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

D0 COLLABORATION, ..., R.PIEGAIA,

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

Año: 2009 vol. 679 p. 177 - 185

0370-2693

We present a measurement of the top quark pair production cross section in collisions at using approximately 1 fb−1 collected with the DØ 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 τ lepton. For a mass of the top quark of 170 GeV, the measured cross section is . Using ℓτ events only, we measure: . 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 , in agreement with direct measurements.