Symmetries in nonlinear Bethe-Heitler process

TL;DR

This paper investigates the symmetry properties of electron-positron pair creation in a bichromatic laser field using strong-field QED, revealing that these symmetries are determined by the vector potential rather than the electric field.

Contribution

It uncovers the fundamental role of the vector potential in governing symmetry properties of pair production in nonlinear Bethe-Heitler processes.

Findings

Symmetry of angular distributions depends on the vector potential.

Electric field components do not primarily influence the symmetry.

Results enhance understanding of laser-matter interactions in strong fields.

Abstract

Nonlinear Bethe-Heitler process in a bichromatic laser field is investigated using strong-field QED formalism. Symmetry properties of angular distributions of created $e^-e^+$ pairs are analyzed. These properties are showed to be governed by a behavior of the vector potential characterizing the laser field, rather than by the respective electric field component.