Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-06-25
AIP Conf.Proc.1155:125-134,2009
Physics
Nuclear Physics
Nuclear Experiment
Proceedings of the Spin Structure at Long Distance Workshop
Scientific paper
10.1063/1.3203293
JLab has been at the forefront of a program to measure the nucleon spin-dependent structure functions over a wide kinematic range, and data of unprecedented quality has been extracted in all three experimental halls. Moments of these quantities have proven to be powerful tools to test QCD sum rules and provide benchmark tests of Lattice QCD and Chiral Perturbation Theory. Precision measurements of $g_{1,2}^n$ and $g_1^p$ have been performed as part of the highly successful `extended GDH program', but data on the $g_2^p$ structure function remain scarce. We discuss here JLab experiment E08-027, which will measure quantity $g_2^p$ in the resonance region at low $Q^2$. These data will be used to test the Burkhardt-Cottingham sum rule and to extract the higher moments $\delta_{LT}^p(Q^2)$ and $\overline{d}_2^p(Q^2)$. Data in the $Q^2$ range $0.02
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