arXiv:1105.2764·v2·Nuclear Theory
The Role of the Roper in Chiral Perturbation Theory
Bingwei Long🇺🇸 · U. van Kolck🇺🇸
Abstract
We include the Roper excitation of the nucleon in a version of heavy-baryon chiral perturbation theory recently developed for energies around the delta resonance. We find significant improvement in the channel.
Comments: Version to be published