2024/11/06 by Siyang Wang, Wang, Si-Yang, Zhi-Qing Zhang +7
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2411.03968
openalex publication_date 2024/11/06 · openalex created_date 2024/11/15 · openalex updated_date 2026/07/28
Different from the previous treatment in a two-body framework, we introduce the dimeson distribution amplitudes (DAs) to describe the strong dynamics between the S-wave resonances a0(980, 1450) and the K K (πη) pair, where the Gegenbauer coefficient required is determined from the experimental data on the time-like form factors involved. The branching ratios and direct CP asymmetries of the decays B → a(′)0 h → K K(πη) h, with a0=a0(980), a′0=a0(1450) and h referring to a pion or a kaon, are then calculated in the perturbative QCD (PQCD) approach. We find that the branching ratios of the corresponding quasi-two-body decays B→ a(′)0 K obtained with the narrow width approximation are closer to those predicted in the QCD factorization (QCDF) approach compared to the previous PQCD calculations, no matter a three-body or a two-body framework is assumed. Furthermore, all our predictions for these B→ a(′)0 K decays are below the current experimental upper limits except for those of decays B0→ a(′)-0K+, which are (slightly) larger than the upper limits. Under the narrow width approximation, the branching ratios of the decays B+→ a(′)+0π0, B0→ a(′)+0π- and B0→ a(′)00π0 are comparable to or agree well with the previous PQCD and the QCDF calculations. While for the decays B+→ a(′)00π+ and B0→ a(′)-0π+, their branching ratios are predicted to be unexpectedly large, for example, the obtained branching ratio of decay B+→ a00π+ is even higher than the current experimental upper limit.