Measurement of the ttbar production cross section and top quark mass extraction using dilepton events in ppbar collisions

Abstract : We present a measurement of the top quark pair production cross section in ppbar collisions at \sqrt{s}=1.96 TeV using approximately 1 fb^{-1} of data collected with the D0 detector. We consider decay channels containing two high pt charged leptons where one lepton is identified as an electron or a muon while the other lepton can be an electron, a muon or a hadronically decaying tau lepton. For a mass of the top quark of 170 GeV, the measured cross section is 7.5 +1.0-1.0 (stat) +0.7-0.6 (syst) +0.6-0.5 (lumi) pb. Using lepton+tau events only, we measure: \sigma_ttbar \times B(ttbar to ltau bbbar) = 0.13 +0.09-0.08 (stat) +0.06-0.06 (syst) +0.02-0.02 (lumi) pb. Comparing the measured cross section as a function of the mass of the top quark with a partial next-to-next-to leading order Quantum Chromodynamics theoretical prediction, we extract a mass of the top quark of 171.5 +9.9-8.8 GeV, in agreement with direct measurements.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00354532
Contributor : Swarna Bassava <>
Submitted on : Tuesday, January 20, 2009 - 10:56:04 AM
Last modification on : Thursday, November 19, 2020 - 12:58:50 PM

Citation

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Measurement of the ttbar production cross section and top quark mass extraction using dilepton events in ppbar collisions. Physics Letters B, Elsevier, 2009, 679, pp.177-185. ⟨10.1016/j.physletb.2009.07.032⟩. ⟨in2p3-00354532⟩

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