Trident Pair Production in Colliding Bright X-ray Laser Beams

TL;DR

This paper investigates a resonant electron-positron pair production process induced by two colliding X-ray laser beams, revealing how laser configuration and angles influence production rates and positron energies.

Contribution

It introduces a laser-dressed QED approach to analyze pair production in non-plane wave X-ray laser fields, highlighting novel features compared to plane-wave scenarios.

Findings

Production rate depends on laser angles and electron momentum.

Non-plane wave laser fields induce unique pair production characteristics.

Positron energy distribution varies with laser configuration.

Abstract

The magnificent development of strong X-ray lasers motivates the advancement of pair production process studies into higher laser frequency region. In this paper, a resonant electron-positron pair production process with the absorption of two X-ray photons is considered in the impact of an energetic electron at the overlap region of two colliding X-ray laser beams. Laser-dressed QED method is justified to tackle the complexity of the corresponding multiple Feynman diagrams calculation. The dependence of the production rate as well as the positron energy distribution on the relative angles among the directions of the two laser wave vectors and the incoming electron momentum is revealed. It is shown that the non-plane wave laser field configuration arouses novel features in the pair production process compared to the plane-wave case.