For a an interaction term like $g(\overline{\psi} \gamma^\mu \psi) \partial_\mu \phi$ in which $\psi$ is a Dirac spinor and $\phi$ a scalar field (d=4), should we expect this vertex to have a momentum associated with it (from the $\partial_\mu \phi$)? If so, what is the meaning of a vertex "generating" momentum?
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