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The data on the form factors of the $K_{e4}$ decay permit to fix a value ofthe non-specified in the theory parameter entering in the lagrangian of thesystem of $0^+$ and $0^-$ mesons . Then, for a mass of the lightest$\sigma$-meson we find: $m_{\sigma}$=663 MeV. As for a nature of the spin-1mesons, also contributing into $K_{e4}$ form factors, the data do not allow tointerpret them as the gauge bosons of the chiral theory.

What The $K_{E4}$ Decay Tells Us On A Value Of $\Sigma$-Particle Mass And On A Nature Of The Spin-1 Mesons