Pion Electroproduction on the Nucleon and the Generalized GDH Sum Rule

Details Pion Electroproduction on the Nucleon and the Generalized GDH Sum Rule Pion Electroproduction on the Nucleon and the Generalized GDH Sum Rule

1999-09-28

arxiv.org/abs/nucl-th/9909068v1

Physics

Nuclear Physics

Nuclear Theory

10 pages LATEX including 5 postscript figures, Proc. of the Second Int. Conf. on Perspectives in Hadronic Physics, Trieste 199

Scientific paper

We present predictions for the spin structure functions of the proton and the neutron in the framework of a unitary isobar model for one-pion photo- and electroproduction. Our results are compared with recent experimental data from SLAC. The first moments of the calculated structure functions fulfill the Gerasimov-Drell-Hearn and Burkhardt-Cottingham sum rules within an error of typically 5-10% for the proton. For the neutron target we find much bigger deviations, in particular the sum rule for I_1(0)+I_2(0) is heavily violated.

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