Final state interaction effects in the B (+) -> D (+) K (0) decay

摘要

The exclusive decay of B (+) -> D (+) K (0) is calculated by the QCD factorization method (QCDF) and final state interaction (FSI). First, the B (+) -> D (+) K (0) 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 (+) K (0) decay. For this decay, the D (s) (+) pi(0), D (s) (+) *rho(0), D (s) (+) *I center dot via the exchange of , , 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 eta as the phenomenological parameter. The range of this parameter is selected from 2 to 2.4. It is found that if eta = 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 x 10(-6) and our results calculated by QCDF and FSI are (0.16 +/- 0.04) x 10(-6) and (2.8 +/- 0.09) x 10(-6), respectively.