Unitarity Corrections to Low-Energy Parameters in Soft-Pion Calculations

Abstract

We unitarize the results of soft-pion current-algebra calculations of low-energy parameters for $s$-wave pion-nucleon scattering in the $I=\frac{1}{2}$ channel, using the $\frac{N}{D}$ formalism. We isolate clearly corrections arising from unitarity, off-shell kinematics, and off-shell dynamics.