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Feynman diagram for radiative transition 
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#1
Mar2914, 07:51 AM

P: 16

Hi,
I was just trying to draw a Feynman diagram for ψ' to [itex]χ_{c}[/itex] states. So we have a electromagnetic transition. I feel tempted to just have c and [itex]\bar{c}[/itex] coming in and letting a γ leave from one of the legs. But that looks like an incomplete Feynman diagram to me. Maybe I have to get two photons out? Can someone help me with this please! 


#2
Mar2914, 08:09 AM

Mentor
P: 11,928

You need as many photons as there are photons in the final state. Feynman diagrams for electromagnetic decay of hadrons are a bit boring, as the interesting part happens in the QCD binding which you cannot include in that way.



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