Vortex Breit-Wheeler Electron-positron pair creation via vortex gamma-photons

TL;DR

This paper explores how orbital angular momentum in vortex gamma-photons influences electron-positron pair creation, revealing OAM transfer, unique density structures, and polarization effects through full-vortex QED analysis.

Contribution

It introduces a complete vortex QED framework for the Breit-Wheeler process, deriving OAM-dependent selection rules and revealing new OAM spectra in vortex particle collisions.

Findings

Demonstrates OAM transfer to created pairs.

Reveals hollow and ring-shaped density structures.

Shows anti-symmetric spin polarization in results.

Abstract

Particles in quantum vortex states (QVS) carrying definite orbital angular momenta (OAM) brings new perspectives in various fundamental interaction processes. When unique properties arise in the QVS, understanding how OAM manifest itself between initial particles and the outcome in vortex particle collisions becomes essential. This is made possible by applying the complete vortex description for all involved particles such that angular momenta (AM) are represented by explicit quantum numbers and their connections are naturally retrieved. We demonstrate the full-vortex quantum-electrodynamics (QED) results for the Breit-Wheeler pair creation process and derive the AM-dependent selection rule. The numerically resolved cross-sections show anti-symmetric spin polarization and most importantly, the first OAM spectra in vortex collision processes. The latter reveals efficient conversion of OAM to created pairs, leading to featured hollow and ring-shaped structure in the density distribution. These results demonstrate a clear picture in understanding the OAM physics in the scattering processes of high energy particles.