Abstract
Since the R. Hofstadter pioneering experiments in the '50s, the measurements of the electromagnetic space-like nucleon form factors (FF's) have been a precious source of information for the understanding of the internal structure of the nucleons.
Highlights
IntroductionThe nucleon (proton or neutron) has an internal, spatially extended, structure [1, 2]
The nucleon has an internal, spatially extended, structure [1, 2]
JLab, with its upgraded 12 GeV polarized, high intensity, electron beam combined to new targets and readout equipments, will offer unprecedented opportunities to extend the current proton and neutron form factors (FF’s) measurements to higher momentum transfer Q2 and to improve statistical and uncertainties at lower Q2, where the nucleon size can be accurately investigated
Summary
The nucleon (proton or neutron) has an internal, spatially extended, structure [1, 2]. EPJ Web of Conferences where E(r) and M (r) are the spatial charge and magnetization density distributions respectively, q is the 3-momentum transfer In this context, the nucleon electromagnetic current is described, in one photon exchange approximation, by the Dirac (F1) and Pauli (F2) scalar FF’s which are linear combinations of the Sachs FF’s. Rosenbluth separation: the traditional method dominating the first 30 years of measurements; in one photon exchange approximation, the unpolarized e-p reduced elastic cross section is basically proportional to the Sachs FF’s d r /d = G2E(Q2) + G2M (Q2) with the kinematic variables = 1/ 1 + 2(1 + ) tan ( e/2) and = Q2/(4M2), being e the electron scattering angle and M the mass of the nucleon. Of the recoil nucleon. 3D−H→oeu(bel,eepno)lathriezabteioanm:-staimrgielatralsyytmo mtheetrpyolAar,iaztatfiiorsnt transfer, in elastic approximation, is polarized scattering −→H
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