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

doi:10.1103/physrevlett.94.142301

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Precision Rosenbluth measurement of the proton elastic form factors

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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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