2003/12/15 by D. Gómez Dumm, D. Gomez Dumm, A. Pich +3 · 3 citations
Physics and Astronomy · #Algorithm #Computer science #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.69.073002
published as Phys.Rev.D69:073002,2004 · 24 pages, 7 figures
arxiv created 2003/12/15 · openalex publication_date 2004/04/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
\stackrel\ensuremath→\ensuremathτ\ensuremathπ\ensuremathπ\ensuremathπ\ensuremathν_\ensuremathτ decays are analyzed within the framework of the resonance effective theory of QCD. We work out the relevant Lagrangian that describes the axial-vector current hadronization contributing to these processes, in particular the local a1(1260)\ensuremath-\ensuremathρ(770)-Goldstone interactions. The new coupling constants are constrained by imposing the asymptotic behavior of the corresponding spectral function within QCD. Hence we compare the theoretical framework with the experimental data, obtaining a good quality fit from the ALEPH spectral function and branching ratio. We also get values for the mass and on-shell width of the a1(1260) resonance. In this way we are able to provide the structure functions that have been measured by OPAL and CLEO-II and we find an excellent agreement.