Quantum-Chromodynamic Spin-Spin Asymmetries in Large-pTHadron Production with Polarized Beam and Target

We calculate in quantum-chromodynamic perturbation theory the spin-spin asymmetries for the fundamental 2→2 scattering processes involving quarks and gluons. Using simple, reasonable assumptions concerning the distribution functions for definite-helicity quarks and gluons in a spinning proton we find that the idea that large-$p_T$ events arise from the hard scattering of quarks and gluons leads to a measurable asymmetry for inclusive hadron production at large $p_T$ from a polarized beam and target.