SPIN EFFECTS IN LARGE-TRANSVERSE-MOMENTUM EXCLUSIVE SCATTERING PROCESSES

Nucleon-nucleon scattering at large momentum transfer is analyzed within the framework of quantum-chromodynamic quark and gluon interactions. The spin dependence of the hadronic amplitude is found to be particularly sensitive to the underlying dynamical mechanisms. Detailed discussions of the quark-intercharge and Landshoff pinch-singularity contributions are given for large-angle pp, np, and pp̄ elastic scattering. A possible explanation is given for the large spin-spin correlations measured by Crabb et al. We also define a new SU(2) symmetry group, H spin, which generalizes conventional helicity, and is an exact symmetry of the quark-intercharge process. © 1979 The American Physical Society.