The pionic beta decay in chiral perturbation theory
classification
✦ hep-ph
keywords
betachiraldecayperturbationpionictheoryanalogousanalysis
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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|.
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