Diffractive Dijet Production in Antiproton-Proton Collisions at $\sqrt{s}$=1.96 TeV

Abstract

We report on a study of diffractive dijet production in $\bar{p}p$ collisions at $\sqrt{s}=1.96$ TeV using the CDF II detector at the Fermilab Tevatron $\bar{p}p$ collider. A data sample from 310 pb${}^{-1}$ of integrated luminosity collected by triggering on a high transverse energy jet, $E_T^{jet}$, 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 $x^{\bar{p}}$ of the interacting parton in the antiproton, the Bjorken-$x$, $x_{Bj}^{\bar{p}}$, and a $Q^2\approx (E_T^{jet}{)}^2$ in the ranges $10^{-3}<x_{Bj}^{\bar{p}}<10^{-1}$ and $10^2<Q^2<10^4$ GeV${}^2$, respectively. Results are presented for the region of $\bar{p}$-momentum-loss fraction $0.03<{\xi }_{\bar{p}}<0.09$ and a four-momentum transfer squared $t_{\bar{p}}>-4$ GeV${}^2$. The $t_{\bar{p}}$ dependence is measured as a function of $Q^2$ and $x_{Bj}^{\bar{p}}$ and compared with that of inclusive single diffraction dissociation. We find weak $x_{Bj}^{\bar{p}}$ and $Q^2$ dependencies in the ratio of single diffractive to inclusive event rates, and no significant $Q^2$ dependence in the diffractive $t_{\bar{p}}$ distributions.

arXiv comment22 pages, 23 figures; published version

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