2003/12/16 by D. Gómez Dumm, D. Gomez Dumm, Antonio Pich +6
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0312211
5 pages, 4 figures
arxiv created 2003/12/16 · openalex publication_date 2003/12/16 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
We analyse tau -> (3 pions) nutau decays within the framework of the resonance chiral theory of QCD. We have worked out the relevant Lagrangian that describes the axial-vector current hadronization contributing to these processes, and the new coupling constants that arise have been constrained by imposing the asymptotic behaviour 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, and provide the tau -> (3 pions) nutau structure functions that have been measured by OPAL and CLEO-II finding an excellent agreement.