Final State Interaction Effects in B+→J/ψ π+ Decay

In this research the exclusive decay of b^+?j/? ?^+ is calculated by qcd factorization (qcdf) method and final state interaction (fsi). first, the b^+?j/? ?^+ 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^+?j/? ?^+decay. for this decay, d^+ d ?^(0^* ) via the exchange of d^- and d^(-^* ) mesons are chosen for the intermediate state. the above intermediate state is calculated by using the qcdf method. in the fsi effects, the results of our calculations depend on ? as the phenomenological parameter. the range of this parameter is selected from 2 to 3. it is found that if ?=2.8 is selected, the numbers of the branching ratio are placed in the experimental range. the experimental branching ratio of b^+?j/? ?^+ decay is 4.9×?10?^(-5) and our results calculated by qcdf and fsi are 0.56×?10?^(-5) and 3.9 ×?10?^(-5) respectively.