8 pages, 4 figuesInternational audienceThis paper reports a search for nonstandard model topquark resonances, Z', decaying to tt¯→W+bW-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 pp¯ 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 2.8fb-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 in which the Z' has a width of ΓZ'=0.012MZ'. Within this model, we exclude a Z' boson with masses below 805GeV/c2 at the 95% confidence level
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