Gauge bosons are quantum fields and their associated elementary particles that mediate the fundamental interactions in gauge theories, forming a many-body quantum field system characterized by specific gauge symmetries. In the Standard Model, they include the massless photon for U(1) electromagnetic interactions, eight massless gluons for SU(3) color interactions, and the massive W± and Z⁰ bosons for SU(2)×U(1) electroweak interactions after spontaneous symmetry breaking via the Higgs mechanism. As a physical system, gauge bosons exhibit self-interactions in non-Abelian gauge theories, govern charge screening or confinement behavior, and determine the dynamical structure of force propagation at quantum and relativistic scales.
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