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Published June 1, 1994 | Published
Journal Article Open

Measurements of the proton elastic form factors for 1≤Q^2≤3 (GeV/c)^2 at SLAC

Walker, R. C.
Filippone, B. W. ORCID icon
Jourdan, J.
Milner, R.
McKeown, R.
Potterveld, D.
Andivahis, L.
Arnold, R.
Benton, D.
Bosted, P.
deChambrier, G.
Lung, A.
Rock, S. E.
Szalata, Z. M.
Para, A.
Dietrich, F.
Van Bibber, K.
Button-Shafer, J.
Debebe, B.
Hicks, R. S.
Dasu, S.
de Barbaro, P.
Bodek, A.
Harada, H.
Krasny, M. W.
Lang, K.
Riordan, E. M.
Gearhart, R.
Whitlow, L. W.
Alster, J.

Abstract

We report measurements of the proton form factors GEp and GMp extracted from elastic scattering in the range 1≤Q^2≤3 (GeV/c)^2 with total uncertainties < 15% in GEp and < 3% in GMp. Comparisons are made to theoretical models, including those based on perturbative QCD, vector-meson dominance, QCD sum rules, and diquark constituents in the proton. The results for GEp are somewhat larger than indicated by most theoretical parametrizations, and the ratios of the Pauli and Dirac form factors Q^2(F2p / F1p) are lower in value and demonstrate a weaker Q^2 dependence than those predictions. A global extraction of the elastic form factors from several experiments in the range 0.1 0.1

Additional Information

© 1994 American Physical Society. Received 4 November 1993. We would like to thank B. Richter, R. Eisele, C. Hudspeth, G. Davis, J. Mark, M. Starek, J. Nicol, A. Sill, and the SLAC management and staff for their assistance in this experiment. This research was supported by National Science Foundation Grant Nos. PHY85-05682 and PHY84-10549 and Department of Energy Contract Nos. DE-AC02-76ER13065, DE-AC02-76ER02853, DE-AC03-76F00515, W-7405-ENG-48, and the US-Israel Binational Science Foundation.

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