Effective degrees of freedom in the Nucleon ?

1. + u-ch all partial waves Issues:(1)Res + bkg divisions ~ artificial s-ch res (2)Electromagnetic interaction is not isospin invariant A( N  / /)I=3/2  A( N  / /)I=1/2 N requires both n & p • fitting models to incomplete-subsets of asymmetry data will produce statements about models and endless arguments about the amplitude • path to convincing results on the presence/absence of new states are complete exps that (over-) determine production amplitudes photo-excitation of resonances “missing” from the PDG listing Effective degrees of freedom in the Nucleon ? (3)CQM: “gN small for all but lowest in each oscillator band” need N, KY channels as well 2-step  NN… important (CC) (4)8 pol obs needed for A( N) & 12 for A(* N), for both N= n, p

2. Complete experiments in pseudo-scalar meson production p  K+  ,P,Cx,Cz,Ox,Oz,T  E,G,Lx,Lz,Tx,Tz complete set  E,G,Lx,Lz,Tx,Tz frozen-Spin - developed at BNL, migrating to JLab(?) • high polarizations • in-beam lifetimes >> year • very low backgrounds  clean channel separation • factors of > 20 reduction in running-time n  K0 ,E,G,P,T,Cx,Cz,Ox,Oz,Lx,Lz,Tx,Tz - a complete set Channel coupling requires complete experiments in other decay channels, particularly 0p, –p requires exps. challenge