[NT/RBRC seminar] Extraction of 3D hadron structure from experimental data and lattice QCD results

by Mr Zaki Panjsheeri (University of Virginia)

Wednesday 1 Jul 2026, 11:00 → 13:00 US/Eastern

CFNS library (https://bnl.zoomgov.com/j/1614715193?pwd=WkwxODVWdzZzb29zQnZRVGp3VTBDQT09)

Realistic and flexible parameterizations are a fundamental component of the extraction of generalized parton distributions from available data and future Electron-Ion Collider experiments. In this seminar, we present a spectator-model based parametrization for valence, sea, and gluon GPDs, including off-forward perturbative QCD evolution. The parameters are constrained using inclusive scattering data, lattice QCD results, and symmetry conditions. This approach, called UVA2, serves as the foundation for extending the imaging of proton structure beyond the usual one-body picture to that of multi-parton correlations. To interface GPD phenomenology more closely with the degrees of freedom of lattice QCD, we introduce a modified version of our parameterization to interpret lattice connected and disconnected contributions, which becomes especially relevant at low x. Additionally, UVA2 is used in a closure test for NNGPD, a flexible GPD parameterization within a Bayesian deep-learning framework. The challenges evident in the interfacing of GPD extractions with the presently available deeply virtual exclusive scattering data will be discussed.