Multiple Bremsstrahlung in Gauge Theories at High-Energies. 4. The Process e+ e- ---> gamma gamma gamma gamma

Abstract We calculate the helicity amplitude and the cross section for the process e + e − → 4 γ in the high-energy limit. The resulting expressions are presented in a form which allows an easy numerical evaluation. They are valid for the kinematical configurations where at most two photons are emitted in directions nearly parallel to the lepton directions.