The radial structure of the proton and its constituents
Understanding how quantum chromodynamics, the theory of strong interaction, works in the low-energy region, the so-called confinement region is one of the major challenges facing physicists. The structure of nucleon is one of the most active areas of research in nuclear physics addressing this challenge. In this talk, I will review recent progresses on electromagnetic form factors of the nucleon including the latest intriguing situation concern the charge radius of the proton, and new results on the strange quark contribution to the electromagnetic structure of the nucleon from parity-violation electron scattering. I will also discuss recent developments in the study of the generalized parton distribution functions which provide three-dimensional imaging of the nucleon. © 2012 American Institute of Physics.