Ambiguities in the partial-wave analysis of pseudoscalar-meson   photoproduction
  Ambiguities in pseudoscalar-meson photoproduction, arising from incomplete experimental data, have analogs in pion-nucleon scattering. Amplitude ambiguities have important implications for the problems of amplitude extraction and resonance identification in partial-wave analysis. The effect of these ambiguities on observables is described. We compare our results with those found in earlier studies. 
Greg Keaton and Ron Workman (Virginia Tech)