2023/07/06 by BESIII Collaboration, М. Н. Ачасов, Ablikim, M. +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.2307.03024
openalex publication_date 2023/07/06 · openalex created_date 2023/07/10 · openalex updated_date 2026/07/30
The D+s→ K+K-μ+νμ decay is studied based on 7.33 fb-1 of e+e- collision data collected with the BESIII detector at center-of-mass energies in the range from 4.128 to 4.226 GeV. The absolute branching fraction is measured as \mathcal B(D+s→ ϕμ+νμ) = (2.25± 0.09 ± 0.07) ×10-2, the most precise measurement to date. Combining with the world average of \mathcal B(D+s→ ϕe+νe), the ratio of the branching fractions obtained is\frac\mathcal B(D+s→ ϕμ+νμ)\mathcal B(D+s→ ϕe+νe) = 0.94±0.08, in agreement with lepton universality. By performing a partial wave analysis, the hadronic form factor ratios at q2=0 are extracted, finding rV=\fracV(0)A1(0)=1.58±0.17±0.02 and r2=\fracA2(0)A1(0)=0.71±0.14±0.02, where the first uncertainties are statistical and the second are systematic. No significant S-wave contribution from f0(980)→ K+K- is found. The upper limit B(Ds+→ f0(980)μ+νμ) ⋅\mathcal B(f0(980)→ K+K-) < 5.45 × 10-4 is set at 90% confidence level.