A Precision Measurement of $G_E^p/G_M^p$ at BLAST

We have measured $G_{\!E}^p/G_{\!M}^p$ at $Q^2 = 0.1\mbox{--}0.9\,{\rm GeV/c}^2$ in the South Hall Ring of the MIT-Bates Linear Accelerator Facility. 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 $\vec{\rm\,H}(\vec {\rm\,e},{\rm e}'{\rm p})$ asymmetry in both sectors simultaneously, we could extract the form factor ratio independent of beam and target polarization. This was the first experiment to measure $G_{\!E}^p/G_{\!M}^p$ using a polarized target, which is complementary to recoil polarimetry experiments. Preliminary results are presented.