Pure annihilation decay of strange beauty meson into two charm heavy mesons

In this study, the heavy to heavy decay of B~0→DD~- is evaluated through the factorization approach by using the final state interaction as an effective correction. Under the factorization approach, this decay mode occurs only through the annihilation process, so a small amount is produced. Feynman’s rules state that six meson pairs can be assumed for the intermediate states before the final meson pairs are produced. By taking into account the effects of twelve final state interaction diagrams in the calculations, a significant correction is obtained. These effects correct the value of the branching ratio obtained by the pure factorization approach from(2.41 ± 1.37) × 10to(8.27 ± 2.23) × 10. The value obtained for the branching ratio of the B~0→DD~- decay is consistent with the experimental results.