Abstract
The decay of the B0 meson to the K+ and K- mesons is a pure annihilation decay; for this reason, in the framework of the quantum chromodynamics factorization (QCDF) approach, this decay has a small amplitude and a small branching ratio. In this study, we find that, before the K+ and K- mesons are produced in the final states, pair mesons such as π0π0(ρ0ρ0), π+π-(ρ+ρ-), K0K0(K0*K0*), D0D0(D0*D0*), D+sD-s(D+*sD-*s), φφ and ρ0φ are produced. The intermediate-state mesons via the exchange of K+(*), K0(*), π-(ρ-), D+(*)s, D0(*) and K-(*) mesons go to the K+ and K- final-state mesons. However, we calculate the B0 →K+K- decay in two different frameworks. The first framework is the QCDF method and the second one is the use of the final-state interaction (FSI) effects. The experimental branching ratios of B0 → K+K- decay are 1.3 and 2.3 ×10-7, and our results obtained by the QCDF method and FSI are 0.11 ×10-7 and 0.09 ∼3.21 ×10-7, respectively.
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