Precision Rosenbluth measurement of the proton elastic form factors
Abstract
We report the results of a new Rosenbluth measurement of the proton form factors at Q2 values of 2.64, 3.20 and 4.10 GeV2. Cross sections were determined by detecting the recoiling proton in contrast to previous measurements in which the scattered electron was detected. At each Q2, relative cross sections were determined to better than 1%. The measurement focussed on the extraction of GE/GM which was determined to 4-8% and found to approximate form factor scaling, i.e. μp GE ≈ GM. These results are consistent with and much more precise than previous Rosenbluth extractions. However, they are inconsistent with recent polarization transfer measurements of comparable precision, implying a systematic difference between the two techniques.
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