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We apply a hard-scattering model based on quantum-chromodynamic perturbation theory to the production of hadrons at large transverse momentum by transversely polarized beam and target protons. We find that, at large x, = 2p,/l& the spin-spin asymmetry A , for the case of transversely polarized protons is significantly smaller than the corresponding asymmetry A, for longitudinally polarized protons. This situation is due to the relatively smaller size of both the quark-quark scattering asymmetry and the spindependent distribution functions for quarks in the transversely polarized proton.

We calculate in quantum-chrome-dynamic 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.

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