Search for resonant production oftt¯decaying to jets inpp¯collisions ats=1.96  TeV

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doi:10.1103/physrevd.84.072003

Abstract

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

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