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VOLUME 58 (1993) | ISSUE 1 | PAGE 7
Isovector form factor of the K meson
A 1D integral representation for the isovector form factor of the К meson is derived in terms of the π-meson form factor and the amplitude for π К backscattering. Normalization of the form factor at the origin yields sum rules for the amplitude and makes it possible to find the difference between the s-wave scattering lengths for π К scattering: аъ0п—αι0/2~0.22μ~\ where μ is the mass of the π meson. The isovector form factor of the К meson turns out to be numerically close to half the π-meson form factor. This result agrees qualitatively with the vector dominance model.