The pionic beta decay in chiral perturbation theory

H. Neufeld (Univ. Wien); H. Pichl (PSI Villingen); M. Knecht (CPT Marseille); V. Cirigliano (Univ. Valencia)

The pionic beta decay in chiral perturbation theory

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arxiv hep-ph/0209226 v1 pith:NSEUDPWI submitted 2002-09-19 hep-ph

The pionic beta decay in chiral perturbation theory

V. Cirigliano (Univ. Valencia) , M. Knecht (CPT Marseille) , H. Neufeld (Univ. Wien) , H. Pichl (PSI Villingen) This is my paper

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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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Pion $\beta$ decay and $\tau\to\pi\pi\nu_\tau$ beyond leading logarithms
hep-ph 2026-02 conditional novelty 7.0

Pion β decay and τ→ππν short-distance radiative corrections are matched at NLL accuracy with evanescent-scheme dependence cancelled, giving Δ_RC^{πℓ}=0.03403(11) and a τ-HVP isospin-breaking shift of −0.07(4)×10^-10.