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MENTAL MODEL · M6009

Higgs Mechanism

Higgs Mechanism
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

In the Standard Model, the Higgs mechanism is a mechanism that generates mass, enabling elementary particles to acquire mass. Why do fermions, W bosons, and Z bosons have mass, while photons and gluons are massless? The Higgs mechanism can explain this. It applies spontaneous symmetry breaking to give mass to gauge bosons. Among all possible mechanisms that can give mass to gauge bosons while respecting gauge theory, this is the simplest. According to the Higgs mechanism, the Higgs field pervades the universe, and some elementary particles acquire mass through their interaction with the Higgs field. More precisely, in gauge field theory, to satisfy local gauge invariance, gauge bosons must be massless. Since the vacuum expectation value of the Higgs field is non-zero, spontaneous symmetry breaking occurs, causing gauge bosons to acquire mass and generating a massless boson called the Goldstone boson. The Higgs boson is the particle associated with the Higgs field, being the vibration of the field. By choosing an appropriate gauge, the Goldstone boson is absorbed, leaving only the massive Higgs boson and massive gauge vector fields.

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In the Standard Model, the Higgs mechanism is a mechanism that generates mass, enabling elementary particles to acquire mass. Why do fermions, W bosons, and Z bosons have mass, while photons and gluons are massless? The Higgs mechanism can explain this. It applies spontaneous symmetry breaking to give mass to gauge bosons. Among all possible mechanisms that can give mass to gauge bosons while respecting gauge theory, this is the simplest.

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The Higgs mechanism is a mechanism in particle physics that gives mass to elementary particles through spontaneous breaking of gauge symmetry: the Higgs field is non-zero everywhere in vacuum, and the stronger the coupling of a particle to it, the greater the inertia (mass) it acquires.

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