On a possibility of observing elastic photon-gluon scattering in ep collisions

It is shown that photon-gluon scattering via the quark-box diagram, which may be considered a critical test of higher-order quantum chromodynamics, should become a predominant and measurable effect in an experiment designed to study the reaction ep --> e + (high-p_T)γ + (high-p_T) jet + X under certain kinematic conditions at a superhigh-energy electron-proton storage ring such as HERA.

Also at Laboratoire de Physique des Particules, Université de Picardie, Amiens, France.