Measurement of the tt-bar Production Cross Section in 2 fb-1 of p anti-p Collisions at s**(1/2) =1.96 TeV Using Lepton Plus Jets Events with Soft Muon Tagging

We present a measurement of the tt-bar production cross section in p anti-p collisions at s**(1/2) =1.96 TeV using events containing a high transverse momentum electron or muon, three or more jets, and missing transverse energy. Events consistent with tt-bar decay are found by identifying jets containing candidate heavy-flavor semileptonic decays to muons. The measurement uses a CDF Run II data sample corresponding to 2 fb-1 of integrated luminosity. Based on 248 candidate events with three or more jets and an expected background of 79.5 +/- 5.3 events, we measure a production cross section of 9.1 +/- 1.6 pb.