Feynman diagram for sigma+ -> n + pi+

makehhh
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Homework Statement



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

Homework Equations



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

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!
 

Attachments

  • sigma+ to proton pi+.JPG
    sigma+ to proton pi+.JPG
    5.4 KB · Views: 1,711
Last edited:
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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:
At least a W- and then a Z or a gamma.
 
So I think your diagram looks OK, but maybe someone else would like to confirm it.
 
My alternative was:
 

Attachments

  • feynman.png
    feynman.png
    954 bytes · Views: 927
Ah, yes that looks good, thanks for your help guys, much appreciated.
 

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