Infrared limit in external field scattering

TL;DR

This paper investigates electron/positron scattering by classical electromagnetic waves in the infrared limit, showing the scattering operator exists and has physical effects despite a trivial cross-section.

Contribution

It demonstrates the existence of a meaningful scattering operator in the infrared limit for external field scattering, highlighting physical effects beyond the cross-section.

Findings

Scattering operator exists in the infrared limit.

Physical effects are present despite trivial cross-section.

Infrared limit analysis clarifies scattering behavior in external fields.

Abstract

Scattering of electrons/positrons by external classical electromagnetic wave packet is considered in infrared limit. In this limit the scattering operator exists and produces physical effects, although the scattering cross-section is trivial.