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Volume 316 - XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG1-WG6 Joint Session
Recent Spin Structure Function Measurements from CLAS at Jefferson Laboratory
R. Fersch* On behalf of the CLAS Collaboration
*corresponding author
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Pre-published on: 2018 September 20
Published on: 2018 November 23
The polarized electron accelerator at Jefferson Laboratory (JLab) in Newport News, Virginia, USA yields a robust program for the study of the spin physics of the nucleon. The CLAS detector and longitudinally polarized target in Hall-B at JLab were employed in multiple measurements of spin-structure functions for the proton and neutron in the resonance and DIS regions at beam energies of up to 6 GeV. Recently published results from the EG1 experiment present extensive measurements of the g1 and g2 structure functions for the proton over a wide kinematic range (0.05 < Q^2 < 5 GeV^2 and 1.08 < W < 3 GeV). These data, together with data from the related EG4 and EG1-DVCS experiments in Hall-B, help constrain global models of structure functions, virtual photon asymmetries, and parton helicity distributions, and provide more precise values of higher-twist matrix elements in the framework of the Operator Product Expansion.
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