Three experiments at JLab have measured the double polarization asymmetries A_‖(x,Q~2) in the nucleon resonance region, using polarized electron beams incident on polarized proton and deuteron targets. The analysis for the first experiment, egla in Hall B, is nearly finished and preliminary vaules of the spin structure function g_1(x,Q~2) and the first moment Γ_1 (x) have been extracted. The other two experiments, one in Hall B and one in Hall C, are still analysing data. Some results are presented.
展开▼
