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The dissociation of virtual photons, $\gamma^{\star} p \to X p$, in eventswith a large rapidity gap between $X$ and the outgoing proton, as well as inevents in which the leading proton was directly measured, has been studied withthe ZEUS detector at HERA. The data cover photon virtualities $Q^2>2$ GeV$^2$and $\gamma^{\star} p$ centre-of-mass energies $40<W<240$ GeV, with $M_X>2$GeV, where $M_X$ is the mass of the hadronic final state, $X$. Leading protonswere detected in the ZEUS leading proton spectrometer. The cross section ispresented as a function of $t$, the squared four-momentum transfer at theproton vertex and $\Phi$, the azimuthal angle between the positron scatteringplane and the proton scattering plane. It is also shown as a function of $Q^2$and $\xpom$, the fraction of the proton's momentum carried by the diffractiveexchange, as well as $\beta$, the Bjorken variable defined with respect to thediffractive exchange.

Deep inelastic scattering with leading protons or large rapidity gaps at HERA