Hadrons and Isospin
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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.
KeywordsCharge 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
Extension of the isospin concept to 7r mesons and experimental observations
Extension of the isospin concept to strange particles
- Gell-Mann, M. and Pais, A., Phys. Rev. 97 (1955) 1387Google Scholar
Weak interactions in general
- Marshak, R. E., Riazzuddin and Ryan, C. P., Theory of Weak Interactions in Particle Physics. Wiley-Interscience, New York 1969Google Scholar