13,501 research outputs found
Introduction: GDH and related topics
The formulation of the Gerasimov-Drell-Hearn sum rule is revisited, showing
its connection with other sum rules occurring in electron scattering and
discussing the problem of its saturation, both from the theoretical and
experimental point of v iew. The generalisation to other nuclear targets is
also reported.Comment: 9 pages, talk given at GDH2002 conferenc
Systematic study of longitudinal and transverse helicity amplitudes in the hypercentral Constituent Quark Model
The predictions of the hypercentral Consituent Quark Model for the nucleon
helicity amplitudes are briefly reported. Some future perspectives are also
discussed
A relativistic study of the nucleon form factors
We perform a calculation of the relativistic corrections to the
electromagnetic elastic form factors of the nucleon obtained with various
Constituent Quark Models. With respect to the non relativistic calculations a
substantial improvement is obtained up to Q^2 about 2 (GeV/c)^2.Comment: 10 pages, 6 figures (1a,1b,1c,2a,2b,2c), to be published on Z. Phys.
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