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arxiv: hep-ph/0505220 · v1 · submitted 2005-05-25 · ✦ hep-ph

The strange formula of Dr. Koide

classification ✦ hep-ph
keywords formulakoidebibliographicaldevelopmentsextensionshistoricalleptonmass
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We present a short historical and bibliographical review of the lepton mass formula of Yoshio Koide, as well as some speculations on its extensions to quark and neutrino masses, and its possible relations to more recent theoretical developments.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. A minimization theorem for the Koide ratio and its Standard Model calibration

    hep-ph 2026-05 conditional novelty 7.0

    A theorem establishes that the one-particle extension of any Koide-ratio mass set reaches a unique minimum Qmin = Q0/(1+Q0) at m* = [(sum mi)/(sum sqrt(mi))]^2, with the lepton-plus-charm case landing 6 ppm above the ...

  2. A minimization theorem for the Koide ratio and its Standard Model calibration

    hep-ph 2026-05 unverdicted novelty 6.0

    Extending any positive-mass set by one particle minimizes the Koide ratio to Q0/(1+Q0) at m* = [(sum mi)/(sum sqrt(mi))]^2; adding the charm mass to leptons yields a value only 6 ppm above the ideal 2/5.