2023/03/22 by BESIII Collaboration, M. Ablikim, М. Н. Ачасов +703
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2303.12927
openalex publication_date 2023/03/22 · openalex created_date 2023/03/25 · openalex updated_date 2026/08/03
Using e+e- collision data corresponding to an integrated luminosity of 7.33~\rm fb-1 recorded by the BESIII detector at center-of-mass energies between 4.128 and 4.226~\rm GeV, we present an analysis of the decay Ds+ → π+π- e+νe, where the Ds+ is produced via the process e+e- → Ds*±Ds∓. We observe the f0(980) in the π+π- system and the branching fraction of the decay Ds+ → f0(980)e+νe with f0(980)→π+π- measured to be (1.72 ± 0.13\rm stat ± 0.10\rm syst) ×10-3, where the uncertainties are statistical and systematic, respectively. The dynamics of the Ds+ → f0(980)e+νe decay are studied with the simple pole parametrization of the hadronic form factor and the Flatté formula describing the f0(980) in the differential decay rate, and the product of the form factor ff0+(0) and the c→ s Cabibbo-Kobayashi-Maskawa matrix element |Vcs| is determined for the first time to be ff0+(0)|Vcs|=0.504±0.017\rm stat±0.035\rm syst. Furthermore, the decay D+s→ f0(500) e+νe is searched for the first time but no signal is found. The upper limit on the branching fraction of D+s→ f0(500) e+νe,~f0(500)→π+π- decay is set to be 3.3 × 10-4 at 90% confidence level.