Are Leptons and Quarks Really Fundamental Particles?

As far as we know, quarks and leptons are infinitesimally small and have no internal structure. Perhaps in the future we will discover that our present "fundamental" particles are no more elementary than the elements.

Attempts have been made to simplify the Standard Model and explain the generations of quarks with theories involving smaller structures within quarks and leptons. So far this direction of study has not yielded any progress, nor is there any experimental evidence which suggests such structure.

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