Global analysis of parity-violating asymmetry data for elastic electron scattering

Abstract

We perform a statistical analysis of the full set of parity-violating asymmetry data for elastic electron scattering including the most recent high precision measurement from $Q$-weak. Given the basis of the present analysis, our estimates appear to favor non-zero vector strangeness, specifically, positive (negative) values for the electric (magnetic) strange form factors. We also provide an accurate estimate of the axial-vector nucleon form factor at zero momentum transfer, $G_A^{ep}(0)$. Our study shows $G_A^{ep}(0)$ to be importantly reduced with respect to the currently accepted value. We also find our analysis of data to be compatible with the Standard Model values for the weak charges of the proton and neutron.

6 pages, 4 figures, 2 tables. Accepted for publication in PRD

References in corpus (6)

• Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q**2=0.22 (GeV/c)**2
• The SAMPLE Experiment and Weak Nucleon Structure
• Testing the Standard Model by precision measurement of the weak charges of quarks
• Global Analysis of Nucleon Strange Form Factors at Low $Q^2$
• Nuclear isospin mixing and elastic parity-violating electron scattering
• Nuclear Structure Uncertainties in Parity-Violating Electron Scattering from Carbon 12

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