross section in pp collisions at √s=7 TeV in dilepton final states containing a τ. Physical Review D (Particles, Fields, Gravitation and Cosmology), 85(11):112007.

## Abstract

The top quark pair production cross section is measured in dilepton events with one electron or muon, and one hadronically decaying τ lepton from the decay tt̅ →(ℓνℓ)(τhντ)bb̅ , (ℓ=e,μ). The data sample corresponds to an integrated luminosity of 2.0  fb-1 for the electron channel and 2.2  fb-1 for the muon channel, collected by the CMS detector at the LHC. This is the first measurement of the tt̅ cross section explicitly including τ leptons in proton-proton collisions at √s=7  TeV. The measured value σtt̅ =143±14(stat)±22(syst)±3(lumi)  pb is consistent with the standard model predictions.

## Abstract

The top quark pair production cross section is measured in dilepton events with one electron or muon, and one hadronically decaying τ lepton from the decay tt̅ →(ℓνℓ)(τhντ)bb̅ , (ℓ=e,μ). The data sample corresponds to an integrated luminosity of 2.0  fb-1 for the electron channel and 2.2  fb-1 for the muon channel, collected by the CMS detector at the LHC. This is the first measurement of the tt̅ cross section explicitly including τ leptons in proton-proton collisions at √s=7  TeV. The measured value σtt̅ =143±14(stat)±22(syst)±3(lumi)  pb is consistent with the standard model predictions.

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