Observation of Rapidity Gaps inp¯pCollisions at 1.8 TeV

In $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}$ TeV we find jet events with a rapidity gap topology. The number of hadrons in the rapidity interval $\Delta {\eta }_D$ between leading-jet cones was sampled by charged tracks with $P_T>400\mathrm{}$ MeV/c. We find excess trackless events beyond that expected in a smooth multiplicity distribution. In a control region outside $\Delta {\eta }_D$ we see no excess. For $\Delta {\eta }_D>0.8\mathrm{}$, the fraction of excess trackless events, consistent with estimates based on exchange of color-singlet digluons, is $R\left(\mathrm{gap}\right)=\frac{{\sigma }_{\mathrm{jet}}\left(\mathrm{gap}\right)}{{\sigma }_{\mathrm{jet}}}=0.0085\mathrm{}\pm {0.0012\left(\mathrm{stat}\right)}_{-0.0012\mathrm{}}^{+0.0024\mathrm{}}\left(\mathrm{syst}\right)$.