Inclusive diffraction

Abstract

Results are given on the measurements of the hard diffractive interactions at HERA $ep$ collider. The structure of the diffractive exchange in terms of partons and the factorisation properties are discussed, in particular by comparing the QCD predictions for dijets and $D^*$ with measurements both in the photo and electroproduction regimes.Comment: Contribution to the Proceedings of the Ringberg Workshop ``New Trends in HERA Physics 2005". 10 Page