The compatibility of diffractive hard scattering in p pbar and ep   collisions
  We show that the data for diffractive dijet production at the Tevatron p pbar collider are consistent with diffractive deep inelastic e p data collected at HERA. The breakdown of factorization between the two data sets is naturally explained by a strong tendency to populate the rapidity gap in the p pbar diffractive process by secondaries from soft underlying interactions and by bremsstrahlung associated with the presence of the hard dijet subprocess. 
V.A. Khoze (Durham), A.D. Martin (Durham) M.G. Ryskin (Durham &   St.Petersburg)