Diffractive Dijet Production at sqrt(s)=630 and 1800 GeV at the Fermilab Tevatron
Abstract
We report a measurement of the diffractive structure function F_{jj}^D of the antiproton obtained from a study of dijet events produced in association with a leading antiproton in \bar pp collisions at \sqrt s=630 GeV at the Fermilab Tevatron. The ratio of F_{jj}^D at \sqrt s=630 GeV to F_{jj}^D obtained from a similar measurement at \sqrt s=1800 GeV is compared with expectations from QCD factorization and with theoretical predictions. We also report a measurement of the \xi (x-Pomeron) and \beta (x of parton in Pomeron) dependence of F_{jj}^D at \sqrt s=1800 GeV. In the region 0.035<\xi<0.095, |t|<1 GeV^2 and \beta<0.5, F_{jj}^D(\beta,\xi) is found to be of the form \beta^{-1.0\pm 0.1} \xi^{-0.9\pm 0.1}, which obeys \beta-\xi factorization.