  Factorization of short- and long-distance interactions is severely broken in
hard diffractive hadronic collisions. Interaction with the spectator partons
leads to an interplay between soft and hard scales, which results in a leading
twist behavior of the cross section, on the contrary to the higher twist
predicted by factorization. This feature is explicitly demonstrated for
diffractive radiation of abelian (Drell-Yan, gauge bosons, Higgs) and
non-abelian (heavy flavors) particles
