Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7$ TeV

collisions at \sqrt{s}=7 \TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron

e

or muon

\mu

) with large missing transverse energy and at least four jets, and dilepton (

ee

,

\mu\mu

or

e\mu

) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb-1, 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-\ttbar Standard Model processes are estimated using data-driven methods and determined to be

12.2 \pm 3.9

events and

2.5 \pm 0.6

events, respectively. The kinematic properties of the selected events are consistent with SM \ttbar production. The inclusive top quark pair production cross-section is measured to be \sigmattbar=145 \pm 31 ^{+42}_{-27} pb where the first uncertainty is statistical and the second systematic. The measurement agrees with perturbative QCD calculations.

Note:

30 pages plus author list (50 pages total), 9 figures, 11 tables, CERN-PH number and final journal added

truth: pair production: measured
truth: total cross section
quantum chromodynamics: perturbation theory
topology
kinematics
ATLAS
CERN LHC Coll

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Measurement of the top quark-pair production cross section with ATLAS in pp collisions at s=7\sqrt{s}=7s​=7 TeV

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Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7$ TeV