Retrieving "Gauge Fixing Term" from the archives

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1. Gauge Structure (or Gauge Symmetry)

   Linked via "gauge-fixing term"

   $$Z[J] = \int \mathcal{D}A \mathcal{D}\psi \mathcal{D}\bar{\psi} \exp\left(i \int d^4x (\mathcal{L} + J \phi)\right)$$
   To enforce gauge invariance in the integration measure, a gauge-fixing term $\mathcal{L}_{GF}$ and associated Faddeev-Popov ghosts ($\eta, \bar{\eta}$) are added:
   $$\mathcal{L}{\text{total}} = \mathcal{L}{\text{Dirac/Yang-Mills}} + \mathcal{L}{GF} + \mathcal{L}{\text{Ghost}}$$