Strangeness Vector and Axial-Vector Form Factors of the Nucleon

Abstract

A revised global fit of electroweak $ep$ and $\nu p$ elastic scattering data has been performed, with the goal of determining the strange quark contribution to the vector and axial-vector form factors of the nucleon in the momentum-transfer range $0<Q^2<1$ GeV${}^2$. The two vector (electric and magnetic) form factors $G_E^s(Q^2)$ and $G_M^s(Q^2)$ are strongly constrained by $ep$ elastic scattering data, while the major source of information on the axial-vector form factor $G_A^s(Q^2)$ is $\nu p$ scattering data. Combining the two kinds of data into a single global fit makes possible additional precision in the determination of these form factors, and provides a unique way to determine the strange quark contribution to the nucleon spin, $\Delta S$, independently of leptonic deep-inelastic scattering. The fit makes use of data from the BNL-E734, SAMPLE, HAPPEx, G0, and PVA4 experiments; we will also compare the result of the fit with recent data from MiniBooNE, and anticipate how this fit can be improved when new data from MicroBooNE become available.

International Nuclear Physics Conference 2013, Firenze

References in corpus (4)

• 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
• Parity-Violating Electron Scattering and the Electric and Magnetic Strange Form Factors of the Nucleon
• Determination of the strange form factors of the nucleon from $\nu p$, $\bar{\nu }p$, and parity-violating $\vec{e}p$ elastic scattering

Cited by in corpus (8)

• Flavor Structure of the Nucleon Sea
• Single photon events from neutral current interactions at MiniBooNE
• Axial-vector form factors for the low lying octet baryons in the chiral quark constituent model
• Coherent $\mu -e$ Conversion at Next-to-Leading Order
• Unravelling the physical meaning of the Jaffe-Manohar decomposition of the nucleon spin
• Global Fit of Electron and Neutrino Elastic Scattering Data to Determine the Strange Quark Contribution to the Vector and Axial Form Factors of the Nucleon
• Improving Dark Matter Searches by Measuring the Nucleon Axial Form Factor: Perspectives from MicroBooNE
• Quasi-Elastic Neutrino Reactions on Carbon and Lead Nuclei