The Drell-Hearn-Gerasimov Sum-Rule in QCD

Details The Drell-Hearn-Gerasimov Sum-Rule in QCD The Drell-Hearn-Gerasimov Sum-Rule in QCD

1997-03-06

arxiv.org/abs/hep-ph/9703254v2

Mod.Phys.Lett. A12 (1997) 1051-1068

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1142/S0217732397001072

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.

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