  The weak interactions are described within the framework of electrodynamics.
The massive vector field is considered as photon with the effective mass
defined in the second order of the perturbation theory. Muon and tau-lepton are
considered to be composite particles having the structure
electron-positron-electron. The mass of muon is defined by the section of
two-photon annihilation. The mass of tau-lepton is defined by the section of
three-photon annihilation.
