A Feynman diagram for bound particle output

JonAce73
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Feynman diagram for bound particle output
I am interested on how Feynman diagram is formed from a differential equation model of particle interaction wherein the incoming particles are not bound (e.g., separated neutron, proton and electron) and one or more of the outgoing particles are bound (e.g., hydrogen atom). However, I had never found any literature that deal with my topic of interest. I would highly appreciate if anyone can provide me with a bibliography of a paper on this topic.
 
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A-level means "graduate level". Are you sure that's what you want? From the question, I think it's not likely you have done any calculations with Feynman diagrams. Have you? If so, which ones?
 

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