Measurement of the top quark-pair production cross section with ATLAS in pp collisions at root s=7 TeV

Journal article

A measurement of the production cross-section for top quark pairs (tt) in pp collisions at √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 μ) with large missing transverse energy and at least four jets, and dilepton (ee, μμ or eμ) 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-tt Standard Model processes are estimated using data-driven methods and determined to be 12.2 ± 3.9 events and 2.5 ± 0.6 events, respectively. The kinematic properties of the selected events are consistent with SM tt production. The inclusive top quark pair production cross-section is measured to be (Formula Presented). The measurement agrees with perturbative QCD calculations.

Authors: Aad, G; Abbott, B; Abdallah, J; Abdelalim, A; Abdesselam, A

• Publication status: Published
• Publisher: Springer New York LLC
• Journal: EUROPEAN PHYSICAL JOURNAL C
• Volume: 71
• Issue: 3
• Pages: 1-36
• Publication date: 2011-03-01
• DOI: 10.1140/epjc/s10052-011-1577-6
• EISSN: 1434-6052
• ISSN: 1434-6044
• Language: English