arXiv:hep-ph/0209226·v1·High Energy Physics — Phenomenology
The pionic beta decay in chiral perturbation theory
V. Cirigliano (Univ. Valencia)🇪🇸 · M. Knecht (CPT Marseille)🇫🇷 · H. Neufeld (Univ. Wien)🇦🇹 · H. Pichl (PSI Villingen)🇨🇭
Abstract
Within the framework of chiral perturbation theory with virtual photons and leptons, we present an updated analysis of the pionic beta decay including all electromagnetic contributions of order e**2 p**2. We discuss the extraction of the Cabibbo-Kobayashi-Maskawa matrix element |Vud| from experimental data. The method employed here is consistent with the analogous treatment of the Kl3 decays and the determination of |Vus|.
Comments: 8 pages, 1 figure, latex file, uses EPJC macros