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arxiv: 0804.1315 · v1 · submitted 2008-04-08 · ✦ hep-ph

The six-photon amplitude

classification ✦ hep-ph
keywords six-photonabsenceamplitudediagramsdoubleenoughexternalgood
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Thanks to the absence of tree order, the six-photon processes is a good laboratory to study multi-leg one-loop diagrams. Particularly, there are enough on-shell external legs to observe a special Landau singularity: the double parton scattering.

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