Isoscalar and isovector kaon form factors from $e^{+}{e}^{-}$ and $\tau$ data

Abstract

The recent precise measurements of the $e^{+}{e}^{-}\to K_S{K}_L$ and $e^{+}{e}^{-}\to K^{+}{K}^{-}$ cross sections and the hadronic spectral function of the ${\tau }^{-}\to K^{-}{K}_S{\nu }_{\tau }$ 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.

Comments: 9 pages, 6 figures