2021/09/30 by Jian Chai, Shan Cheng, Ai-Jun Ma
Mathematics · Physics and Astronomy · #Algorithm #Branching fraction #CP violation #Excited state #Geometry #High-Energy Particle Collisions Research #Isovector #Mathematics #Meson #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #State (computer science) #hep-ph
paper · pdf · doi:10.1103/physrevd.105.033003
29pages, 4 figures and 7 tables, minor revision, typos corrected, references updated
openalex created_date 2021/09/13 · arxiv created 2022/01/10 · openalex publication_date 2022/02/17 · arxiv updated 2022/03/02 · openalex updated_date 2026/08/05
We propose to study the multiparticle configurations of isovector scalar mesons, saying a0(980) and a0(1450), in the charmless three-body B decays by considering the width effects. Two scenarios of a0 configurations are assumed, in which the first one take a0(980) as the lowest-lying q q state and a0(1450) as the first radial excited state, the second one take a0(1450) as the lowest-lying q q state and a0(1950) as the first radial excited state while a0(980) is not a q q state. Within these two scenarios, we do the PQCD calculation for the quasi-two-body B → a0 [→ K K/πη] h decays and extract the corresponding branching fractions of two-body B → a0 h decays under the narrow width approximation. Our predictions show that the first scenario of a0(980) configuration can not be excluded by the available measurements in B decays, the contributions from a0(1450) to the branching fractions in most channels are comparable in the first and second scenarios. Several channels are suggested for the forthcoming experimental measurements to reveal the multiparticle configurations of a0, such as the channel B0 → a0-(980) [→ π-η] π+ with the largest predicted branching fraction, the channels B0 → a0±(1450) [→ K^± K0, π^±η] π^∓ whose branching fractions obtained in the second scenario is about three times larger in magnitude than that obtained in the first scenario, and also the channels B+ → a0+(1950) [ K+ K0/π+η] K0 whose branching fractions are linear dependent on the partial width Γa0(1950) → KK/πη.