2007/07/31 by Xing-Gang Wu, Tao Huang, Zhen-Yun Fang · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-007-0421-5
published as Eur.Phys.J.C52:561-570,2007 · 22 pages and 6 figures
arxiv created 2007/09/01 · openalex publication_date 2007/10/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In the paper, we apply the kT factorization approach to deal with the B→ K transition form factor FB→ K+,0(q2) in the large recoil regions. The B-meson wave functions ΨB and ΨB that include the three-particle Fock states' contributions are adopted to give a consistent PQCD analysis of the form factor up to \cal O (1/m2b). It has been found that both the wave functions ΨB and ΨB can give sizable contributions to the form factor and should be kept for a better understanding of the B meson decays. Then the contributions from different twist structures of the kaon wavefunction are discussed, including the SUf(3)-breaking effects. A sizable contribution from the twist-3 wave function Ψp is found, whose model dependence is discussed by taking two group of parameters that are determined by different distribution amplitude moments obtained in the literature. It is also shown that FB→ K+,0(0)=0.30±0.04 and [FB→ K+,0(0)/FB→ π+,0(0)]=1.13±0.02, which are more reasonable and consistent with the light-cone sum rule results in the large recoil regions.