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

D0 Collaboration, The and Bertram, Iain and Borissov, Guennadi and Fox, Harald and Williams, Mark and Ratoff, Peter and Love, Peter and Rakitin, Alexander and Sopczak, Andre (2009) Measurement of the ttbar production cross section and top quark mass extraction using dilepton events in ppbar collisions. Physics Letters B, 679 (3). pp. 177-185. ISSN 0370-2693

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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.

Item Type: Journal Article
Journal or Publication Title: Physics Letters B
Additional Information: published in Phys. Lett. B, 10 pages, 7 figures
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63740
Deposited By: ep_importer_pure
Deposited On: 25 Apr 2013 10:30
Refereed?: Yes
Published?: Published
Last Modified: 07 Jan 2020 03:49
URI: https://eprints.lancs.ac.uk/id/eprint/63740

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