33 research outputs found
Measurement of the ttbar production cross section and top quark mass extraction using dilepton events in ppbar collisions
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.Comment: published in Phys. Lett. B, 10 pages, 7 figure
L'assainissement collectif des communes Dispositions reglementaires et elements cles pour leur mise en oeuvre
SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : RP 185 (3801) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc
Lessons from the Microsoft case
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