Feynman diagram for radiative transition

  1. 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. jcsd
  3. mfb

    Staff: Mentor

    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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