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baryon |
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baryonIn nuclear physics, a heavy subatomic particle made up of three indivisible elementary particles called quarks. The baryons form a subclass of the hadrons and comprise the nucleons (protons and neutrons) and hyperons. |
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There are two unambiguous pieces of evidence for CP- and I-violation: the forbidden decay modes of neutral K and B mesons and the excess of the baryonic matter over antimatter in the present universe. He notes that dust in the Milky Way absorbs extreme-ultraviolet light and that the X-ray glow from our galaxy overwhelms the faint emissions from the baryonic gas. Of these, the amount of deuterium provides the most sensitive indicator of a key number in cosmology-the density of ordinary, or baryonic, matter, such as protons and neutrons. |
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