Summary
Elementary-particle lifetimes are quantized in powers of the fine-stucture constant α. The constituent quark model of Mac Gregor provides an explanation why the observed lifetimes are α-spaced. The dyonium model suggests that quarks are composed of electric and magnetic charges. It is the magnetic interactions which provide a clue to the origin of mass. Nambu first suggested an empirical mass spectrum of particles based upon the fine-structure constant.
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Akers, D. Dirac monopole and mac gregor’s formula for particle lifetimes. Nuov Cim A 105, 935–940 (1992). https://doi.org/10.1007/BF02730834
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DOI: https://doi.org/10.1007/BF02730834