  Structure of leptons and hadrons within the framework of electrodynamics is
considered. Muon and tau-lepton have the structure of 3 electrons. 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. Hadrons are
characterized by the structure of 5 electrons. The masses of hadrons are
defined via the masses of muon and tau-lepton.
