Energy scales and diffraction scattering

The influence of thresholds on models of diffraction scattering is considered. We use the experimental existence of effective inelastic diffraction and baryon-antibaryon thresholds to conjecture a relationship between the bare Pomeron P), of the Gribov calculus, the bare Pomeron P) of recent fits to Fermilab--CERN-ISR elastic data, and a bare Pomeron P of intercept alpha-circumflex0approx. =0.85 utilized in medium-energy two-body and high-energy inclusive phenomenology. A set of energy scales is set up decsribing approximate regions of validity of various models for diffraction, including the Gribov calculus. An iterative approximation scheme to the s- and t-channel unitarity equations at small t and large s is described