Mesons electromagnetic production study via a constituent quark approach

Abstract

Using 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).

Comments: 6 pages, Invited talk given at "International Workshop on Physics with GeV Electrons and Gamma-Rays", Sendai, February 13 -15, 2001