Geometric scaling in exclusive processes

Abstract

We show that according to the present understanding of the energy evolution of the observables measured in deep-inelastic scattering, the photon-proton scattering amplitude has to exhibit geometric scaling at each impact parameter. We suggest a way to test it experimentally at HERA. A qualitative analysis based on published data is presented and discussed.

Comments: 9 pages, 2 figures. v2: references added, some points clarified