Chiral Dynamics, Field-Current Identity, and theKl3form Factors

Abstract

Based on the notions of chiral dynamics and the field-current identity as applied to the broken SU(3), theoretical expressions for the form factors $f_{\pm }\mathrm{}\left(t\right)\mathrm{}$ are obtained. A small $\xi$ ($\left|\xi \right|\ll 1$) and a large $\left|{\lambda }_{-}\right|$ (an order of magnitude larger than ${\lambda }_{+}$) are predicted. [However, the product $\xi {\lambda }_{-}$ is expected to be small.]