2008/09/30 by S. Faller, A. Khodjamirian, Alexander Khodjamirian +2
Mathematics · Physics and Astronomy · #Amplitude #Cone (formal languages) #Distribution (mathematics) #Distribution function #Form factor (electronics) #Function (biology) #High-Energy Particle Collisions Research #Light cone #Limit (mathematics) #Mathematical analysis #Mathematics #Meson #Momentum (technical analysis) #Nuclear physics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Recoil #Sum rule in quantum mechanics #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-009-0968-4
published as Eur.Phys.J.C60:603-615,2009 · 20 pages, 6 figures; one reference, one figure and several comments added; version to appear in European Physical Journal C
arxiv created 2009/02/24 · openalex publication_date 2009/03/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We derive new QCD sum rules for B→ D and B→ D^* form factors. The underlying correlation functions are expanded near the light-cone in terms of B-meson distribution amplitudes defined in HQET, whereas the c-quark mass is kept finite. The leading-order contributions of two- and three-particle distribution amplitudes are taken into account. From the resulting light-cone sum rules we calculate all B→ \Dst form factors in the region of small momentum transfer (maximal recoil). In the infinite heavy-quark mass limit the sum rules reduce to a single expression for the Isgur-Wise function. We compare our predictions with the form factors extracted from experimental B→ \Dst l νl decay rates fitted to dispersive parameterizations.