We present the first measurement of sigma(gg ->
tt-bar)/sigma(pp-bar --> tt-bar). We use 0.96 fb-1 of s**(1/2) ñ.96
TeV pp-bar collision data recorded with the CDF II detector at Fermilab.
We identify the candidate tt-bar events with a high-energy charged
lepton, a neutrino candidate, and four or more jets with at least one
identified as originating from a b quark. Using charged particles
with low transverse momentum in tt-bar events, we find sigma(gg -->
tt-bar)/sigma(pp-bar -> tt-bar)ÿ07 +/- 0.14(stat)+/-0.07(syst),
in agreement with the standard model NLO prediction of 0.15+/-0.05.
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Updated: Wednesday, 2008 December 03 11:04:27 CST automatically from input from carol picciolo