ChiralSU3⊗SU3Gauge-Invariant Dynamics and theKl4Decay Form Factors

A nonlinear chiral $S{U}_3\otimes S{U}_3$ gauge-invariant phenomenological Lagrangian with the symmetry breaking through mass terms has been constructed. The model is then employed to study the dynamical structures of the $K_{l4\mathrm{}}$ decay axial-vector form factors. The predicted decay rates are found to be in good agreement with experiments as well as with other calculations based on current algebra and dispersion theory.