Kl3Form Factors and the Scaling Behavior of Spin-0 Fields

Abstract

Motivated by scaling considerations we formulate a theory of $K_{l3\mathrm{}}$ decay based on the Kemmer equation. We find that our theory (1) has a symmetry-breaking parameter of order 10-30% which agrees with experiment, (2) makes a definite testable prediction of a kinematic zero at $t={(m_K+m_{\pi })}^2$ in the "effective" scalar form factor, and (3) yields a modified Callan-Treiman relation which improves agreement with experiment.