Spin-Resolved Decay of Axion-Like Particles into Electron--Positron Pairs in Strong Electromagnetic Fields
This research investigates how an axion-like particle decays into an electron-positron pair when subjected to intense laser fields. Using a specific mathematical framework, researchers derived a compact formula for the decay rate that accounts for both the particle's mass and the spin of the resulting leptons. The findings show that the quantum state of the produced pair changes significantly depending on whether it is near or far from energy thresholds, providing new ways to distinguish between different production mechanisms.