  We discuss rapidity-gap events between two jets produced at high momentum
transfer in $p$ $\bar{p}$ scattering, from the point of view of the soft energy
flow into the interjet region. We define a gap cross section and, in
perturbative QCD (pQCD), resum all the leading logarithms in the soft
intermediate energy. We show that the numerical result from our cross section
reproduces the shape of the D0 and CDF \cite{D0,CDF,D0fig} experimental data.
