Comparison of the extended linear sigma model and chiral perturbation theory
arXiv:nucl-th/0506038 · doi:10.1103/PhysRevC.72.038201
Abstract
The pion-nucleon scattering amplitudes are calculated in tree approximation with the use of the extended linear sigma model (ELSM) as well as heavy baryon chiral perturbation theory (HB$Ï$PT), and the non-relativistic forms of the ELSM results are compared with those of HB$Ï$PT. We find that the amplitudes obtained in ELSM do not agree with those derived from the more fundamental effective approach, HB$Ï$PT.
7 pages