Thursday 6 July 2017

particle physics - Origin of lepton/quark generations?


What theoretical explanations exist for the fact that there are three generations of leptons and quarks?


I'm not so much asking why there are exactly 3 generations, but rather what makes electron, muon and tau differ. Also, since the three families of quarks don't have to be a priori related to the three families of leptons, I'm interested in answers for either quarks, leptons, or both.




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