2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37757With 14 Million psi' events, many two-body decay channels are studied, which include Vector Pseudoscalar, Vector Tensor, Pseudoscalar Pseudoscalar channels. Based on systematical measurements for charmonium decay, 12% rule is tested, the phase between strong and electromagnetic amplitudes is studied. In addition, hadronic and radiative transitions of charmonia are measured to improve experimental accuracy and test theoretical calculations.6 pages, 2 figures, Talk given at DAFNE 2004: Physics at Meson Factories, Frascati, Italy, June 7-11, 2004High Energy Physics - Experimenttext