We report on a study of diffractive dijet production in p̅
p collisions at √s=1.96 TeV using the CDF II detector at the
Fermilab Tevatron p̅ p collider. A data sample from 310 pb-1 of
integrated luminosity collected by triggering on a high transverse energy
jet, ETjet, in coincidence with a recoil antiproton detected in a Roman
pot spectrometer is used to measure the ratio of single-diffractive to
inclusive-dijet event rates as a function of xp̅ of the interacting
parton in the antiproton, the Bjorken-x, xBjp̅ , and a Q2≈(ETjet)2
in the ranges 10-3<xBjp̅ <10-1 and 102<Q2<104 GeV2,
respectively. Results are presented for the region of p̅ -momentum-loss
fraction 0.03<ξp̅ <0.09 and a four-momentum transfer squared
tp̅ >-4 GeV2. The tp̅ dependence is measured as a function of
Q2 and xBjp̅ and compared with that of inclusive single diffraction
dissociation. We find weak xBjp̅ and Q2 dependencies in the ratio
of single diffractive to inclusive event rates, and no significant Q2
dependence in the diffractive tp̅ distributions.
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Updated: Wednesday, 2012 October 17 11:01:58 CDT automatically from input from Stephanie A Schuler