Abstract
Fixed-t dispersion relations together with an effective Regge-pole parametrization of exchange amplitudes are used to transform the incomplete high-energy data into information about amplitudes. Clear trends in the t structure and energy dependence emerge in the two obtained solutions corresponding to a discrete ambiguity. The sensitivity of the solutions on polarization and low-energy inputs is investigated in great detail with important conclusions about the t structure of amplitudes. In solution I, ImH/sub n/ is peripheral but ImH/sub 0/ is sensitive to polarization input for -t< or approx. =0.3 GeV/sup 2/. The single-flip amplitude cannot be described as a simple Regge pole in contrast to ..pi..N charge exchange. In solution II, only ImH/sub 1/ is peripheral and the structures of ImH/sub 0/ and ImH/sub 2/ are approximately reversed. Solution II is tentatively rejected. It is also found that the t structure of amplitudes and their energy dependence are only weakly related. Our solutions are compared with results obtained by other authors and we comment also on the observed absorption effects.
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