Using the Weinberg technique, two pions (other than the odd pion) are simultaneously reduced in $K\to 3\pi$ decay modes. Then the current algebra and the hypothesis of partially conserved axial-vector current enable us to predict correctly the energy spectrum of the odd pion in these decays.

• Received 20 February 1967

DOI:https://doi.org/10.1103/PhysRev.160.1275