Wick theorem and explicit vanishing of $\text{vacuum}\to e\bar{e}$

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1 month ago

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I want to see explicitly how the transition amplitude for $\text{vacuum}\to e\bar{e}$ vanishes in QED but I'm struggling with Wick's theorem . I take $|i\rangle=|0\rangle$ and $|f\rangle=b^\dagger(... ...Read More

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