Unitarized Heavy Baryon Chiral Perturbation Theory and the $\Delta$ Resonance in $\pi N$ Scattering

J. Nieves, E. Ruiz Arriola

Based on the recent phenomenological analysis done by M. Mojzis, Eur. Phys. Jour. {\bf C2} (1998) 182, of $\pi N$ scattering within the framework of Heavy Baryon Chiral Perturbation…