Abstract submitted to the
         International Europhysics Conference on High Energy Physics
                  July 12 - 18, 2001, Budapest, Hungary
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       Diffractive results from the ZEUS Leading Proton Spectrometer at HERA 

                    
                               ZEUS Collaboration





                                    Abstract


       The diffractive dissociation of virtual photons, gamma^* p -> X p, 
       with Q^2 > 4 GeV^2 has been studied with the ZEUS detector at HERA 
       using an integrated luminosity of 13 pb^{-1}. The study is based on 
       ep interactions with a scattered proton in the Leading Proton 
       Spectrometer. The 1997 data are analyzed in terms of the diffractive 
       structure functions F_2^D(3) and F_2^D(4). The cross section is 
       presented as a function of the four-momentum transfer squared, t, and
       the azimuthal angle between the electron scattering plane and the 
       proton scattering plane.