Interplay of Spin and Orbital Angular Momentum in the Proton

TL;DR

This paper explores how spin and orbital angular momentum contribute to the proton's structure, deriving implications from a specific explanation and validating results against lattice QCD and experimental data.

Contribution

It provides a detailed analysis of orbital angular momentum distribution in the proton based on the Myhrer-Thomas model, aligning theoretical predictions with experimental and lattice results.

Findings

Orbital angular momentum distributions agree with lattice QCD after QCD evolution.

Results are consistent with experimental constraints from Hermes and JLab.

The study supports the Myhrer-Thomas explanation of the proton spin problem.

Abstract

We derive the consequences of the Myhrer-Thomas explanation of the proton spin problem for the distribution of orbital angular momentum on the valence and sea quarks. After QCD evolution these results are found to be in very good agreement with both recent lattice QCD calculations and the experimental constraints from Hermes and JLab.