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

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>24/08/2009
<mark>Journal</mark>Physics Letters B
Issue number3
Volume679
Number of pages9
Pages (from-to)177-185
<mark>State</mark>Published
<mark>Original language</mark>English

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.

Bibliographic note

published in Phys. Lett. B, 10 pages, 7 figures