Final state interaction in B0 → D+sD−s

Abstract

In this research, the hadronic decay of B0 → D+sD−s is analyzed using the ‘QCD factorization’ (QCDF) method and final state interaction (FSI). First, the B0 → D+sD−s decay is calculated via the QCDF method and the annihilation graphs exist only in this method. Hence, the FSI must be seriously considered to solve the B0 → D+sD−s decay, and the D+D−(D+*D−*), , K+K−(K+*K−*), and ϕϕ via the exchange of K0(*), K−(*), , D−(*) and D−(*)s mesons, respectively, are chosen for the intermediate states. To estimate the intermediate state amplitudes, the QCDF method is again used. These amplitudes are used in the absorptive part of the diagrams. The experimental branching ratio of the B0 → D+sD−s decay is less than 3.6 × 10−5, and our results according to the QCDF method and FSI are 0.31 × 10−5 and 3.01 × 10−5, respectively.