1998/02/25 by A. Khodjamirian, Alexander Khodjamirian, R. Rückl +1 · 3 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.58.054013
published as Phys.Rev. D58 (1998) 054013 · 19 pages, 10 figures, Latex, epsfig
arxiv created 1998/02/25 · openalex publication_date 1998/08/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
QCD sum rules on the light cone are derived for the sum f++f^\ensuremath- of the \stackrel\ensuremath→B\ensuremathπ and \stackrel\ensuremath→D\ensuremathπ form factors taking into account contributions up to twist four. Combining the results with the corresponding f+ form factors calculated previously by the same method, we obtain the scalar form factors f0. Our sum rule predictions are compared with lattice results, current-algebra constraints, and quark-model calculations. Furthermore, we calculate decay distributions and the integrated width for the semileptonic decay \stackrel\ensuremath→B\ensuremathπ\ensuremathτ\ensuremathν_\ensuremathτ which is sensitive to f0. Finally, the dependence of the sum rules on the heavy quark mass and the asymptotic scaling laws are discussed.