Abstract
By starting from a mass matrix with family-independent mixing (the so-called “democratic” family mixing) and by requiring some simple constraints on the additional mass terms, but without any small parameters, a mass relation which is in excellent agreement with experiment is derived for charged leptons.
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Koide, Y. Charged lepton mass matrix with democratic family mixing. Z. Phys. C - Particles and Fields 45, 39–41 (1989). https://doi.org/10.1007/BF01556669
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DOI: https://doi.org/10.1007/BF01556669