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- W4231530913 abstract "Once-subtracted dispersion relations are used together with the algebra of currents and soft-pion techniques to investigate the form factors ${f}_{ifmmodepmelsetextpmfi{}}(t)$ which describe ${K}_{l3}$ decays. Particular attention is paid to the influence of $S$-wave $Kensuremath{pi}$ states, and results are obtained which depend explicitly on the $S$-wave phase shift. Various parametrizations of this phase shift are made in an effort to clarify the interdependence of the $Kensuremath{pi}$ scattering amplitude and the ${K}_{l3}$ form factors. It is found to be difficult to obtain a value for $ensuremath{xi}ensuremath{equiv}frac{{f}_{ensuremath{-}}(0)}{{f}_{+}(0)}$ which is not small and negative, while the momentum dependence of ${f}_{ensuremath{-}}(t)$ may be quite rapid in some cases." @default.
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- W4231530913 date "1968-08-25" @default.
- W4231530913 modified "2023-09-26" @default.
- W4231530913 title "Kl3-Decay Form Factors, Current Algebra, and Subtracted Dispersion Relations. II" @default.
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- W4231530913 doi "https://doi.org/10.1103/physrev.172.1532" @default.
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