Preons are hypothetical particles that have been proposed as subcomponents of quarks and leptons, the fundamental building blocks of matter in the Standard Model of particle physics. The idea is that if preons exist, they could provide a deeper understanding of the structure of matter by explaining why quarks and leptons have the properties they do. The preon model suggests that quarks and leptons are not elementary particles themselves but rather composite particles made up of even smaller entities—preons.
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