Eur. Phys. J. C (2007) 50: 877-887
https://doi.org/10.1140/epjc/s10052-007-0231-9

Regular Article - Theoretical Physics

Study of K^* ₀(1430) and a₀(980) from B→K^* ₀(1430)π and B→a₀(980)K decays

¹ CCAST (World Laboratory), P.O. Box 8730, Beijing, 100080, P.R. China
² Institute of High Energy Physics, CAS, P.O. Box 918(4), Beijing, 100049, P.R. China

^* e-mail: wwang@mail.ihep.ac.cn

Received: 2 November 2006
Revised: 15 January 2007
Accepted: 15 January 2007
Published online: 7 March 2007

Abstract

We use the decay modes B→K^* ₀(1430)π and B→a₀(980)K to study the scalar mesons K^* ₀(1430) and a₀(980) within the framework of perturbative QCD. For B→K^* ₀(1430)π, we perform our calculation in two scenarios for the scalar meson spectrum. The results indicate that scenario II is more favored by the experimental data than scenario I. The important contribution from annihilation diagrams can enhance the branching ratios by about 50% in scenario I and about 30% in scenario II. The direct CP-asymmetries in B→K^* ₀(1430)π are small, which is consistent with the present experiments. The predicted branching ratio of B→a₀(980)K in scenario I differs from the experiments by a factor of 2, which indicates that a₀(980) cannot be interpreted as q̄q.