Diffractive Dijets with a Leading Antiproton in $\overline{p}\mathit{p}$ Collisions at $\sqrt{\mathit{s}}=1800\mathrm{}\mathrm{GeV}$

We report results from a study of events with a leading antiproton of beam momentum fraction $0.905<\mathrm{}{x}_F<0.965\mathrm{}$ and 4-momentum transfer squared $|t|<3\mathrm{}{\mathrm{GeV}}^2$ produced in $\overline{p}p$ collisions at $\sqrt{s}=1800\mathrm{}\mathrm{GeV}$ at the Fermilab Tevatron collider. Approximately $2\%$ of the events contain two jets of transverse energy $E_T^{\mathrm{jet}}>7\mathrm{}\mathrm{GeV}$. Using the dijet events, we evaluate the diffractive structure function of the antiproton and compare it with expectations based on results obtained in diffractive deep inelastic scattering experiments at the DESY $\mathrm{ep}$ collider HERA.