We present the first measurement of sigma(gg -> t (t) over bar)/sigma(p (p) over bar -> t (t) over bar). We use 0.96 fb(-1) of root s = 1.96 TeV p (p) over bar collision data recorded with the CDF II detector at Fermilab. Using charged particles with low transverse momentum in t (t) over bar events, we find sigma(gg -> t (t) over bar)/sigma(p (p) over bar -> t (t) over bar) = 0.07 +/- 0.14(stat) +/- 0.07(syst), corresponding to a 95% confidence level upper limit of 0.33, in agreement with the standard model next-to-leading-order prediction of 0.15 +/- 0.05.
First measurement of the fraction of top-quark pair production through gluon-gluon fusion
INTROZZI, GIANLUCA;
2008-01-01
Abstract
We present the first measurement of sigma(gg -> t (t) over bar)/sigma(p (p) over bar -> t (t) over bar). We use 0.96 fb(-1) of root s = 1.96 TeV p (p) over bar collision data recorded with the CDF II detector at Fermilab. Using charged particles with low transverse momentum in t (t) over bar events, we find sigma(gg -> t (t) over bar)/sigma(p (p) over bar -> t (t) over bar) = 0.07 +/- 0.14(stat) +/- 0.07(syst), corresponding to a 95% confidence level upper limit of 0.33, in agreement with the standard model next-to-leading-order prediction of 0.15 +/- 0.05.File in questo prodotto:
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