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Barys means "heavy" in Greek language, because protons and neutros was what made most of the mass of known ordinary matter, as opposed notably to electrons.
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Baryons can be contrasted with:
  • mesons, which have an even number of elementary particles. The name meson comes from "medium" since the mass of their most common examples (which have two quarks rather than three as the most common baryons) is between the mass of the proton and the mass of the electron
  • leptons, which are much lighter particles such as the electron. Leptos means "fine, small, thin".
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Ancestors

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