Abstract
The non-linear (strong-field) Breit-Wheeler $e^+e^-$ pair production by a probe photon traversing two consecutive short and ultra short (sub-cycle) laser pulses is considered within a QED framework. The temporal shape of the pulses and the distance between them are essential for the differential cross section as a function of the azimuthal angle distribution of the outgoing electron (positron). The found effect of a pronounced azimuthal anisotropy is important for sub-cycle pulses and decreases rapidly with increasing width of the individual pulses.
Highlights
The rapidly progressing laser technology [1] offers novel and unprecedented opportunities to investigate quantum systems with intense laser beams [2]
We extend that previous consideration to QED, where eþe− are fermions, and we concentrate our attention on the azimuthal angle distribution of the outgoing electron at fixed carrier envelope phase (CEP)
To be specific we consider the differential cross section dσ=dφeþ for subcycle pulse with N 1⁄4 1=2 as a function of azimuthal angle of positron momentum at different values of separation parameter G and fixed CEP φ 1⁄4 0 exhibited in the left panel of Fig. 3
Summary
Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany and Institut für Theoretische Physik, TU Dresden, 01062 Dresden, Germany (Received 3 July 2018; published 29 August 2018). The nonlinear (strong-field) Breit-Wheeler eþe− pair production by a probe photon traversing two consecutive short and ultrashort (subcycle) laser pulses is considered within a QED framework. The temporal shape of the pulses and the distance between them are essential for the differential cross section as a function of the azimuthal angle distribution of the outgoing electron (positron). The found effect of a pronounced azimuthal anisotropy is important for subcycle pulses and decreases rapidly with increasing width of the individual pulses
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