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We search for evidence of resonant top quark pair production in 955 pb-1 ofp-pbar collisions at sqrt(s)=1.96 TeV recorded with the CDF II detector at theFermilab Tevatron. For fully reconstructed candidate t-tbar events triggered onleptons with large transverse momentum and containing at least one identifiedb-quark jet, we compare the invariant mass spectrum of t-tbar pairs to theexpected superposition of standard model t-tbar, non-t-tbar backgrounds, and asimple resonance model based on a sequential Z' boson. We establish upperlimits for sigma(p-pbar to Z') times Br(Z' to t-tbar) in the Z' mass intervalfrom 450 GeV/c2 to 900 GeV/c2. A topcolor leptophobic Z' is ruled out below 720GeV/c2, and the cross section of any narrow Z'-like state decaying to t-tbar isfound to be less than 0.64 pb at 95% C.L. for M(Z') above 700 GeV/c2.

Limits on the Production of Narrow t-tbar Resonances in p-pbar Collisions at sqrt(s)=1.96 TeV