Finite size effects in stimulated laser pair production

Details Finite size effects in stimulated laser pair production Finite size effects in stimulated laser pair production

2010-02-21

arxiv.org/abs/1002.4018v2

Phys.Lett.B692:250-256,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 7 EPS figures. Version 2 contains additional examples using smooth pulse envelopes. Conclusions unchanged

Scientific paper

10.1016/j.physletb.2010.07.044

We consider stimulated pair production employing strong-field QED in a high-intensity laser background. In an infinite plane wave, we show that light-cone quasi-momentum can only be transferred to the created pair as a multiple of the laser frequency, i.e.\ by a higher harmonic. This translates into discrete resonance conditions providing the support of the pair creation probability which becomes a delta-comb. These findings corroborate the usual interpretation of multi-photon production of pairs with an effective mass. In a pulse, the momentum transfer is continuous, leading to broadening of the resonances and sub-threshold behaviour. The peaks remain visible as long as the number of cycles per pulse exceeds unity. The resonance patterns in pulses are analogous to those of a diffraction process based on interference of the produced pairs.

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