Search for Technicolor Particles Produced in Association with a W Boson at CDF

We present a search for the Technicolor particles p(t) and pi+_T in the process pp-bar --> p(t) --> W_pi+_T at a center of mass energy of s**(1/2) 1.96 TeV. The search uses a data sample corresponding to approximately 1.9 fb-1 of integrated luminosity accumulated by the CDF II detector at the Fermilab Tevatron. The event signature we consider is W --> l nu and pi+_T -> bb-bar, bc-bar or bu-bar depending on the pi+_T charge. We select events with a single high-p-T electron or muon, large missing transverse energy, and two jets. Jets corresponding to bottom quarks are identified with multiple b-tagging algorithms. The observed number of events and the invariant mass distributions are consistent with the standard model background expectations, and we exclude a region at 95% confidence level in the p(t)-pi+_T mass plane. As a result, a large fraction of the region (m(p(t)) = 180 - 250 GeV/c2 and m(pi+_T) = 95 - 145 GeV/c2 is excluded.