Measurement of the ttbar production cross section and top quark mass extraction using dilepton events in ppbar collisions
arXiv:0901.2137 · doi:10.1016/j.physletb.2009.07.032
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: σ_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.
published in Phys. Lett. B, 10 pages, 7 figures
References in corpus (4)
- Theoretical status and prospects for top-quark pair production at hadron colliders
- Updated predictions for the total production cross sections of top and of heavier quark pairs at the Tevatron and at the LHC
- The theoretical top quark cross section at the Tevatron and the LHC
- Measurement of sigma(ppbar -> Z + X) Br(Z -> tau+tau-) at sqrt(s)=1.96 TeV