I have a problem in deriving the formula :(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\left \langle p^\prime | iT | p \right\rangle = -2\pi i\widetilde{ V}(q)\delta(E_{p^\prime}-E_{p})[/tex]

which is in Peskin's QFT book. How to derive it?

Is there anything to do with [tex] \psi = e^{i\vec{k}\cdot\vec{r}}+\frac{f(\theta)}{r}e^{i\vec{k^\prime}\cdot\vec{r}}[/tex] ?

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# S-Matrix in non-relativistic limit

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