Study of scalar mesons f_0(980) and f_0(1500) from $B \to f_0(980) K$ and $B \to f_0(1500) K$ Decays

Details Study of scalar mesons f_0(980) and f_0(1500) from $B \to f_0(980) K$ and $B \to f_0(1500) K$ Decays Study of scalar mesons f_0(980) and f_0(1500) from $B \to f_0(980) K$ and $B \to f_0(1500) K$ Decays

2006-09-08

arxiv.org/abs/hep-ph/0609082v3

Phys.Rev.D74:114010,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 7 figures, more references added

Scientific paper

10.1103/PhysRevD.74.114010

Within perturbative QCD approach based on $k_T$ factorization, we analyze the scalar mesons $f_0(980)$ and $f_0(1500)$ productions in B decays. By identifying $f_0(980)$ as the composition of $\bar ss$ and $\bar nn=(\bar uu+\bar dd)/\sqrt2$, we calculate the exclusive decays $B\to f_0(980) K$. We find that the non-factorization $f_0$-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 $B\to f_0(1500) K$. The results show that in the two-quark picture of $f_0$ meson the contribution from $\bar s s$ component is at the similar size as that from the $\bar n n$ component. Comparing with the data, our results show the preference of $f_0(1500)$ as a member of the ground state of scalar $\bar qq$ nonet. Similar results can also apply to $f_0(1370)$ and $f_0(1710)$, if these mesons are dominated by the quarkonium content. With more experimental data in future, these studies will help us understand the intrinsic characters of these scalar mesons.

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