Second Order QED Processes in an Intense Electromagnetic Field

Abstract

Some non linear, second order QED processes in the presence of intense plane electromagnetic waves are investigated. Analytic expressions with general kinematics are derived for Compton scattering and $e^{+}{e}^{-}$ pair production in a circularly polarised external electromagnetic field. The differential cross sections were investigated numerically for photon energies up to 50 MeV, external field intensity parameter ${\nu }^2$ to value 2, and all scattering angles. The variation of full cross sections with respect to external field intensity was also established. The presence of the external field led to resonances in the Compton scattering and pair production differential cross sections. These resonances were investigated by calculating the electron self energy in the presence of the external field. At resonance the differential cross sections were enhanced by several orders of magnitude. The resonances occurred for values of external field intensity parameter ${\nu }^2<1$, lowering the limit of ${\nu }^2\sim 1$ at which point non linear effects in first order external field QED processes become important. Generally, full cross sections increased with increasing external field intensity, though peaking sharply for Compton scattering and levelling off for pair production. An application was made to non linear background studies at $e^{+}{e}^{-}$ linear colliders. The pair production process and electron self energy were studied for the case of a constant crossed electromagnetic field. It was found that previous analytic expressions required the external field to be azimuthally symmetric. New analytic expressions for the more general non azimuthally symmetric case were developed and a numerical parameter range equivalent to that proposed for future linear collider designs was considered.

The bulk of this 2006 PhD thesis comes from research performed during 1986-1994. Chapter 8 was added in 2005. Errata has been corrected in the intervening years

Cited by in corpus (8)

• Advances in QED with intense background fields
• Very Special Relativity as a background field theory
• Electron-positron annihilation into two photons in an intense plane-wave field
• Laser assisted Compton scattering of X-ray photons
• Absorption cross section in an intense plane wave background
• The generation of narrow ultrarelativistic beams of positrons (electrons) in the process of resonant photogeneration of pairs on nuclei in a strong electromagnetic field
• Enhanced, high energy photon production from resonant Compton scattering in a strong external field
• Dominance of $\gamma$-$\gamma$ electron-positron pair creation in a plasma driven by high-intensity lasers