Abstract
The understanding of Quantum Chromodynamics (QCD) at large distances still remains one of the main outstanding problems of nuclear physics. Studying the internal structure of hadrons provides a way to probe QCD in the non-perturbative domain and can help us unravel the internal structure of the most elementary blocks of matter. Jefferson Lab (JLab) has already delivered results on how elementary quarks and gluons create nucleon structure and properties. The upgrade of JLab to 12 GeV will allow the full exploration of the valence-quark structure of nucleons and the extraction of real threedimensional pictures. I will present recent results and review the future experimental program at JLab.
Highlights
Quantum Chromodynamics (QCD), the theory of strong interactions, presents unique features compared to its counterpart for electromagnetic interactions, Quantum Electrodynamics (QED)
Generalized Parton Distributions (GPDs) reduce to ordinary parton distributions for ξ = 0 and t = 0, and their first moments are the form factors measured in elastic scattering (for example dx Hq(x, ξ, t) = F1q(t), for each flavor of quark q)
GPDs are precious tools to probe the structure of the nucleon and Deeply Virtual Compton Scattering (DVCS) is the golden channel to access GPDs
Summary
Quantum Chromodynamics (QCD), the theory of strong interactions, presents unique features compared to its counterpart for electromagnetic interactions, Quantum Electrodynamics (QED). The mass of quarks only account for a very small fraction of the nucleon mass, and most of it seems to come from the motion of quarks and gluons inside Through Deeply Inelastic Scattering (DIS) we can relate parton distributions functions (PDFs) to the momentum distribution of quarks and gluons. They are complementary ways with similar drawbacks. The simplest process of this type is Deeply Virtual Compton Scattering (DVCS): γ∗ p → γp, usually realized using electroproduction of real photons (ep → epγ)
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