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29 March 2024
 
  » arxiv » nucl-th/0005061

 Article overview


Pion electroproduction on the nucleon and the generalized GDH sum rule
L. Tiator ; D. Drechsel ; S.S. Kamalov ;
Date 23 May 2000
Subject nucl-th hep-ph
AffiliationUniversitaet Mainz) and S.S. Kamalov (JINR Dubna
AbstractResults of the recently developed unitary isobar model (MAID) are presented for the spin asymmetries, structure functions and relevant sum rules in the resonance region. The model describes the presently available data for single-pion photo- and electroproduction in the resonance region below Wcm = 2 GeV very well. It is based on Born terms and resonance contributions, and the respective multipoles are constructed in a gauge-invariant and unitary way for each partial wave. The eta production is included in a similar way, while the contribution of more-pion and higher channels is modeled by comparison with the total cross sections and simple phenomenological assumptions. Our evaluation of the energy-weighted integrals is in good agreement for the proton but shows big discrepancies for the neutron.
Source arXiv, nucl-th/0005061
Other source [GID 1045499] nucl-th/9909068
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