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On the classification of fundamental particles

  • Published:
Il Nuovo Cimento (1955-1965)

Summary

A new four-dimensional isotopic spin formalism is developed for the heavy fundamental particles. All particles correspond to singlevalued representations of the rotation group and there is complete symmetry between the isotopic properties of fermions and bosons. The resulting classification is similar to Gell-Mann’s except that the degeneracy in the classification of the K-mesons is removed. The forms of the strong interactions are given explicitly. The physical consequences of the theory are discussed in detail. In particular it predicts the existence of a neutral K-meson of lifetime ∼ 10−19 s. A new experimental technique for detecting this particle is suggested.

Riassunto

Si sviluppa per le particelle pesanti fondamentali un nuovo formalismo assumendo lo spin isotopico quadridimensionale. Tutte le particelle corrispondono a rappresentazioni ad un unico valore del gruppo rotazionale e si ha completa simmetria tra le proprietà isotopiche dei fermioni e dei bosoni. La classificazione risultante è simile a quella di Gell-Mann, salvo che scompare la degenerazione nella classificazione dei mesoni K. Le forme dell’interazione forte sono date esplicitamente. Si discutono dettagliatamente le conseguenze fisiche della teoria. In particolare questa predice l’esistenza di un mesone K neutro di vita media ∼ 10−19 s. Si suggerisce una nuova tecnica sperimentale per la scoperta di questa particella.

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Salam, A., Polkinghorne, J.C. On the classification of fundamental particles. Nuovo Cim 2, 685–690 (1955). https://doi.org/10.1007/BF02725032

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  • DOI: https://doi.org/10.1007/BF02725032

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