Abstract
HERA is the ep collider, built primarily for investigating the internal structure of nucleons through deep-inelastic scattering (DIS) processes. Two experiments, H1 and ZEUS, recorded about 0.5 fb−1 of collisions each. In DIS, diffractive processes occur through diffractive exchange between a virtual photon and the proton, where the virtual photon dissociates into a multi-hadron state, while the proton stays intact or dissociates into a state with small mass (proton dissociation). The diffractive exchange between the photon and the proton can be explained by either a perturbative two-gluon ladder or non-perturbative particle-like state (Pomeron). The objective of diffractive studies at HERA is to investigate the partonic nature of the diffractive exchange.
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