Search for resonant production of $t\bar{t}$ decaying to jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV

This Letter reports a search for non standard model topquark resonances, $Z^{\mathrm{\prime }}$, decaying to $t\bar{t}\to W^{+}b{W}^{-}\bar{b}$ %\rightarrow qq’b qq’ \bar{b}$,whereboth$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 $\text{ppb}$ 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 ${\mathrm{\Gamma }}_{Z^{\mathrm{\prime }}}=0.012M_{Z^{\mathrm{\prime }}}$. Within this model, we exclude $Z^{\mathrm{\prime }}$ boson with masses below 805 GeV$\mathrm{/}{c}^2$ at the 95% confidence level.