Pair annihilation in laser pulses: optical vs. XFEL regimes
arXiv:1105.3475 · doi:10.1103/PhysRevA.84.032119
Abstract
We discuss the theory and phenomenology of pair annihilation, within an ultra-short laser pulse, to a single photon. The signature of this process is the uni-directional emission of single photons with a fixed energy. We show that the cross section is significantly larger than for two-photon pair annihilation in vacuum, with XFEL parameters admitting a much clearer signal than optical beams.
V2: 5 pages, 4 figures. Published version. Disucssion of optical case extended
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- Coherent enhancement of QED cross-sections in electromagnetic backgrounds