Conclusions

With 10 days of running time spread over 4 energies, ratios which depend only on G_E/G_M of the proton can be measured to $\sim$0.75% at three values of Q². We will take data at values of Q² where Hall A polarization transfer experiment [4] finds G_E/G_M to be significantly less then unity. At the two lower Q² points which overlap the published polarization transfer results the difference between the assumption of G_E/G_M=1 and the reported polarization transfer leads to a 7% difference in the ratio we will measure, almost ten times our expected uncertainty. Figure 5 shows the projected uncertainties on the extracted value of G_E/G_M, under two different assumptions for the value of G_E/G_M. The projected uncertainties are significantly smaller than from previous L-T measurements, while for the Q²=1.45 and 3.20 GeV² points, where published polarization transfer data exists, the projected uncertainty is comparable to or smaller then the Hall A measurement. At Q²=4.9, the uncertainty on G_E/G_M is starting to become large, but the value as taken from the fit to the Hall A data is still almost 6 standard deviations from unity.