Abstract
A duality-inspired model for the scattering amplitude is used to explain backward ${\ensuremath{\pi}}^{+}p$ elastic-scattering data from $2.18 \frac{\mathrm{GeV}}{c}$ (incident pion laboratory momentum) on up. The quantitative success of this model gives support to the assumption that the dip at $u\ensuremath{\sim}\ensuremath{-}0.15$ Ge${\mathrm{V}}^{2}$ is due to a wrong-signature nonsense zero in the ${N}_{\ensuremath{\alpha}}$ Regge-pole exchange amplitude. A particularly interesting polarization prediction (which can soon be compared with experimental data) is also presented.
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