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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.

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

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  • "Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See our meta site for more guidance on how to edit your question to make it better" – Ben Crowell, ZeroTheHero, Jon Custer, A.V.S., Kyle Kanos
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ 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
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    $\begingroup$ 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