title: Photoproduction of positive-parity excited baryons in the 1/Nc expansion of QCD.
abstract: We analyze the photoproduction helicity amplitudes for positive-parity excited baryons in the context of the 1/N(c) expansion of QCD. The results show that subleading corrections in 1/N(c) are important and that, while one-body effective operators are dominant, there is some evidence for the need for two-body effects.
authors.affiliation: Department of Physics, Hampton University, Hampton, Virginia 23668, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Goity
authors.forename: N N
authors.initials: NN
authors.lastname: Scoccola