Diffractive production of jets and weak bosons and tests of hard-scattering factorization - art. no. 074022

We extract diffractive parton densities from data on diffractive deep inela stic scattering (DIS) and on diffractive photoproduction of jets. We explor e the results of several Ansatze for the functional form of the parton dens ities. Then we use the fitted parton densities to predict the diffractive p roduction of jets and of W's and Z's in p (p) over bar collisions at the Fe rmilab Tevatron. To fit the photoproduction data requires a large gluon den sity in the Pomeron. The predictions for the Tevatron cross sections are su bstantially higher than data; this signals a breakdown of hard-scattering f actorization in diffractive hadron-hadron collisions. [S0556-2821(99)00309- 4].