• Accepted Paper

Extremely high-energy bremsstrahlung in matter

Peter Arnold, Joshua Bautista, Omar Elgedawy, and Shahin Iqbal

Phys. Rev. Lett. - Accepted 6 October, 2026

DOI: https://doi.org/10.1103/rk4d-45t9

Abstract

The theory of bremsstrahlung e → eγ by extremely high energy electrons passing through ordinary matter has been qualitatively incomplete. We revisit the suppression of bremsstrahlung by the Landau-Pomeranchuk-Migdal (LPM) effect, here accounting for quantum disruption of that effect from pair production. Our analysis covers the full range of ultra-relativistic electron and photon energies (subject to a few simplifying approximations).

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