Nonperturbative Bethe-Heitler pair creation in combined high- and low-frequency laser fields

TL;DR

This paper investigates how combining high- and low-frequency laser fields nonperturbatively enhances electron-positron pair creation by a relativistic proton beam, revealing increased rates and altered particle distributions.

Contribution

It demonstrates the significant enhancement of pair creation rates and distribution modifications due to the high-frequency component in a bichromatic laser field, using a nonperturbative approach.

Findings

High-frequency field boosts pair creation rate

Altered angular and energy distributions of particles

Effects observed in both nuclear rest and laboratory frames

Abstract

The nonperturbative regime of electron-positron pair creation by a relativistic proton beam colliding with a highly intense bichromatic laser field is studied. The laser wave is composed of a strong low-frequency and a weak high-frequency mode, with mutually orthogonal polarization vectors. We show that the presence of the high-frequency field component can strongly enhance the pair-creation rate. Besides, a characteristic influence of the high-frequency mode on the angular and energy distributions of the created particles is demonstrated, both in the nuclear rest frame and the laboratory frame.