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In a book I'm reading, there is a sentence as follows:

Muons and taus are not extra-dimensional versions of electrons, because they don’t have a regular mass spacing and don’t have the same weak-force interactions as electrons.

What is regular mass spacing?

Please explain to me.

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  • $\begingroup$ $\uparrow$ Which book? $\endgroup$ – Qmechanic Mar 28 '18 at 4:47
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Presumably the book is talking about a Kaluza-Klein tower of particles, whose masses are regular spaced.

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