Measurement of the fraction of tt? production via gluon-gluon fusion in pp? collisions at s=1.96TeV
Journal
Physical Review D - Particles, Fields, Gravitation and Cosmology
Journal Volume
79
Journal Issue
3
Date Issued
2009
Author(s)
Aaltonen, T. et al. (CDF Collaboration)
Abstract
We present a measurement of the ratio of the tt̄ production cross section via gluon-gluon fusion to the total tt̄ production cross section in pp̄ collisions at s=1.96TeV at the Tevatron. Using a data sample with an integrated luminosity of 955pb-1 recorded by the CDF II detector at Fermilab, we select events based on the tt̄ decay to lepton+jets. Using an artificial neural network technique we discriminate between tt̄ events produced via qq̄ annihilation and gg fusion, and find Gf=σ(gg→tt̄)/ σ(pp̄→tt̄)<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, Gf=0.07-0.07+0.15. © 2009 The American Physical Society.
Type
journal article