We report on our calculation of the energy and angular dependence of the cross sections for the production of various particles by two-photon annihilation processes in e⁺e^- and e^-e^- colliding beams. For beam energy E of more than 1 GeV, these cross sections [σ∝α⁴(lnE)³] become increasingly more important than the usual one-photon cross sections [σ∝α²(E)^-2] for hadron production.
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Brodsky et al. (1970) studied this question.
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