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Measurement of the proton electric to magnetic form factor ratio from vec ¹H(vec e, e'p)

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arxiv nucl-ex/0609007 v1 pith:KOM7IFNF submitted 2006-09-07 nucl-ex

Measurement of the proton electric to magnetic form factor ratio from vec ¹H(vec e, e'p)

C.B. Crawford , A. Sindile , T. Akdogan , R. Alarcon , W. Bertozzi , E. Booth , T. Botto , J. Calarco
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B. Clasie A. DeGrush T.W. Donnelly K. Dow D. Dutta M. Farkhondeh R. Fatemi O. Filoti W. Franklin H. Gao E. Geis S. Gilad W. Haeberli D. Hasell W. Hersman M. Holtrop P. Karpius M. Kohl H. Kolster T. Lee A. Maschinot J. Matthews K. McIlhany N. Meitanis R.G. Milner J. Rapaport R.P. Redwine J. Seely A. Shinozaki S. Sirca E. Six T. Smith B. Tonguc C. Tschalaer E. Tsentalovich W. Turchinetz J.F.J. van den Brand J. van der Laan F. Wang T. Wise Y. Xiao W. Xu C. Zhang Z. Zhou V. Ziskin T. Zwart
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We report the first precision measurement of the proton electric to magnetic form factor ratio from spin-dependent elastic scattering of longitudinally polarized electrons from a polarized hydrogen internal gas target. The measurement was performed at the MIT-Bates South Hall Ring over a range of four-momentum transfer squared $Q^2$ from 0.15 to 0.65 (GeV/c)$^2$. Significantly improved results on the proton electric and magnetic form factors are obtained in combination with previous cross-section data on elastic electron-proton scattering in the same $Q^2$ region.

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Cited by 2 Pith papers

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  1. Implications of exclusive photon leptoproduction measurements for the proton charge-radius puzzle

    hep-ph 2026-07 conditional novelty 5.0

    After excluding or cutting low-|t| CLAS 2018 data, BH-dominated EP measurements yield a proton charge radius smaller than the PDG average and consistent with PRad and muonic hydrogen.

  2. Electromagnetic form factors of the nucleon from the instanton vacuum

    hep-ph 2026-05 unverdicted novelty 5.0

    Nucleon EM form factors computed in instanton vacuum model with parameters fixed by saddle-point equation yield proton charge radius 0.841 fm matching muonic hydrogen and good agreement on Q2 dependence of ratios.