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With 10 days of running time spread over 4 energies, ratios which depend only
on GE/GM of the proton can be measured to 0.75% at three values of
Q2. We will take data at values of Q2 where Hall A polarization
transfer experiment [4] finds GE/GM 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 GE/GM=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 GE/GM, under
two different assumptions for the value of GE/GM. 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 GE/GM 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.
12/13/2000