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Feynman diagram for sigma+ -> n + pi+

  1. Apr 17, 2009 #1
    1. The problem statement, all variables and given/known data

    Hello, I am trying to draw a Feynman Diagram at quark level for the decay sigma+ -> neutron + pi+.


    2. Relevant equations

    sigma+ -> neutron + pi+
    uus -> udd + udbar


    3. The attempt at a solution

    Well, the attachment is what I came up with. I have no idea if it's right to be honest, I can't see anything wrong with it, but I have no idea how to be methodical about these kinds of drawings, and haven't found any particle physics texts to be much help.

    Thanks for your help!
     

    Attached Files:

    Last edited: Apr 17, 2009
  2. jcsd
  3. Apr 17, 2009 #2

    nicksauce

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    Well I can't see your diagram yet, but I think the diagram requires both a W- boson and a Z boson in it.
     
    Last edited: Apr 17, 2009
  4. Apr 17, 2009 #3
    At least a W- and then a Z or a gamma.
     
  5. Apr 17, 2009 #4

    nicksauce

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    So I think your diagram looks OK, but maybe someone else would like to confirm it.
     
  6. Apr 17, 2009 #5

    nicksauce

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    My alternative was:
     

    Attached Files:

  7. Apr 18, 2009 #6
    Ah, yes that looks good, thanks for your help guys, much appreciated.
     
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