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Standard Model of Elementary Particles and Forces
Physics experiments of the past hundred years have revealed the atom's structure, with its nucleus and orbiting electrons. Today's experiments use powerful particle accelerators to explore the deepest substructure of matter, the particles and forces inside the proton and neutron of the atom's nucleus. Decades of research have now given us a remarkably simple theoretical model of the elementary particles and forces of matter.
The discovery of the top quark at Fermilab in March, 1995, provided strong evidence for the Standard Model, the prevailing theory that describes the elementary particles and forces. These particles are the matter particles called leptons and quarks; and the force-carrying particles called bosons.
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