Zero of the proton electric form factor in the finite value of the spacelike momentum transfer squared

Abstract

The behavior of the polarization data on ${\mu }_p(G_E^p(t)/G_M^p(t))$ ratio, at the present day available up to $t=-8.5$ GeV${}^2$, obtained in the Jefferson Lab experiments carried out by the Akhiezer-Rekalo polarization method, has a decreasing tendency, indicating possible existence of a zero of the proton electric form factor $G_E^p(t)$ in the finite spacelike momentum transfer squared value. However, recently appeared two papers, investigating these data, one of them including also other existing data on the nucleon electromagnetic structure in the spacelike and timelike regions, in which an existence of such zero is disproved. Nevertheless, reinvestigations we provide in this paper give clear arguments for the possible existence of such a zero.

Comments: 15 pages, 1 figure, 2 tables