We solve for the light-front wave functions of the nucleon from a light-front quantum chromodynamics (QCD) effective Hamiltonian with three-dimensional confinement. We obtain solutions using constituent three quarks combined with three quarks and one gluon Fock components. The resulting light-front wave functions provide a good quality description of the nucleon's quark distribution functions following QCD scale evolution. We present the effects from incorporating a dynamical gluon on the nucleon's gluon densities, helicity distribution and orbital angular momentum that constitutes the nucleon spin sum rule.
@article{arxiv.2209.08584,
title = {Nucleon spin decomposition with one dynamical gluon},
author = {Siqi Xu and Chandan Mondal and Xingbo Zhao and Yang Li and James P. Vary},
journal= {arXiv preprint arXiv:2209.08584},
year = {2024}
}