The physics of the gravitational form factors of the proton, as well as their understanding
within quantum chromodynamics, has advanced significantly in the past two decades …

The general question, crucial to an understanding of the internal structure of the nucleon, of
how to split the total angular momentum of a photon or gluon into spin and orbital …

This work reviews the recent developments in the field of generalized parton distributions
(GPDs) and deeply virtual Compton scattering in the valence region, which aim at extracting …

The physics case for quarkonium-production studies accessible at the US Electron Ion
Collider is described.

We review the present understanding of the spin structure of protons and neutrons, the
fundamental building blocks of nuclei collectively known as nucleons. The field of nucleon …

We discuss in detail the spatial distribution of angular momentum inside the nucleon. We
show that the discrepancies between different definitions originate from terms that integrate …

Is gauge-invariant complete decomposition of the nucleon spin possible? Although it is a
difficult theoretical question which has not reached a complete consensus yet, a general …

We report the first lattice QCD calculation of the glue spin in the nucleon. The lattice
calculation is carried out with valence overlap fermions on 2+ 1 flavor domain-wall fermion …

All elementary particles in nature can be classified as fermions with half-integer spin and
bosons with integer spin. Within quantum electrodynamics (QED), even though the spin of …

A bstract The decomposition of the nucleon spin into that of quarks and gluons is related to
twist-two GPDs according to Ji sum rule. Further decomposition into the helicity and the …