# A Lattice Story of Proton Spin

## TL;DR

This paper reviews recent lattice QCD findings on proton spin components, including quark and gluon helicities and angular momenta, comparing non-perturbative results with previous perturbative calculations.

## Contribution

It provides a summary of recent lattice QCD consensus on proton spin structure and reports preliminary non-perturbative results for quark and gluon angular momentum.

## Key findings

- Lattice QCD results on quark and gluon helicities are summarized.
- Preliminary non-perturbative angular momentum results are presented.
- Comparison with previous 1-loop perturbative results is discussed.

## Abstract

In this contribution, I summarized the recent Lattice QCD consensuses on the quark helicity, plus the investigations on the gluon helicity and orbital angular momenta. The preliminary non-perturbative normalized and renormalized Ji quark and gluon angular momentum results are also reported and compared with the previous 1-loop perturbative renormalized results.