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


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Aad G., Abbott B., Abdallah J., Abdelalim A. A. , Abdesselam A., Abdinov O., ...Daha Fazla

PHYSICS LETTERS B, cilt.707, ss.459-477, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 707 Konu: 5
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.physletb.2011.12.055
  • Dergi Adı: PHYSICS LETTERS B
  • Sayfa Sayıları: ss.459-477

Özet

A measurement of the production cross section of top quark pairs (t (t) over bar) in proton-proton collisions at a center-of-mass energy of 7 TeV recorded with the ATLAS detector at the Large Hadron Collider is reported. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. Using a data sample corresponding to an integrated luminosity of 35 pb(-1), a t (t) over bar production cross section sigma(t (t) over bar) = 177 +/- 20(stat.) +/- 14(syst.) +/- 7(lum.) pb is measured for an assumed top quark mass of m(t) = 172.5 GeV. A second measurement requiring at least one jet identified as coming from a b quark yields a comparable result, demonstrating that the dilepton final states are consistent with being accompanied by b-quark jets. These measurements are in good agreement with Standard Model predictions. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.