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Precision Rosenbluth measurement of the proton elastic form factors

I. A. Qattan·J. Arrington·R. E. Segel·X. Zheng·K. Aniol·O. K. Baker·R. Beams·E. J. Brash·J. Calarco·A. Camsonne·J. -P. Chen·M. E. Christy·D. Dutta·R. Ent·S. Frullani·D. Gaskell·O. Gayou·R. Gilman·C. Glashausser·K. Hafidi·J. -O. Hansen·D. W. Higinbotham·W. Hinton·R. J. Holt·G. M. Huber·H. Ibrahim·L. Jisonna·M. K. Jones·C. E. Keppel·E. Kinney·G. J. Kumbartzki·A. Lung·D. J. Margaziotis·K. McCormick·D. Meekins·R. Michaels·P. Monaghan·P. Moussiegt·L. Pentchev·C. Perdrisat·V. Punjabi·R. Ransome·J. Reinhold·B. Reitz·A. Saha·A. Sarty·E. C. Schulte·K. Slifer·P. Solvignon·V. Sulkosky·K. Wijesooriya·B. Zeidman
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Abstract

We report the results of a new Rosenbluth measurement of the proton form factors at Q^2 values of 2.64, 3.20 and 4.10 GeV^2. Cross sections were determined by detecting the recoiling proton in contrast to previous measurements in which the scattered electron was detected. At each Q^2, relative cross sections were determined to better than 1%. The measurement focussed on the extraction of G_E/G_M which was determined to 4-8% and found to approximate form factor scaling, i.e. μ_p G_E \approx G_M. 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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I. A. Qattan, J. Arrington, R. E. Segel, X. Zheng, K. Aniol, O. K. Baker, R. Beams, E. J. Brash, J. Calarco, A. Camsonne, J. -P. Chen, M. E. Christy, D. Dutta, R. Ent, S. Frullani, D. Gaskell, O. Gayou, R. Gilman, C. Glashausser, K. Hafidi, J. -O. Hansen, D. W. Higinbotham, W. Hinton, R. J. Holt, G. M. Huber, H. Ibrahim, L. Jisonna, M. K. Jones, C. E. Keppel, E. Kinney, G. J. Kumbartzki, A. Lung, D. J. Margaziotis, K. McCormick, D. Meekins, R. Michaels, P. Monaghan, P. Moussiegt, L. Pentchev, C. Perdrisat, V. Punjabi, R. Ransome, J. Reinhold, B. Reitz, A. Saha, A. Sarty, E. C. Schulte, K. Slifer, P. Solvignon, V. Sulkosky, K. Wijesooriya, B. Zeidman. 2004-10-08. Precision Rosenbluth measurement of the proton elastic form factors. https://doi.org/10.1103/physrevlett.94.142301

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