Abstract submitted to the
         XXXth International Conference on High Energy Physics
                July 27 - August 2, 2000, Osaka, Japan
_________________________________________________________________________




               Search for lepton-flavour violation in ep collisions at HERA

                    
                               ZEUS Collaboration





                                    Abstract


Events of the type e^+p -> l X, where l is a final-state
higher-generation lepton (\mu or \tau) of high transverse momentum,
have been sought at a centre-of-mass energy of 300 GeV with the ZEUS
detector at HERA using an integrated luminosity of 47.7 pb^-1.
No evidence was found for lepton-flavour violation.
Constraints are set on the couplings of leptoquarks (LQs) mediating
lepton-flavour-violating ep reactions. Limits are provided for the \tau
decay channel for LQ masses below sqrt(s) and for both the \mu and \tau
channels for LQ masses much greater than sqrt(s).