Measurement of the ttbar Production Cross Section with an in situ Calibration of b-jet Identification Efficiency
Abstract
A measurement of the top-quark pair-production cross section in ppbar collisions at sqrts=1.96 TeV using data corresponding to an integrated luminosity of 1.12/fb collected with the Collider Detector at Fermilab is presented. Decays of top-quark pairs into the final states e nu + jets and mu nu + jets are selected, and the cross section and the b-jet identification efficiency are determined using a new measurement technique which requires that the measured cross sections with exactly one and multiple identified b-quarks from the top-quark decays agree. Assuming a top-quark mass of 175 GeV/c2, a cross section of 8.5+/-0.6(stat.)+/-0.7(syst.) pb is measured.
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