# Strange Nucleon Form Factors from $ep$ and $\nu p$ Elastic Scattering

## TL;DR

This paper analyzes recent experimental data from electron and neutrino scattering to extract the strange quark contributions to nucleon form factors, revealing configurations different from traditional models and proposing future experiments for improved understanding.

## Contribution

It provides a novel interpretation of strangeness in the nucleon based on combined scattering data and discusses future experiments to enhance precision and explore nucleon spin contributions.

## Key findings

- Strangeness contributions to nucleon form factors have been extracted from combined $ep$ and $
u p$ data.
- Results suggest configurations different from kaon-loop models.
- Future experiments aim to measure strangeness effects at lower $Q^2$ with higher precision.

## Abstract

The recent parity-violating $ep$ forward-scattering elastic asymmetry data from Jefferson Lab (HAPPEx and G0), when combined with the $\nu p$ elastic cross section data from Brookhaven (E734), permit an extraction of the strangeness contribution to the vector and axial nucleon form factors for momentum transfers in the range $0.45 < Q^2 < 1.0$ GeV$^2$. These results, combined with the recent determination of the strange vector form factors at $Q^2 = 0.1$ GeV$^2$ (SAMPLE, HAPPEx, PVA4, G0) have been interpreted in terms of $uuds\bar{s}$ configurations very different from the kaon-loop configurations usually associated with strangeness in the nucleon. New experiments are being proposed to improve the state of our knowledge of the $\nu p$ elastic cross section -- these new experiments will push the range of $Q^2$ to much lower values, and greatly increase the precision of the $\nu p$ elastic data. One outcome of this can be a measurement of the strangeness contribution to the nucleon spin, $\Delta s$. Nuclear targets (e.g. C or Ar) are to be used in these neutrino experiments, and so a deep understanding of the nuclear physics, particularly in regard to final state effects, is needed before the potential of these precision experiments can be fully realized.