Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-10-27
Nucl.Phys.A805:210-220,2008
Physics
Nuclear Physics
Nuclear Theory
prepared for Proceedings of International Nuclear Physics Conference (INPC07), typos corrected + references added
Scientific paper
10.1016/j.nuclphysa.2008.02.244
A brief overview of the recent activity in the measurement of the elastic electromagnetic proton and neutron form factors is presented. It is discussed how the quality of the data has been greatly improved by performing double polarization experiments, and the role of two-photon exchange processes will be highlighted. The spatial information on the quark charge distribibutions in the nucleon resulting from the form factors measurements will be discussed, as well as the steady rate of improvements made in the lattice QCD calculations. It is discussed how generalized parton distributions have emerged as a unifying theme in hadron physics linking the spatial densities extracted from form factors with the quark momentum distribution information residing in quark structure functions. The recent progress in the electromagnetic excitation of the $\Delta(1232)$ resonance will also briefly be discussed.
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