Qcd and Diffraction

There is also the subject of exclusive diffraction and skewed pdf’s, which I will not dicuss here. I will also not discuss the issue of Regge theory and Regge factorization, except indirectly in the context of the BFKL equation. Regge factorization does not follow in any demonstrated way from QCD, if one includes non-perturbative phenomena, and in the context of hard scattering, it clearly fails in its simplest form. However, this is an important area of physics that needs to be properly elucidated. In the general area of diffraction, a cultural divide exists between those who work in the Breit frame (in DIS) and those who work in the target rest