Investigation of decay process and branching ratio calculation

According to the existing particle data group (PDG) information, the branching ratio for ??2?? ????? is (8 ± 5) ×10-5 [1]. Two different values for this decay namely ?0.8 ? 0.8 ? 0.2? ?10?? , 0.84 ? 0.55??.?? ??.?? ? 10?? ??? 1.8 ? 10?? are reported by experimentallists. In this paper it is attempted to study ?-decay process theo- retically via Feynman diagrams and it is concluded that the only effective way that ? can decay into ?+ and ?- me- sons is via one photon emission in an electromagnetic process. This conclusion is based upon the fact that color con- servation is violated in one-gluon mechanism and charge conjugation is violated in two-gluon mechanism and G- parity and isospin is violated in three-gluon mechanism. By presenting the Feynman diagram, the branching ratio of ?-decay is calculated. The calculated value is in good agreement with the recently reported experimental data.