Unified description of kaon electroweak form factors

A calculation of the semileptonic decays of the kaon ${(K}_{l3\mathrm{}})$ is presented. The results are direct predictions of a covariant model of the pion and kaon introduced earlier by Ito, Buck, and Gross. The weak form factors for $K_{l3\mathrm{}}$ are predicted with absolutely no parameter adjustments of the model. We obtained, for the form factor parameters, $f_{-}{(q}^2{=m}_l^2{)/f}_{+}{(q}^2{=m}_l^2)=-0.28$ and ${\lambda }_{+}$= 0.028, both within experimental error bars. The connections of this approach to heavy quark symmetry are discussed.