We present a search for a new heavy vector boson Z' that
decays to gluons. Decays to on-shell gluons are suppressed, leading
to a dominant decay mode of Z' --> g*g. We study the case where the
off-shell gluon g* converts to a pair of top quarks, leading to a final
state of t bar t g. In a sample of events with exactly one charged lepton,
large missing transverse momentum and at least five jets, corresponding
to an integrated luminosity of 8.7 fb-1 collected by the CDF II detector,
we find the data to be consistent with the standard model. We set upper
limits on the production cross section times branching ratio of this
chromophilic Z' at 95% confidence level from 300 fb to 40 fb for Z'
masses ranging from 400 GeV/c2 to 1000 GeV/c2, respectively.
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Updated: Friday, 2013 February 22 08:41:27 CST automatically from input from Barbara Hehner