Browsing by Author "Abdallag, J."
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Item Measurement of the Top Pair Production Cross Section in 8 TeV Proton-Proton Collisions Using Kinematic Information in the Lepton + Jets Final State with ATLAS(Amer Physical Soc, 2015-06) Aad, G.; Abbott, B.; Abdallag, J.; Adbel Kjalek, S.; Abdinov, O.; Aben, R.; Izen, Joseph M.; Leyton, Michael; Meirose, Bernhard; Namasivayam, Harisankar; Reeves, Kendall; ATLAS Collaboration; 250674117 (Izen, JM); 250674117 (Izen, JM); Izen, Joseph M.; Leyton, Michael; Meirose, Bernhard; Namasivayam, Harisankar; Reeves, KendallA measurement is presented of the tt̅ inclusive production cross section in pp collisions at a center-of-mass energy of √s̅ = 8 TeV using data collected by the ATLAS detector at the CERN Large Hadron Collider. The measurement was performed in the lepton + jets final state using a data set corresponding to an integrated luminosity of 20.3 fb⁻¹. The cross section was obtained using a likelihood discriminant fit and b-jet identification was used to improve the signal-to-background ratio. The inclusive tt̅ production cross section was measured to be 260 ± 1(stat) {-23}^{+22} (stat) ± 8(lumi) ± 4(beam) pb assuming a top-quark mass of 172.5 GeV, in good agreement with the theoretical prediction of 253{-15}^{+13} pb. The tt̅ → (e, μ) + jets production cross section in the fiducial region determined by the detector acceptance is also reported.