Abstract
A new constraint on s-channel helicity amplitudes in the impact parameter representation called the helicity-independent structure hypothesis (HISH) is proposed. This is a less restrictive constraint on helicity amplitudes than that of the dual absorptive model in the sense that pheripherality is not required explicitly in the proposed model. It is shown that the HISH plays a central role in the approach used, just as the peripherality does inthe dual absorptive model, and that the peripherality of the helicitynonflip amplitude is not the consequence of absorption effects but is due to the peripheral structure of the Regge-pole residue itself. The helicity amplitudes of pi /sup -/ + p yields pi /sup o/ + n interactio ns are successfully explained in the proposed model. (JFP)
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