1. General Seminars

The 3D structure of the nucleon

by Dr Harut Avagyan (Jefferson Lab)

Aula Edificio 22 (Laboratori Nazionali di Frascati)

Aula Edificio 22

Laboratori Nazionali di Frascati

Harut Avakian Thomas Jefferson National Accelerator Facility, 12000 Jefferson Ave., Newport News, VA 23601, USA Due to immense progress in recent years in theoretical and experimental studies of the transverse structure of the nucleon one is starting to understand transverse parton motion not as a random uniform distribution, but rather as naturally correlated with the parton and nucleon spins. The 3D structure of the nucleon is encoded in transverse momentum distribution (TMD) functions describing partonic distributions for different combinations of spins of partons and nucleons, and Generalized Parton Distributions (GPDs) describing spatial distributions of partons. The measurement and understanding of these functions (including the Collins and Sivers functions, and GPD E) are of world-wide interest, with experimental programs at BELLE, COMPASS, RHIC, and future facilities such as EIC and GSI. In the area of deep inelastic semi-inclusive and hard exclusive scattering, the JLab12 program will be completely dominant for the foreseeable future. Several proposals were approved by JLab PAC to study TMDs and GPDs in different processes involving semi-inclusive and exclusive pion and kaon production with CLAS12 using unpolarized and polarized hydrogen and deuteron targets. In this talk we present an overview of the latest developments in studies of TMDs and GPDs and future measurements, focused on the JLab12 program.