Proton elastic form factor ratios to $Q^2$ = 3.5 GeV${}^2$ by polarization transfer

Abstract

The ratio of the proton elastic electromagnetic form factors, $G_{Ep}/G_{Mp}$, was obtained by measuring $P_t$ and $P_{\ell }$, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic $\vec{e}p\to e\vec{p}$ ~reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV${}^2$. In the single-photon exchange approximation, the ratio $G_{Ep}/G_{Mp}$ is directly proportional to the ratio $P_t/P_{\ell }$. The simultaneous measurement of $P_t$ and $P_{\ell }$ in a polarimeter reduces systematic uncertainties. The results for the ratio $G_{Ep}/G_{Mp}$ 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. The data have been re-analyzed and systematic uncertainties have become significantly smaller than previously published results.

31 pages, 29 gfigures, submitted to Phys. Rev. C

References in corpus (3)

• Precision Rosenbluth measurement of the proton elastic form factors
• Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors
• Double distributions for the proton

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