Study of the kaon electromagnetic form factors in e ⁺ e ^- Annihilation and τ decays

The recent precise measurements of the e ⁺ e ^- → K ⁺ K ^- and e ⁺ e ^- → K_S K_L cross sections and the hadronic spectral function of the τ ^- → K ^- K _S ν _τ decay are used to extract the isoscalar and isovector electromagnetic kaon form factors and their relative phase in a model independent way. The experimental results are compared with a fit based on the vector-meson-dominance model.