Particle rest-mass and application. Free neutron decay

The Standard Model (SM) describes the electron mass as resulting from a dimensionless Yukawa-coupling-constant. The Yukawa-Potential describes the interactions of e-, mu, tau, and their neutrinos with the Higgs field background. After diagonalization of the matrix, the particle masses are basically the product of an arbitrary Yukawa coupling times the Higgs field value (250 GeV). (Tod Gardiner) However, there is no theory (''flavor physics'') that determines the Yukawa coupling constant for each lepton up to now. Therefore we present a mass-formula for the restmass of a single, free electron, muon and tauon at rest, as well as for the two composite particles proton and neutron based on Einstein's Theory. This (pure) rest mass is made from internal action only, so defined to be free from external interaction which of course, if present, has a contribution to mass. Application of the rest-mass generating mechanism is the beta-minus decay of a free neutron. The Feynman-Diagram is extended by the self-energy-levels of the components and includes the mediating W-Boson (external) action as a catalyst-particle.