SPIN STRUCTURE OF THE NUCLEON STUDIED BY HERMES

2003 ◽  
Vol 18 (08) ◽  
pp. 1161-1168
Author(s):  
◽  
TOSHI-AKI SHIBATA
Keyword(s):  
Electron Beam ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Spin Structure ◽  
Magnetic Spectrometer ◽  
Particle Identification ◽  
Wide Acceptance ◽  
Basic Concepts ◽  
Gas Targets ◽  
Polarized Deep Inelastic Scattering

The spin structure of the proton and neutron is studied by polarized deep inelastic scattering at HERMES. The longitudinally polarized electron beam at 27.6 GeV, polarized internal gas targets of 3 He , H and D, and a wide acceptance magnetic spectrometer with a particle identification capability are the important ingredients of the experiment. The basic concepts of the measurements at HERMES as well as recent physics results are presented.

scholarly journals The Drell–Hearn–Gerasimov Sum-Rule in QCD

1997 ◽  
Vol 12 (15) ◽  
pp. 1051-1067 ◽  
Author(s):  
S. D. Bass
Keyword(s):  
Standard Model ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Magnetic Moment ◽  
Present Status ◽  
Spin Structure ◽  
Sum Rules ◽  
Sum Rule ◽  
Minimal Standard ◽  
Polarized Deep Inelastic Scattering

Photoproduction spin sum-rules offer a new window on the spin structure of the nucleon that complements the information we can learn from polarized deep inelastic scattering experiments. We review the theory and present status of the Drell–Hearn–Gerasimov sum-rule in QCD, emphasizing 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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