Prompt-photon production in DIS

In the study of high energy collisions involving hadrons, events in which isolated high-energy photons (often referred to as prompt photons if originating from quarks) are observed provide a direct probe of the underlying parton process, since the emission of these photons is unaffected by parton hadronisation. Isolated high-energy photon production has been studied in hadronic collisions[2] and ep collisions in both the photoproduction [3] and deep inelastic scattering (DIS) [4] regimes. The present results are compared to theoretical predictions and also to Monte Carlo (MC) models .