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Originally Posted by tony_fleming J.D. Jackson's latest edition of his wonderful book "Classical electrodynamics", 3rd Ed., 2000 |
in quantum electrodynamics, when 2 photons collide the product is an electron and a positron (both have mass). For higher energy regime, it takes 3 photons to produce an electron and a positron. These are the reversed processes of parapositronium and orthopositronium experiments done many years ago.