Final state interaction effect in the pure annihilation B → φφ decay

We analyzed the process of B → φφ decay in quantum chromodynamics factorization (QCDF) and final state interaction (FSI). In QCDF for this decay we have only the annihilation graph and we expected small branching ratio. Then we considered FSI effect as a sizable correction where the intermediate states are K⁰K/overbar⁰, K⁺ K^-, and D_s⁺D_s^- mesons. To consider the amplitudes of these intermediate states, the QCDF approach was used. The experimental branching ratio of B → φφ is less than 2 x 10^-7 and our results are 0.04 x 10^-7 and 1.54 x 10^-7 from QCDF and FSI, respectively. (author)