Effective theory of theΔ(1232)resonance in Compton scattering off the nucleon

By V. Pascalutsa, D. Phillips. 2002

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We formulate a new power-counting scheme for a chiral effective field theory of nucleons, pions, and Deltas. This extends chiral perturbation theory into the Delta-resonance region. We calculate nucleon Compton scattering up to next-to-leading order in this theory. The resultant description of existing $\gamma$p cross section data is very good for photon energies up to about 300 MeV. We also find reasonable numbers for the spin-independent polarizabilities $\alpha_p$ and $\beta_p$.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f4f11255b3dc2058bccc95acbbff7de7828b5999