Polarization of the electron and positron produced in combined Coulomb and strong laser fields

Abstract

The process of $e^{+}{e}^{-}$ production in the superposition of a Coulomb and a strong laser field is considered. The pair production rate integrated over the momentum and summed over the spin projections of one of the particles is derived exactly in the parameters of the laser field and in the Born approximation with respect to the Coulomb field. The case of a monochromatic circularly polarized laser field is considered in detail. A very compact analytical expression of the pair production rate and its dependence on the polarization of one of the created particles is obtained in the quasiclassical approximation for the experimentally relevant case of an undercritical laser field. As a result, the polarization of the created electron (positron) is derived.

16 pages, no figures

References in corpus (7)

• Momentum signatures for Schwinger pair production in short laser pulses with a sub-cycle structure
• Pair production in laser fields oscillating in space and time
• Barrier control in tunneling e^+ e^- photoproduction
• Polarization operator approach to electron-positron pair production in combined laser and Coulomb fields
• Electron-positron pair creation by Coulomb and laser fields in the tunneling regime
• Few-Photon Electron-Positron Pair Creation by Relativistic Muon Impact on Intense Laser Beams
• Bound-free ${\mathbf{e}}^{+}{\mathbf{e}}^{-}$ pair creation with a linearly polarized laser field and a nuclear field

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• Laser-driven lepton polarization in the quantum radiation-dominated reflection regime