Deeply Virtual Compton Scattering experiment at Jefferson Lab Hall B , with CLAS12, large acceptance spectrometer.
Goals:
Theoretical concepts as Generalized Parton Distributions (GPD), enable to probe with a dramatic accuracy the nucleon structure, and access the quark confinement in hadrons.
Objectives
Study of deeply virtual Compton scattering (DVCS) at Jefferson Lab, at 6 GeV, as part of the general program to determine generalized parton distributions (GPD) in the nucleon.
Recent theoretical advances resulted in the definition of these new distributions, which yield a much more complete information about the way quarks and gluons are distributed within nucleons (and within all hadrons): 3D holography, quark orbital angular momentum...
The COMPASS experiment (Common Muon and Proton Aparatus for Structure and Spectroscopy) is a particle physics experiment on the hadron and muon beam from the SPS accelerator at CERN, close to Geneva. Several physics topics are adressed:
Nucleon structure in quarks and gluons, in which the DPhN is particlarly involved.
Hadron electromagnetic form factors parametrize the internal structure of hadrons, the dynamical distribution of magnetization and charge created by the inner constituents.
They are considered fundamental quantities as they are a privileged background for interplay between theory and experiment.
La nature de ces nouvelles fonctions
Des progrès théoriques importants survenus dans les cinq dernières années permettent d'étendre considérablement la notion de distributions de partons dans un nucléon ou un méson.
