New Measurements of the Proton Spin-Structure Functions $g_1$ and $g_2$ in and above the Resonance Region

The CLAS (CEBAF Large Acceptance Spectrometer) EG1b experiment in Hall-B at Jefferson Laboratory measured double-spin inclusive and exclusive electron-nucleon scattering asymmetries using longitudinally polarized frozen NH$_3$ and ND$_3$ targets and a longitudinally polarized electron beam at 4 different energies (1.6, 2.5, 4.2, 5.6 GeV). Extraction of the virtual photon asymmetry $A_1$ (for $0.05$ GeV$^2 < Q^2 < 4.0$ GeV$^2$) provides precision measurements of the polarized spin-structure function $g_1$ in and above the resonance region. Linear regression of data between the varying energies yields new constraints on the virtual photon asymmetry $A_2$ (and thus the structure function $g_2$) in the resonance region (for $0.3$ GeV$^2 < Q^2 < 1.0$ GeV$^2$). Measurements of these structure functions and their moments allows testing of QCD models, sum rules, foward-spin polarizability and duality for the proton.