2024/11/16 by Ya-Xiong Wang, Hai-Jiang Tian, Wang, Ya-Xiong +7
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications
paper · pdf · doi:10.48550/arxiv.2411.10660
openalex publication_date 2024/11/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The leptonic decay of D+-meson has attracted significant interest due to its unique characteristics. In this paper, we carry out an investigation into the D+-meson leptonic decays D+→ ℓ+νℓ with ℓ=(e,μ,τ) by employing the QCD sum rules approach. In which the D+-meson decay constant fD+ is an important input parameter in the process. To enhance the accuracy of our calculations for fD+, we consider the quark propagator and vertex up to dimension-six within the framework of background field theory. Consequently, we obtain the QCD sum rule expression for fD+ up to dimension-six condensates, yielding fD+=203.0±1.5~MeV. Our results are in good agreement with BESIII measurements and theoretical predictions. We also present the integrated decay widths for the D+-meson in three channels Γ(D+→ e+νe)=(5.263-0.075+0.076)×10-21~GeV, Γ(D+→ μ+νμ)=(2.236-0.032+0.032)×10-16~GeV and Γ(D+→ τ+ντ)=(5.958-0.085+0.086)×10-16~GeV. Accordingly, we compute the branching fraction B(D+→ℓ+νℓ) with the electron, muon and tau channels, which are B(D+→ e+νe)=(8.260-0.118+0.119)×10-9, B(D+→μ+νμ)=(3.508-0.050+0.051)×10-4 and B(D+→τ+ντ)=(0.935-0.013+0.013)×10-3. Furthermore, we present our prediction for the CKM matrix element |Vcd| using the branching fraction B(D+→μ+νμ) obtained from BESIII Collaboration, yielding |Vcd|=0.227-0.001+0.002.