Hadrons and Isospin



The six known leptons and their charge conjugates fall naturally into a simple pattern of classification suggestive of an underlying symmetry that may eventually lead to an uncovering of their dynamical laws. In contrast, the situation is vastly more complex with the hadrons because of their larger number and greater diversity. Nevertheless, similarities and relationships do exist among mesons and baryons, which have gradually come to light through both experimental and theoretical efforts. The experiments carried out and the ideas put forth during an effervescent period of over thirty years — roughly from 1932, when Werner Heisenberg introduced the concept of isospin, to the early 1960s, when Murray Gell-Mann and Yuval Ne’eman proposed the notion of the eightfold way — have contributed significantly to shaping our present-day view of the particles and their interactions. They form the subject matter of the present and the next chapters.


Charge Conjugate Strange Particle Isospin Violation Pion Field Isospin State 
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Suggestions for Further Reading

The idea of proton and neutron as two states of the nucleon and the isospin concept

  1. Cassen, B. and Condon, E. U., Phys. Rev. 50 (1936) 846ADSCrossRefGoogle Scholar
  2. Heisenberg, W., Z. Phys. 77 (1932) 1MathSciNetADSCrossRefGoogle Scholar

Extension of the isospin concept to 7r mesons and experimental observations

  1. Bjorkland, R. et al., Phys. Rev. 77 (1950) 213CrossRefGoogle Scholar
  2. Carlson, A. G. et al., Phil. Mag. 41 (1950) 701Google Scholar
  3. Kemmer, N., Proc. Cambridge Phil. Soc. 34 (1938) 354Google Scholar
  4. Lattes, C. M. G., Muirhead, H., Powell, C. F. and Occhialini, G. P., Nature 159 (1947) 694ADSCrossRefGoogle Scholar

Extension of the isospin concept to strange particles

  1. Gell-Mann, M., Phys. Rev. 92 (1953) 833MathSciNetADSCrossRefGoogle Scholar
  2. Gell-Mann, M. and Pais, A., Phys. Rev. 97 (1955) 1387Google Scholar
  3. Nishijima, K., Progr. Theor. Phys. 12 (1954) 107; ibid. 13 (1955) 285MathSciNetzbMATHGoogle Scholar


  1. Lee, T. D. and Yang, C. N., Nuovo Cimento 3 (1956) 749MathSciNetCrossRefGoogle Scholar
  2. Michel, L., Nuovo Cimento 10 (1953) 319zbMATHCrossRefGoogle Scholar
  3. Pais, A. and Jost, R., Phys. Rev. 87 (1952) 871ADSzbMATHCrossRefGoogle Scholar

Weak interactions in general

  1. Marshak, R. E., Riazzuddin and Ryan, C. P., Theory of Weak Interactions in Particle Physics. Wiley-Interscience, New York 1969Google Scholar

Neutral weak currents

  1. Hung, P. Q. and Sakurai, J. J., The structure of neutral currents. Ann. Rev. Nucl. Part. Sci. 31 (1981) 375ADSCrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  1. 1.Physics DepartmentUniversité LavalSte-FoyCanada
  2. 2.Laboratoire de Physique Théorique et Hautes EnergiesUniversités Paris VI et VIIParis Cedex 05France

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