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The sixth-order Feynman diagram

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Sketch the sixth-order Feynman diagram representing Delbruck scattering:
r + r -> r+ r. (This process, the scattering of light by light, has no analog in classical electrodynamics.)

This question is from the textbook 'Introduction to elementary particles' by David Griffiths.

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https://brainmass.com/physics/scattering/the-sixth-order-feynman-diagram-49991

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I did manage to open the sixth.jpg file after downloading it.

I have added to it the 3 topologically different 6th order diagrams for photon-photon scattering and an example of a different variant of one of them.

As I noted before it is not clear from your question whether you need all the variants (in particular, the A and B have their obvious variants in which electron ...

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