2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81652Using a chiral constituent quark approach based on the broken SU(6) \otimes O(3) symmetry, we focus on the spectroscopy of isospin-1/2 nucleonic resonances. A model for the eta photoproduction, embodying all known nucleonic resonances, shows clear need for a yet undiscovered S11 resonance, for which we determine the mass (1.730 GeV) and the total width (180 MeV).6 pages, Invited talk given at "International Workshop on Physics with GeV Electrons and Gamma-Rays", Sendai, February 13 -15, 2001Nuclear Theorytext