Abstract: We report on a search for charged massive resonances decaying to top (t) and bottom (b) quarks in the full data set of proton-antiproton collisions at a center-of-mass energy of vs=1.96??TeV collected by the CDF II detector at the Tevatron, corresponding to an integrated luminosity of 9.5??fb-1. No significant excess above the standard model background prediction is observed. We set 95% Bayesian credibility mass-dependent upper limits on the heavy charged-particle production cross section times branching ratio to tb. Using a standard model extension with a W'?tb and left-right-symmetric couplings as a benchmark model, we constrain the W' mass and couplings in the 300–900??GeV/c2 range. The limits presented here are the most stringent for a charged resonance with mass in the range 300–600??GeV/c2 decaying to top and bottom quarks.

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