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

Details Effective theory of the Delta(1232) in Compton scattering off the nucleon Effective theory of the Delta(1232) in Compton scattering off the nucleon

2002-12-05

arxiv.org/abs/nucl-th/0212024v4

Phys.Rev. C67 (2003) 055202

Physics

Nuclear Physics

Nuclear Theory

29 pp, 9 figs. Minor revisions. To be published in PRC

Scientific paper

10.1103/PhysRevC.67.055202

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 $\beta_p$.

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