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Feynman Diagram Help

  1. May 16, 2015 #1
    1. The problem statement, all variables and given/known data:

    For the decay of the ∆+ → n + π+, sketch an appropriate quark-level Feynman diagram.

    State which interaction is responsible for this decay.

    3. The attempt at a solution

    This is more of a question to see if I'm doing it right more than anything. The first Feynman diagram is one where the strong force is responsible for the decay. The second one is one where the weak force is responsible, I'm not to sure if i'm allowed to do it both ways but if am how can I tell which one to use?
    FullSizeRender 2.jpg
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  2. jcsd
  3. May 16, 2015 #2

    Orodruin

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    Both are allowed, but which do you think dominates?
     
  4. May 17, 2015 #3
    strong force? Its a much stronger reaction.
     
  5. May 17, 2015 #4

    Orodruin

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    Yes, and so we call it a strong decay.
     
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