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Published November 15, 1961 | Published
Journal Article Open

Principle of equivalence for all strongly interacting particles within the S-matrix framework


The notion, inherent in Lagrangian field theory, that certain particles are fundamental while others are complex, is becoming less and less palatable for baryons and mesons as the number of candidates for elementary status continues to increase. Sakata has proposed that only the neutron, proton, and A are elementary,(1) but this choice is rather arbitrary, and strong-interaction consequences of the Sakata model merely reflect the established symmetries.

Additional Information

© 1961 The American Physical Society. Received 30 October 1961. We should like to acknowledge enormous benefit received from conversations with M. Froissart, M. Gell-Mann, and S. Mandelstam, without implying that they agree with all the arguments given here.

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