New Measurements of the Proton Double-Spin Asymmetries $A_1$ and $A_2$ In and Above the Resonance Region

ORAL

Abstract

The CLAS (CEBAF Large Acceptance Spectrometer) EG1b experiment in Hall-B at Jefferson Laboratory utilized a polarized electron beam at various (1.6, 2.5, 4.2, 5.6 GeV) energies and polarized frozen NH$_3$ and ND$_3$ targets to measure target and double-polarization asymmetries of inclusive and exclusive electron-nucleon scattering events. The polarized proton double-spin asymmetries $A_1$ (for $0.05$ GeV$^2 < Q^2 < 4.0$ GeV$^2$) and $A_2$ (for $0.15$ GeV$^2 < Q^2 < 2.0$ GeV$^2$) have been extracted from a combined analysis of the data at the four beam energies. Preliminary results for $A_1$ and $A_2$ in the specified ranges will be shown.

Authors

  • Robert Fersch

    College of William and Mary