Measurements of the electric and magnetic form factors of the proton from Q2=1.75 to 8.83 (GeV/c)2

L. Andivahis, P. E. Bosted, A. Lung, L. M. Stuart, J. Alster, R. G. Arnold, C. C. Chang, F. S. Dietrich, W. Dodge, R. Gearhart, J. Gomez, K. A. Griffioen, R. S. Hicks, C. E. Hyde-Wright, C. Keppel, S. E. Kuhn, J. Lichtenstadt, R. A. Miskimen, G. A. Peterson, G. G. PetratosS. E. Rock, S. Rokni, W. K. Sakumoto, M. Spengos, K. Swartz, Z. Szalata, L. H. Tao

Research output: Contribution to journalArticlepeer-review


The proton elastic form factors GEp(Q2) and GMp(Q2) have been extracted for Q2=1.75 to 8.83 (GeV/c)2 via a Rosenbluth separation to ep elastic cross section measurements in the angular range 13°≤θ≤90°. The Q2 range covered more than doubles that of the existing data. For Q2<4 (GeV/c)2, where the data overlap with previous measurements, the total uncertainties have been reduced to < 14% in GEp and < 1.5% in GMp. Results for GEp(Q2) are consistent with the dipole fit GD(Q2)=(1+Q2/0.71)-2, while those for GMp(Q2)/μpGD(Q2) decrease smoothly from 1.05 to 0.92. Deviations from form factor scaling are observed up to 20%. The ratio Q2F2/F1 is observed to approach a constant value for Q2>3 (GeV/c)2. Comparisons are made to vector meson dominance, dimensional scaling, QCD sum rule, diquark, and constituent quark models, none of which fully characterize all the new data.

Original languageEnglish
Pages (from-to)5491-5517
Number of pages27
JournalPhysical review D
Issue number9
StatePublished - 1994


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