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We present a measurement of the ttbar pair production cross section in ppbarcollisions at sqrt(s) = 1.96 TeV utilizing approximately 425 pb-1 of datacollected with the D0 detector. We consider decay channels containing two highpT charged leptons (either e or \mu) from leptonic decays of both top-daughterW bosons. These were gathered using four sets of selection criteria, three ofwhich required that a pair of fully identified leptons (i.e., e\mu, ee, or\mu\mu) be found. The fourth approach imposed less restrictive criteria on oneof the lepton candidates and required that at least one hadronic jet in eachevent be tagged as containing a b quark. For a top quark mass of 175 GeV, themeasured cross section is 7.4 +/-1.4(stat} +/- 1.0(syst) pb.

Measurement of the ttbar production cross section in ppbar collisions using dilepton events