1. E. C. G. Sudarshan andR. E. Marshak:Proc. of the Padua-Venice Conference on Mesons and Newly Discovered Particles (1957);
2. R. P. Feynman andM. Gell-Mann:Phys. Rev.,109, 193 (1958); andJ. J. Sakurai:Nuovo Cimento,7, 649 (1958) used other arguments to derive the (V −A) theory but they are essentially equivalent to chirality invariance.
3. E. C. G. Sudarshan andR. E. Marshak:Phys. Rev.,109, 1860 (1958).
4. For the experimental evidence with regard to the decay Λ → p + e− + $$\overline \nu $$ , seeR. P. Ely, G. Gidal, L. Oswald, W. Singleton, W. M. Powell, F. W. Bullock, G. E. Kalmus, C. Henderson andF. R. Stannard:Proc. of the 1962 International Conference on High Energy Physics at CERN, p. 445; as regards Σ− → n + e− + $$\overline \nu $$ and Σ− → n+μ− + $$\overline \nu $$ , see the reports ofG. A. Snow and others at theBrookhaven Conference on Weak Interactions (1963).
5. Cf.R. Marshak, S. Okubo andE. Sudarshan:Phys. Rev.,113, 966 (1958).