A method is used in which the usual analytic properties of the πN scattering amplitude are exploited in a more complete way to obtain information about ρ-type Regge poles. It is found that the low-energy data determine the forward Reggeized ρ-meson-exchange parameters quite accurately. These are found to be in complete agreement with high-energy analyses. We are also able to see that in the forward direction, only ρ-meson exchange is allowed to a very good approximation. The evaluation of low-energy parameters and the prediction of forward pion charge-exchange scattering are also discussed. A criterion is given relating the validity of the "interference" model to the behavior of the general sum rule.
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M. G. Olsson (1968) studied this question.
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