Transverse Structure of Hadrons

TL;DR

This paper explores the transverse structure of hadrons through impact parameter space distributions, revealing significant deformations linked to polarization and their implications for single-spin asymmetries and quark-gluon correlations.

Contribution

It introduces the impact parameter space approach to GPDs, highlighting polarization-dependent deformations and their connection to observable asymmetries and correlations.

Findings

Impact parameter distributions show significant transverse polarization effects.

Deformations relate to single-spin asymmetries and quark-gluon correlations.

DVCS amplitude information is summarized by GPDs along the diagonal and D-form factor.

Abstract

Parton distributions in impact parameter space, which are obtained by Fourier transforming GPDs, exhibit a significant deviation from axial symmetry when the target and/or quark are transversely polarized. Connections between this deformation and single-spin asymmetries as well as with quark-gluon correlations are discussed. The information content of the DVCS amplitude at fixed $Q^2$ can be condensed into GPDs along the `diagonal' $x=\xi$ plus D-form factor.