OBSERVATION OF HARD SCATTERING IN PHOTOPRODUCTION AT HERA

OBSERVATION OF HARD SCATTERING IN PHOTOPRODUCTION AT HERA

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...

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Bibliographic Details
Main Authors: Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Repond, J, Sugano, K, Stanek, R, Talaga, R, Thron, J, Arzarello, F, Ayed, R, Barbagli, G, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, G, Bruni, P, Romeo, G, Castellini, G, Chiarini, M, Cifarelli, L, Cindolo, F, Ciralli, F, Contin, A
Format: Journal article
Language:English
Published: 1992
Description
Summary: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.

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