BackwardπNCharge-Exchange Scattering and Pole Extrapolations of Baryon Regge-Exchange Amplitudes

Abstract

High-energy ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ backward elastic-scattering data are analyzed in terms of ${N}_{\ensuremath{\alpha}}$ and ${\ensuremath{\Delta}}_{\ensuremath{\delta}}$ Regge exchanges. Using the signs of the Regge residues found from extrapolations to the particle poles (which agree with the signs obtained from interference with direct-channel resonances), we predict the ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}n$ cross section near 180\ifmmode^\circ\else\textdegree\fi{}.