Question: In a pair annihilation experiment, an electron (mass m) with momentum Pe hits a positron (same mass, but opposite charge) at rest. They annihilate, producing

In a pair annihilation experiment, an electron (mass m) with momentum Pe hits a positron (same mass, but opposite charge) at rest. They annihilate, producing two photons. (Why couldn't they produce just one photon?) If one of the photons emerges at 60o to the incident electron direction, what is its energy?

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