Light meson physics with Crystal Ball/MAMI and at BES-III

Rare decays of light mesons like eta', eta', and omega offer excellent possibilities to study fundamental symmetries and symmetry-breaking patterns. Furthermore, electromagentic transitions with vertices P gamma*gamma as in decays of light pseudoscalar mesons (P) or meson production in e(+)e(-) collisions give insight into hadronic structure through transition form factors and produce additional constraints for the determination of the anomalous magnetic moment of the muon (g - 2)mu. In this article, recent results on eta and omega decays from the Crystal Ball at MAMI experiment as well as feasibility studies on transition form factors for the Crystal Ball and the BES-III at BEPC-II facility are presented.