Physics Asked on November 30, 2020
I have a very naive question concerning Feynman diagrams: If we consider the process $pi^{+}rightarrow mu^{+}nu_{mu}$ via the weak interaction, then we get this Feynman Diagram according to Wikipedia:
Now, my question is the following: If I drew this diagram, is this also correct?
Or if I only exchanged the positions of $mu^{+}$ and $nu_{mu}$? Personally, I’d say yes, but I just wanted to double-check.
The current diagram, as drawn, is incorrect as the antimuon $mu^{+}$ and muon neutrino $nu_{mu}$ should have opposite arrows. However, if you were to reverse the arrows, the diagram would be correct as only the geometric topological properties of the Feynman diagram are relevant, and not the relative position of vertices.
Correct answer by Nihar Karve on November 30, 2020
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