Measurement of the fraction of t(t)over-bar production via gluon-gluon fusion in p(p)over-bar collisions at root s=1.96 Tev (original) (raw)

This paper presents a measurement of the fraction of top-antitop (tt) production via gluon-gluon fusion in proton-antiproton (pp) collisions at a center-of-mass energy of 1.96 TeV at the Tevatron. Utilizing data collected by the CDF II detector and employing artificial neural networks to distinguish events, the fraction of tt events from gluon-gluon fusion was constrained to be below 0.33 at the 68% confidence level. This result is combined with prior measurements to yield a most stringent value of 0.07 with uncertainties, consistent with standard model predictions.