Abstract
The general analysis ofμ+μ− (or e+e−) pair production from any unpolarized initial state of strongly interacting particles is given to lowest order in the electromagnetic interaction. The process is completely described by five real form factors that are simply related to the density matrix elements for the production of a virtual photon which then decays into the pair. The angular distribution of theμ+μ− pairs in their center of momentum and their polarizations are computed in terms of the form factors. By measuring the angular distribution and polarizations of the pair one can determine all five form factors and thereby investigate the structure of the production process. Finally, some peripheral-meson-exchange models of the process are considered.
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