Abstract
An analysis is given of the QED factors relating the cross section for ee→eeX to the virtual 2-photon collision γ ∗γ ∗→ X . Only transverse photons are considered, but no kinematical approximations are made. The cases where none, one or both of the scattered electrons are detected at angles ⪢ m e/ E ( E = beam energy) are separately considered. A full discussion is given of the kinematical restrictions necessary to arrive at factorisible equivalent photon approximation formulae, and quantitative comparisons are given. Also discussed are the rapidity distribution of the produced system X and restrictions on the effective two-photon luminosity due to angular cuts on produced particles.
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