π-N from an Extended Effective Field Theory
classification
⚛️ nucl-th
keywords
deltafieldpi-ntheoryaccountsaccuratelybelowchiral
read the original abstract
Third order chiral perturbation theory accounts for the $\pi-N$ scattering phase shift data out to energies slightly below the position of the $\Delta$ resonance. The low energy constants are not accurately determined. Explicit inclusion of the $\Delta$ field is favored.
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