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Neutrinos come in 3 flavors: electron neutrino, muon neutrino, and tau neutrino.

Quarks come in 6 flavors: up, down, top, bottom, strange and charm.

And lets not forget electron, muons and taus too.

Photon is not a massive particle since it has 0 invariant mass.

Why only massive particles can come in many flavors? It is just a co-incidence so maybe there could be more flavors we haven't discovered?

Qmechanic
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user6760
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1 Answers1

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No one knows why the universe is so constructed; as far as is known, the two more massive generations aren't required to account for phenomena or solve problems in the realm of the first generation.

As pointed out by Rob in his comment, experimental data can be used to place a limit of 3 on the possible number of generations.

niels nielsen
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