I need to calculate the transition probability of this process:

e- ----> photon+photon+ e-

Using the feynman rules I obtain the element:

$\langle f|\Delta|i\rangle=\langle u^s(p)\epsilon_{\mu}\epsilon_{\nu}|(-i\lambda\gamma_{\mu})\dfrac{i(\not{p}+m)}{p^2-m^2+i\epsilon}(-i\lambda\gamma_{\nu})|u^s(p')\rangle$

But i have no idea of how to continue.

I have seen a lot of webs and books but I can't find this process, ¿can someone help me?

Thank you all for your time.


closed as off-topic by Ben Crowell, ZeroTheHero, Jon Custer, A.V.S., Kyle Kanos Feb 10 at 12:29

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  • 1
    $\begingroup$ I've added the homework-and-exercises tag. In the future, please use this tag on this type of question. $\endgroup$ – Ben Crowell Feb 6 at 17:24
  • 1
    $\begingroup$ Electrons don’t spontaneously emit photons. They only do this when interacting with another charge or passing through an electromagnetic field. $\endgroup$ – G. Smith Feb 6 at 17:29