Pion photoproduction in the "(1232) region and chiral bag models

We calculate pion photoproduction near the "(1232) resonance using a version of the chiral bag model based on an effective Lagrangian that reproduces correct pion-nucleon phenomenology through third order in the pion field. The pionic corrections to the M1 (or M1+) amplitude are common to a broad class of chiral bag models and substantially improve agreement with experiment. We treat also the E2 (or E1+) multipole which is accessible in our approach since the effective Lagrangian induces quark-quark tensor coupling through pion exchange; this in turn permits the admixture of baryon components involving quark excitation to d states. The resulting E2 admixture is consistent with the rather loose bounds set by the present experimental information on this quantity. The present work neglects the tensor force and d state arising from gluon exchange between quarks.