This Letter reports a search for a narrow resonant state
decaying into two $W$ bosons and a bottom-antibottom quark pair
where one $W$ boson decays leptonically and the other decays into a
quark-antiquark pair. The search is particularly sensitive to top-antitop
resonant production. We use the full data sample of proton-antiproton
collisions at a center-of-mass energy of 1.96 TeV collected by the CDF
II detector at the Fermilab Tevatron, corresponding to an integrated
luminosity of 9.45 fb-1. No evidence for resonant production is found
and upper limits on the production cross section times branching ratio
for a narrow resonant state are extracted. Within a specific benchmark
model, we exclude a Z' boson with mass below 915 GeV/c2 decaying into a
top-antitop pair at the 95% credibility level assuming a Z' boson decay
width of $\Gamma_{Z'} = 0.012~M_{Z'}$. This is the most sensitive search
for a narrow qqbar-initiated t anti-t resonance in the mass region below
750 GeV/c2.
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Updated: Friday, 2013 March 29 11:15:54 CDT automatically from input from Barbara Hehner