We present the result of a search for a massive color-octet
vector particle, (e.g. a massive gluon) decaying to a pair of top quarks
in proton-antiproton collisions with a center-of-mass energy of 1.96 TeV.
This search is based on 1.9 fb-1 of data collected using the CDF detector
during Run II of the Tevatron at Fermilab. We study tt-bar events in
the lepton + jets channel with at least one b-tagged jet. A massive
gluon is characterized by its mass, decay width, and the strength of its
coupling to quarks. These parameters are determined according to the
observed invariant mass distribution of top quark pairs. We set limits
on the massive gluon coupling strength for masses between 400 and 800
GeV/c2 and width-to-mass ratios between 0.05 and 0.50. The coupling
strength of the hypothetical massive gluon to quarks is consistent with
zero within the explored parameter space.
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Updated: Monday, 2010 July 26 14:40:35 CDT automatically from input from Carol Picciolo