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Worldsheep

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Gauge invariance ⇒ $Π

^{μν}

_{ϒϒ}(0) = Π

_{μν}

_{ϒZ}(0) = 0$

Where Π

_{VV'}is the V to V' one loop correction, ϒ is the photon field and Z is the Z-boson field. The argument of Π is the incoming momentum q

^{2}= 0