Thread: Photon Decay View Single Post

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Re your question about $2\gamma\rightarrow4\gamma$, I don't see any reason why it couldn't happen. There isn't any requirement for the decay products to be collinear as there is in $\gamma\rightarrow3\gamma$, so the phase-space volume doesn't vanish. But it has six vertices, so I would expect it to be very low in cross-section compared to $2\gamma\rightarrow2\gamma$.