THE DRELL-HEARN-GERASIMOV SUM-RULE IN QCD

Photoproduction spin sum-rules offer a new window on the spin structur e of the nucleon that complements the information we can learn from po larized deep inelastic scattering experiments. We review the theory an d present status of the Drell-Hearn-Gerasimov sum-rule in QCD, emphasi zing the possible relation between the present ''discrepancy'' in this sum-rule and the nucleon's strangeness magnetic moment. In the case o f an elementary electron or photon target (say at the NLC) the Drell-H earn-Gerasimov sum-rule provides a test for physics beyond the minimal Standard Model.