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We consider the production of a lepton-antilepton pair by real photons off ahadronic target. The interference of one and two photon exchange amplitudesleads to a charge asymmetry term that may be calculated explicitly in thelarge-t limit in terms of hadronic distribution amplitudes. A rather compactexpression emerges for the leading order asymmetry at fixed angle in thecentre-of-mass of the lepton pair. The magnitude appears sizeable and isapproximately independent of the pair mass in the asymptotic limit.Comment: 14 pages, 7 figures. Title changed, references adde

Two-photon effects in lepton-antilepton pair photoproduction from a nucleon target using real photons