Strong-field Breit-Wheeler pair production with bremsstrahlung gamma-rays in the perturbative-to-nonperturbative transition regime

TL;DR

This paper investigates electron-positron pair production via bremsstrahlung gamma-rays in high-intensity lasers, analyzing how the broad gamma-ray spectrum influences the transition from perturbative to non-perturbative regimes, revealing shifts in contributing frequencies and signatures of laser-dressed mass.

Contribution

It provides a detailed analysis of the spectral effects and transition dynamics in Breit-Wheeler pair production with bremsstrahlung gamma-rays in intense laser fields.

Findings

Continuous shift in bremsstrahlung frequency contributions during the transition

Identification of signatures of laser-dressed particle mass

Analysis of energy and angular distributions of produced pairs

Abstract

Photoproduction of electron-positron pairs by bremsstrahlung gamma-rays propagating through a high-intensity optical laser wave is studied. By calculating total pair production yields as well as energy and angular distributions of the produced particles for a range of laser intensities, we analyze the influence that the broad frequency spectrum of bremsstrahlung exerts on the properties of the process in the transition region between the perturbative and non-perturbative interaction regimes. In particular, we demonstrate a continuous shifting of the mainly contributing interval of bremsstrahlung frequencies during the course of the transition and indicate characteristic signatures of the laser-dressed particle mass.