K_{l4} decays

:   An effective theory of large-NC QCD of pseudoscalar, vector, and axial-vector mesons has been used to study six Kl4 decay modes. It has been found that the matrix elements of the axial-vector current dominate the Kl4 decays. PCAC is satisfied. A relationship between three form factors of the axial-vector current has been predicted. Partial-wave analysis has been done. Non-zero phase shifts are originated in ρ→ππ. The decay rates are calculated in the chiral limit. In this study there is no adjustable parameter.