Diffraction in lepton-hadron and hadron-hadron scattering

Abstract

We study diffractive phenomena in proton-proton and electron-proton collisions at the LHC and DESY using analyticity, crossing symmetry and unitarity, particularly the Regge-pole model realizing these concepts. Fits to the data are presented and tensions between theoretical predictions and the data that may indicate the way to further progress are in the focus of our paper. Elastic pp (LHC) and DIS ep scattering (DESY) usually are considered by means of two pomerons, “soft” and “hard” or with a single one, but varying intercept. We introduce a reggeometric pomeron replacing the above objects.