Precise determination of low-Q nucleon electromagnetic form factors and their impact on parity-violating e-p elastic scattering

Abstract

The extraction of the strangeness form factors from parity violating elastic electron-proton scattering is sensitive to the electromagnetic form factors at low Q^2. We provide parameterizations for the form factors and uncertainties, including the effects of two-photon exchange corrections to the extracted EM form factors. We study effect of the correlations between different form factors, in particular as they impact the parity violating asymmetry and the extraction of the strangeness form factors. We provide a prescription to extract the strangeness form factors from the asymmetry that provides an excellent approximation of the full two-photon correction. The corrected form factors are also appropriate as input for other low-Q analyses, although the effects of correlations and two-photon exchange corrections may be different.

9 pages, 4 figures, to be submitted to Phys. Rev. C

References in corpus (6)

• Nucleon electromagnetic form factors
• Measurement of the proton electric to magnetic form factor ratio from \vec ^1H(\vec e, e'p)
• The SAMPLE Experiment and Weak Nucleon Structure
• Box diagram in the elastic electron-proton scattering
• Extraction of the Neutron Magnetic Form Factor from Quasi-Elastic 3He(pol)(e(pol),e') at Q^2 = 0.1 - 0.6 (GeV/c)^2
• Isospin violation in the vector form factors of the nucleon

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• A measurement of two-photon exchange in Super-Rosenbluth separations with positron beams