Aad, G.Abbott, B.Abdallag, J.Kjalek, S. AdbelAbdinov, O.Aben, R.Adelman, J.2022-12-252022-12-2520151550-79981550-2368https://doi.org/10.1103/PhysRevD.91.112013https://hdl.handle.net/20.500.11851/9570A measurement is presented of the (tt) over bar inclusive production cross section in pp collisions at a center-ofmass energy of pffisffiffi root s = 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 (tt) over bar 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 (tt) over bar -> (e, mu) + jets production cross section in the fiducial region determined by the detector acceptance is also reported.eninfo:eu-repo/semantics/openAccessParton DistributionsArticle2-s2.0-8493545792610.1103/PhysRevD.91.112013