The Q^2 Dependence of the Polarized Structure Functions
A comprehensive program to measure polarized structure functions in the resonance region and beyond using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab has completed taking data.One of the experimental goals is to measure the first moment (Gamma_1) of the polarized structure function, g_1, as a function of Q^2 by scattering polarized electrons from polarized proton (NH_3) and deuteron (ND_3) targets.Deep inelastic scattering measurements obtain positive values for the first moment at large Q^2.The first moment is constrained by the Gerasimov-Drell-Hearn sum rule ^1 to have anegative slope at the photon point.The CLAS measurements encompass the transition from the low Q^2 region dominated by resonances and other non-perturbative effects to the high Q^2 region where quasi-free partons dominate the interaction.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 915215
- Report Number(s):
- JLAB-PHY-02-177; DOE/ER/40150-4332
- Country of Publication:
- United States
- Language:
- English
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