Feynman diagram for radiative transition

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SUMMARY

The discussion focuses on creating a Feynman diagram for the electromagnetic transition from ψ' to χ_{c} states. The participant contemplates the necessity of including multiple photons in the diagram, specifically questioning whether one or two photons should be represented. It is established that the number of photons in the diagram must match the final state, emphasizing the importance of accurately depicting electromagnetic decay processes in hadrons, which are often overshadowed by QCD binding dynamics.

PREREQUISITES
  • Understanding of Feynman diagrams
  • Knowledge of electromagnetic transitions in particle physics
  • Familiarity with quantum chromodynamics (QCD)
  • Basic concepts of hadron decay processes
NEXT STEPS
  • Research the construction of Feynman diagrams for electromagnetic transitions
  • Study the role of photons in particle decay processes
  • Explore quantum chromodynamics and its impact on hadron interactions
  • Learn about the specifics of ψ' and χ_{c} states in particle physics
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Particle physicists, students studying quantum mechanics, and researchers focusing on electromagnetic interactions and hadron decay processes.

kuecken
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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!
 
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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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