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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 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. \mu_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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Contributor : Jeanine Pellet <>
Submitted on : Thursday, March 15, 2007 - 4:02:17 PM
Last modification on : Thursday, November 19, 2020 - 12:58:48 PM

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I. A. Qattan, J. Arrington, R. E. Segel, X. Zheng, K. Aniol, et al.. Precision Rosenbluth measurement of the proton elastic form factors. Physical Review Letters, American Physical Society, 2005, 94, pp.142301. ⟨10.1103/PhysRevLett.94.142301⟩. ⟨in2p3-00136885⟩



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