The Standard Model Higgs field is a complex doublet of hypercharge . Its nonzero vacuum expectation value triggers the Higgs mechanism.
In the Higgs mechanism, gauge fields associated with broken generators acquire longitudinal polarizations and masses by absorbing Goldstone modes. Gauge fields of the unbroken subgroup remain massless.
Unitary gauge uses a gauge transformation to remove the Goldstone fields from the Higgs multiplet, leaving the physical radial Higgs excitation and massive vector fields.
The Higgs boson is the neutral radial excitation of the Higgs field about its vacuum expectation value.

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