Photoexcitation of the Nucleon in the Constituent Quark Model
  Photoexcitation of the nucleon is studied in the framework of the constituent quark model with nonrelativistic quark-quark interactions. Utilizing the dominance of the pairwise structure of the relevant three-quark potential, the bound and excited state wave functions have been constructed using the Faddeev-type Integrodifferential Equation Approach. The method is based on the Hyperspherical Harmonics expansion and takes two-body correlations exactly into account and therefore reliable wave functions, required in photo processes, can be obtained. The integrated photoabsorption cross sections for the E1-and M1-transitions are calculated and compared with experimental values as well as with those of other theoretical calculations. Our results, in overall, are in good to very good agreement with the experimental values. 
I.P.Matamba, M.Braun, S. A. Sofianos