Date Awarded


Document Type


Degree Name

Doctor of Philosophy (Ph.D.)




Keith A Griffioen


Experiment E155 at the Stanford Linear Accelerator Center measured the longitudinal and transverse polarized deep-inelastic scattering asymmetries for the proton and deuteron using longitudinally-polarized electron beams with energies of 48.3 GeV and 38.8 GeV, respectively. The electron beam polarization was measured by Moller polarimetry to be 0.81 +/- 0.02. Dynamically-polarized solid 15N3 and 6Li2H were used as the target materials. The scattered electrons were detected in three independent spectrometers at 2.75??, 5.5??, and 10.5??, covering a kinematic range of 0.014 ≤ x ≤ 0.9 and 1.0(GeV/ c)2 ≤ Q2 ≤ 40(GeV/ c)2. The 10.5?? spectrometer was constructed for this experiment. The structure functions gp1 and gd1 were extracted from the asymmetry data, and, in combination with world data, were fit in next-to-leading order perturbative QCD. The Q 2 dependence of g1 differed slightly from that of F1. The g1 results are consistent with the Bjorken sum rule. The structure functions gp2 and gd2 were extracted from the asymmetry data, and were used to extract the twist-3 reduced matrix elements dp2,dd2 , and dn2 .



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