Next-to-leading order hadronic single-spin production of polarized prompt photons

We present a calculation of the complete next-to-leading order [O(α${\mathrm{\alpha }}_{\mathit{s}}^2$)] corrections to the inclusive production of polarized prompt photons in collisions of longitudinally polarized hadrons with unpolarized hadrons. We show that this process should offer a good possibility of deciding between presently suggested proton spin scenarios and shows good perturbative stability. Furthermore, we also estimate the effect of the leading order fragmentation contribution and discuss its influence on the cross section asymmetries.