Kaon electromagnetic form factor and QCD

Abstract

The experimental data on kaon electromagnetic form factor are analyzed both for the timelike and the spacelike momentum by using the superconvergent dispersion relation, which we proposed to synthesize the asymptotic property of QCD and the vector meson dominance model in the low momentum region. As in the case of the pion electromagnetic form factor, the experimental data on the kaon form factor are realized by our formula very well by using the three loop approximation for the effective coupling constant. The boson form factor is sensitive to the approximation on the QCD term.