Strong-Field Breit-Wheeler Pair Production in Two Consecutive Laser Pulses with Variable Time Delay
arXiv:1612.07137 · doi:10.1016/j.physletb.2016.12.056
Abstract
Photoproduction of electron-positron pairs by the strong-field Breit-Wheeler process in an intense laser field is studied. The laser field is assumed to consist of two consecutive short pulses, with a variable time delay in between. By numerical calculations within the framework of scalar quantum electrodynamics, we demonstrate that the time delay exerts a strong impact on the pair-creation probability. For the case when both pulses are identical, the effect is traced back to the relative quantum phase of the interfering S-matrix amplitudes and explained within a simplified analytical model. Conversely, when the two laser pulses differ from each other, the pair-creation probability depends not only on the time delay but, in general, also on the temporal order of the pulses.
7 pages, 5 figures
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- Momentum spirals in multiphoton pair production revisited
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