The Drell-Hearn-Gerasimov Sum-Rule in QCD

Abstract

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

19 pages, LaTeX, no figures; various typos fixed; to appear in Mod. Phys. Letts. A

Cited by in corpus (9)

• Dispersion relations in real and virtual Compton scattering
• Spin Physics and Polarized Structure Functions
• The Spin Structure of the Proton
• Generalized Sum Rules for Spin-Dependent Structure Functions of the Nucleon
• The Spin Structure of a Polarized Photon
• The Drell-Hearn Sum Rule at Order Alpha**3
• $Q^2$--Dependence of the Gerasimov-Drell-Hearn Sum Rule
• Polarization Asymmetry Zero in Heavy Quark Photoproduction and Leptoproduction Cross Sections
• Polarization Phenomena in Small-Angle Photoproduction of e+e- Pairs and the Gerasimov-Drell-Hearn Sum Rule