We report a study of electron proton collisions at very low Q2, corresponding to virtual photoproduction at centre of mass energies in the range 100-295 GeV. The distribution in transverse energy of the observed hadrons is much harder than can be explained by soft processes. Some of the events show back-to-back two-jet production at the rate and with the characteristics expected from hard two-body scattering. A subset of the two-jet events have energy in the electron direction consistent with that expected from the photon remnant in resolved photon processes.
Derrick, M., Krakauer, D., Magill, S., Musgrave, B., Repond, J., Sugano, K., et al. (1992). OBSERVATION OF HARD SCATTERING IN PHOTOPRODUCTION AT HERA. PHYSICS LETTERS. SECTION B, 297(3-4), 404-416 [10.1016/0370-2693(92)91280-M].