Imagine that two electrons interact by exchanging a virtual photon.(adsbygoogle = window.adsbygoogle || []).push({});

Electron A gains momentum ##-\vec{p}## and electron B gains momentum ##\vec{p}##.

If the two momentum vectors are not collinear then there will be extra angular momentum left over from the interaction.

In a simple Coulomb interaction the momenta of A and B are collinear but I would have thought that in a general interaction they would not be. In that case how would angular momentum be conserved?

PS As the photon is virtual there isn't anything left in the EM field.

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# Angular momentum in particle interaction

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