1999/05/12 by Hai-Yang Cheng, Kwei-Chou Yang · 1 citation
Physics and Astronomy · #Annihilation #Hadron #High-Energy Particle Collisions Research #Meson #Nuclear physics #Octet #Operator product expansion #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Quarkonium #hep-ph
paper · pdf · doi:10.1103/physrevd.61.014008
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 61(1) (American Physical Society) · 14 pages, 3 figures
arxiv created 1999/05/12 · openalex publication_date 1999/12/08 · openalex created_date 2016/06/24 · arxiv updated 2016/08/24 · openalex updated_date 2026/08/05
The QCD-based operator-product-expansion technique is systematically applied to the study of charmed meson lifetimes. We stress that it is crucial to take into account the momentum of the spectator light quark of charmed mesons; otherwise the destructive Pauli-interference effect in D+ decays will lead to a negative decay width for the D+. We have applied the QCD sum rule approach to estimate the hadronic matrix elements of color-singlet and color-octet 4-quark operators relevant to nonleptonic inclusive D decays. The lifetime of Ds+ is found to be longer than that of D0 because the latter receives a constructive W-exchange contribution, whereas the hadronic annihilation and leptonic contributions to the former are compensated by the Pauli interference. We obtain the lifetime ratio \ensuremathτ(Ds+)/\ensuremathτ(D0)\ensuremath≈1.08\ifmmode±\else\textpm\fi0.04, which is larger than some earlier theoretical estimates, but still smaller than the recent measurements by CLEO and E791.