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- W2045336321 abstract "Three basic pionic amplitudes f π + , F π (for π 0 →γγ), and F 3π (for πγ→γγ) are calculated in a QCD-oriented Bethe-Salpeter model of qq hadrons which fits the spectra of all quarkonia. The results, f π + =157 MeV (experiment, 135), Γ(π 0 →γγ)=8.03 eV (7.9), and F 3π =12.7 GeV -3 (13±2), obtained with no free parameters, agree with the data and with the Wess-Zumino-Witten theory." @default.
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- W2045336321 date "1987-11-23" @default.
- W2045336321 modified "2023-09-26" @default.
- W2045336321 title "Understanding Electroweak Couplings of the Pion as aqq¯Composite" @default.
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- W2045336321 doi "https://doi.org/10.1103/physrevlett.59.2408" @default.
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