(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Consider the scattering of a scalar electron and a spin half muon, draw and label the feynman diagram for this process.

write down the invariant amplitude M and the spin average |M|^2, use the trace notation.

2. Relevant equations

Photon propagator

$$\dfrac {-i\eta_{\mu\nu}}{k^2}$$

3. The attempt at a solution

Ok so I have written down what I think the correct labelled feynman diagram is, apologies that its attached as a photo, I did draw it in latex but it doesn't want to compile on here. It's possible I havn't gone about this the correct way, I can't find any examples of scalar particles scattering with spin half particles so I just tried it the only way I could think of. I'm not sure how to write the spin average matrix in terms of traces, I know it should have something to do with the fact that are multiple spin states for the initial and final states of the muon (two) but I don't know how to rwite this down mathematically. Any guidance would be greatly appreciated :)

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# Homework Help: Scalar electron-muon scattering

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