Next-to-leading order QCD corrections to inclusive hadron photoproduction in polarized lepton proton collisions

We calculate the next-to-leading order QCD corrections to the \direct" part of the spindependent cross section for single-inclusive charged-hadron photoproduction. This process could be studied experimentally in future polarized xed-target lepton-nucleon experiments, but also at the HERA ep collider after an upgrade to both beams being polarized. We present a brief numerical evaluation of our results by studying the K-factors and the scale dependence of the NLO cross section.