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We present a detailed phenomenological study of photoproduction of twohadrons, both with high transverse momentum, in longitudinally polarizedlepton-nucleon collisions. We consistently include ``direct'' and ``resolved''photon contributions and examine the sensitivity of the relevant spinasymmetries to the gluon polarization in the nucleon and to the completelyunknown parton content of circularly polarized photons. Our results arerelevant for the COMPASS and HERMES fixed-target experiments as well as for apossible future polarized lepton-proton collider like eRHIC at BNL. So far, allstudies are limited to the lowest order approximation of QCD.Comment: 10 pages, 9 eps figure

Hadron-pair photoproduction in longitudinally polarized lepton–nucleon collisions