Abstract submitted to the
         International Europhysics Conference on High Energy Physics
                  July 12 - 18, 2001, Budapest, Hungary
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                 Properties of hadronic final states in diffractive 
                      deep inelastic ep scattering at HERA

                    
                               ZEUS Collaboration



                                    Abstract


        Characteristics of the hadronic final state of diffractive DIS
        events ep -> eXp were studied with the ZEUS detector at HERA 
        using an integrated luminosity of 13.8 pb^{-1}. The events were 
        tagged by identifying the diffractively scattered proton using 
        the Leading Proton Spectrometer. The properties of the hadronic 
        final state X were studied using thrust, thrust angle, sphericity, 
        energy flow, transverse energy flow and "seagull" distributions.
        The final state becomes more collimated, more aligned and more 
        asymmetric in the average transverse momentum with respect
        to the direction of the virtual photon as the invariant mass of 
        the system increases. Comparisons of the properties of the hadronic 
        final state with predictions from various Monte Carlo Model 
        generators suggest that the final state is dominated by q\bar{q}g 
        states at the parton level. More transverse momentum than usually 
        associated with the resolved Pomeron approach is necessary at the 
        parton level to describe the diffractive final state.