Axial-VectorKl4-Decay Form Factors Based on Current Algebra

The axial-vector $K_{l4\mathrm{}}$-decay form factors given by current algebra have been reevaluated using the vector $K_{l3\mathrm{}}$-decay form factors and the ratio $\frac{f_K}{f_{\pi }}$, obtained on the basis of broken chiral $S{U}_3\otimes S{U}_3$ and $S{U}_3$ symmetries. It is shown that the assumption of near constancy of these form factors leads to good agreement with the experimental data, using consistently the single Cabibbo angle ${sin\theta }_V={sin\theta }_A=0.22\mathrm{}$.