Application of partial wave analysis in multiphoton pair production

TL;DR

This paper applies partial wave analysis to study electron-positron pair production in multiphoton regimes, revealing detailed momentum and angular momentum structures and their relation to vortex features.

Contribution

It introduces a novel application of partial wave analysis to multiphoton pair production, linking spectral features with angular momentum and vortex structures.

Findings

Angular distribution results are consistent across analytical and Dirac-Heisenberg-Wigner methods.

Partial wave analysis identifies momentum valleys and peaks related to multiphoton rings.

The study enhances understanding of angular momentum in pair production spectra.

Abstract

Electron-positron pair production is investigated in the multiphoton regime under polarized fields. Partial wave analysis can be applied to reveal the momentum spectral structure and identify the positions of valleys/peaks of the multiphoton rings by combining with $CP$ conservation. Moreover, considering the spin states of created pairs in partial wave analysis, the particle orbital angular momentum associated with the valleys/peaks can also be identified from multiphoton rings. It is found that the results for angular distribution by this approximate analytical treatment and by the Dirac-Heisenberg-Wigner formalism are consistent with each other. The present results are helpful for understanding the angular momentum information in momentum spectra, and they also have an implication for revealing the vortex structure near the valleys.