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Given

https://www.researchgate.net/publication/323384550_ELECTROWEAK_INTERACTION_AND_ITS_TESTS_Bachelor_Thesis

I wonder why are there two photons entering in a) pair production? Isn't it one photon resulting in $e^+e^-$ ?

Qmechanic
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Ben
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1 Answers1

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It is not possible to satisfy both energy and momentum conservation with only one photon.

mike stone
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