Radiative pion decay: Determination of FA(0) from τ-lepton decay data

C. A. Dominguez, J. Solà

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24 Citations (Scopus)


The form factor FA(0) in π→eνγ is calculated, at the soft pion point, directly from data on the semileptonic τ-lepton decays τ→ντ + nπ, which determine the relevant vector and axial-vector hadronic spectral functions. The reliability of this calculation is assessed by using these fitted spectral functions to check the saturation of the first two Weinberg sum rules. The results are: FA(0)=0.017±0.004, and γ(0)FA(0)/FV(0)=0.67±0.04±0.16. © 1988.
Original languageEnglish
Pages (from-to)131-134
JournalPhysics Letters B
Issue number1
Publication statusPublished - 7 Jul 1988


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