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We study pion--nucleon scattering with a chiral lagrangian of pions,nucleons, and $\Delta$-isobars to order $Q^3$, where $Q$ is a generic smallmomentum. We compare the results from heavy baryon chiral perturbation theorywith those from the infrared regularization scheme. While the former provides areasonable fit to the data out to a pion c.m. kinetic energy of 100 MeV, thelatter is only able to fit up to 40 MeV and even then the parameters obtainedare unreasonable. Difficulties with the infrared scheme in the $u$-channel arediscussed.Comment: 20 pages revtex, minor revisions, to be published in Phys. Rev.

Low energy pion-nucleon scattering in the heavy baryon and infrared schemes