The Electromagnetic Form Factor of the Kaon in the Light-Front Approach
  The kaon electromagnetic form factor is calculated within a light-front constituent quark model (LFCQM). The electromagnetic components of the current are extracted from the Feynman triangle diagram within the light-front approach. We also obtain the electroweak decay constant and the charge radius for the kaon in the light-front approach. In this work, the kaon observables are calculated and a fairly good agreement is obtained with a very higher accuracy when compared with the experimental data. 
Edson O. da Silva, J. P. B. C. de Melo, Victo S. Filho and Bruno   El-Bennich
hep-ph