Helicity Amplitudes and Sum Rules for Real and Virtual Photons

Details Helicity Amplitudes and Sum Rules for Real and Virtual Photons Helicity Amplitudes and Sum Rules for Real and Virtual Photons

2000-12-13

arxiv.org/abs/nucl-th/0012045v1

Physics

Nuclear Physics

Nuclear Theory

10 pages LaTeX including 3 figures, Talk given at the GDH 2000 Conference, Mainz, June 14-17, 2000; to be published in World S

Scientific paper

Results of the recently developed unitary isobar model (MAID) are presented
for helicity amplitudes, spin asymmetries, structure functions and relevant sum
rules for real and virtual photons in the resonance region. Our evaluation of
the energy-weighted integrals is in good agreement for the proton but shows big
discrepancies for the neutron.

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