Consistent off-shell $\pi NN$ vertex and nucleon self-energy

Abstract

We present a consistent calculation of half-off-shell form factors in the pion-nucleon vertex and the nucleon self-energy. Numerical results are presented. Near the on-shell point the pion-nucleon vertex is dominated by the pseudovector coupling, while at large nucleon invariant masses we find a sizable pseudoscalar admixture.

Comments: 23 pages, 7 figures, REVTeX, submitted to Phys. Rev. C, replaced with corrected version