2025/06/19 by Hu, Dan-Dan, Wu, Xing-Gang, Tian, Hai-Jiang +2
Physics and Astronomy · #FOS: Physical sciences #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.2506.15967
openalex publication_date 2025/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The isospin-singlet scalar meson f0(980) is hypothesized to consist of two energy eigenstates, forming a mixture of (1)/(√(2))(uu + dd) and ss. Building on this framework, we apply the QCD sum rules approach in the background field theory to compute the f0(980) decay constant, yielding ff0(μ0=1 GeV) = 0.386±0.009 GeV. Subsequently, we derive the first two ξ-moments of the leading-twist light-cone distribution amplitude ϕ2;f0. Using QCD light-cone sum rules, we then calculate the D+s → f0(980) transition form factor (TFF) f+(q2), obtaining f+(0) = 0.516+0.027-0.024 at the large-recoil point. We extend f+(q2) to the full physical region via a simplified series expansion parameterization, enabling calculations of the differential decay widths and the branching fraction B(D+s → f0(980)(→ π+π-)e+νe) = (1.783+0.227-0.189) × 10-3. Our theoretical predictions align well with the latest BESIII Collaboration measurements within reasonable errors.