Abstract
The production of two photons by electrons and positrons in very-high-energy linear colliders is considered. The phase of the amplitude is discussed in detail and the dominant radiation zone is determined. The arguments that the multiphoton radiation is an incoherent process are confirmed. Exact agreement with the Blankenbecler-Drell "incoherent" formula for fractional energy losses is shown. A simple semiclassical explanation of the results is proposed
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