Abstract submitted to the
         International Europhysics Conference on High Energy Physics
                  July 12 - 18, 2001, Budapest, Hungary
_________________________________________________________________________




            Measurement of the Q^2 dependence of the dijet production
                         associated with charm at HERA

                    
                               ZEUS Collaboration





                                    Abstract


      The dependence of the virtual-photon structure on its virtuality, 
      Q^2, is studied for the first time in events containing dijets and
      a charm particle with the ZEUS detector at HERA using an integrated
      luminosity of 104 pb^{-1}. The measurement is made in the kinematic 
      range 0 < Q^2 < 5x10^3 GeV^2 using dijet events containing a D^{*\pm}.
      Events having two jets with large transverse energies are selected
      using the longitudinally invariant k_T algorithm in the laboratory 
      frame. The dijet cross section is measured as a function of the 
      fractional momentum of the photon participating in the dijet production,
      (x_{gamma}^{obs}), and of Q^2. The ratio of the cross section at low
      x_{gamma}^{obs} ("resolved photon") relative to high x_{gamma}^{obs}
      ("direct photon") is compared to the predictions of leading-order 
      pQCD and with previous dijet measurements which did not require the 
      presence of charm.