2025/02/06 by Zhi-Tian Zou, Zou, Zhi-Tian, He Zhu +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2502.04191
openalex publication_date 2025/02/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Within the perturbative QCD (PQCD) framework, we present a systematic investigation of charmless Bs → SP decays, where S and P denote scalar and pseudoscalar mesons, respectively. By employing two distinct structural scenarios for scalar mesons, we calculate the branching fractions and direct CP asymmetries for these processes. Our results reveal branching fractions ranging from 10-7 to 10-5, values that are well within the measurable range of current experiments. A striking contrast emerges between penguin- and tree-dominated decays: while penguin-dominated processes yield larger branching fractions, tree-dominated decays exhibit significantly enhanced direct CP asymmetries. In particular, the decays Bs → f0(1370) η and Bs → a0(1450) K demonstrate marked sensitivity to the choice of scalar meson scenario, offering critical constraints for identifying the optimal model once experimental data are available. Furthermore, we calculate the branching fractions of Bs → f0(980)(σ)P decays in two distinct ranges of the mixing angle of f0(980)-σ. The dependencies of both branching fractions and CP asymmetries on this mixing angle are rigorously analyzed, establishing a framework essential for determining its value with future experimental results. These findings provide a robust theoretical foundation for advancing the understanding of nonleptonic Bsdecays in QCD-based formalisms, as well as the nature of scalar mesons.