JETP Letters: issues online

In this research the exclusive decay of B⁺→ D⁺K⁰ is calculated by QCD factorization method (QCDF) and final state interaction (FSI). First, the B⁺→ D⁺K⁰ decay is calculated via QCDF method. The result that is found by using the QCDF method is less than the experimental result. So FSI is considered to solve the B⁺→ D⁺K⁰ decay. For this decay, the D_s⁺π⁰, D_s⁺^*ρ⁰, D_s⁺^*φ via the exchange of $\bar{K}^0$ , ${\bar{K}^0{}}^*$ , D^-, and D^-^* mesons are chosen for the intermediate states. The above intermediate states are calculated by using the QCDF method. In the FSI effects, the results of our calculations depend on η as the phenomenological parameter. The range of this parameter is selected from 2 to 2.4. It is found that if η=2.4 is selected, the numbers of the branching ratio are placed in the experimental range. The experimental branching ratio of this decay is less than 2.9•10^-6 and our results calculated by QCDF and FSI are $(0.16\pm0.04)\cdot10^{-6}$ and $(2.8\pm0.09)\cdot10^{-6}$ respectively.