A Quasi-Nuclear Coloured Quark Model for Hadrons

  • H. J. Lipkin
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 45)


Once upon a time physicists believed that nucleons and pions were elementary like electrons and photons, and that Yukawa’s theory of nuclear forces was the analog of QED for strong interactions. Then the Δ (3–3 resonance) was discovered, and then the ρ and other pion resonances, and it became apparent that neither the pion nor the nucleon was elementary and that both had a composite structure. Today pions and nucleons seem to be very similar objects, instead of being very different like the electron and photon, and made of the same basic building blocks: spin 1/2 quarks bound by coloured gluons. But perhaps history will repeat itself. Maybe 25 years from now a lecture at the Banff Summer School will begin with the statement “Once upon a time physicists believed that quarks and gluons were elementary, and that Quantum Chromodynamics (QCD) was the analog of QED for strong interactions. Then ... ??????”


Quark Model Strange Quark Mass Splitting Quantum Chromo Dynamic Spin Splitting 
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Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • H. J. Lipkin
    • 1
  1. 1.The Weizmann Institute of ScienceRehovotIsrael

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