1. Y. Nambu andE. Shrauner:Phys. Rev.,128, 862 (1962).
2. The Λ and ∑ hyperons are not assumed as spinless because there is conclusive evidence that their magnetic moments are different from zero.
3. No really conclusive evidence for violations of the ΔT=1/2 rule seems in fact to exist. See ref. (8)W. J. Willis:Proceedings of the Heidelberg International Conference on Elementary Particles (Amsterdam, 1968). p. 273. (8) below.
4. We are well aware of the fact that a rotation of the axes leads to a rotatedJ. but to a fixedT. which seems to imply that no sense whatsoever can be attributed to the sumT+J. Nevertheless we think that some sense can be given to such an addition of spin and isotopic spin, for instance by thinking that in every particle there are two associated spins and that the «third component of isospin» is the projection of one spin on the other. In this way both vectors would be rotated while the «third component of isospin» would remain fixed.
5. E. Malamud andP. E. Schlein:Phys. Rev. Lett.,19, 1056 (1967).