 Gauge-boson propagator

ID: gauge-boson-propagator

For the Euclidean covariant gauge term

(\partial_{μ} A^{μ})^{2} / (2 ξ)

D_{μν} (k) = \frac{1}{k ^{2}} (δ_{μν} + (ξ - 1) \frac{k _{μ} k _{ν}}{k ^{2}}) .

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