Measurement of the top quark pair cross section with ATLAS in pp collisions at sqrt(s) = 7 TeV using final states with an electron or a muon and a hadronically decaying tau lepton

The ATLAS Collaboration;Aad, Georges;Jez, Pavel;Tanasijczuk, Andres Jorge;et.al.
(2012) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 717, n° 1-3, p. 89-108 (2012)

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A measurement of the cross section of top quark pair production in proton-proton collisions recorded with the ATLAS detector at the LHC at a centre-of-mass energy of 7 TeV is reported. The data sample used corresponds to an integrated luminosity of 2.05 fb^-1. Events with an isolated electron or muon and a tau lepton decaying hadronically are used. In addition, a large missing transverse momentum and two or more energetic jets are required. At least one of the jets must be identified as originating from a b quark. The measured cross section, sigma_ttbar = 186+/- 13 (stat) +/- 20 (syst) +/- 7 (lum.) pb is in good agreement with the Standard Model prediction.
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The ATLAS Collaboration, Aad, G., Jez, P., Tanasijczuk, A. J., & et al. (2012). Measurement of the top quark pair cross section with ATLAS in pp collisions at sqrt(s) = 7 TeV using final states with an electron or a muon and a hadronically decaying tau lepton. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 717(1-3), 89-108. https://doi.org/10.1016/j.physletb.2012.09.032 (Original work published 2012)