3P0 model and helicity structure of photoproduction couplings

Neglecting the ΔL3=2 term within the possible algebraic structure in a 35 dimensional SU(6)/sub W/ representation for the magnetic-dipole operator is shown to result in the 3P0 model for photodecays of nucleon resonances. We then expand the reduced L3-changing amplitudes into partial waves and impose a simple SU(6)/sub W/ x O(2)/sub L3/ constraint on the W=1 and W=0 parts of the 35. This leads to several more relations among helicity amplitudes for these decays. Using vector dominance and the partial-wave parameters from resonance decays into the lowest-mass meson 35-plet, pseudoscalar decays in particular, we get photodecay couplings which are in good agreement with partial-wave analysis