Abstract
By 1960 a great number of particles (which decay weakly) and resonances (which decay strongly) had been discovered. Some are seen in production reactions, where they are produced along with other final-state particles (such as the ω meson in p\(\bar p\) → π+π− ω), others in formation reactions, where they are the only products of collisions between the incident particles (such as the isobar resonance Δ in πp →Δ). This proliferation of particles and resonances calls for an organizing scheme more powerful than the Gell-Mann-Nishijima relation — in fact, a model that could embody the main features of known symmetry principles, establish or suggest relationships among particles, and provide a good basis for an eventual dynamic approach.
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Suggestions for Further Reading
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Ho-Kim, Q., Pham, XY. (1998). Quarks and SU(3) Symmetry. In: Elementary Particles and Their Interactions. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03712-6_7
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DOI: https://doi.org/10.1007/978-3-662-03712-6_7
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