Title: A Measurement of the Production Cross-Section with the CDF Detector in Run IIa


We present preliminary results on a measurement of the pair production cross section in collisions at the center of mass energy of 1.96 TeV. Our data sample consists of 57.5 of data collected with the CDF detector at Fermilab. Using the top decay channels where one of the Ws decays leptonically, and requiring that at least one of the b quarks from the top decays be positively identified, we measure a cross section of pb.