Search for resonant production of t(bar t) decaying to jets in p(bar p) collisions at √s = 1.96 TeV

This Letter reports a search for non-standard model topquark resonances, Z', decaying to t(bar t) → W+bW-(bar b) , where both W decay to quarks. We examine the top-antitop quark invariant mass spectrum for the presence of narrow resonant states. The search uses a data sample of p(bar p) collisions at a center of mass energy of 1.96 TeV collected by the CDF II detector at the Fermilab Tevatron, with an integrated luminosity of 2.8 fb-1. No evidence for top-antitop quark resonant production is found. We place upper limits on the production cross section times branching ratio for a specific topcolor assisted technicolor model with width of ΛZ' = 0.012 MZ'. Within this model, we exclude Z' boson with masses below 805 GeV/c2 at the 95% confidence level.