High-|t| Diffraction and Deeply Virtual Compton Scattering

At the HERA ep collider the diffractive productions of J/ψ mesons and photons were measured. The differential J/ψ cross section is studied in the range 2<|t|<30 GeV2, where |t| is the square of the 4-momentum transferred at the proton vertex. The production of photons in the process γ∗p→γY, where Y denotes the proton dissociative system or the elastically scattered proton, is measured in two different kinematical regimes: i) in photoproduction at large transverse momentum ptγ>2 GeV and ii) in electroproduction at 4