We present a measurement of the ratio of the tt-bar production
cross section via gluon-gluon fusion to the total tt-bar production cross
section in p anti-p collisions at s**(1/2) ñ.96 TeV at the Tevatron.
Using a data sample with an integrated luminosity of 955 pb-1 recorded
by the CDF II detector at Fermilab, we select events based on the tt-bar
decay to lepton+jets. Using an artificial neural network technique we
discriminate between tt-bar events produced via qq-bar annihilation and
gg fusion, and find G_f ÿigma(gg --> tt-bar)/sigma(p anti-p -->
tt-bar) < 0.33 at the 68% confidence level. This result is combined
with a previous measurement to obtain the most stringent measurement of
this quantity by CDF to date, G_f 0.070.15_-0.07.
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Updated: Tuesday, 2009 March 03 16:28:16 CST automatically from input from carol picciolo