Helicity Parton Distributions at a Future Electron-Ion Collider: A   Quantitative Appraisal
  We present a quantitative assessment of the impact a future electron-ion collider will have on determinations of helicity quark and gluon densities and their contributions to the proton spin. Our results are obtained by performing a series of global QCD analyses at next-to-leading order accuracy based on realistic sets of pseudo-data for the inclusive and semi-inclusive deep-inelastic scattering of longitudinally polarized electrons and protons at different, conceivable center-of-mass system energies. 
Elke C. Aschenauer, Rodolfo Sassot, Marco Stratmann
hep-ph