The Role of the Roper in Chiral Perturbation Theory
classification
⚛️ nucl-th
hep-ph
keywords
chiralperturbationropertheoryaroundchanneldeltadeveloped
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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 $P_{11}$ channel.
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