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

  • Aad, G
  • Abbott, B
  • Abdallah, J
  • Abdelalim, A
  • Abdesselam, A
  • Abdinov, O
  • Abi, B
  • Abolins, M
  • Abramowicz, H
  • Abreu, H
  • Acerbia, E
  • Acharya, B
  • Ackers, M
  • Adams, D
  • Addy, T
  • Adelman, J
  • Aderholz, M
  • Adomeit, S
  • Adragna, P
  • Adye, T
  • Aefsky, S
  • Aguilar-Saavedra, J
  • Aharrouche, M
  • Ahlen, S
  • Ahles, F
Publication date
January 2011
Publisher
Springer New York LLC

Abstract

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...

Extracted data

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