A measurement of the proton elastic form factors for 1 ≤ Q^2 ≤ 3 (GeV/c)^2

[摘要] We report measurements of the proton form factors, G^p_E and G^p_M, extractedfrom elastic electron scattering in the range 1 ≤ Q^2 ≤ 3 (GeV/c)^2 with uncertaintiesof <15% in G^p_E and <3% in G^p_M. The results for G^p_E are somewhat larger thanindicated by most theoretical parameterizations. The ratio of Pauli and Dirac formfactors, Q^2(F^p_2/F^p_1), is lower in value and demonstrates less Q^2 dependence thanthese parameterizations have indicated. Comparisons are made to theoretical models,including those based on perturbative QCD, vector-meson dominance, QCD sumrules, and diquark constituents to the proton. A global extraction of the form factors,including previous elastic scattering measurements, is also presented.

[发布机构] University:California Institute of Technology;Department:Physics, Mathematics and Astronomy

[关键词] Physics