Nonlinear lepton-photon interactions in external background fields
Abstract
Nonlinear phenomena of lepton-photon interactions in external backgrounds with a generalised periodic plane-wave geometry are studied. We discuss nonlinear Compton scattering in head-on lepton-photon collisions extended properly to beyond the soft-photon regime. In addition, our results are applied to stimulated lepton-antilepton pair production in photon collisions with unrestricted energies. Derivations are considered semi-classically based on unperturbed fermionic Volkov representations encoding the full interaction with the background field. Closed expressions for total probabilities considering S-matrix elements have been derived. The general formula is applied to Compton scattering by an electron propagating in an external laser-like background. We obtain additive contributions in the extended unconstrained result which turns out to be stringently required in the highly nonlinear regime. A detailed comparison of contributing harmonics is discussed for various field parameters.
Cite
@article{arxiv.1602.01057,
title = {Nonlinear lepton-photon interactions in external background fields},
author = {Ibrahim Akal and Gudrid Moortgat-Pick},
journal= {arXiv preprint arXiv:1602.01057},
year = {2016}
}
Comments
39 pages, 8 figures, minor changes in introduction, references added, a few misprints found