Electromagnetic form factors of charged and neutral kaons in an extended   vector-meson-dominance model
  A model is developed for electromagnetic form factors of the charged and neutral K-mesons. The formalism is based on ChPT Lagrangians with vector mesons. The form factors, calculated without fitting parameters, are in a good agreement with experiment for space-like and time-like photon momenta. Contribution of the two-kaon channels to the muon anomalous magnetic moment a_\mu is calculated. 
S.A. Ivashyn and A.Yu. Korchin