Mass Spectrum of Elementary Particles, II

The considerations of mass spectrum of elementary particles are presneted. First, the eigenvalue problem of the mass of a Dirac particle is discussed; the mass eigenvalues of the Dirac particles which interacts with itself through scalar photon fields are estimated by a method similar to that developed in the case of a deuteron for a Yukawa well. Secondly, the ambiguities which appear in the calculation of the nucleon self-energy caused by scalar mesons with vector coupling are discussed. It is shown that, in spite of the ambiguities, we may assume a fermion (∼2350me) and a scalar cohesive meson (∼1100me) to get convergence of the nucleon self-energy due to π mesons. A brief survey of the model of heavy particles which seems to be qualitatively consistent with the recent experimental results, is also given.