Study of scalar mesons f0(980) and f0(1500) from B→f0(980)K and B→f0(1500)K decays

Within perturbative QCD approach based on kT factorization, we analyze the scalar mesons f0(980) and f0(1500) productions in B decays. By identifying f0(980) as the composition of ss and nn=(uu+dd)/√(2), we calculate the exclusive decays B→f0(980)K. We find that the nonfactorization f0-emission diagrams can give larger contribution to the branching ratio, than the previous PQCD calculation. Our new results can explain the current experimental data well. Under the assumption of quarkonium dominance, we study the branching ratio of decays B→f0(1500)K. The results show that in the two-quark picture of f0 meson the contribution from ss component is at the similar size as that from the nn component. Comparing the data, our results show the preference of f0(1500) as a member of the ground state of scalar qq nonet. Similar results can also apply to f0(1370) and f0(1710), if these mesons are dominated by the quarkonium content. With more experimental data in the future, these studies will help us understand the intrinsic characters of these scalar mesons