Lepton-pair production in hadronic processes via a two-photon exchange mechanism

We give some details of the calculation of the cross-section for muon-pair production in hadron-hadron scattering via a two-photon exchange mechanism, together with numerical results. This two-photon process is found to become significant compared to the familiar single-photon (Drell-Yan) process at very high (e.g. ISABELLE) energies, although in certain restricted kinematic regions it has a measurable cross-section itself under currently attainable experimental conditions. Some suggestions as to how this process can be observed separately from the single-photon background in present and future experiments are also given.