Speaker
Description
The string-based formalism to Generalized Parton Distributions (GPDs) introduced in Phys.Rev.Lett. 133 (2024) 24, 241901 offers a unique opportunity to study the three-dimensional structure of the nucleon without any fine-tuning of parameters. Leveraging next-to-leading order PDF fits to parametrize the moments used in the conformal moment expansion of GPDs, the approach satisfies by construction all constraints from experimental data as well as Lorentz covariance, polynomiality and support constraints. In this talk I will discuss the recent extension of this formalism to axial and helicity flip GPDs discussed in 2507.18615 [hep-ph] to address the spin decomposition of the nucleon at finite skewness and, for the first time, present results on helicity singlet GPDs.