Prompt-photon production in deep inelastic scattering at HERA

                 ZEUS Collaboration

 Prompt-photon cross sections in deep inelastic ep scattering were
measured with the ZEUS detector at HERA using an integrated luminosity
of 320 pb-1. A clear signal for isolated photons in the photon
transverse-energy and rapidity ranges 4 < E_T^gamma < 15 GeV and
-0.7 < eta^gamma < 0.9 was observed for virtualities of the
exchanged photon of Q^2 > 10 GeV^2. Measurements of differential cross
sections are presented for inclusive prompt-photon production as a
function of Q^2, x_Bj, E_T^gamma and eta^gamma. Perturbative QCD
predictions are compared to the measurements.