Are leptons all alike?

Credit: Sandbox Studio

When the tau lepton was discovered in the 1970s, it didn’t resolve any outstanding mysteries—it raised new ones. 

Aside from its comparatively enormous mass, the tau had all the same properties as the two other charged leptons: the electron and muon. As one of its discoverers, Martin Perl, put it: “But why three?” 

You can read the article here.

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