Abstract submitted to the
         XXXth International Conference on High Energy Physics
                July 27 - August 2, 2000, Osaka, Japan
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              The Q^2 Dependence of dijet cross sections
                   in gamma p Interactions at HERA


                    
                               ZEUS Collaboration





                                    Abstract


The dependence of the photon structure on the photon virtuality, Q^2,
is studied in the reaction e^+p -> e^+ jet jet X at photon-proton
centre-of-mass energies 134 < W < 223 GeV.  Events with two jets with
transverse energy E_T^{jet} > 5.5 GeV were selected in the Q^2 ranges
~ 0~GeV^2, 0.1-0.55 GeV^2, and 1.5-4.5 GeV^2.  The dijet cross section
as a function of the fractional momentum of the photon participating
in the hard process, x_gamma^obs, has been compared to NLO pQCD and
leading-order Monte Carlo programs; none gives a good description of
the data.