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The kaon electromagnetic (e.m.) form factor is reviewed considering alight-front constituent quark model. In this approach, it is discussed therelevance of the quark-antiquark pair terms for the full covariance of the e.m.current. It is also verified, by considering a QCD dynamical model, that a goodagreement with experimental data can be obtained for the kaon weak decayconstant once a probability of about 80% of the valence component is taken intoaccount.

Electromagnetic structure and weak decay of meson K in a light-front QCD-inspired