The mass and spin of the mesons, baryons and leptons
  The rest masses of the stable mesons and baryons and the rest masses of their antiparticles, as well as the rest masses of the mu (+,-) and tau (+,-) leptons can be explained, within 1% accuracy, with the standing wave model, which uses only photons, neutrinos, charge and the weak nuclear force. And we can explain the spin of the stable mesons and baryons and the spin of the mu (+,-) and tau (+,-) leptons without any additional assumption. We can also determine the rest masses of the electron-, mu- and tau-neutrinos. 
E. L. Koschmieder