theory (physics), model (physics)
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Besides the forces of electromagnetism and gravity there are two more fundamental gauge fields in the standard model of particle physics.
The weak nuclear force is described by a gauge field with gauge group the special unitary group . It controls aspects of the beta decay?.
The weak nuclear force is described by a gauge field with gauge group the special unitary group (QCD . It governs the interaction between quarks.
Wikipedia, Weak interaction
Wikipedia, Strong interaction