Measurement of the t anti-t production cross section and top quark mass extraction using dilepton events in p anti-p collisions

• Published in: Physical review letters 2009-01, Vol.102 (3)
• Main Authors: Abazov, V M, /Dubna, JINR, Abbott, B, /Oklahoma U., Abolins, M, /Michigan State U., Acharya, B S, /Tata Inst, Adams, M, /Illinois U., Chicago, Adams, T, /Florida State U., Aguilo, Ernest, /Alberta U. /Simon Fraser U. /York U., Canada /McGill U., Ahsan, M, /Kansas State U., Alexeev, G D, Alkhazov, G, /St. Petersburg, INP, Alton, A, /Michigan U. /Northeastern U.
• Format: Article
• Language: English
• Subjects: CROSS SECTIONS; DECAY; ELECTRONS; Experiment-HEP; FORECASTING; LEPTONS; MUONS; PAIR PRODUCTION; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PRODUCTION; QUANTUM CHROMODYNAMICS; T QUARKS
• ISSN: 0031-9007; 1079-7114

We present a measurement of the top quark pair production cross section in p{bar p} collisions at {radical}s = 1.96 TeV using approximately 1 fb{sup -1} of data collected with the D0 detector. We consider decay channels containing two high p{sub T} 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{sub -1.0}{sup +1.0}(stat){sub -0.06}{sup +0.7}(syst){sub -0.5}{sup 0.6}(lumi) pb. Using {ell}{sub {tau}} events only, they measure: {sigma}{sub t{bar t}} x B(t{bar t} {yields} {ell}{sub {tau}}b{bar b}) = 0.13{sub -0.08}{sup +0.09}(stat){sub -0.06}{sup 0.06}(syst)+{sub -0.02}{sup +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{sub -8.8}{sup +9.9} GeV, in agreement with direct measurements.