Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2012-01-09
Phys. Lett. B711 (2012) 244-263
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages plus author list (21 pages total), 6 figures, 2 tables, revised author list, matches published version in Physics Let
Scientific paper
10.1016/j.physletb.2012.03.083
A measurement of the production cross-section for top quark pairs (t tbar) in pp collisions at sqrt{s} = 7 TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in the single lepton topology by requiring an electron or muon, large missing transverse momentum and at least three jets. With a data sample of 35/pb, two different multivariate methods, one of which uses b-quark jet identification while the other does not, use kinematic variables to obtain cross-section measurements of sigma (t tbar) = 187 +/- 11 (stat.) +18-17 (syst.) +/- 6 (lumi.) pb and sigma (t tbar) = 173 +/- 17 (stat.) +18-16 (syst.) +/- 6 (lumi.) pb} respectively. The two measurements are in agreement with each other and with QCD calculations. The first measurement has a better a priori sensitivity and constitutes the main result of this Letter.
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