Photon Interactions at the Highest Energies

Elsa Couderc and Spencer Klein


At very high energies, photon interactions change character. The pair production cross-section is greatly reduced by the LPM effect, and photonuclear interactions predominate. We will review the cross-sections for these processes, and also introduce a new process - coherent rho photoproduction in
bulk matter; this latter process is akin to kaon regeneration.