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Proton electric to magnetic form factor ratio from spin-dependent electron scattering from polarized internal hydrogen gas target

Recently a new measurement of proton electric to magnetic form factor ratio, G E G M at Q= 0.1 0.9 (GeV/c) in the South Hall Ring of the MIT-Bates Linear Accelerator Facility from polarized electron-proton elastic scattering was completed. This experiment used a polarized electron beam, a pure hydrogen internal polarized target, and the symmetric Bates Large Acceptance Spectrometer Toroid (BLAST) detector. By measuring the spin-dependent elastic ep elastic scattering asymmetry in both sectors simultaneously, we can extract the form factor ratio independent of beam and target polarization. This is the