Single Spin Asymmetries in Proton-Proton and Proton-Neutron Scattering at 820 GeV

The physics case is summarised for the investigation of high energy spin phenomena by placing an internal polarised target into HERA’s unpolarised proton beam. The luminosity and experimental sensitivity are discussed. Estimating the physics reach of single spin asymmetries in different final states reveals a considerable physics potential in testing the spin sector of perturbative QCD.