Monopole and quadrupole contributions to the angular momentum density

Understand

The energy-momentum tensor form factors contain a wealth of information about the nucleon.

• It is insightful to visualize this information in terms of 3D or 2D densities related by Fourier transformations to the form factors.
• The densities associated with the angular momentum distribution were recently shown to receive monopole and quadrupole contributions.
• We show that these two contributions are uniquely related to each other.