364 articles – 2952 Notices  [english version]
 HAL : in2p3-00354532, version 1
 arXiv : 0901.2137
 Physics Letters B 679 (2009) 177-185
 Measurement of the ttbar production cross section and top quark mass extraction using dilepton events in ppbar collisions
 D0 Collaboration(s)
 (2009)
 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.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0901.2137
 in2p3-00354532, version 1 http://hal.in2p3.fr/in2p3-00354532 oai:hal.in2p3.fr:in2p3-00354532 Contributeur : Swarna Bassava <> Soumis le : Mardi 20 Janvier 2009, 10:56:04 Dernière modification le : Mardi 18 Août 2009, 11:10:57