An extensive experimental program to measure the spin structure of the nucleon has been carried out in in Hall B at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). Using a longitudinally polarized beam scattering off longitudinally polarized NH3 and ND3 targets, the double spin asymmetry A∥ was measured over a large range in Q2 and W, providing data of impressive high precision that will give a better understanding of the structure of the nucleon in the Deep Inelastic Scattering and the valence quarks regions. Using a world data parameterization of A2 and F1, the virtual photon asymmetry A1 and the structure function g1 were extracted in a Q2 range from 0.05 to 5 GeV2 and a W range from 1.08 to 3.0 GeV. As a result of the extended kinematical range, first moments of structure functions were measured over a large range in Q2 and duality was tested. Finally, using the large kinematical overlap of different beam energies, A2 was extracted.
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Copyright 2009 AIP Publishing
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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Biselli, A., & CLAS Collaboration. (2009, December). Precision Spin Structure Functions for the Proton and Deuteron with CLAS. AIP Conference Proceedings Vol. 1182, No. 1, pp. 589-592 and may be found at https://doi.org/10.1063/1.3293877.