2005/07/20 by J. Bordes, J. Peñarrocha, Karl Schilcher +1 · 36 citations
Mathematics · Physics and Astronomy · #Charm (quantum number) #Charm quark #Combinatorics #Computation #Duality (order theory) #High-Energy Particle Collisions Research #Lattice QCD #Mathematics #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Pseudoscalar meson #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Sum rule in quantum mechanics #hep-ph
paper · pdf · doi:10.1088/1126-6708/2005/11/014
published in Journal of High Energy Physics 2005(11), 014 (Springer Nature)
arxiv created 2005/07/20 · openalex publication_date 2005/11/14 · openalex created_date 2016/06/24 · arxiv updated 2016/08/16 · openalex updated_date 2026/08/05
We compute the decay constants of the pseudoscalar mesons D and Ds using a linear combination of finite energy sum rules which minimize the contribution of the unknown continuum spectral function. We employ the recent three loop calculation of the pseudoscalar two-point function expanded in powers of the running charm quark mass. The theoretical uncertainties arising from the QCD asymptotic expansion are quite relevant in this case due to the relative small scale of the charm mass. We obtain the following results: fD=177 ± 21 MeV and f_Ds=205 ± 22 MeV. These results, within the error bars, are in good agreement with estimates obtained using Borel transform QCD sum rules, but somewhat smaller than results of recent lattice computations.