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!