Measurements of the electromagnetic form factor of the Proton at JLab

Details Measurements of the electromagnetic form factor of the Proton at JLab Measurements of the electromagnetic form factor of the Proton at JLab

2003-06-30

arxiv.org/abs/nucl-ex/0307001v1

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 6 figures, presented at Xth International Seminar on Electromagnetic Interactions of Nuclei at Low and Medium Energi

Scientific paper

The ratio of the proton's elastic electromagnetic form factors $G_{Ep}/G_{Mp}$ was obtained by measuring $P_{t}$ and $P_{\ell}$, the transverse and longitudinal recoil proton polarization, respectively. For the elastic reaction $\vec e p \to e\vec p$, $G_{Ep}/G_{Mp}$ is proportional to $P_t/P_{\ell}$. The simultaneous measurement of $P_{t}$ and $P_{\ell}$ in a polarimeter reduces systematic uncertainties. The results for the ratio $G_{Ep}/G_{Mp}$ measured in Hall A so far show a systematic decrease with increasing $Q^2$, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. Together these experiments cover the Q$^{2}$- range of 0.5 to 5.6 GeV$^{2}$. A new experiment is currently being prepared, to extend the Q$^2$-range to 9 GeV$^2$ in Hall C.

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