Abstract
Results of a relativistic model for pion- and photon-induced reactions on the proton are presented. The model is crossing symmetric and gauge invariant. The nucleon resonances P 11(1440), P 11(1710), D 13(1520), S 11(1535), S 11(1650), P 33(1232), P 33(1600), S 31(1620), and D 33(1700) have been included explicitly in the calculation. Unitarity within the channel space πN⊕ γN below the two-pion production threshold has been achieved by using the K-matrix approach. Strong and electromagnetic coupling parameters of the N ∗ resonances have been determined from a fit to the pion-nucleon phase shifts, pion-photoproduction multipoles and Compton-scattering cross sections. The model is shown to describe simultaneously most of the available data. Results for the electric and magnetic polarizabilities of the nucleon are presented.
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