Abstract
Consequences of the derivative relation f +- = λ∂f ++ ∂√−t , proposed empirically and also in various models for s-channel helicity amplitudes, are explored. A comparison with π −p→ π 0n charge-exchange data is made, imposing the usual Regge pole form on f +-. The assumptions are seen to conflict with the s-dependence of the cross-section dip and the polarization structure. There are also difficulties with finite energy sum rules and with-experimental data on some other reactions.
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