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!
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!
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