The 3 Dimensional Structure of the Nucleon - Extracting Spin Dependent Parton Distributions from Deeply Virtual Scattering Processes
Gary Goldstein Tufts University
Host: Kamesh Wali, email@example.com | Contact: David Schaich, firstname.lastname@example.org
Spin and transverse momentum dependent parton distributions - GPDs, TMDs and GTMDs - are at the interface between the non-perturbative regime of QCD hadron structure and observable quantities. The distributions appear as linear superpositions and convolutions within helicity amplitudes for parton-nucleon scattering processes, which, in turn, occur in amplitudes for leptoproduction processes. The phenomenological extraction of the amplitudes, and hence the distributions, is a challenging task. We will present relations between crucial quark-nucleon or gluon-nucleon helicity amplitudes and the rich array of angular distributions in Deeply Virtual Compton Scattering, Time-like Compton Scattering and novel Multi-hadron photon processes. These provide an important window into the 3 dimensional momentum and spin structure of the nucleons.