Abstract submitted to the
         International Europhysics Conference on High Energy Physics
                  July 12 - 18, 2001, Budapest, Hungary
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          Search for single top production in ep collisions at HERA

                    
                               ZEUS Collaboration



                                    Abstract


        A search for single top production, ep -> e t X, has been made 
        with the ZEUS detector at HERA using an integrated luminosity 
        of ~130 pb^{-1}. The top decays predominantly to Wb and a search
        for the W was made in two decay channels. For the leptonic mode, 
        a search was made for events with missing transverse momentum 
        and isolated leptons with large transverse momentum. For the
        hadronic decay mode, three-jet events were selected and their
        invariant mass distribution was examined after requiring that
        two of the jets had an invariant mass consistent with that of
        the W. In neither search was any deviation from the Standard 
        Model prediction found. The results were used to constrain single 
        top production ep -> e t X via a flavour changing neutral current 
        (FCNC). Limits on the FCNC coupling \kappa_{tu\gamma} have been 
        obtained.