The production in hadron collisions of a pair of virtual photons, each having a large invariant mass, proceeds via two mechanisms: (a) two independent Drell-Yan-type annihilations of quark pairs in a single interaction and (b) the pair annihilation process qq̄→γ*γ*. We argue that both mechanisms allow intriguing tests of constituent structure and its associated scaling laws and we show that, despite their α⁴ production rate, events of this type are accessible with existing π and proton beams.
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Goebel et al. (1980) studied this question.
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