New Approach to Algebra of Currents and Application toK→2πDecay

Ambiguities arising in some applications of current algebra are overcome by employing the algebra of currents to calculate the subtraction constant in a once-subtracted dispersion relation. The new approach is applied to $K\to 2\pi$ decay and yields corrections to the usual current-algebra method of about 10%. The branching ratio $\frac{(K^{+}\to {\pi }^{+}+{\pi }^0)}{({K_1}^0\to {\pi }^{+}+{\pi }^{-})}$ is also computed and agrees well with experiment.