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But this Lagrangian describes something that does exist: $$ \mathcal{L}_H = \left|\left(\partial_\mu -i g W_\mu^a \tau^a -i\frac{1}{2} g' B_\mu\right)\phi\right|^2 + \mu^2 \phi^\dagger\phi-\lambda (\phi^\dagger\phi)^2 $$ You might be feeling this existence everywhere. Contact your local physicist if you don't.