Relativistic Effects in Two-Body Systems: pi- and K-mesons and Deuteron

The electromagnetic form factors of $\pi$ and $K$ mesons and deuteron are calculated in modified impulse approximation using instant form of relativistic Hamiltonian dynamics. The different model wave functions are used. Meson wave function parameters are fixed by fitting the mean square radius of meson. The internal quark structure is taken into account through electromagnetic quark form factor and quark anomalous magnetic moments. Results of our calculations of electroweak structure of pion and kaon and electromagnetic deuteron properties agree well with the available experimental data. The meson form factors asymptotics at large momentum transfer is the same as in perturbative QCD. Some predictions about CEBAF experiments are given.