Electroproduction of Nucleon Resonances with Polarized Leptons

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Abstract
The electroproduction of nucleon resonances with polarized leptons and a polarized nucleon target is considered and compared with what is expected to be the behavior of deep-inelastic polarized scattering. We find a set of nucleon resonances in the symmetric quark model such that their excitation gives the same results for the ratio of neutron to proton inelastic scattering and for the polarization asymmetry on protons and neutrons as does the naive quarkparton model. However, the symmetric quark model with harmonic forces predicts dramatic variations in the helicity structure of the excitation of the prominent nucleon resonances, which are not supported by the existing data. Additional tests of the symmetric quark model and a discussion of what is known of resonance excitation with what is expected in polarized deep-inelastic scattering are presented.