Over the past several years a theory of the strong interactions known as quantum chromodynamics has been developing. This theory assumes the existence of fractionally charged quarks of spin 1/2 and that the force between the quarks is carried by a gluon, a massless spin‐1 quantum. Like the quark, it is widely believed that the gluon is not directly observable.

Topics
Bosons, Quantum chromodynamics, Quarks
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© 1980 American Institute of Physics.
1980
American Institute of Physics
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