As the question suggests, I am interested if there is a "rule of the thumb" (or some similar "trick") that allows one to tell which set of subgraphs in the Standard Model are gauge invariant.

To be specific, say that we are looking at the 1 loop corrections for the vertex of two quarks ($q \bar{q}^\prime$) and a $W$ boson: $\Gamma_{q \bar{q}^\prime W}$. Is it possible to say which subset of the one loop corrections are gauge invariant and which are gauge dependent?


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