Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→pElastic Scattering

A new method of obtaining the strange form factors of the nucleon is presented, in which forward-angle parity-violating $\overrightarrow{e}p$ elastic scattering data are combined with $\nu p$ and $\overline{\nu }p$ elastic scattering data to extract all three strange form factors: electric, magnetic, and axial ($G_E^s$, $G_M^s$, and $G_A^s$). In this Letter, $\nu p$ and $\overline{\nu }p$ data from the Brookhaven E734 experiment are combined with the Jefferson Laboratory HAPPEX $\overrightarrow{e}p$ data to obtain two distinct solutions for the strange form factors at $Q^2=0.5{\mathrm{G}\mathrm{e}\mathrm{V}}^2$. More generally, combining the neutrino elastic scattering data from E734 with the existing and upcoming $\overrightarrow{e}p$ data will yield the strange form factors of the nucleon for $Q^2$ of $0.45–1.05{\mathrm{G}\mathrm{e}\mathrm{V}}^2$. Measurement of $G_A^s$ is crucial to the determination of the strange quark contribution to the nucleon spin $\Delta s$.