Abstract submitted to the
         XXXth International Conference on High Energy Physics
                July 27 - August 2, 2000, Osaka, Japan
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          Measurement of azimuthal asymmetries in deep inelastic scattering

                    
                               ZEUS Collaboration





                                    Abstract


    The distribution of the azimuthal angle for charged hadrons has been
    studied in the hadronic centre-of-mass system for neutral current
    deep inelastic positron-proton scattering with the ZEUS detector at
    HERA, using an integrated luminosity of 38~pb$^{-1}$.
    Measurements of the dependence of the moments of this
    distribution on the transverse momenta of the charged hadrons are
    presented. Asymmetries that can be unambiguously attributed to
    perturbative QCD processes have been observed for the first time.